The HERC2 Gene
- NOTOC**
The HERC2 Gene
HERC2 is a large human gene with roles extending from the visible traits of eye, hair, and skin pigmentation to protein degradation, DNA repair, chromosome stability, neurodevelopment, iron metabolism, and cellular responses to stress. Research on HERC2 illustrates how a single genomic region can influence human appearance while the protein encoded by the gene performs fundamental functions inside cells.
One of the best-known genetic variants associated with HERC2 is rs12913832. Located within an intron of HERC2, this variant is a major determinant of blue versus brown eye color in many populations of European ancestry. Its pigmentation effect occurs largely because the HERC2 region contains a regulatory element that controls expression of the neighboring OCA2 gene, which participates directly in melanin biology.
HERC2 itself encodes a very large HECT-domain E3 ubiquitin ligase. E3 ubiquitin ligases help determine which proteins are tagged with ubiquitin and subsequently altered, relocated, or degraded. Through this activity and through its many protein-interaction domains, HERC2 participates in a wide range of cellular pathways.
HERC2, OCA2, and Human Pigmentation
The HERC2-OCA2 region on chromosome 15 is among the most important known genetic regions influencing human iris pigmentation. Genome-wide association studies, population studies, and functional experiments repeatedly identify HERC2 rs12913832 as a major determinant of eye-color variation.
The biological importance of rs12913832 arises from its regulatory effect rather than from a change to the HERC2 protein itself. Functional studies indicate that the region containing the variant acts as a long-range regulatory element for OCA2. Differences at rs12913832 influence chromatin-loop formation between the HERC2 regulatory region and the OCA2 promoter. This alters OCA2 expression and ultimately affects melanin production within the iris.
Although HERC2 has a particularly large effect on blue-brown eye-color differences, human eye color is not controlled by a single gene. Variants in OCA2, TYR, TYRP1, SLC24A4, SLC45A2, MC1R, and other pigmentation genes can modify the phenotype. These interactions help explain intermediate colors such as green and hazel and cases in which a person's observed eye color differs from that predicted by HERC2 genotype alone.
Research in European, South Asian, Middle Eastern, East Asian, Latin American, and admixed populations also demonstrates that the effects and frequencies of HERC2 variants vary substantially among populations. For this reason, pigmentation models developed in one population do not always transfer perfectly to another.
HERC2-associated variation has also been investigated in relation to hair color, skin pigmentation, tanning, freckling, iris freckles, and nevi. The HERC2-OCA2 region therefore contributes to a broader pigmentation network rather than functioning exclusively as an eye-color locus.
Ancient-DNA studies provide evidence that pigmentation-associated alleles in the HERC2-OCA2 region changed substantially in frequency during relatively recent European prehistory. Such findings indicate that pigmentation traits were subject to evolutionary change and possibly natural selection as human populations adapted to different environments.
HERC2 in Forensic DNA Phenotyping
The exceptionally strong association between HERC2 rs12913832 and iris pigmentation has made the variant one of the most important markers in forensic DNA phenotyping.
Systems such as IrisPlex and HIrisPlex combine HERC2 with several additional pigmentation genes to estimate externally visible characteristics from DNA. These systems can be used to predict categories of eye color and, in expanded models, hair and skin pigmentation.
Validation studies across European populations demonstrated particularly strong performance for distinguishing blue from brown eyes. Later research tested HERC2-based prediction systems in populations from Pakistan, Saudi Arabia, Latin America, Eastern Europe, and other regions.
These studies also demonstrate an important limitation: HERC2 is highly informative but not completely deterministic. Additional pigmentation loci, ancestry, gene-gene interactions, and other biological factors can modify the observed phenotype. Modern forensic models therefore use panels of markers rather than relying on HERC2 alone.
Protein Structure and Ubiquitination
HERC2 is an unusually large protein containing multiple domains involved in protein interaction and regulation. Its defining feature is a HECT ubiquitin-ligase domain, which allows HERC2 to participate directly in the transfer of ubiquitin to target proteins.
Studies of HERC2 protein structure have identified several regions capable of binding other proteins, chromatin components, and regulatory molecules. Its C-terminal region contains the catalytic HECT domain, while additional domains contribute to interactions involving p53, histones, SUMO proteins, DNA-repair factors, centrosomal proteins, and other cellular components.
Proteomic studies have identified hundreds of potential HERC2-associated proteins. These interactions connect HERC2 with processes including protein translation, intracellular trafficking, energy metabolism, centrosome organization, DNA replication, ubiquitination, and iron homeostasis.
HERC2 also interacts with UBE3A, another E3 ubiquitin ligase whose dysfunction is central to Angelman syndrome. HERC2 can stimulate UBE3A ubiquitin-ligase activity, creating an important molecular connection between these proteins.
Research has additionally linked HERC2 with quality control of large protein complexes. HERC2 can help recognize unassembled or abnormal protein subunits and contribute to their elimination, indicating that the protein participates in maintaining cellular protein quality.
Neurodevelopment and HERC2-Related Disorders
Pathogenic variants affecting HERC2 can produce rare neurodevelopmental disorders. Human genetic studies have described both relatively mild hypomorphic variants and severe biallelic loss-of-function mutations.
Reported manifestations include developmental delay, intellectual disability, autistic features, gait instability, motor abnormalities, and Angelman-like characteristics. Severe disruption of HERC2 can produce profound developmental impairment and may affect multiple cellular systems.
Some pathogenic variants reduce HERC2 protein stability or eliminate functional protein altogether. Research on affected individuals and experimental systems has identified downstream abnormalities involving mitochondrial function, energy metabolism, translation, ubiquitination, DNA repair, autophagy, and cellular stress responses.
HERC2 deficiency has also been linked with altered regulation of the USP20-ULK1 pathway and abnormal autophagy. Other studies indicate changes in C-RAF, MKK3, and p38 signaling and altered responses to oxidative stress.
The broad phenotype associated with severe HERC2 deficiency reflects the gene's involvement in numerous fundamental cellular pathways rather than a single neurological mechanism.
DNA Repair and Genome Stability
HERC2 plays an important role in protecting the genome from damage.
During DNA double-strand-break repair, HERC2 helps coordinate proteins including RNF8, Ubc13, and RNF168. These proteins participate in ubiquitin signaling around damaged chromosomal regions, allowing additional repair factors to assemble at the site.
DNA damage can also cause HERC2 to become SUMOylated, promoting interactions involved in repair signaling. These findings illustrate close cooperation between the ubiquitin and SUMO systems during the cellular response to damaged DNA.
HERC2 additionally regulates several proteins involved in DNA replication and repair. These include BRCA1, XPA, Claspin, replication protein A, and the BLM and WRN helicases.
HERC2-mediated ubiquitination can regulate the abundance of the nucleotide-excision-repair protein XPA. Following ultraviolet damage, ATR-dependent signaling can protect XPA from HERC2-mediated degradation, allowing DNA repair capacity to increase when needed.
HERC2 also participates in replication-stress responses. Through pathways involving USP20, Claspin, CHK1, and RPA2, it helps coordinate cellular reactions when replication forks encounter problems.
Research involving the BLM and WRN helicases suggests another role in suppressing potentially harmful G-quadruplex DNA structures. Together, these findings place HERC2 within a broad network that maintains chromosome stability and protects cells from mutations.
HERC2 and p53
HERC2 also interacts with the tumor-suppressor protein p53.
Rather than simply determining how much p53 protein is present, HERC2 can promote p53 oligomerization, an important step in forming transcriptionally active p53 complexes. Research involving HERC2 and the associated protein NEURL4 further connects the gene with regulation of the MDM2-p53 pathway.
Because p53 is central to cellular responses to DNA damage, abnormal growth, and potentially cancerous changes, the interaction provides another connection between HERC2, genome surveillance, and cancer biology.
Iron Homeostasis, Ferritinophagy, and Ferroptosis
HERC2 has emerged as an important regulator of cellular iron metabolism.
One major HERC2 target is NCOA4, a protein involved in ferritinophagy. Ferritinophagy is the process through which ferritin, the major intracellular iron-storage complex, is delivered for degradation so that stored iron can be released.
Cellular iron availability influences HERC2-mediated degradation of NCOA4. Structural and biochemical research indicates that an iron-sulfur cluster associated with NCOA4 contributes to its recognition by HERC2. This provides a mechanism through which cells can couple iron sensing to ferritin turnover.
HERC2 also regulates FBXL5, another major component of cellular iron homeostasis. By controlling proteins such as NCOA4 and FBXL5, HERC2 participates in balancing iron storage, release, and iron-responsive signaling.
This pathway has important implications for ferroptosis, an iron-dependent form of regulated cell death associated with lipid peroxidation. Changes in HERC2 expression or HERC2-NCOA4 interactions have been investigated in toxicology, liver injury, cancer, osteoarthritis, and other disease models.
Research reported through 2026 indicates that HERC2-mediated control of iron metabolism may therefore be important not only for basic cellular physiology but also for disorders involving abnormal ferroptosis.
Cancer and Melanoma
HERC2 has several connections with cancer biology.
Pigmentation-associated variants in the HERC2-OCA2 region have been studied in relation to uveal melanoma, cutaneous melanoma, and squamous-cell carcinoma. Because lighter pigmentation is associated with some forms of skin and ocular cancer risk, researchers have investigated whether pigmentation alleles themselves contribute to susceptibility.
HERC2 rs12913832 has also been associated in some studies with survival differences among patients with uveal melanoma.
Separate from pigmentation genetics, the HERC2 protein influences cancer-related pathways through its effects on BRCA1, p53, DNA repair, replication stress, iron metabolism, and immune signaling.
Research in hepatocellular carcinoma has linked HERC2 with cancer stemness and PD-L1-mediated immune evasion through the JAK2-STAT3 pathway. Other studies suggest that manipulating HERC2-associated DNA-repair pathways may affect the sensitivity of cancer cells to radiation or other treatments.
These observations show that the relationship between HERC2 and cancer extends well beyond pigmentation.
Immunity, Liver Biology, and Cardiovascular Function
Research has identified additional roles for HERC2 in immune, hepatic, and cardiovascular pathways.
In liver cells, HERC2 has been reported to influence β-catenin degradation and CYP2E1 expression, with experimental studies suggesting that these effects can alter susceptibility to drug-induced liver injury.
HERC2 has also been implicated in antiviral responses to hepatitis B virus. Research indicates that HERC2 can promote ubiquitination and activation of TBK1, helping stimulate downstream type-I-interferon signaling.
In cardiovascular biology, HERC2 has been reported to contribute to angiotensin-II-induced cardiac hypertrophy through regulation of MeCP2 and the pro-hypertrophic factor Lin28a.
These findings continue to expand the known biological scope of HERC2.
Chromosome 15 and Genomic Architecture
HERC2 is also important to the structural history of chromosome 15.
Early genomic research showed that sequences derived from HERC2 occur within several large segmental duplications in the chromosome 15q11-q14 region. These low-copy repeats can serve as substrates for abnormal recombination.
HERC2-derived duplicated sequences have been found near rearrangement breakpoints associated with deletions and duplications in the chromosome 15 region containing genes involved in Prader-Willi syndrome and Angelman syndrome.
This genomic architecture illustrates how HERC2 is significant both as a functional gene and as part of a chromosome structure capable of influencing genomic rearrangements.
A Gene with Two Very Different Public Identities
HERC2 is unusual because it is widely recognized for two very different reasons.
In human population genetics, it is best known because a regulatory variant inside the gene has an exceptionally strong influence on eye color through its control of OCA2. This discovery has made HERC2 a central gene in pigmentation research, studies of human evolution, ancient DNA, and forensic phenotype prediction.
In molecular and medical biology, however, HERC2 is primarily a massive ubiquitin ligase involved in protein quality control, DNA repair, replication, neurodevelopment, iron metabolism, and cellular signaling.
The pigmentation-associated rs12913832 variant should therefore not be interpreted as representing the full biological function of HERC2. The variant occurs inside HERC2 but exerts much of its visible pigmentation effect by regulating a neighboring gene.
Conclusion
HERC2 occupies an unusually broad position in human genetics and cell biology. A regulatory region within the gene contains one of the strongest known common genetic determinants of human eye color, while the HERC2 protein itself is a large ubiquitin ligase that helps regulate numerous essential cellular systems.
Studies of HERC2 connect pigmentation genetics with gene regulation, chromatin architecture, forensic DNA phenotyping, evolutionary biology, protein degradation, neurodevelopment, DNA repair, replication, p53 signaling, iron homeostasis, ferritinophagy, ferroptosis, immunity, and cancer.
The HERC2-OCA2 relationship is also an important example of a broader principle in genetics: a genetic variant located within one gene can influence a trait primarily by regulating another gene nearby. At the same time, pathogenic variants that directly impair HERC2 demonstrate that the protein has critical biological functions entirely separate from pigmentation.
Continuing research is expanding the role of HERC2 well beyond its original association with eye color, revealing a gene that links visible human variation with some of the cell's most fundamental mechanisms for maintaining protein quality, genome stability, metabolic balance, and normal development.
- TOC**
HERC2, OCA2, and Human Pigmentation
| Abbatangelo et al. | Scientific Reports | 2026
This genome-wide association study examines eye-color variation after stratifying individuals according to HERC2 rs12913832 genotype, identifying additional pigmentation loci that help explain why eye color sometimes differs from that predicted by the major HERC2 marker alone.
| Multiple authors | Ophthalmic Genetics research | 2025
Analysis of more than 1,000 people identifies associations between HERC2 variants and iris freckles and nevi, illustrating how pigmentation genes can influence localized pigmentation patterns in addition to overall iris color.
| Multiple authors | International Journal of Molecular Sciences | 2024
The study examines three-dimensional chromatin organization around HERC2 rs12913832 and OCA2 and finds that important structural features of this regulatory region are evolutionarily conserved among vertebrates.
Sequencing approximately 500 kilobases around HERC2 and OCA2 identified additional variants that may help explain blue eyes in people carrying rs12913832 genotypes normally associated with brown eyes.
| Multiple authors | Human genetics research | 2022
This study confirms the exceptionally large contribution of the HERC2-OCA2 region to eye-color variation while identifying additional genetic signals involved in the complex continuum of human iris pigmentation.
| Multiple authors | Human population genetics research | 2021
Analysis of thousands of individuals from worldwide populations uses microsatellite and SNP variation to reconstruct the diversity and evolutionary history of the pigmentation-associated OCA2-HERC2 region.
| Various authors | American Journal of Physical Anthropology | 2021
Research examining evolutionary hypotheses for human pigmentation considers HERC2-associated eye and pigmentation variation alongside ultraviolet radiation, vitamin D, and folate biology.
| Multiple authors | Genome-wide association research | 2019
A GWAS of South Asian populations identifies pigmentation loci influencing skin and iris traits and provides evidence that the HERC2-OCA2 region contributes to iris pigmentation beyond European populations.
| Morgan et al. | Nature Communications | 2018
Analysis of UK Biobank participants identifies many loci influencing hair color, including the HERC2-OCA2 region, and illustrates the highly polygenic nature of pigmentation beyond major-effect variants.
| Siewierska-Górska et al. | Homo | 2017
The study assesses pigmentation SNPs in a Polish population and shows that variants in HERC2 and several melanogenesis-related genes contribute to inherited differences in hair color.
| Andrade et al. | Legal Medicine | 2017
Research in Brazil examines individual SNPs and haplotypes across OCA2 and HERC2 and demonstrates associations with eye, hair, and skin pigmentation in a highly admixed population.
| Multiple authors | Anthropological genetics research | 2016
Analysis of Polish children evaluates pigmentation variants including HERC2 and shows how combinations of genetic markers contribute to variation in hair and skin pigmentation before puberty.
| Multiple authors | Pigmentation genetics research | 2015
Quantitative analysis of iris pigmentation across ancestry groups identifies relationships involving HERC2 rs12913832 and demonstrates why continuous measurements can reveal genetic effects hidden by simple color categories.
| Liu et al. | Human Genetics | 2015
Genome-wide analyses identify multiple loci contributing to European skin pigmentation and place HERC2-OCA2 variation within the broader polygenic architecture of human pigmentation.
| Multiple authors | Genes | 2015
Twin and family data demonstrate high heritability of hair color and identify genome-wide significant pigmentation genes, including HERC2, contributing to blond, brown, red, and dark-hair variation.
| Various authors | Human Molecular Genetics | 2015
Genome-wide analysis of hair color in a Dutch population demonstrates the polygenic basis of pigmentation and detects contributions from the HERC2-OCA2 region.
| Wilde et al. | Proceedings of the National Academy of Sciences | 2014
Ancient DNA provides evidence that pigmentation alleles at loci including HERC2 underwent substantial frequency changes in prehistoric and historic European populations, consistent with recent natural selection.
| Various authors | Human Genetics | 2014
Analysis of epistasis among pigmentation genes demonstrates that HERC2 effects can interact with variation at other loci rather than acting independently.
| Visser, Kayser & Palstra | Genome Research | 2012
This landmark functional study demonstrates that the pigmentation-associated HERC2 variant changes long-range chromatin interactions with the OCA2 promoter, providing a biological mechanism for its dramatic influence on eye color.
| Multiple authors | PLOS Genetics | 2012
Quantitative measurements reveal shared and trait-specific genetic determinants of pigmentation and confirm the large effect of the HERC2-OCA2 region on iris color.
| Multiple authors | Human Genetics | 2012
Worldwide population data are used to investigate haplotypes and allele frequencies around OCA2 and HERC2, placing European light-eye pigmentation in a global evolutionary context.
| White & Rabago-Smith | Journal of Human Genetics | 2011
This review explains why human eye color does not follow a simple Mendelian model and describes HERC2 and OCA2 as the two most influential neighboring genes underlying blue-brown iris variation.
| Pośpiech et al. | Journal of Human Genetics | 2011
Analysis of pigmentation genes identifies interactions between HERC2 and OCA2, SLC24A4, and TYRP1, helping explain hazel, green, and other eye colors that cannot be predicted by HERC2 alone.
| Multiple authors | American Journal of Physical Anthropology | 2011
This methodological study develops quantitative photographic measurements of iris pigmentation, improving the phenotypic precision needed for genetic studies of loci such as HERC2 and OCA2.
| Eriksson et al. | PLOS Genetics | 2010
Large web-based genetic studies of common human traits identify pigmentation associations involving HERC2 and demonstrate the value of participant-driven genome-wide research.
| Branicki et al. | Annals of Human Genetics | 2009
The study confirms strong associations between HERC2 rs12913832 and eye color and finds evidence that HERC2 interacts with MC1R in determining skin and hair pigmentation.
| Iida et al. | Cell Biochemistry and Function | 2009
Japanese population data demonstrate substantial population differences in the frequencies of HERC2-OCA2 pigmentation variants that were originally identified through European eye-color studies.
| Bradley, Pedersen & Mundy | American Journal of Physical Anthropology | 2009
Comparative primate research shows that blue eyes evolved independently in humans and blue-eyed black lemurs; the human phenotype is linked to HERC2 rs12913832 whereas the lemur phenotype has a different genetic origin.
| Sturm et al. | American Journal of Human Genetics | 2008
This landmark study identifies rs12913832 within HERC2 intron 86 as an exceptionally strong determinant of blue versus brown eyes and proposes that it regulates transcription of neighboring OCA2.
| Kayser et al. | American Journal of Human Genetics | 2008
Three independent GWAS and a linkage study identify chromosome 15q13.1 and HERC2 as the predominant genomic region influencing European iris-color variation.
Forensic DNA Phenotyping and Pigmentation Prediction
| Multiple authors | Genes | 2023
This review surveys genetic markers used to predict eye color from DNA and describes the HERC2-OCA2 locus, particularly rs12913832, as the most important component of modern forensic eye-color prediction systems.
| Multiple authors | Forensic genetics research | 2023
This study evaluates IrisPlex in a Pakistani population and provides evidence about the predictive behavior of HERC2 rs12913832 and other pigmentation markers outside the European populations in which many prediction systems were initially developed.
| Multiple authors | Forensic Science International: Genetics Supplement Series | 2022
Researchers investigate whether structural copy-number variation around OCA2 and HERC2 contributes to eye-color differences that cannot be explained entirely by common SNP-based prediction models.
| Various authors | Genes | 2022
Massively parallel sequencing for forensic appearance prediction includes HERC2 among the principal DNA markers used to reconstruct eye and other pigmentation phenotypes.
| Various authors | Forensic Science International: Genetics | 2021
Testing pigmentation prediction in Latin Americans evaluates HERC2-containing models in populations with substantial European, Indigenous American, and African admixture.
| Various authors | Genes | 2021
An OpenArray-based forensic DNA phenotyping assay combines HERC2 with additional pigmentation and ancestry markers for efficient analysis of externally visible traits.
| Various authors | Forensic Science International: Genetics | 2021
Research into appearance prediction from mixed forensic DNA explores how informative pigmentation markers such as HERC2 can be recovered from complex biological mixtures.
| Multiple authors | Forensic Science International: Genetics | 2020
The research examines individuals with the HERC2 genotype usually predicting blue eyes and demonstrates that variants in additional pigmentation genes can modify the phenotype toward brown or intermediate eye colors.
| Carratto et al. | Forensic Science International: Genetics | 2020
Pigmentation predictions from ancient and contemporary Native American genomes use HIrisPlex-S and related systems containing HERC2 markers to reconstruct eye, hair, and skin color.
| Various authors | Forensic Science International: Genetics | 2020
Optimization of eye-color prediction for northern Eurasian populations identifies additional HERC2-region markers that can improve predictions beyond standard European models.
| Multiple authors | Forensic Science International: Genetics | 2019
This study evaluates statistical and machine-learning methods for predicting pigmentation traits and finds HERC2 rs12913832 associated not only with eye color but also with skin color, tanning, and freckling.
| Multiple authors | Forensic Science International: Genetics Supplement Series | 2019
Researchers investigate HERC2 and OCA2 polymorphisms in a Belarusian population, adding population-specific evidence for the strong relationship between rs12913832 and human iris pigmentation.
| Multiple authors | Forensic genetics research | 2019
Testing pigmentation markers in a Saudi population demonstrates that HERC2 rs12913832 remains an important predictor while also highlighting population differences that affect forensic phenotype prediction accuracy.
| Various authors | Forensic Science International: Genetics | 2019
Massively parallel sequencing implementation of HIrisPlex-S demonstrates simultaneous genotyping of HERC2 and numerous other markers used to predict eye, hair, and skin pigmentation.
| Various authors | Forensic Science International: Genetics | 2018
Study of iris pigmentation in a Buenos Aires population evaluates the strong effect of HERC2 rs12913832 within an admixed Latin American population.
| Walsh et al. | Human Genetics | 2017
This research develops a DNA-based model for predicting skin color across diverse populations and evaluates HERC2 together with other major pigmentation genes in the genetic architecture of human coloration.
| Multiple authors | Forensic Science International: Genetics | 2015
This population study evaluates a compact set of pigmentation SNPs and shows that major variants such as HERC2 rs12913832 can provide substantial predictive power for externally visible traits.
| Various authors | Forensic Science International: Genetics | 2015
European hair-color prediction research includes HERC2 among the loci that improve genetically based reconstruction of externally visible characteristics.
| Walsh et al. | Forensic Science International: Genetics | 2014
The HIrisPlex validation study incorporates the major HERC2 eye-color marker into a combined system designed to infer eye and hair pigmentation from biological material.
| Multiple authors | Forensic Science International: Genetics | 2014
Multiple forensic laboratories tested the IrisPlex system, demonstrating reproducibility of eye-color prediction based on HERC2 rs12913832 and several additional pigmentation variants.
| Various authors | International Journal of Legal Medicine | 2014
Research on European samples examines genetic and sex-related influences on eye-color prediction, including the dominant contribution of HERC2 rs12913832.
| Multiple authors | Forensic genetics research | 2013
Objective digital classification of iris pigmentation improves analysis of genetic associations and confirms the dominant influence of HERC2-OCA2 variation while revealing effects on intermediate colors.
| Kastelic et al. | Croatian Medical Journal | 2013
Validation in Slovenia evaluates HERC2 rs12913832 and the other IrisPlex markers and demonstrates their usefulness for predicting blue and brown eyes in a European population.
| Multiple authors | Forensic Science International: Genetics | 2013
Researchers develop and test eye-color prediction models in New Zealand and confirm the central predictive importance of genetic variation in the HERC2-OCA2 region.
| Martinez-Cadenas et al. | Forensic Science International: Genetics | 2013
The study examines cases in which HERC2-based predictions disagree with observed eye color and reports that sex contributes to some of the unexplained phenotypic variation.
| Walsh et al. | Forensic Science International: Genetics | 2012
Testing thousands of European samples demonstrates the ability of IrisPlex, centered on HERC2 rs12913832, to distinguish blue and brown eyes across numerous European populations.
| Walsh et al. | Forensic Science International: Genetics | 2011
The foundational IrisPlex study demonstrates forensic prediction of eye color from a small SNP panel dominated by the strong effect of HERC2 rs12913832.
| Mengel-From et al. | Forensic Science International: Genetics | 2010
A Danish population study shows that HERC2 rs1129038 and rs12913832 strongly distinguish light from dark eyes, while OCA2 and SLC45A2 provide additional predictive information.
| Various authors | Forensic Science International: Genetics | 2010
Comparison of several European populations documents geographic variation in pigmentation-marker frequencies, including important HERC2 alleles.
HERC2 Protein Structure, Ubiquitination, and Cellular Function
| Sala-Gaston et al. | Cell Death Discovery | 2026
Proteasome dysfunction underlies HERC2-linked neurodevelopmental disorder with Angelman-like features. The study identifies numerous HERC2-dependent ubiquitination targets and shows that HERC2 helps control assembly and quality control of the 19S proteasome regulatory particle.
| Waters et al. | Protein Science | 2024
Structural analysis shows that the negatively charged C-terminal tail of HERC2 is intrinsically disordered but stabilizes the catalytic HECT C-lobe and may serve as a flexible protein-interaction scaffold.
| Various authors | Cell | 2023
Research on orphan protein-subunit quality control identifies HERC2 and ZNRD2 as components of a system that recognizes and eliminates unassembled protein-complex subunits.
| Various authors | Seminars in Cell & Developmental Biology | 2022
The HERC proteins and the nervous system. This review discusses how HERC2 and related ubiquitin ligases contribute to neuronal development, signaling, and neurological disease.
| Liu et al. | Structure | 2020
Structural studies reveal how the ZZ domain of HERC2 recognizes histone H3 and SUMO1, helping explain how HERC2 participates in chromatin-associated and DNA-damage pathways.
| Various authors | Molecular Biology and Evolution | 2019
Mapping polymorphic duplications identifies a partial HERC2 duplication and evidence that a linked HERC2 haplotype has experienced population-specific natural selection.
| Martínez-Noël et al. | Molecular & Cellular Proteomics | 2018
Network analysis of UBE3A-associated proteins examines the HERC2-UBE3A-NEURL4 complex and links it to DNA replication, translation, intracellular transport, and centrosome regulation.
| Cubillos-Rojas et al. | Scientific Reports | 2016
Mouse HERC2 inactivation causes embryonic lethality, while reduced HERC2 activity affects motor coordination and p53 regulation, establishing important physiological roles for the protein.
| García-Gonzalo and Rosa | Cellular and Molecular Life Sciences | 2016
Review of the HERC family summarizes HERC2 domain structure, ubiquitin-ligase activity, interacting proteins, developmental functions, and disease associations.
| Galligan et al. | Journal of Proteome Research | 2015
Proteomic analysis identifies nearly 300 potential HERC2-interacting proteins and connects HERC2 with translation, intracellular trafficking, energy metabolism, PI3K signaling, and iron homeostasis.
| Al-Hakim et al. | Molecular & Cellular Proteomics | 2012
Interaction proteomics identifies HERC2 and NEURL4 as regulators of centrosome architecture and demonstrates that HERC2-dependent ubiquitination contributes to maintaining normal centrosomal organization.
| Kühnle et al. | Journal of Biological Chemistry | 2011
HERC2 physically interacts with the Angelman-syndrome protein E6AP/UBE3A and stimulates its ubiquitin-ligase activity, providing an important molecular connection between the two enzymes.
| Kaustov et al. | Journal of Biological Chemistry | 2007
Structural analysis of CPH domains establishes a conserved protein-interaction module shared by CUL7, PARC, and HERC2 that recognizes the p53 tetramerization domain.
| Kasper et al. | Biochemical and Biophysical Research Communications | 2006
Identification of a conserved p53-binding domain in CUL7, PARC, and HERC2 provided an early mechanistic clue to the later-discovered interaction between HERC2 and p53.
| Pujana et al. | European Journal of Human Genetics | 2002
HERC2-containing duplicons occur at rearrangement breakpoints throughout chromosome 15q11-q14 and may facilitate deletions, duplications, and other structural genomic changes.
| Pujana et al. | Human Genetics | 2001
Study of chromosome 15 segmental duplications identifies HERC2-related sequences within low-copy repeat structures that contribute to the complex architecture of chromosome 15.
| Ji et al. | Genome Research | 2000
Detailed genomic analysis found that HERC2 contains 93 exons across roughly 250 kb and documented the complex evolutionary history of multiple HERC2-derived segmental duplications.
| Ji et al. | Human Molecular Genetics | 1999
Early characterization of HERC2 identified it as the ancestral gene underlying several low-copy repeats in the Prader-Willi/Angelman region and connected Herc2 mutations with severe developmental abnormalities in mice.
| Lehman et al. | Mammalian Genome | 1999
Molecular characterization of numerous Herc2 mutant mouse alleles connects gene disruption with tremor, growth abnormalities, juvenile lethality, impaired fertility, and sperm defects.
| Ji et al. | American Journal of Human Genetics | 1999
Analysis of Prader-Willi and Angelman deletion breakpoints shows that recombination can occur between large duplicated sequences derived from HERC2.
HERC2 Neurodevelopmental Disorders and Human Genetics
| Şenol et al. | Molecular Syndromology | 2025
A novel HERC2 variant identified in two siblings expands the phenotype of autosomal-recessive intellectual developmental disorder 38 and reports associated cardiomyopathy.
| Asghari Sarfaraz et al. | Journal of Neurogenetics | 2024
Whole-exome sequencing identifies a previously undescribed homozygous HERC2 stop variant that truncates the catalytic HECT domain in a child with intellectual developmental disorder.
| Sala-Gaston et al. | Human Molecular Genetics | 2024
HERC2 deficiency increases USP20 and stabilizes ULK1, producing abnormal autophagy and revealing a USP20-ULK1 pathway potentially involved in HERC2-related neurodevelopmental disease.
| Various authors | PubMed-indexed neuroscience study | 2024
Hesperidin was reported to influence dendritic-spine abnormalities by suppressing ferritinophagy through HERC2-dependent ubiquitination of NCOA4 in a chronic-stress mouse model.
| Various authors | PubMed-indexed human genetics study | 2022
Exome sequencing of families with syndromic intellectual disability illustrates the continuing role of HERC2 and other ubiquitin-pathway genes in diagnosing rare recessive neurodevelopmental disorders.
| Sala-Gaston et al. | Cellular and Molecular Life Sciences | 2022
HERC2 deficiency activates the C-RAF/MKK3/p38 pathway and changes cellular responses to oxidative stress, suggesting a signaling mechanism contributing to HERC2-related neurological disease.
| Various authors | American Journal of Medical Genetics | 2021
Analysis of additional patients distinguishes the relatively milder phenotype of hypomorphic HERC2 missense variants from the severe syndrome produced by biallelic loss-of-function variants.
| Various authors | PubMed-indexed genetics study | 2021
A complex genetic case involving HERC2 and AP3B2 deficiency together with Angelman syndrome illustrates how multiple chromosome 15 abnormalities can produce blended neurodevelopmental phenotypes.
| Various authors | Journal of Medical Genetics | 2021
A homozygous HERC2 frameshift causing complete loss of protein is associated with profound developmental delay, mitochondrial dysfunction, and childhood lethality.
| Lee et al. | Gynecological Endocrinology | 2020
Whole-exome sequencing identifies rare NOTCH2 and HERC2 missense variants in a family with central precocious puberty, suggesting possible roles for HERC2 outside its established neurological phenotypes.
| Abraham et al. | Biochemical and Biophysical Research Communications | 2019
Proteomic analysis of cells from people with pathogenic HERC2 variants finds broad changes involving mitochondrial biology, energy metabolism, translation, ubiquitination, immunity, and DNA repair.
| Morice-Picard et al. | European Journal of Human Genetics | 2017
Complete HERC2 loss causes a severe neurodevelopmental phenotype and alters cellular levels of DNA-repair proteins including XPA and BRCA1.
| Harlalka et al. | Journal of Medical Genetics | 2013
A pathogenic HERC2 mutation in Old Order Amish families produces developmental delay with Angelman-like characteristics and reduces HERC2 protein stability.
| Puffenberger et al. | Human Mutation | 2012
A homozygous HERC2 Pro594Leu mutation is linked to global developmental delay, autism spectrum disorder, gait instability, and reduced HERC2 abundance.
| Various authors | American Journal of Medical Genetics Part B | 2012
Gene-expression analysis in Tourette syndrome included HERC2 among chromosome 15 candidate genes examined for possible neurological effects.
DNA Repair, Replication, Chromatin, and Genome Stability
| Yue et al. | Acta Pharmaceutica Sinica B | 2023
BAP1 inhibition recruits HERC2 to the BRCA1-BARD1 complex, suppressing DNA repair and increasing colorectal-cancer sensitivity to radiation.
| Various authors | Scientific Reports | 2021
HERC2 inactivation disrupts nucleolar localization of BLM and WRN helicases and enhances cellular sensitivity to the G-quadruplex-stabilizing compound CX-5461.
| Various authors | iScience | 2021
ASPM protects BRCA1 from HERC2-mediated degradation, thereby sustaining homologous-recombination repair and chromosome stability.
| Various authors | International Journal of Molecular Sciences | 2021
Review of circadian regulation of nucleotide-excision repair explains how rhythmic XPA production interacts with HERC2-mediated XPA degradation.
| Various authors | International Journal of Molecular Sciences | 2020
Review of XPA biology highlights the ATR-HERC2-XPA regulatory axis and its importance for nucleotide-excision repair and genome protection.
| García-Cano et al. | Oncogene | 2020
HERC2 and NEURL4 regulate the MDM2-p53 pathway by controlling formation and activity of oligomeric p53-containing complexes.
| Lai et al. | Scientific Reports | 2019
HERC2 regulates ATR-dependent RPA2 phosphorylation and subsequently ubiquitinates phosphorylated RPA2, fine-tuning replication-stress signaling.
| Wu et al. | Cancer Research | 2018
HERC2 promotes interaction of BLM and WRN helicases with replication protein A, suppressing potentially harmful G-quadruplex DNA structures.
| Park and Kang | International Journal of Molecular Sciences | 2016
Review of nucleotide-excision repair describes HERC2-dependent control of XPA as an important post-translational mechanism regulating repair of ultraviolet-induced DNA damage.
| Zhu et al. | Nucleic Acids Research | 2014
The HERC2-USP20 pathway controls CLASPIN stability and CHK1 checkpoint activation, linking HERC2 ubiquitination to replication-stress responses.
| Yuan et al. | Nucleic Acids Research | 2014
An independent study shows that ATR phosphorylation disrupts the HERC2-USP20 interaction, allowing USP20 to stabilize Claspin during the DNA-damage response.
| Cubillos-Rojas et al. | Oncogene | 2014
HERC2 binds p53 and promotes its oligomerization, increasing p53 transcriptional activity without simply controlling p53 abundance.
| Lee et al. | Oncogene | 2013
ATR phosphorylation protects the nucleotide-excision-repair protein XPA from HERC2-mediated ubiquitination and degradation following ultraviolet damage.
| Danielsen et al. | Journal of Cell Biology | 2012
DNA damage induces HERC2 SUMOylation, enabling interaction with RNF8 and showing how SUMO and ubiquitin pathways cooperate during double-strand-break repair.
| Oestergaard et al. | DNA Repair | 2012
Experiments in chicken DT40 cells found that RNF8 and RNF168, but not HERC2, are essential for damage-induced ubiquitin foci, demonstrating species- or system-specific differences in the pathway.
| Izawa et al. | Cancer Research | 2011
HERC2 associates with replication-fork proteins and Claspin and helps regulate DNA-origin firing, MCM2 phosphorylation, and replication-fork progression.
| Kang et al. | Journal of Biological Chemistry | 2011
XPA abundance and nucleotide-excision-repair capacity are regulated post-translationally through HERC2-dependent ubiquitination and proteolysis.
| Various authors | Future Oncology | 2011
Review of DNA-damage responses in glioma discusses HERC2 with RNF8, RNF168, UBC13, BRCA1, and other components of double-strand-break signaling.
| Bekker-Jensen et al. | Nature Cell Biology | 2010
HERC2 coordinates assembly of RNF8, Ubc13, RNF168, and downstream DNA-repair factors at damaged chromosomes, establishing a central role in ubiquitin-dependent double-strand-break signaling.
| Wu et al. | Cancer Research | 2010
HERC2 ubiquitinates BARD1-unbound BRCA1 and promotes its degradation, demonstrating direct control over the stability of a major breast-cancer suppressor.
Iron Homeostasis, Ferritinophagy, and Ferroptosis
| Various authors | Environmental toxicology study | 2026
Neodymium-oxide nanoparticles alter HERC2 interactions with both NCOA4 and FBXL5, producing iron overload, lipid peroxidation, ferroptosis, and liver toxicity.
| Various authors | PubMed-indexed cancer study | 2026
SUV39H2-mediated methylation of NCOA4 enhances its interaction with HERC2 and degradation, reducing ferritinophagy and promoting ferroptosis resistance in triple-negative breast cancer.
| Various authors | PubMed-indexed osteoarthritis study | 2026
HERC2 promotes degradation of ferritin light chain, increases iron accumulation and ferroptosis in chondrocytes, and aggravates experimental osteoarthritis.
| Liu et al. | Proceedings of the National Academy of Sciences | 2025
Structural and biochemical work shows that an iron-sulfur cluster in NCOA4 promotes recognition by HERC2 and explains how cellular iron levels control NCOA4 turnover and ferritinophagy.
| Various authors | PubMed-indexed toxicology study | 2025
PFOS exposure promotes TRIM21-dependent HERC2 degradation, stabilizing NCOA4 and activating ferritinophagy and ferroptotic liver injury.
| Various authors | PubMed-indexed toxicology study | 2025
PFOA reduces HERC2 expression in chicken embryonic kidney cells, allowing NCOA4 accumulation and ferritinophagy-driven renal ferroptosis.
| Various authors | Cell Communication and Signaling | 2024
Review of the ferritinophagy-ferroptosis axis discusses HERC2 as a central regulator controlling NCOA4 abundance in response to cellular iron.
| Various authors | Molecular Cell | 2023
Oxygen tension alters iron sensing by NCOA4, with iron-sulfur-cluster formation promoting HERC2 recognition and proteasomal degradation under particular conditions.
| Anandhan et al. | Science Advances | 2023
NRF2 regulates cellular iron balance and ferroptosis partly by controlling HERC2 expression and its downstream regulation of NCOA4 and FBXL5.
| Various authors | PubMed-indexed iron-metabolism review | 2018
Review of IRP regulation discusses the upstream HERC2-FBXL5 pathway and its role in maintaining cellular iron homeostasis.
| Mancias et al. | eLife | 2015
Ferritinophagy through NCOA4 is required for normal erythropoiesis and is regulated by iron-dependent HERC2-mediated degradation of NCOA4.
| Moroishi et al. | Journal of Biological Chemistry | 2014
HERC2 targets the iron regulator FBXL5 for ubiquitin-dependent degradation, linking HERC2 directly to control of IRP2 signaling and intracellular iron concentrations.
Cancer, Melanoma, Immunity, Liver, and Cardiovascular Biology
| Various authors | PubMed-indexed ocular oncology study | 2026
Population-level analysis examines the geographic frequency of the HERC2 rs12913832 G allele, latitude, pigmentation, and possible evolutionary patterns associated with ocular melanoma.
| Gelmi et al. | Ophthalmology | 2025
This study investigates HERC2 rs12913832 in patients with uveal melanoma and reports an association between the pigmentation-related variant and patient survival, extending the significance of HERC2 beyond normal iris pigmentation.
| Zhou et al. | Journal of Cardiovascular Pharmacology | 2025
HERC2 promotes angiotensin-II-induced cardiac hypertrophy by ubiquitinating MeCP2 and increasing expression of the pro-hypertrophic regulator Lin28a.
| Various authors | PubMed-indexed hepatitis study | 2025
Hepatocyte HERC2 enhances antiviral immunity against hepatitis B virus by mediating K33-linked ubiquitination and activation of TBK1 and downstream type-I-interferon signaling.
| Various authors | PubMed-indexed ophthalmology study | 2025
Genetic analysis links pigmentation-associated loci including OCA2-HERC2 with variation in retinal pigment epithelium characteristics.
| Liu et al. | Advanced Science | 2024
Hepatocyte-targeted delivery of HERC2 protects against drug-induced liver injury by promoting β-catenin ubiquitination and limiting CYP2E1 expression.
| Liu et al. | Journal of Experimental & Clinical Cancer Research | 2023
HERC2 promotes hepatocellular-carcinoma stemness and PD-L1-mediated immune evasion through activation of the JAK2-STAT3 pathway.
| Multiple authors | Melanoma Research | 2022
The study examines melanoma susceptibility among people without common MC1R risk variants and identifies pigmentation-associated loci including the HERC2 region as contributors to melanoma or nevus-related phenotypes.
| Multiple authors | Review article | 2020
This review evaluates epidemiologic and genetic connections between iris pigmentation and uveal melanoma, discussing HERC2 and OCA2 among the major genes responsible for inherited eye-color differences.
| Various authors | British Journal of Dermatology | 2017
OCA2-HERC2 variants influence time to first cutaneous squamous-cell carcinoma in solid-organ transplant recipients, a population at exceptionally high skin-cancer risk.
| Ferguson et al. | Scientific Reports | 2016
This study connects inherited pigmentation genetics with uveal melanoma risk and identifies variants in pigmentation-associated regions, including HERC2-OCA2, as potential susceptibility factors.
| Various authors | Pigment Cell & Melanoma Research | 2016
Quantitative measurements of skin, hair, and iris pigmentation provide additional evidence for the phenotypic effects of HERC2 and interacting pigmentation loci.
| Multiple authors | Melanoma genetics research | 2010
This study examines the relationship between pigmentation-associated variation and melanoma susceptibility, incorporating the HERC2-OCA2 region alongside established melanoma genes.
| Sturm & Larsson | Pigment Cell & Melanoma Research | 2009
This influential review explains how HERC2 rs12913832 acts within a conserved regulatory element controlling OCA2 and discusses the genetics of both overall iris color and detailed iris patterns.
