KITLG and Skin Color
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KITLG and Human Skin Color
KITLG, also known as KIT ligand, stem cell factor (SCF), or historically the Steel factor, is an important signaling molecule involved in the development and maintenance of pigment-producing melanocytes. Research across human genetics, developmental biology, evolutionary genetics, dermatology, and comparative animal studies shows that variation in the KITLG pathway can influence skin pigmentation, hair pigmentation, melanocyte numbers, and patterns of pigmentation.
KITLG does not act as a simple "skin color gene." Human pigmentation is highly polygenic, with many genes contributing to differences in melanin production, melanosome biology, melanocyte signaling, and the response of the skin to environmental factors such as ultraviolet radiation. KITLG is one component of this larger biological system.
Its importance is especially notable because many influential KITLG variants appear to alter when, where, or how strongly the gene is expressed rather than changing the structure of the KITLG protein itself. This makes KITLG an important example of how changes in gene regulation can contribute to visible evolutionary differences among populations.
KITLG and Melanocyte Biology
KITLG produces a signaling molecule that binds to the KIT receptor on melanocytes and their precursor cells. The KITLG-KIT pathway is involved in melanocyte survival, proliferation, migration, adhesion, differentiation, and maintenance.
Melanocytes originate from neural crest-derived precursor cells during development. Experimental studies show that KIT signaling is particularly important as these precursor cells migrate through developing tissues and establish melanocyte populations in the skin and hair follicles. When KITLG or KIT signaling is disrupted, melanocyte numbers can be reduced, producing areas of decreased pigmentation or complete depigmentation.
KITLG can exist in soluble and membrane-bound forms. These forms appear to perform somewhat different biological functions. Soluble KITLG can promote melanoblast movement, while membrane-bound KITLG can provide a local survival signal that helps maintain melanocytes in particular tissue environments.
Research in cultured melanocytes and experimental animals has repeatedly shown that increasing KITLG signaling can increase melanocyte activity or pigmentation, while inhibition of KIT signaling can reduce melanocyte survival and pigment production.
KITLG, Melanin, and Skin Pigmentation
The amount and distribution of melanin in the epidermis depend not only on enzymes that directly manufacture pigment but also on the number, activity, and organization of melanocytes. KITLG affects pigmentation partly through its control of these melanocyte populations.
Human studies involving recombinant stem cell factor demonstrated that increased SCF exposure can cause localized hyperpigmentation accompanied by increased melanocyte numbers, greater melanocyte dendricity, and increased epidermal melanin.
KITLG signaling also interacts with important pigmentation regulators including MITF. Activation of KIT can stimulate intracellular signaling pathways that influence MITF and melanogenic enzymes such as tyrosinase. These interactions help connect extracellular signals from surrounding skin cells to the molecular machinery that produces pigment.
Keratinocytes, fibroblasts, endothelial cells, and other cells within the skin can produce signals affecting melanocytes. KITLG is therefore part of a broader communication network between melanocytes and the surrounding epidermal and dermal environment.
Ultraviolet Radiation and KITLG Signaling
Ultraviolet radiation can influence the KITLG-KIT pathway. Experimental studies show that UV exposure can increase stem cell factor production in skin-associated cells and increase expression of the KIT receptor in melanocytes.
This provides one mechanism through which environmental exposure can alter pigmentation. Increased SCF/KIT signaling following ultraviolet exposure can stimulate melanocyte activity and contribute to tanning or other forms of increased epidermal pigmentation.
Studies of UV-exposed endothelial cells have also shown that cells beneath the epidermis can release stem cell factor and stimulate pigmentation, demonstrating that the tanning response involves communication among multiple cell types rather than melanocytes acting independently.
Abnormal regulation of this system has also been associated with hyperpigmented conditions such as melasma and solar lentigines.
KITLG and the Evolution of Human Skin Color
KITLG became particularly important in research on human pigmentation evolution after genetic studies identified strong evidence of natural selection near the gene.
Research comparing humans with threespine stickleback fish provided an influential example of parallel pigmentation evolution. Regulatory changes affecting Kit ligand expression contributed to pigmentation differences among stickleback populations, while genetic variation near human KITLG was associated with pigmentation differences and showed evidence of strong natural selection.
The importance of this research was not that fish and humans developed identical pigmentation, but that regulatory changes affecting the same signaling gene could repeatedly become targets of natural selection in very different vertebrate lineages.
Human population studies have detected considerable geographic differentiation around KITLG. Selection signals have been reported particularly in European and East Asian populations. This is significant because Europeans and East Asians evolved lighter average pigmentation partly through different combinations of genetic variants. KITLG is one of the loci that provides evidence for the complex and partially convergent evolutionary history of human pigmentation.
Population-genetic studies also suggest that selection affecting KITLG may have occurred relatively early compared with some other well-known European light-pigmentation variants.
Regulatory Evolution
One of the most important lessons from KITLG research is the evolutionary significance of regulatory DNA.
A mutation does not need to alter a protein's amino-acid sequence to have an important biological effect. Variants in enhancers and other regulatory elements can modify how strongly a gene is expressed, when it is activated, or in which tissues it functions.
This principle is demonstrated especially clearly by the KITLG enhancer associated with blond hair in some European populations. A regulatory variant near KITLG alters enhancer activity and contributes to blond hair without changing the KITLG protein itself.
Other regulatory regions near KITLG show evidence of natural selection and population differentiation. Together, these findings demonstrate how relatively subtle changes in gene regulation can modify pigmentation while preserving the many other essential biological functions performed by KITLG.
This is particularly important because KITLG is pleiotropic: it participates not only in pigmentation but also in other developmental and cellular processes. Regulatory changes can potentially alter pigmentation in a specific tissue while reducing the broader biological consequences that might result from disrupting the entire gene.
KITLG, Hair Color, and Other Pigmentation Traits
KITLG influences more than skin pigmentation. Variants near the gene have also been associated with hair color, including classic blond hair in Europeans.
Experimental studies show that SCF-KIT signaling is important for the normal pigmentation of mammalian hair follicles. The pathway contributes to the maintenance and activity of melanocytes that produce pigment during the hair-growth cycle.
Animal studies provide additional examples. Regulatory and structural variation near KITLG has been associated with pigment intensity in dogs, roan coat patterns in several livestock species, iris pigmentation in pigs, pigmentation changes in mice, and pigment-cell development in fish.
The recurrence of KITLG-related pigmentation phenotypes across vertebrates indicates that the pathway is evolutionarily ancient and highly conserved.
KITLG Mutations and Human Pigmentary Disorders
Rare mutations in KITLG demonstrate particularly clearly how strongly the pathway can influence human pigmentation.
Gain-of-function KITLG mutations have been identified in families with familial progressive hyperpigmentation. Other KITLG mutations can cause familial progressive hyper- and hypopigmentation, in which darker and lighter regions of skin occur together.
Additional variants have been associated with generalized hypopigmentation and, in some cases, sensorineural hearing loss. These disorders demonstrate that changing KITLG function can influence melanocyte development and activity throughout the body.
The range of clinical presentations also illustrates an important genetic principle: different mutations in the same gene can produce very different effects depending on where the mutation occurs and how it changes protein function or receptor interaction.
KIT, Piebaldism, and the KITLG Pathway
The receptor for KITLG is encoded by the KIT gene. Mutations in KIT are a major cause of human piebaldism, a congenital condition characterized by sharply defined areas lacking normal pigmentation.
Research beginning in the early 1990s established that KIT mutations can prevent melanocytes from properly migrating, surviving, or proliferating during development.
Different KIT mutations produce a wide spectrum of pigmentation effects. Some individuals have relatively limited patches of depigmentation, while others develop extensive white areas. Certain mutations can also produce café-au-lait-like hyperpigmented macules or other complex pigmentation patterns.
These disorders provide strong evidence that the KITLG-KIT signaling system controls the establishment and maintenance of normal melanocyte populations.
Comparative Evidence from Animals
Much of what is known about KITLG biology originated from animal genetics.
The mouse Steel locus was eventually identified with Kit ligand. Mutations affecting this locus can cause pale or altered coat pigmentation together with other developmental effects. Experimental changes in epidermal Kitl expression can dramatically alter the number and distribution of melanocytes.
Zebrafish and medaka studies similarly demonstrate that Kit ligand signaling affects melanophore development, migration, survival, and regeneration.
Domestic animals provide additional natural experiments. KITLG-associated variants or nearby structural changes have been linked to pigmentation phenotypes in dogs, goats, alpacas, pigs, cattle, and other mammals.
These findings show that evolutionary and artificial selection can repeatedly modify pigmentation through the KITLG pathway.
KITLG Within the Genetics of Human Pigmentation
Human skin color is the product of many interacting genes rather than one dominant pigmentation locus.
Studies across African, European, East Asian, South Asian, Latin American, and admixed populations have identified numerous pigmentation-associated loci. Important pathways regulate melanin synthesis, melanosome formation and transport, melanocyte development, cellular signaling, and responses to ultraviolet radiation.
The genetic combinations producing similar pigmentation levels can therefore differ substantially between populations.
Research on African populations has been particularly important in demonstrating the extraordinary genetic diversity underlying human pigmentation. These findings challenge simplified models in which skin pigmentation can be reduced to a small set of "light" and "dark" alleles.
KITLG should therefore be understood as one part of a highly polygenic and evolutionarily complex pigmentation system.
Evolution, Environment, and Pleiotropy
Natural selection on pigmentation is closely connected to environmental conditions, especially variation in ultraviolet radiation. Human populations moving into different geographic environments encountered different combinations of UV exposure, climate, diet, and other ecological conditions.
KITLG is especially interesting because some research suggests that selective pressures acting on the locus may involve traits beyond pigmentation. One study of Eurasian populations proposed that KITLG variation might reflect both pigmentation and adaptation associated with winter temperature.
Other research has identified KITLG regulatory variants connected to cellular pathways such as p53, illustrating the gene's broader biological importance.
Because KITLG has many functions, evolutionary changes at this locus may involve trade-offs and multiple selective pressures rather than pigmentation alone.
Conclusion
KITLG is an important component of the biological system controlling human pigmentation. Through its interaction with the KIT receptor, it helps regulate melanocyte development, migration, survival, proliferation, and activity.
Human genetic studies show that variation around KITLG has been shaped by natural selection and has contributed to pigmentation differences among populations. Regulatory variants demonstrate how evolution can alter gene expression without changing the underlying protein, allowing pigmentation to change while preserving other essential functions.
Rare KITLG mutations and KIT-associated disorders provide additional evidence of the pathway's importance, while experiments in mice, fish, dogs, livestock, and other animals demonstrate that its pigmentation functions are deeply conserved across vertebrate evolution.
At the same time, KITLG represents only one part of the much larger genetic architecture of human pigmentation. Skin color evolved through interactions among many genes, environmental pressures, population histories, migration, and natural selection. The study of KITLG therefore provides both a specific explanation for one pigmentation pathway and a broader example of how regulatory evolution can contribute to visible human diversity.
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Human Pigmentation Genetics, Evolution, and Adaptation
The Genetic Architecture of Human Skin Pigmentation: Evolution and Adaptation across Global Populations
| Bose et al. | Frontiers in Genetics | 2026
Integrates modern GWAS, population genetics, ancient DNA and evolutionary studies of pigmentation, including KITLG within the polygenic architecture of skin-color adaptation.
Prediction of Skin Color Using Forensic DNA Phenotyping in Asian Populations: A Focus on Thailand
| Multiple authors | Biomolecules | 2025
Reviews genetic skin-color prediction in Asian populations and includes KITLG among important pigmentation loci relevant to East and Southeast Asian variation.
The Genetics and Evolution of Human Pigmentation
| Multiple authors | Biology | 2025
Reviews pigmentation genes, UV adaptation, convergent evolution, and population-specific genetic pathways underlying global skin-color diversity.
Skin Colour: A Window into Human Phenotypic Evolution and Environmental Adaptation
| Jiuming Liu, Habtom K. Bitsue and Zhaohui Yang | Molecular Ecology | 2024
Reviews 26 pigmentation genes and specifically identifies KITLG as an important contributor to the evolution of skin pigmentation in East Asian populations.
Identifying Signatures of Positive Selection in Human Populations from North Africa
| Multiple authors | Scientific Reports | 2023
Detects selection patterns in North African populations and includes KITLG among loci useful for understanding shared and region-specific Eurasian-African adaptation.
Evolutionary Genetics of Skin Pigmentation in African Populations
| Yuanqing Feng, Michael A. McQuillan and Sarah A. Tishkoff | Human Molecular Genetics | 2021
Reviews the exceptionally diverse genetic architecture of African pigmentation and provides a useful counterpoint to Eurasian KITLG selection.
The Evolution of Human Skin Pigmentation Involved the Interactions of Genetic, Environmental, and Cultural Variables
| Nina G. Jablonski | Pigment Cell & Melanoma Research | 2021
Synthesizes evolutionary evidence and discusses KITLG among pigmentation changes affecting ancestors and descendants of Eurasian populations.
Skin Colour and Vitamin D: An Update
| Andrea Hanel and Carsten Carlberg | Experimental Dermatology | 2020
Reviews pigmentation genetics and vitamin D biology and discusses KITLG among loci contributing to human pigmentation differences.
The Evolutionary History of Human Skin Pigmentation
| Jorge Rocha | Journal of Molecular Evolution | 2020
Reviews the complex evolutionary history of skin color and argues that geographic pigmentation reflects several forms of natural selection rather than a few simple selective sweeps.
A GWAS in Latin Americans Highlights the Convergent Evolution of Lighter Skin Pigmentation in Eurasia
| Kaustubh Adhikari et al. | Nature Communications | 2019
Demonstrates the polygenic architecture of pigmentation in admixed Latin Americans and provides comparative evidence for independent routes toward lighter pigmentation.
The Genetics of Human Skin and Hair Pigmentation
| Elizabeth E. Quillen et al. | Annual Review of Genomics and Human Genetics | 2019
Comprehensive review of pigmentation genetics that places KITLG alongside melanogenic enzymes, signaling genes, transport proteins, GWAS loci, and evolutionary adaptations.
HIrisPlex-S System for Eye, Hair, and Skin Color Prediction from DNA: Massively Parallel Sequencing Solutions
| Kristen Breslin et al. | Forensic Science International: Genetics | 2019
Adapts pigmentation prediction markers to high-throughput sequencing and demonstrates the practical use of polygenic pigmentation information.
Meta-Analysis of GWA Studies Provides New Insights on the Genetic Architecture of Skin Pigmentation in Recently Admixed Populations
| Multiple authors | BMC Genetics | 2019
Combines data from Cuban, Cape Verdean, Puerto Rican, and African-American populations to identify genetic regions influencing quantitative skin pigmentation.
Darwinian Positive Selection on the Pleiotropic Effects of KITLG Explain Skin Pigmentation and Winter Temperature Adaptation in Eurasians
| Zhen-Dong Yang et al. | Molecular Biology and Evolution | 2018
Examines KITLG variants in Han Chinese and reports associations between several KITLG SNPs and skin lightness while proposing that selection may also reflect adaptation to cold environments.
The HIrisPlex-S System for Eye, Hair and Skin Colour Prediction from DNA
| Lakshmi Chaitanya et al. | Forensic Science International: Genetics | 2018
Introduces a validated DNA system combining numerous pigmentation variants to predict human eye, hair, and skin color simultaneously.
Loci Associated with Skin Pigmentation Identified in African Populations
| Nicholas G. Crawford et al. | Science | 2017
Reveals the extensive genetic diversity underlying African skin pigmentation and provides a major comparison with KITLG-centered selection in Eurasian populations.
Global Skin Colour Prediction from DNA
| Susan Walsh et al. | Human Genetics | 2017
Develops a DNA-based model for predicting human skin pigmentation and illustrates the polygenic architecture within which KITLG contributes to pigmentation variation.
Adaptation of Human Skin Color in Various Populations
| Deng and Xu | Hereditas | 2017
Summarizes pigmentation adaptation across modern and ancient populations and compares the genetic pathways producing similar skin-color phenotypes.
Identification of a Novel Locus Associated with Skin Colour in African-Admixed Populations
| Multiple authors | Scientific Reports | 2017
Uses Puerto Rican and African-American samples to identify pigmentation associations beyond the best-known European pigmentation alleles.
An Unexpectedly Complex Architecture for Skin Pigmentation in Africans
| Alicia R. Martin et al. | Cell | 2017
Discusses the extensive genetic diversity underlying African pigmentation and shows that skin color cannot be explained by a simple light-versus-dark genetic model.
Basis for the Gain and Subsequent Dilution of Epidermal Pigmentation during Human Evolution
| Peter M. Elias and Mary L. Williams | American Journal of Physical Anthropology | 2016
Explores alternative evolutionary pressures that may have contributed to both the development of strongly pigmented skin and later depigmentation.
A Hidden Markov Model for Investigating Recent Positive Selection through Haplotype Structure
| Hua Chen, Jody Hey and Montgomery Slatkin | Theoretical Population Biology | 2015
Applies haplotype modeling to KITLG and other selected human genes to estimate the age and strength of recent positive selection.
The Genetics of Skin, Hair, and Eye Color Variation and Its Relevance to Forensic Pigmentation Predictive Tests
| Christopher Phillips et al. | Forensic Science International: Genetics | 2015
Reviews pigmentation-associated SNPs and explains how genetic variants influencing melanogenesis can be used to predict externally visible pigmentation.
A Molecular Basis for Classic Blond Hair Color in Europeans
| Catherine A. Guenther et al. | Nature Genetics | 2014
Demonstrates that rs12821256 in a KITLG regulatory enhancer changes transcriptional activity and contributes to blond hair without altering KITLG protein sequence.
Selection, p53, and Pigmentation
| Margret H. Ogmundsdottir and Eirikur Steingrimsson | Pigment Cell & Melanoma Research | 2014
Commentary connecting natural selection, p53 regulation, KITLG expression, pigmentation biology, and the pleiotropic consequences of variation at this locus.
The Timing of Pigmentation Lightening in Europeans
| Sandra Beleza et al. | Molecular Biology and Evolution | 2013
Uses population-genetic evidence to estimate when pigmentation alleles rose in frequency and suggests selection around KITLG predates several other major European light-pigmentation variants.
A Polymorphic p53 Response Element in KIT Ligand Influences Cancer Risk and Has Undergone Natural Selection
| Jorge Zeron-Medina et al. | Cell | 2013
Identifies a functional regulatory polymorphism affecting p53 control of KITLG and demonstrates that the region has experienced natural selection.
Association of Melanogenesis Genes with Skin Color Variation among Japanese Females
| Yukiko Abe et al. | Journal of Dermatological Science | 2013
Tests pigmentation genes in Japanese women and helps place KITLG-related East Asian pigmentation within a broader melanogenesis-gene framework.
The HIrisPlex System for Simultaneous Prediction of Hair and Eye Colour from DNA
| Susan Walsh et al. | Forensic Science International: Genetics | 2013
Establishes a precursor to later skin-color prediction systems and provides useful comparative information about shared pigmentation pathways.
Genetic Architecture of Skin and Eye Color in an African-European Admixed Population
| Sandra Beleza et al. | PLOS Genetics | 2013
Studies quantitatively measured pigmentation in Cape Verde and shows how ancestry and multiple loci combine to produce continuous skin-color variation.
Human Pigmentation Genes under Environmental Selection
| Richard A. Sturm and David L. Duffy | Genome Biology | 2012
Reviews pigmentation evolution and discusses KITLG rs642742, regulatory selection around the locus, melanocyte number, and geographically differentiated pigmentation.
Genome-Wide Association Studies of Quantitatively Measured Skin, Hair, and Eye Pigmentation in Four European Populations
| Ellen E. Quillen et al. | PLOS ONE | 2012
Uses objective reflectance and spectroscopy measurements to identify genetic influences on pigmentation across several European populations.
Understanding the Evolution of Human Pigmentation: Recent Contributions from Population Genetics
| Jonathan L. Rees and Rosalind M. Harding | Journal of Investigative Dermatology | 2012
Reviews population-genetic evidence showing that natural selection has repeatedly acted on pigmentation pathways in different human populations.
Current Opportunities and Challenges: Genome-Wide Association Studies on Pigmentation and Skin Cancer
| Jiali Han et al. | Pigment Cell & Melanoma Research | 2012
Reviews advances in pigmentation GWAS, pathway analysis, meta-analysis, and genetic risk prediction.
Contrasting Signals of Positive Selection in Genes Involved in Human Skin-Color Variation from Tests Based on SNP Scans and Resequencing
| Johanna Maria de Gruijter et al. | Investigative Genetics | 2011
Resequences KITLG and other pigmentation genes across populations and shows how conclusions about selection can differ depending on the statistical method and genetic data used.
Model-Based Prediction of Human Hair Color Using DNA Variants
| Branicki et al. | Human Genetics | 2011
Shows how combinations of pigmentation alleles can predict blond, brown, black, and red hair and illustrates the strongly polygenic nature of pigmentation.
Unpacking Human Evolution to Find the Genetic Determinants of Human Skin Pigmentation
| Ellen E. Quillen and Mark D. Shriver | Journal of Investigative Dermatology | 2011
Discusses how evolutionary genetics, admixture, and quantitative pigmentation studies can reveal the genes responsible for normal skin-color variation.
Association of the OCA2 Polymorphism His615Arg with Melanin Content in East Asian Populations
| Melissa Edwards et al. | PLOS Genetics | 2010
Examines East Asian skin-pigmentation evolution and discusses KITLG among pigmentation loci displaying evidence of selection.
Human Skin Pigmentation as an Adaptation to UV Radiation
| Nina G. Jablonski and George Chaplin | National Academies Press | 2010
Explains the ultraviolet-selection framework within which KITLG and other pigmentation alleles evolved as humans dispersed into environments with different UV regimes.
Genetic Determinants of Hair and Eye Colours in the Scottish and Danish Populations
| Mengel-From et al. | BMC Genetics | 2010
Examines pigmentation-associated variants in northern European populations and provides comparative evidence about genes influencing visible pigmentation traits.
Genome-Wide Association Studies of Pigmentation and Skin Cancer: A Review and Meta-Analysis
| Jiali Han et al. | Pigment Cell & Melanoma Research | 2010
Reviews pigmentation GWAS and connects pigmentation-associated genetic variation with melanoma and other skin-cancer susceptibility loci.
The Role of Geography in Human Adaptation
| Graham Coop et al. | PLOS Genetics | 2009
Examines geographic patterns of recent natural selection and provides broader evolutionary context for strongly differentiated pigmentation loci.
Signals of Recent Positive Selection in a Worldwide Sample of Human Populations
| Joseph K. Pickrell et al. | Genome Research | 2009
Uses worldwide genomic data to identify population-specific selective sweeps and provides context for interpreting adaptive pigmentation variants.
A Pigment Evolution Kitlg
| Emma R. Greenhill and Robert N. Kelsh | Pigment Cell & Melanoma Research | 2008
Discusses the evolutionary importance of KITLG regulatory variation and the striking parallels between pigmentation evolution in sticklebacks and humans.
A Genome-Wide Association Study Identifies Novel Alleles Associated with Hair Color and Skin Pigmentation
| Jiali Han et al. | PLOS Genetics | 2008
Provides a broad GWAS framework for human pigmentation variation useful for comparing KITLG effects with other pigmentation genes and pathways.
Two Newly Identified Genetic Determinants of Pigmentation in Europeans
| Patrick Sulem et al. | Nature Genetics | 2008
Identifies additional pigmentation-associated loci in Europeans and expands the genomic framework for understanding variation in skin, hair, and eye color.
Cis-Regulatory Changes in Kit Ligand Expression and Parallel Evolution of Pigmentation in Sticklebacks and Humans
| Craig T. Miller et al. | Cell | 2007
A landmark study linking regulatory variation near KITLG to reduced pigmentation in sticklebacks and to human skin-color variation, with strong selection signals in Europeans and East Asians.
Localizing Recent Adaptive Evolution in the Human Genome
| Scott H. Williamson et al. | PLOS Genetics | 2007
Genome-wide selection scans identified KITLG among loci showing evidence of strong recent positive selection, particularly in European and East Asian populations.
Signatures of Positive Selection in Genes Associated with Human Skin Pigmentation as Revealed from Analyses of Single Nucleotide Polymorphisms
| Oscar Lao et al. | Annals of Human Genetics | 2007
Reports population differentiation and extended haplotype evidence consistent with positive selection on KITLG in both European and Asian populations.
Genetic Determinants of Hair, Eye and Skin Pigmentation in Europeans
| Patrick Sulem et al. | Nature Genetics | 2007
Large European pigmentation GWAS identifying multiple pigmentation loci, including a variant near KITLG associated particularly strongly with hair color.
A Genomewide Association Study of Skin Pigmentation in a South Asian Population
| Renee P. Stokowski et al. | American Journal of Human Genetics | 2007
Landmark South Asian pigmentation GWAS showing the polygenic nature of skin color and providing an important comparison with KITLG-associated variation in other populations.
Genetic Evidence for the Convergent Evolution of Light Skin in Europeans and East Asians
| Heather L. Norton et al. | Molecular Biology and Evolution | 2007
Demonstrates that lighter pigmentation evolved partly through different genetic pathways in Europe and East Asia, an important context for shared selection signals around KITLG.
Human Pigmentation Variation: Evolution, Genetic Basis, and Implications for Public Health
| Esteban J. Parra | American Journal of Physical Anthropology | 2007
Reviews how natural selection generated unusually strong geographic differentiation in pigmentation genes and discusses the growing evidence for multiple adaptive loci.
Identifying Genes Underlying Skin Pigmentation Differences among Human Populations
| Sean Myles et al. | Human Genetics | 2007
Compares allele-frequency differentiation in pigmentation genes among African, European, and East Asian populations to identify candidate loci affected by natural selection.
The Evolution of Human Skin and Skin Color
| Nina G. Jablonski | Annual Review of Anthropology | 2004
Provides the evolutionary framework of UV exposure, folate protection, vitamin D requirements, and geographic selection necessary for interpreting KITLG pigmentation evolution.
KITLG / SCF / KIT Melanocyte Biology and Signaling
Therapeutic Modulation of KIT Ligand in Melanocytic Disorders with Implications for Mast Cell Diseases
| Multiple authors | Experimental Dermatology | 2024
Reviews KITLG/KIT as a therapeutic target in vitiligo, melasma, hair greying, melanoma and other disorders involving melanocyte survival or activation.
Postnatal Expression of Kitl Affects Pigmentation of the Epidermis
| Hitomi Aoki et al. | Journal of Investigative Dermatology | 2024
Uses inducible Kitl expression in mice to demonstrate that KIT ligand can influence epidermal melanocyte populations and pigmentation after birth.
Assessment of Stem Cell Factor Expression and Its c-KIT Receptor in Patients with Vitiligo
| Multiple authors | Postepy Dermatologii i Alergologii | 2022
Reports altered SCF and KIT expression in vitiligo lesions, suggesting disruption of ligand-receptor signaling contributes to melanocyte dysfunction and depigmentation.
Stem Cell Factor-Inducible MITF-M Expression in Therapeutics for Acquired Skin Hyperpigmentation
| Multiple authors | Theranostics | 2020
Shows that SCF/KIT signaling stimulates new MITF-M expression and that KIT inhibition can reduce UVB-induced pigmentation experimentally.
The Role of Stem Cell Factor in Hyperpigmented Skin Lesions
| Multiple authors | Asian Pacific Journal of Cancer Prevention | 2019
Finds increased SCF expression in melasma, solar lentigines, freckles, and some pigmented tumors, supporting the pathway's broad involvement in hyperpigmentation.
Ultraviolet-Irradiated Endothelial Cells Secrete Stem Cell Factor and Induce Epidermal Pigmentation
| Misun Kim et al. | Scientific Reports | 2018
Shows that UV-exposed endothelial cells release SCF and increase pigmentation, revealing a dermal vascular contribution to KITLG-mediated skin darkening.
Signaling Cascades Activated by UVB in Human Melanocytes Lead to Increased Expression of Endothelin B Receptor and c-KIT
| Shuko Terazawa and Genji Imokawa | Photochemistry and Photobiology | 2018
Describes how UVB sensitizes melanocytes to paracrine pigmentation signals partly through increased KIT receptor expression.
Silencing Stem Cell Factor Gene in Fibroblasts to Regulate Paracrine Factor Productions and Enhance c-Kit Expression in Melanocytes on Melanogenesis
| Multiple authors | International Journal of Molecular Sciences | 2018
Investigates how altered fibroblast SCF expression changes melanocyte signaling and melanogenesis, particularly following UVB exposure.
Withaferin A Abolishes the Stem Cell Factor-Stimulated Pigmentation of Human Epidermal Equivalents
| Shuko Terazawa et al. | Archives of Dermatological Research | 2015
Demonstrates that blocking KIT autophosphorylation interrupts downstream RAF-MEK-ERK-MITF signaling and markedly reduces SCF-induced pigmentation.
Prevention of Hair Graying by Factors That Promote the Growth and Differentiation of Melanocytes
| Multiple authors | Journal of Dermatology | 2014
Shows experimentally that Kitl expression can preserve melanocyte populations and reduce experimentally induced hair graying in mice.
Abrogating Effect of N-Linked Carbohydrate Modifiers on the Stem Cell Factor and Endothelin-1-Stimulated Epidermal Pigmentation
| Yuki Wakabayashi, Hiroaki Nakajima and Genji Imokawa | Journal of Dermatological Science | 2013
Uses human epidermal equivalents to investigate pigmentation induced by combined SCF and endothelin signaling.
Abrogating Effect of a Xanthophyll Carotenoid Astaxanthin on the Stem Cell Factor-Induced Stimulation of Human Epidermal Pigmentation
| Hiroaki Nakajima et al. | Archives of Dermatological Research | 2012
Uses reconstructed human epidermis to demonstrate that SCF strongly induces melanogenic genes, proteins, and visible pigmentation.
Membrane-Bound Kit Ligand Regulates Melanocyte Adhesion and Survival, Providing Physical Interaction with an Intraepithelial Niche
| Tabone-Eglinger et al. | FASEB Journal | 2012
Demonstrates that membrane-bound KITLG supports melanocyte positioning and survival, illustrating why regulatory changes can affect pigmentation without changing the protein sequence.
Stem Cell Factor Receptor/c-Kit: From Basic Science to Clinical Implications
| Lennart Rönnstrand | Physiological Reviews | 2012
Comprehensive review of KIT receptor signaling, including its essential roles in pigmentation, melanocyte biology, development, and human disease.
A Single UVB Exposure Increases Expression of Functional KIT in Human Melanocytes by Up-Regulating MITF through p38/CREB
| Mizutani et al. | Archives of Dermatological Research | 2010
Shows that UVB enhances KIT expression in melanocytes, strengthening responsiveness to KITLG during tanning and UV-induced pigmentation.
Allele-Specific Genetic Interactions between Mitf and Kit Affect Melanocyte Development
| Bin Wen et al. | Pigment Cell & Melanoma Research | 2010
Shows that particular MITF and KIT alleles interact genetically, illustrating how pigmentation phenotypes can depend on combinations of pathway variants.
Melanocytes in Development and Cancer
| Audrey Uong and Leonard I. Zon | Journal of Cellular Physiology | 2010
Reviews melanocyte developmental pathways including KIT signaling and explains how developmental mechanisms can be reused during melanoma formation.
Stem Cell Factor-KIT Signalling Plays a Pivotal Role in Regulating Pigmentation in Mammalian Hair
| Akira Hachiya et al. | Journal of Pathology | 2009
Shows that disrupting KIT signaling reduces MITF, tyrosinase, and hair pigmentation and demonstrates a major role for SCF-KIT in human and mouse hair melanogenesis.
Production of the Soluble Form of KIT, s-KIT, Abolishes Stem Cell Factor-Induced Melanogenesis in Human Melanocytes
| Shinya Kasamatsu et al. | Journal of Investigative Dermatology | 2008
Demonstrates that soluble KIT can act as a decoy receptor and suppress SCF-induced melanogenesis, revealing an additional level of KITLG pathway regulation.
Melanocytes in Development, Regeneration, and Cancer
| Richard M. White and Leonard I. Zon | Cell Stem Cell | 2008
Connects embryonic melanocyte specification, adult melanocyte stem cells, regeneration, pigmentation, and melanoma biology.
The Dermal Stem Cell Factor and c-kit Are Overexpressed in Melasma
| Hee Young Kang et al. | British Journal of Dermatology | 2006
Shows increased SCF and KIT expression in melasma lesions, implicating dermal-epidermal KITLG signaling in acquired human hyperpigmentation.
Less Keratinocyte-Derived Factors Related to More Keratinocyte Apoptosis in Depigmented Epidermis May Cause Passive Melanocyte Death in Vitiligo
| Ai-Young Lee et al. | Journal of Investigative Dermatology | 2005
Links reduced keratinocyte production of survival signals including SCF with loss of melanocytes in vitiligo lesions.
The Epidermal Stem Cell Factor Is Over-Expressed in Lentigo Senilis: Implication for the Mechanism of Hyperpigmentation
| Akira Hattori et al. | Journal of Investigative Dermatology | 2004
Finds increased SCF expression in solar lentigines, supporting a direct role for KITLG signaling in age- and UV-associated hyperpigmentation.
Autocrine and Paracrine Regulation of Melanocytes in Human Skin and in Pigmentary Disorders
| Genji Imokawa | Pigment Cell Research | 2004
Reviews SCF/KIT and other communication networks through which keratinocytes and fibroblasts regulate melanocyte survival and pigmentation.
Long-Distance Cue from Emerging Dermis Stimulates Neural Crest Melanoblast Migration
| Kathryn W. Tosney | Developmental Dynamics | 2004
Investigates developmental signals directing melanoblast migration into the skin and provides context for the KITLG-controlled migration pathway.
The Role of Kit-Ligand in Melanocyte Development and Epidermal Homeostasis
| Bernhard Wehrle-Haller | Pigment Cell Research | 2003
Foundational review describing KITLG, also called stem cell factor, as a major regulator of melanocyte survival, proliferation, migration, development, and adult epidermal homeostasis.
The Mechanism of Epidermal Hyperpigmentation in Café-au-Lait Macules of Neurofibromatosis Type 1 May Be Associated with Dermal Fibroblast-Derived Stem Cell Factor and Hepatocyte Growth Factor
| M. Okazaki et al. | British Journal of Dermatology | 2003
Finds evidence that increased fibroblast-derived SCF and HGF contribute to melanocyte activation in café-au-lait macules.
Vasoactive Intestinal Peptide and Cytokines Enhance Stem Cell Factor Production from Epidermal Keratinocytes DJM-1
| Maki Kakurai et al. | Journal of Investigative Dermatology | 2002
Demonstrates that keratinocytes can increase SCF production in response to inflammatory signals, providing a mechanism for environmental regulation of melanocytes.
Fibronectin Combined with Stem Cell Factor Plays an Important Role in Melanocyte Proliferation, Differentiation and Migration
| Nagako Takano et al. | Pigment Cell Research | 2002
Demonstrates that extracellular matrix signals and SCF cooperate to regulate melanocyte development from neural crest cells.
The Paracrine Role of Stem Cell Factor/c-kit Signaling in the Activation of Human Melanocytes in Ultraviolet-B-Induced Pigmentation
| Akira Hachiya et al. | Journal of Investigative Dermatology | 2001
Demonstrates that UVB increases SCF/KIT signaling and that blocking KIT can abolish UVB-induced pigmentation in an experimental model.
Review: Melanocyte Migration and Survival Controlled by SCF/c-kit Expression
| Takahiro Kunisada et al. | Journal of Investigative Dermatology Symposium Proceedings | 2001
Reviews developmental experiments demonstrating that spatial and temporal KITLG expression controls melanocyte migration and survival.
Implication of Stem Cell Factor in the Proliferation of Choroidal Melanocytes
| F. Mouriaux et al. | Experimental Eye Research | 2001
Demonstrates functional KIT expression in ocular melanocytes and investigates SCF-dependent melanocyte proliferation.
Signaling and Transcriptional Regulation in the Neural Crest-Derived Melanocyte Lineage: Interactions between KIT and MITF
| Ling Hou et al. | Development | 2000
Demonstrates that KIT signaling interacts with MITF to regulate melanocyte differentiation and expression of pigment-producing genes.
MGF (KIT Ligand) Is a Chemokinetic Factor for Melanoblast Migration into Hair Follicles
| Multiple authors | Developmental Biology | 2000
Shows that KITLG increases melanoblast movement and helps melanocytes populate developing hair follicles.
The SCF/KIT Pathway Plays a Critical Role in the Control of Normal Human Melanocyte Homeostasis
| James M. Grichnik et al. | Journal of Investigative Dermatology | 1998
Shows that SCF increases melanocyte number, size, proliferation, dendricity, and differentiation, whereas KIT inhibition causes melanocyte depletion.
MAP Kinase Links the Transcription Factor Microphthalmia to c-Kit Signalling in Melanocytes
| Timothy J. Hemesath et al. | Nature | 1998
Establishes a biochemical connection between KIT activation, MAP kinase, MITF phosphorylation, and activation of pigmentation genes such as tyrosinase.
Transgene Expression of Steel Factor in the Basal Layer of Epidermis Promotes Survival, Proliferation, Differentiation and Migration of Melanocyte Precursors
| Takahiro Kunisada et al. | Development | 1998
Demonstrates that changing the spatial expression of KIT ligand alters melanocyte development and epidermal colonization.
Autocrine Regulation of Neural Crest Cell Development by Steel Factor
| C. S. Guo et al. | Developmental Biology | 1997
Investigates Steel factor signaling in neural crest cells and its role in establishing the melanocyte lineage.
Melanocyte Development In Vivo and in Neural Crest Cell Cultures: Crucial Dependence on the Mitf Transcription Factor
| Multiple authors | Development | 1997
Shows that MITF and KIT are functionally interconnected during the transition from melanocyte precursors to differentiated pigment cells.
Stem Cell Factor Regulates the Melanocyte Cytoskeleton
| Glynis Scott, H. Liang and D. Luthra | Pigment Cell Research | 1996
Demonstrates that SCF alters melanocyte cytoskeletal organization and focal adhesion signaling, mechanisms important for cell movement and epidermal pigment organization.
Recombinant Human Stem Cell Factor (Kit Ligand) Promotes Human Mast Cell and Melanocyte Hyperplasia and Functional Activation In Vivo
| Costa et al. | Journal of Experimental Medicine | 1996
Reports persistent hyperpigmentation and increased epidermal melanization after recombinant SCF treatment, providing direct evidence that KITLG can increase pigmentation in humans.
Human Recombinant Stem-Cell Factor Induces Melanocytic Hyperplasia in Susceptible Patients
| James M. Grichnik et al. | Journal of the American Academy of Dermatology | 1995
Human administration of SCF produced localized hyperpigmentation, increased melanocyte numbers, greater dendricity, and increased melanin, directly demonstrating its pigmentation effect in vivo.
Soluble and Cell-Bound Forms of Steel Factor Activity Play Distinct Roles in Melanocyte Precursor Dispersal and Survival
| Bernhard Wehrle-Haller and James A. Weston | Development | 1995
Shows that soluble KITLG facilitates melanoblast dispersal while membrane-bound KITLG is particularly important for their subsequent survival.
Stem Cell Factor Regulates Human Melanocyte-Matrix Interactions
| Glynis Scott et al. | Pigment Cell Research | 1994
Shows that SCF/KIT signaling affects human melanocyte adhesion and migration, helping explain how KITLG regulates melanocyte distribution in skin.
Inhibition of Proliferation of Human Melanocytes by a KIT Antisense Oligodeoxynucleotide
| Richard A. Spritz et al. | Journal of Investigative Dermatology | 1994
Experimentally demonstrates that reducing KIT expression inhibits human melanocyte proliferation, helping explain pigmentation loss in KIT-related disorders.
The Kit-Ligand (Steel Factor) and Its Receptor c-kit/W: Pleiotropic Roles in Gametogenesis and Melanogenesis
| Peter Besmer et al. | Development | 1993
Reviews the developmental biology of KITLG-KIT signaling, emphasizing its essential role in melanoblast development, migration, survival, and pigmentation.
From White Spots to Stem Cells: The Role of the Kit Receptor in Mammalian Development
| Richard A. Fleischman | Trends in Genetics | 1993
Reviews genetic evidence from humans and mice showing how KIT and Steel factor control melanocyte proliferation, migration, and survival.
KIT Ligand Inhibits the Growth of KIT-Expressing Melanoma Cells
| R. Zakut et al. | Oncogene | 1993
Finds that KITLG can produce different biological responses in transformed melanocytes than in normal melanocytes, including growth inhibition.
The c-kit Receptor, Stem Cell Factor, and Mast Cells: What Each Is Teaching Us about the Others
| Stephen J. Galli et al. | American Journal of Pathology | 1993
Reviews the discovery of the KIT-SCF system from white-spotted mouse mutants and its importance for melanocyte migration and development.
The Kit Ligand Encoded at the Murine Steel Locus: A Pleiotropic Growth and Differentiation Factor
| Peter Besmer | Current Opinion in Cell Biology | 1991
Reviews early evidence connecting KIT ligand/Steel signaling to melanogenesis and explains why pigmentation defects occur when the ligand-receptor system is disrupted.
Developmental and Cellular Pigmentation Studies
Melasma, a Photoaging Disorder
| Thierry Passeron and Mauro Picardo | Pigment Cell & Melanoma Research | 2018
Reviews melasma as a photoaging-associated disorder and discusses dermal and epidermal signaling pathways, including SCF/KIT, that promote melanocyte activation.
Stem Cell Factor Rescues Dark Epidermal Pigmentation in Discreet Anatomic Locations in Albino and Fair-Skinned Mice
| Jillian C. Vanover et al. | Pigment Cell & Melanoma Research | 2016
Shows that increased SCF signaling can promote striking epidermal pigmentation even in mice carrying pigmentation-reducing genetic backgrounds.
Skin Pigmentation and Pigmentary Disorders: Focus on Epidermal/Dermal Cross-Talk
| Eleonora Bastonini, Daniela Kovacs and Mauro Picardo | Annals of Dermatology | 2016
Reviews how keratinocytes, fibroblasts, endothelial cells, and melanocytes exchange signals including SCF/KITLG to regulate normal and abnormal pigmentation.
From Tyrosine to Melanin: Signaling Pathways and Factors Regulating Melanogenesis
| Z. Rzepka et al. | Postepy Higieny i Medycyny Doswiadczalnej | 2016
Reviews melanogenic signaling from extracellular factors such as SCF through MITF and tyrosinase to final melanin synthesis.
SCF/c-kit Signaling Is Required in TPA-Induced Migration and Differentiation of Hair Follicle Melanocytes for Epidermal Pigmentation
| Multiple authors | Journal of Investigative Dermatology | 2015
Shows that SCF/KIT activation can mobilize melanocyte stem-cell descendants from hair follicles and generate epidermal pigmentation.
Skin as a Living Coloring Book: How Epithelial Cells Create Patterns of Pigmentation
| Weiner et al. | Pigment Cell & Melanoma Research | 2014
Reviews signaling between epithelial cells and melanocytes and explains the distinct functions of soluble and membrane-bound KITLG in pigment patterning.
Isolation and Characterization of Kit-Independent Melanocyte Precursors Induced in the Skin of Steel Factor Transgenic Mice
| Atsushi Kawaguchi et al. | Development Growth & Differentiation | 2008
Uses persistent Steel factor expression to investigate melanocyte precursor populations and the changing dependence of pigment cells on KIT signaling.
Defining the Conditions for the Generation of Melanocytes from Human Embryonic Stem Cells
| Multiple authors | Stem Cells | 2006
Uses KITLG and other developmental signals to produce melanocyte-lineage cells, illustrating KITLG's fundamental role in human melanocyte specification and survival.
Cooperative and Indispensable Roles of Endothelin 3 and KIT Signalings in Melanocyte Development
| Multiple authors | Developmental Dynamics | 2005
Demonstrates that KIT signaling interacts with other developmental pathways rather than acting alone in establishing the melanocyte lineage.
Transforming Growth Factor Beta1 Regulates Melanocyte Proliferation and Differentiation via Stem Cell Factor/KIT Signaling
| Multiple authors | Journal of Investigative Dermatology | 2002
Shows cross-talk between TGF-beta and SCF/KIT pathways during melanocyte development and differentiation.
SCF/c-kit Signaling Is Required for Cyclic Regeneration of the Hair Pigmentation Unit
| Multiple authors | FASEB Journal | 2001
Demonstrates that KIT signaling is required for normal melanocyte proliferation and differentiation during regeneration of pigmented hair.
The Regulation of Normal Melanocyte Proliferation
| Multiple authors | Pigment Cell Research | 2000
Reviews growth-factor regulation of human melanocytes, including KITLG/SCF as an important survival and proliferation signal.
Intracellular Signaling Mechanisms Leading to Synergistic Effects of Endothelin-1 and Stem Cell Factor on Human Melanocytes
| Genji Imokawa et al. | Journal of Biological Chemistry | 2000
Demonstrates cross-talk between SCF/KIT and endothelin signaling that amplifies melanocyte proliferation and activation.
The Biology of Stem Cell Factor and Its Receptor C-kit
| Leonard K. Ashman | International Journal of Biochemistry & Cell Biology | 1999
Reviews the molecular biology of SCF/KIT signaling and its roles in melanocytes and other KIT-dependent cell lineages.
Murine Cutaneous Mastocytosis and Epidermal Melanocytosis Induced by Keratinocyte Expression of Transgenic Stem Cell Factor
| Takahiro Kunisada et al. | Journal of Experimental Medicine | 1998
Keratinocyte production of SCF creates persistent epidermal melanocytes and hyperpigmentation in mice, closely modeling aspects of human epidermal pigmentation.
Stem Cell Factor, a Novel Cutaneous Growth Factor for Mast Cells and Melanocytes
| Multiple authors | Archives of Dermatological Research | 1995
Describes KITLG production by keratinocytes, fibroblasts, and endothelial cells and its effects on melanocyte survival, adhesion, migration, and proliferation.
Effect of Steel Gene Product on Melanogenesis in Avian Neural Crest Cell Cultures
| Lahav et al. | Pigment Cell Research | 1995
Extends the conserved role of KITLG-related signaling in pigment-cell development to avian neural crest-derived melanocytes.
Steel Factor Directs Melanocyte Development In Vitro through Selective Regulation of the Number of c-kit+ Progenitors
| Multiple authors | Developmental Biology | 1994
Shows how Steel factor/KITLG controls the size of the melanocyte precursor population during development.
Steel Factor Is Required for Maintenance, but Not Differentiation, of Melanocyte Precursors in the Neural Crest
| Murphy et al. | Developmental Biology | 1992
Demonstrates that KIT ligand is particularly important for maintaining melanocyte precursors rather than simply initiating pigment-cell differentiation.
In Utero Manipulation of Coat Color Formation by a Monoclonal Anti-c-kit Antibody
| Shin-Ichi Nishikawa et al. | EMBO Journal | 1991
Antibody blockade of KIT reveals distinct stages during which developing melanocytes depend on KIT signaling and profoundly alters pigmentation.
KITLG Mutations and Human Pigmentary Disorders
A Novel KITLG Mutation Causes Familial Progressive Hyperpigmentation and Hypopigmentation with Multiple Café-au-Lait Macules
| Xuefang Huang et al. | Indian Journal of Dermatology, Venereology and Leprology | 2026
Reports another pathogenic KITLG variant in patients with mixed pigmentation and multiple café-au-lait macules.
New Variant in KITLG Shapes the Pathogenesis of Familial Progressive Hyper- and Hypo-Pigmentation
| Bodan Wu et al. | Molecular Genetics and Genomics | 2026
Uses exome sequencing, genome editing, and RNA sequencing to connect newly identified KITLG variants with altered MITF and melanin-pathway transcription.
Familial Progressive Hyper- and Hypopigmentation Due to a Novel Variant in KITLG
| Henry Grantham et al. | British Journal of Dermatology | 2026
Reports a newly identified KITLG variant associated with familial progressive mixed pigmentation and expands the current clinical mutation catalogue.
A Case of Familial Progressive Hyperpigmentation with or without Hypopigmentation Presenting with Hypopigmented Striae along the Lines of Blaschko
| Multiple authors | Journal of Dermatology | 2024
Documents an unusual spatial pattern of KITLG-associated dyspigmentation and illustrates the wide phenotypic variability of these mutations.
Biallelic KITLG Variants Lead to a Distinct Spectrum of Hypomelanosis and Sensorineural Hearing Loss
| Vona et al. | Journal of the European Academy of Dermatology and Venereology | 2022
Shows that recessive KITLG variants can produce generalized hypomelanosis and auditory-pigmentary disease, emphasizing KITLG dosage and functional severity.
Identification of a Novel Mutation in the KITLG Gene in a Chinese Family with Familial Progressive Hyper- and Hypopigmentation
| J. Wang et al. | BMC Medical Genomics | 2021
Uses genetic analysis of a Chinese family to identify another disease-associated KITLG variant, expanding the known mutation spectrum.
De Novo Mutation in KITLG Gene Causes a Variant of Familial Progressive Hyper- and Hypo-Pigmentation
| Gorenjak et al. | Molecular Genetics & Genomic Medicine | 2021
Reports a de novo KITLG mutation and further demonstrates that altered ligand function can create complex mixtures of dark and light pigmentation.
Familial Progressive Hyper- and Hypopigmentation Caused by a Novel Mutation in Site II of the KITLG Gene
| Zhenfeng Liu et al. | Journal of Dermatology | 2021
Identifies a new KITLG mutation affecting a receptor-binding region and expands genotype-phenotype correlations for inherited dyspigmentation.
Novel Mutation in the KITLG Gene in Familial Progressive Hyperpigmentation with or without Hypopigmentation
| Maki Kato et al. | Journal of Dermatology | 2020
Identifies KITLG p.Glu113Lys and expands the range of ligand-receptor interaction sites capable of producing abnormal pigmentation.
Familial Progressive Hyper- and Hypopigmentation: A Report on a Chinese Family and Evidence for Genetic Heterogeneity
| Fang Xiao-Kai et al. | Anais Brasileiros de Dermatologia | 2017
Describes an FPHH family without detectable KITLG mutations, demonstrating that clinically similar pigmentary disorders can have genetically different causes.
Report of a Child with Sporadic Familial Progressive Hyper- and Hypopigmentation Caused by a Novel KITLG Mutation
| J. Zhang et al. | British Journal of Dermatology | 2016
Describes a de novo KITLG mutation causing widespread mixed pigmentation, demonstrating that the disorder can appear without an affected family history.
Familial Progressive Hyper- and Hypopigmentation and Malignancy in Two Families with New Mutations in KITLG
| A. Cuell et al. | Clinical and Experimental Dermatology | 2015
Reports p.Thr34Asn and p.Val37Gly KITLG mutations and documents the variable pigmentation phenotype associated with these substitutions.
KITLG Mutations Cause Familial Progressive Hyper- and Hypopigmentation
| Mustapha Amyere et al. | Journal of Investigative Dermatology | 2011
Identifies several KITLG mutations in families with mixed hyper- and hypopigmentation, establishing KITLG as a major human pigmentation-disease gene.
The Genetic Determination of Skin Pigmentation: KITLG and the KITLG/c-Kit Pathway as Key Players in Human Familial Pigmentary Diseases
| Mauro Picardo and Giorgia Cardinali | Journal of Investigative Dermatology | 2011
Reviews evidence linking KITLG mutations and altered KIT signaling to inherited hyperpigmentation and hypopigmentation.
Gain-of-Function Mutation of KIT Ligand on Melanin Synthesis Causes Familial Progressive Hyperpigmentation
| Zhi-Qiang Wang et al. | American Journal of Human Genetics | 2009
Identifies the KITLG N36S mutation in a multigeneration family and shows experimentally that mutant KITLG substantially increases melanin production and tyrosinase activity.
KIT Mutations, Piebaldism, and Human Pigmentation Disorders
Novel Germline KIT Variants in Families with Severe Piebaldism: Case Series and Literature Review
| Multiple authors | Journal of Dermatological Science | 2024
Combines functional analysis with a literature review showing that severe piebaldism is particularly associated with variants affecting KIT kinase domains.
Piebaldism with Café-au-Lait Macules Resulting from a Novel Mutation of KIT Gene in a Three-Generation Chinese Family
| Xiaorong Li et al. | Skin Research and Technology | 2023
Reports a p.Thr661Ile mutation and analyzes the association between kinase-domain KIT variants and mixed hyper- and hypopigmentation.
Novel Pathogenic Variants in KIT Gene in Three Chinese Piebaldism Patients
| Multiple authors | Molecular Genetics & Genomic Medicine | 2022
Identifies three previously undescribed KIT variants and finds more severe phenotypes when mutations involve the receptor's tyrosine kinase domain.
Report of Two Japanese Patients with Piebaldism Including a Novel Mutation in KIT
| Kei Nagatani et al. | Journal of Dermatology | 2021
Adds another KIT variant to the growing catalog of mutations affecting human melanocyte distribution.
A Novel c.2326G>A KIT Pathogenic Variant in Piebaldism
| Multiple authors | American Journal of Translational Research | 2020
Functionally demonstrates reduced KIT signaling through STAT5 for a newly identified pathogenic piebaldism variant.
A Novel KIT Mutation in a Family with Expanded Syndrome of Piebaldism
| Issam Hamadah et al. | JAAD Case Reports | 2019
Describes an expanded clinical phenotype associated with a KIT variant, including pigmentation and additional developmental abnormalities.
Piebaldism with Multiple Café-au-Lait-Like Hyperpigmented Macules and Inguinal Freckling Caused by a Novel KIT Mutation
| Jerry C. Nagaputra et al. | JAAD Case Reports | 2018
Illustrates the capacity of KIT pathway abnormalities to produce simultaneous regions of hypopigmentation and hyperpigmentation.
Identification of a Novel KIT Mutation in a Chinese Family Affected with Piebaldism
| Multiple authors | Chinese Journal of Medical Genetics | 2016
Identifies a p.Leu862Pro KIT mutation in a multigeneration family and reinforces the importance of the receptor kinase domain.
A Novel Missense KIT Mutation Causing Piebaldism Associated with Café-au-Lait Macules and Intertriginous Freckling
| Multiple authors | International Journal of Dermatology | 2015
Shows that KIT-associated piebaldism can include substantial hyperpigmentation as well as depigmented areas.
A Novel Splicing Mutation of KIT Results in Piebaldism and Auburn Hair Color in a Chinese Family
| Yong-jia Yang et al. | BioMed Research International | 2013
Connects a KIT splice mutation not only to piebaldism but also to altered hair pigmentation.
A Novel Mutation of the KIT Gene in a Chinese Family with Piebaldism
| Multiple authors | Genetics and Molecular Research | 2013
Identifies the p.Ser864Pro KIT mutation and expands the spectrum of variants capable of disrupting melanocyte development.
Identification of Novel KIT Gene Mutations in Two Chinese Families with Piebaldism
| Wen-bin He et al. | Chinese Journal of Medical Genetics | 2013
Reports two distinct KIT mutations, including a splice-altering variant, in independent families with congenital depigmentation.
Piebaldism
| Naoki Oiso et al. | Journal of Dermatology | 2013
Reviews the clinical presentation, molecular genetics, KIT signaling defects, and genotype-phenotype relationships of human piebaldism.
A Novel KIT Missense Mutation in One Chinese Family with Piebaldism
| Multiple authors | Journal of Dermatological Science | 2009
Identifies a previously undescribed KIT mutation segregating with congenital depigmentation in a Chinese family.
Piebald Trait: Implication of KIT Mutation on In Vitro Melanocyte Survival and the Clinical Application of Cultured Epidermal Autografts
| Multiple authors | Journal of Investigative Dermatology | 2007
Shows that different KIT mutations influence melanocyte survival in culture and examines restoration of pigmentation through epidermal transplantation.
New KIT Mutations in Patients with Piebaldism
| Tomoko Murakami et al. | Journal of Dermatological Science | 2004
Reports six additional KIT mutations and evaluates how mutation type corresponds with pigmentation severity.
Human Piebaldism: Six Novel Mutations of the Proto-Oncogene KIT
| Multiple authors | Human Mutation | 2002
Identifies missense, nonsense, and splice-site KIT mutations that broaden the known molecular causes of piebaldism.
A Novel KIT Mutation Results in Piebaldism with Progressive Depigmentation
| K. A. Richards et al. | Journal of the American Academy of Dermatology | 2001
Reports a KIT Val620Ala mutation associated with unusually progressive rather than static loss of pigmentation.
Mutations in the Ligand-Binding Domain of the Kit Receptor: An Uncommon Site in Human Piebaldism
| Multiple authors | American Journal of Human Genetics | 1996
Identifies extracellular KIT mutations affecting interaction with KIT ligand and shows that altered ligand binding can cause piebaldism.
Novel Mutations and Deletions of the KIT Gene in Human Piebaldism
| K. Ezoe et al. | American Journal of Human Genetics | 1995
Surveys patients with piebaldism and identifies multiple pathogenic KIT mutations and deletions affecting melanocyte development.
Human Piebaldism: Relationship between Phenotype and Site of KIT Gene Mutation
| K. A. Ward et al. | British Journal of Dermatology | 1995
Examines how the location of KIT mutations influences the extent and severity of congenital depigmentation.
Molecular Basis of Human Piebaldism
| Richard A. Spritz | Journal of Investigative Dermatology | 1994
Reviews early molecular evidence establishing defective KIT signaling as the principal cause of classic human piebaldism.
Novel Mutations of the KIT Proto-Oncogene in Human Piebaldism
| Richard A. Spritz et al. | Journal of Investigative Dermatology | 1993
Describes additional KIT kinase-domain mutations and relates impaired KIT signaling to failed melanocyte proliferation and migration.
Mutations of the KIT Proto-Oncogene Account for a Continuous Range of Phenotypes in Human Piebaldism
| Richard A. Spritz et al. | American Journal of Human Genetics | 1992
Demonstrates that different KIT mutations produce varying degrees of melanocyte loss and therefore a continuum of piebald pigmentation phenotypes.
Mutation of the KIT Protooncogene in Human Piebaldism
| L. B. Giebel and Richard A. Spritz | Proceedings of the National Academy of Sciences | 1991
Landmark study identifying a KIT mutation causing human piebaldism and linking human depigmentation to the mouse dominant-white-spotting phenotype.
Comparative and Experimental KITLG Pigmentation Genetics
Genetic Analysis of Iris Pigmentation in Swiss Pig Breeds Identifies a Missense KITLG Variant as a Potential Causal Factor
| Multiple authors | Animal Genetics | 2026
Identifies a KITLG coding variant associated with pale and heterochromatic irises, extending KITLG's pigmentary effects beyond skin and hair.
Phenotypic Impact on Coat Color and Uterine Development in Mice Carrying a Missense Mutation Associated with Bovine White Heifer Disease
| Multiple authors | Scientific Reports | 2026
Tests a cattle KITL mutation experimentally in mice and demonstrates its effects on pigmentation and reproductive development.
The Genetic Basis of Divergent Melanic Pigmentation in Benthic and Limnetic Threespine Stickleback
| Multiple authors | Heredity | 2024
Extends research on the genetics of naturally evolved pigmentation differences in sticklebacks, an important comparative system that originally helped reveal KITLG's role in humans.
A Copy Number Variant Near KITLG Is Associated with the Roan Pattern in Alpacas
| Ishani Shah et al. | Animal Production Science | 2023
Associates a large copy-number variant near KITLG with the roan coat pattern, providing another example of regulatory structural variation altering pigmentation.
Genomic Regions Underlying Positive Selection in Local Alpine Cattle Breeds
| Multiple authors | Animal Genetics | 2023
Reports genomic selection signals in locally adapted cattle and includes KITLG among candidate genes influenced by breed-specific selection.
Roan Coat Color in Livestock
| Katharina Voß et al. | Animal Genetics | 2022
Reviews KIT and KITLG as major candidate genes for roan and related coat-color phenotypes across cattle, horses, pigs, sheep, goats, and alpacas.
Tracking Footprints of Artificial and Natural Selection Signatures in Breeding and Non-Breeding Cats
| Multiple authors | Scientific Reports | 2022
Examines selection across domestic cat genomes and provides comparative evidence useful for understanding how pigmentation-related loci such as KITLG respond to natural and artificial selection.
Genetics and Genomics of Pigmentation Variability in Pigs: A Review
| Luca Fontanesi | Livestock Science | 2022
Reviews KITLG, KIT, MC1R, EDNRB, SLC45A2 and other genes responsible for the extraordinary diversity of pigmentation in domestic pigs.
Canine Coat Pigmentation Genetics: A Review
| L. Brancalion, B. Haase and C. M. Wade | Animal Genetics | 2022
Reviews known canine pigmentation loci and provides comparative context for KITLG regulatory variation affecting pigment intensity.
Pigment Intensity in Dogs Is Associated with a Copy Number Variant Upstream of KITLG
| Kalie Weich et al. | Genes | 2020
Finds that increased copy number of a regulatory element upstream of KITLG is associated with darker, more intense eumelanin and pheomelanin pigmentation in dogs.
Whole Genome Analysis of Water Buffalo and Global Cattle Breeds Highlights Convergent Signatures of Domestication
| Multiple authors | Nature Communications | 2020
Identifies selection signals affecting pigmentation and domestication traits, including genomic regions involving KITLG and related pigment biology.
Identification of kit-ligand a as the Gene Responsible for the Medaka Pigment Cell Mutant few melanophore
| Yuji Otsuki et al. | G3: Genes, Genomes, Genetics | 2020
Shows that loss of kitlga dramatically reduces melanophore and leucophore numbers in medaka fish.
Genome-Wide Association Studies for Iris Pigmentation and Heterochromia Patterns in Large White Pigs
| Multiple authors | Animal Genetics | 2020
Identifies a KITLG genomic region associated with heterochromia and eye depigmentation phenotypes in pigs.
Genomic Analysis Suggests KITLG Is Responsible for a Roan Pattern in Two Pakistani Goat Breeds
| Multiple authors | Journal of Heredity | 2017
Identifies a strong genomic selection signal containing KITLG in goats with intermixed white and pigmented hairs.
Genomic Differentiation between Spanish Cattle Breeds
| Multiple authors | Animal | 2017
Identifies KITLG-containing genomic regions among strong differentiation signals in cattle breeds with contrasting phenotypes including coat color.
Reverse Genetic Screen for Loss-of-Function Mutations Uncovers a Frameshifting Deletion Responsible for a Distinctive Coat Color in Belgian Blue Cattle
| Multiple authors | Animal Genetics | 2016
Studies coat-color dilution in cattle whose background pigmentation is also controlled by the KITLG-associated roan locus.
A Copy Number Variant at the KITLG Locus Likely Confers Risk for Canine Squamous Cell Carcinoma of the Digit
| Multiple authors | PLOS Genetics | 2013
Studies structural variation near canine KITLG and illustrates the pleiotropic consequences of a locus involved in both pigmentation and cell proliferation.
On the Embryonic Origin of Adult Melanophores: The Role of ErbB and Kit Signalling in Establishing Melanophore Stem Cells in Zebrafish
| Multiple authors | Development | 2013
Identifies kitlga as essential for embryonic melanophore populations and the establishment of pigment-cell stem cells used later in life.
Molecular Genetics of Coat Colour Variations in White Galloway and White Park Cattle
| Multiple authors | Animal Genetics | 2013
Investigates KIT, KITLG, MC1R, and TYR in cattle and illustrates how several pigmentation pathways interact to produce white and colored coat patterns.
Signatures of Diversifying Selection in European Pig Breeds
| Multiple authors | PLOS Genetics | 2013
Detects breed-differentiation signals near pigmentation genes and identifies KITLG variation as a possible contributor to coat-color diversification.
Pleiotropic Effects of Coat Colour-Associated Mutations in Humans, Mice and Other Mammals
| Multiple authors | Seminars in Cell & Developmental Biology | 2013
Reviews KITLG and other pigmentation genes whose mutations affect not only coloration but hearing, reproduction, development, and other biological systems.
Exclusion of Candidate Genes for Coat Colour Phenotypes of the American Mink
| Multiple authors | Animal Genetics | 2012
Tests KITLG and other pigmentation genes in mink and demonstrates that visually similar coat-color phenotypes can arise through entirely different genetic pathways.
Characterization of the Porcine KIT Ligand Gene: Expression Analysis, Genomic Structure, Polymorphism Detection and Association with Coat Colour Traits
| C. Hadjiconstantouras et al. | Animal Genetics | 2008
Characterizes pig KITLG structure and variation and evaluates the gene as a candidate regulator of coat pigmentation.
Gene Duplication of the Zebrafish kit Ligand and Partitioning of Melanocyte Development Functions to kit Ligand a
| Multiple authors | Genetics | 2007
Demonstrates that zebrafish kitla controls melanocyte migration and survival and that increased kitla expression produces hyperpigmentation.
Sticklebacks and Humans Walk Hand in Fin to Lighter Skin
| Janette W. Boughman | Cell | 2007
Commentary on the KITLG stickleback-human comparison explaining why repeated regulatory evolution of the same pigmentation gene is important for understanding convergent evolution.
Sequencing, Mapping and Nucleotide Variation of Porcine Coat Colour Genes Including KITLG
| Multiple authors | Animal Genetics | 2006
Surveys sequence variation in KITLG and several other major pigmentation genes as candidate determinants of pig coat-color diversity.
Effects of Spontaneous Kitl Steel Mutations on Survival and Red Blood Cells of Mice
| Multiple authors | Mammalian Genome | 2003
Characterizes spontaneous Kitl mutations whose pleiotropic consequences include pigmentation abnormalities alongside hematological defects.
An Allelic Series of Mutations in the Kit Ligand Gene of Mice: Effects of ENU-Induced Kitl Point Mutations
| Multiple authors | Mammalian Genome | 2002
Examines multiple Kitl mutations and shows that even heterozygotes frequently display reduced coat pigmentation.
Altered Cell-Surface Targeting of Stem Cell Factor Causes Loss of Melanocyte Precursors in Steel17H Mutant Mice
| Bernhard Wehrle-Haller and James A. Weston | Developmental Biology | 1999
Shows that proper cellular localization of membrane KITLG is critical for melanocyte precursor survival, highlighting the importance of regulatory and trafficking mechanisms.
Activation of the Receptor Tyrosine Kinase Kit Is Required for the Proliferation of Melanoblasts in the Mouse Embryo
| Multiple authors | Developmental Biology | 1997
Demonstrates directly that KIT signaling is necessary for expansion of embryonic melanoblast populations.
The Murine Steel Panda Mutation Affects Kit Ligand Expression and Growth of Early Ovarian Follicles
| Multiple authors | Developmental Biology | 1993
Shows that reduced Kit ligand expression in Steel Panda mice produces a distinctive pale coat as part of a pleiotropic developmental phenotype.
Transgene-Induced Mutation of the Murine Steel Locus
| S. A. Keller et al. | Proceedings of the National Academy of Sciences | 1990
Links disruption of the mouse Steel locus to diluted pigmentation, helping establish what was later recognized as the KIT ligand gene.
