Human Adaptation
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Human Adaptation
Human adaptation is the process through which human populations respond to environmental, dietary, climatic, biological, and cultural pressures over evolutionary time. Research in evolutionary genomics, ancient DNA, population genetics, physiology, archaeology, and anthropology shows that adaptation can involve changes in individual genes, coordinated shifts across many genes, physiological responses, cultural practices, and interactions between inherited biology and changing environments.
Human populations have occupied an exceptionally wide variety of environments, including tropical rainforests, Arctic regions, deserts, high mountains, coastal environments, and regions with heavy infectious-disease burdens. Different populations have sometimes developed different biological solutions to similar challenges, illustrating that human adaptation is not a single process but a collection of evolutionary responses shaped by local conditions and historical circumstances.
Evolutionary Genomics and Natural Selection
Modern genomic research has greatly expanded understanding of human adaptation. Genome-wide studies can identify regions of DNA that have changed in frequency because of natural selection, while ancient DNA makes it possible to track adaptive variants through time rather than relying only on patterns found in living populations.
Some adaptations involve strong selection on particular genetic variants, while others appear to result from smaller changes distributed across many genes. This latter process, often described as polygenic adaptation, helps explain how complex traits may evolve without a single mutation becoming dominant throughout a population.
Genomic evidence has identified adaptation associated with diet, pigmentation, immunity, metabolism, climate, ultraviolet radiation, altitude, and other environmental pressures. Researchers must also distinguish genuine signals of natural selection from patterns caused by population migration, demographic change, admixture, and genetic drift.
Gene-environment interactions further complicate human adaptation because the effects of inherited variants may depend upon environmental conditions. A genetic characteristic that is beneficial in one setting may be neutral or disadvantageous when conditions change.
Local Environmental Adaptation
As humans dispersed into different ecological regions, populations encountered new combinations of temperature, humidity, food availability, pathogens, ultraviolet radiation, and other pressures. Local adaptation reflects evolutionary responses to these conditions.
Human body form provides one example. Research has found relationships between climate and characteristics such as body mass, limb proportions, and surface-area-to-mass ratios. Nasal anatomy also varies among populations, with studies linking aspects of nasal and nasal-cavity morphology to temperature and humidity. These patterns are consistent with the role of the respiratory system in conditioning inhaled air under different climatic conditions.
Adaptation does not necessarily produce the same outcome in every population. Similar environmental pressures can lead to different genetic or physiological solutions depending upon existing genetic variation, population history, migration, and other factors.
Rainforest Adaptation and Body Size
Rainforest hunter-gatherer populations provide important examples of local adaptation. Genetic research involving African and Southeast Asian rainforest populations has identified selection affecting stature, growth pathways, metabolism, immunity, cardiovascular function, morphology, and sensory systems.
Reduced stature among some rainforest hunter-gatherer populations has been investigated as a potentially adaptive characteristic. Studies of African rainforest populations have identified genetic variation involving growth-related pathways, including GHR and IGF1, while broader genomic work has found evidence for polygenic adaptation influencing growth and body size.
Comparative studies suggest that similar traits may have evolved independently among populations living in different tropical rainforest regions. Research also demonstrates, however, that rainforest populations have histories of migration and admixture with neighboring agricultural populations. Human rainforest adaptation therefore reflects both local selection and complex population history.
Diet and Gene–Culture Coevolution
Diet is one of the clearest examples of interaction between biological and cultural evolution. Human populations have repeatedly changed their food systems through hunting and gathering, agriculture, pastoralism, food processing, cooking, and other technologies. These cultural changes altered the environments in which natural selection operated.
Lactase persistence is a particularly well-studied example. Most mammals lose much of their ability to digest lactose after infancy, but several human populations independently evolved genetic variants allowing continued lactose digestion in adulthood. These variants became associated with dairying and pastoralist societies in parts of Africa, Europe, and the Middle East.
Ancient DNA demonstrates that lactase-persistence alleles could remain uncommon for long periods after dairying began and then increase rapidly under strong selection. African populations contain multiple lactase-persistence variants associated with different pastoral histories, illustrating that similar cultural practices can produce independent evolutionary responses.
The human amylase gene region has also been studied in relation to starch digestion. Research indicates that structural variation in this genomic region is ancient, providing genetic diversity that could later contribute to dietary adaptation.
Taste and smell receptors may also reflect adaptation to different subsistence strategies. Comparisons of rainforest foragers and agricultural populations have identified differences in chemosensory genes associated with food environments and subsistence patterns.
Microbiomes and Dietary Flexibility
Human dietary adaptation extends beyond the human genome. The gut microbiome responds rapidly to differences in diet, ecology, and lifestyle and may have contributed to the ability of humans to use a wide range of foods.
Research on hunter-gatherer and other traditional populations demonstrates substantial variation in diet and nutrition. Rather than relying on a single ancestral diet, humans have developed flexible subsistence strategies shaped by geography, ecology, technology, and culture.
The microbiome may have helped buffer humans against environmental and dietary changes by expanding metabolic capabilities and responding to new food sources. It can therefore be viewed as another component of the broader adaptive system connecting biology with environment.
High-Altitude Adaptation
High-altitude populations demonstrate some of the most intensively studied examples of human physiological and genetic adaptation. Low oxygen levels at high elevations create strong biological pressures affecting respiration, circulation, metabolism, pregnancy, and fetal development.
Tibetan and Sherpa populations show selection involving genes such as EPAS1 and EGLN1, which participate in cellular responses to oxygen availability. These populations often display physiological characteristics that differ from the responses seen in people recently exposed to high altitude.
Andean highlanders provide a contrasting example. Studies have identified adaptations involving oxygen transport, uterine blood flow, maternal physiology, and fetal growth. Enhanced blood flow during pregnancy can help maintain oxygen delivery and reduce the effects of high altitude on birth weight.
Ethiopian high-altitude populations show still other physiological patterns, demonstrating that separate populations can adapt differently to similar hypoxic environments.
Diving and Marine Adaptation
Human adaptation can also involve specialized ways of exploiting marine environments. Research on the Bajau, traditionally associated with breath-hold diving, has examined physiological and genetic characteristics connected with oxygen storage and underwater endurance.
Studies have investigated enlarged spleens among Bajau populations and genetic pathways associated with thyroid signaling and spleen development. The spleen can contribute to oxygen availability during diving by releasing oxygen-carrying red blood cells into circulation.
This research illustrates how a culturally specialized subsistence practice can interact with biological evolution over generations.
Adaptation to Toxic Environments
Human populations have also lived for long periods in environments containing naturally occurring toxic substances. Populations in parts of the Atacama Desert, for example, have experienced long-term exposure to arsenic-rich water.
Genetic studies have identified unusually high frequencies of variants associated with arsenic metabolism among some populations in this region. Archaeological and biological evidence indicates that human exposure to arsenic there extends deep into the past.
Such findings demonstrate that natural selection can operate not only in response to climate, food, and disease but also to environmental toxins.
Archaic Introgression
Human adaptation was influenced not only by mutations arising within modern human populations but also by interbreeding with other human groups. Modern humans interbred with Neanderthals and Denisovans, leaving portions of archaic ancestry in many living populations.
Some inherited archaic variants appear to have provided useful genetic variation. Research has linked Neanderthal- or Denisovan-derived DNA with immune function, metabolism, environmental responses, and other traits.
Adaptive introgression occurs when genetic variants introduced through interbreeding subsequently increase in frequency because they provide an advantage. Researchers have developed methods to distinguish adaptive introgression from DNA segments that survived simply because of demographic history or genetic drift.
Some archaic variants affect gene regulation rather than protein structure. Studies of immune cells have identified Neanderthal- and Denisovan-derived regulatory variants that influence modern immune responses.
Archaic ancestry can have both beneficial and harmful consequences in present-day environments. Genetic variants that were advantageous under past conditions may have different effects after environments, diets, or disease exposures change.
Pathogens and Immune Adaptation
Infectious disease has been one of the strongest recurring selective pressures during human evolution. Pathogens have repeatedly shaped genes involved in innate immunity, adaptive immunity, blood-cell biology, and host-pathogen interactions.
Genomic evidence shows extensive natural selection involving immune genes. The transition from hunting and gathering to agriculture altered patterns of population density, animal contact, settlement, and disease exposure, creating new selective pressures on human immune systems.
Ancient DNA is increasingly allowing researchers to observe immune evolution through historical epidemics. Studies examining periods such as the Black Death have identified immune variants that changed in frequency and may have influenced responses to particular pathogens.
Human immune evolution also reflects the effects of archaic introgression. Some Neanderthal-derived immune haplotypes show signs of positive selection, suggesting that interbreeding introduced variants that were useful against pathogens encountered by modern humans.
Malaria and Genetic Adaptation
Malaria provides some of the clearest evidence of pathogen-driven human evolution. Several red-blood-cell genes contain variants associated with resistance to malaria or reduced severity of infection.
The Duffy-null variant affecting the ACKR1 gene became highly frequent in many African populations and provides protection against forms of malaria involving Plasmodium vivax. Research has identified strong natural-selection signals associated with this allele and has examined its spread through migration and admixture.
G6PD variants also provide evidence of malaria-related selection. Multiple forms of G6PD deficiency have arisen and persisted in populations where malaria has historically been common, illustrating how balancing selection can maintain variants that have both protective effects and health costs.
Glycophorin genes, which encode proteins used by malaria parasites to enter red blood cells, show extensive genetic and structural variation. Some of this variation is associated with resistance to severe malaria, highlighting the long evolutionary interaction between humans and malaria parasites.
Blood Groups and Disease
Human blood-group diversity may also reflect interactions with infectious disease. ABO blood groups differ in susceptibility to some infections, including differences in the severity of cholera.
Evolutionary models suggest that competing pathogen pressures may help maintain diversity in the ABO blood-group system. Instead of one blood type becoming universally advantageous, different disease environments may favor different variants.
Research into CCR5-Delta32 provides a cautionary example in interpreting adaptation. The allele can influence susceptibility to HIV, but studies have challenged earlier claims that its modern European distribution necessarily resulted from exceptionally strong historical selection by plague. Competing hypotheses have examined diseases such as smallpox and other demographic explanations.
Gene–Culture Coevolution
Many human adaptations cannot be understood by separating biology from culture. Cultural innovations change human environments and can create new selective pressures.
Dairying created selection favoring adult lactose digestion. Agriculture altered diet and infectious-disease exposure. Specialized diving created a distinct physiological environment. Settlement patterns changed pathogen transmission, while technologies allowed populations to enter climatic zones that might otherwise have been difficult to occupy.
This reciprocal relationship is described as gene–culture coevolution. Genes influence the characteristics of populations, while cultural behavior changes the environments in which genetic evolution occurs.
Human adaptation therefore involves feedback among inherited variation, ecological conditions, technology, social behavior, migration, demographic history, and cultural innovation.
Adaptation and Modern Health
Evolutionary adaptations are not necessarily universally beneficial. A variant that increased survival or reproductive success under historical conditions may have different consequences in a modern environment.
Changes in diet, physical activity, pathogen exposure, technology, settlement, and lifespan can alter the effects of previously adaptive characteristics. Research into human adaptation therefore contributes to evolutionary medicine by helping explain why some genetic traits associated with past advantages can also influence present-day disease susceptibility.
The effects of adaptive variants are frequently context dependent. Understanding their significance requires considering both the environment in which they evolved and the environment in which people live today.
Conclusion
Human adaptation reflects a long history of interaction among genetics, environment, culture, disease, diet, migration, and demographic change. Genomic and physiological studies show that humans have adapted to high altitude, tropical rainforests, marine diving, toxic environments, changing diets, climatic conditions, and persistent infectious diseases.
Adaptation can occur through strong selection on individual variants, coordinated changes across many genes, gene–environment interactions, physiological responses, cultural innovation, and genetic material inherited through archaic admixture. Different populations may develop distinct solutions to similar environmental challenges, emphasizing the diversity of human evolutionary history.
Ancient DNA and modern genomic technologies increasingly allow researchers to follow these processes through time. Together with archaeology, physiology, anthropology, and microbiome research, these approaches show that human adaptation is an ongoing and multifaceted process shaped by changing relationships among biology, culture, and environment.
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General Human Adaptation and Evolutionary Genomics
[Genomic insights into natural selection in recent human history | Pontus Skoglund and Iain Mathieson | Nature Reviews Genetics | 2026]
Reviews how ancient and present-day genomes reveal natural selection acting on human populations, including adaptations involving diet, immunity, pigmentation, and environmental conditions.
[Human adaptations to diet: Biological and cultural coevolution | Authors as listed | Advances in Food and Nutrition Research | 2024]
Examines gene-culture coevolution involving dairying, alcohol metabolism, plant-based diets, fatty-acid metabolism, agriculture, and changing human food systems.
[PMID:38858456 | Authors as listed | Nature Reviews Genetics | 2024]
Reviews genotype-by-environment interactions and explains how environmental exposures can alter the phenotypic consequences of inherited genetic variants.
[Human-specific genetics: new tools to explore the molecular and cellular basis of human evolution | Alex A. Pollen et al. | Nature Reviews Genetics | 2023]
Reviews genetic, cellular, and developmental changes that enabled humans to occupy diverse habitats, develop technologies, and acquire distinctive biological traits.
[PMID:36868214 | Sarah A. Tishkoff and colleagues | Cell | 2023]
Whole-genome sequencing of Indigenous African populations identifies local adaptation involving pigmentation, immune response, stature, and metabolism.
[PMID:36052370 | Authors as listed | bioRxiv / ancient-genome research | 2022]
Uses more than a thousand ancient European genomes to identify rapidly changing loci associated with diet, lipid metabolism, pigmentation, and immunity.
[Polygenic adaptation: a unifying framework to understand positive selection | Neda Barghi, Joachim Hermisson and Christian Schlötterer | Nature Reviews Genetics | 2020]
Explains how adaptation often involves coordinated changes across many genes rather than single mutations sweeping through a population.
[The Genomics of Human Local Adaptation | Authors as listed | Trends in Genetics | 2020]
Reviews genomic evidence for local human adaptation to climate, ultraviolet radiation, pathogens, diet, altitude, and cultural practices.
[PMID:32745952 | Iain Mathieson | Current Opinion in Genetics & Development | 2020]
Reviews genomic evidence for human adaptation during the last 40,000 years and explains how ancient DNA allows researchers to directly track changes in selected alleles through time.
[Human adaptation to extreme environmental conditions | Melissa Ilardo and Rasmus Nielsen | Current Opinion in Genetics & Development | 2018]
Reviews human adaptation to Arctic conditions, high altitude, and breath-hold diving as examples of biological responses to extreme environments.
[Harnessing ancient genomes to study the history of human adaptation | Stephanie Marciniak and George H. Perry | Nature Reviews Genetics | 2017]
Shows how ancient DNA allows researchers to follow adaptive genetic variants through time rather than inferring selection only from living populations.
[PMCID:PMC5360101 | Authors as listed | Human Genetics | 2017]
Reviews hunter-gatherer genomics and adaptive traits involving Arctic body form, rainforest stature, diet, metabolism, and pathogen exposure.
[Going global by adapting local: A review of recent human adaptation | Shaohua Fan et al. | Science | 2016]
Surveys human adaptations involving altitude, Arctic environments, diet, immunity, stature, and other pressures encountered during global dispersal.
[PMID:27185590 | Lluís Quintana-Murci | Comptes Rendus Biologies | 2016]
Reviews both genetic and epigenetic responses through which human populations have adapted to nutritional, climatic, and infectious environments.
[Evidence for archaic adaptive introgression in humans | Fernando Racimo et al. | Nature Reviews Genetics | 2015]
Reviews evidence that interbreeding with Neanderthals and Denisovans supplied modern humans with useful variants affecting immunity, metabolism, pigmentation, and altitude adaptation.
[PMID:26595274 | Iain Mathieson et al. | Nature | 2015]
Analyzes 230 ancient Eurasians and detects natural selection involving diet, pigmentation, immunity, and separate episodes affecting human height.
[Adaptations to local environments in modern human populations | Yair Field and colleagues / review authors as listed | Current Opinion in Genetics & Development | 2014]
Uses lactase persistence, pigmentation, and high-altitude biology to illustrate how similar environmental pressures can produce different genetic solutions.
[New frontiers in the study of human cultural and genetic evolution | Cody T. Ross and Peter J. Richerson | Current Opinion in Genetics & Development | 2014]
Discusses genomic evidence supporting reciprocal interactions among cultural change, behavior, environment, and biological evolution.
[Recent human adaptation: genomic approaches, interpretation and insights | Laura B. Scheinfeldt and Sarah A. Tishkoff | Nature Reviews Genetics | 2013]
Reviews genomic approaches for identifying human natural selection and emphasizes connecting candidate genetic signals with functional adaptive traits.
[Population Genomics of Human Adaptation | Joseph Lachance and Sarah A. Tishkoff | Annual Review / related review literature | 2013]
Discusses genome-wide methods used to identify natural selection associated with human environmental, dietary, and disease-related adaptations.
[PMID:23789027 | Lluís Quintana-Murci and colleagues | Evolutionary Applications | 2013]
Examines how dietary, climatic, and pathogen-driven natural selection shaped human diversity while sometimes creating modern susceptibility to disease.
[PMID:27896054 | George H. Perry | Advances in Genetics | 2013]
Examines how beneficial evolutionary adaptations can have unintended health consequences when environments or lifestyles subsequently change.
[PMCID:PMC3533238 | Authors as listed | BMC Genomics / review literature | 2012]
Reviews copy-number variation as a source of human adaptation, including changes affecting diet, immune function, smell, taste, and environmental sensing.
[PMID:22072984 | Matteo Fumagalli et al. | PLOS Genetics | 2011]
Correlates human allele frequencies with environmental variables and identifies pathogen diversity as an especially important historical selective pressure.
[Gene–Culture Coevolution in the Age of Genomics | Peter J. Richerson, Robert Boyd and Joseph Henrich | PNAS | 2010]
Explores how cultural innovations create new environments that can subsequently alter genetic selection pressures on human populations.
[PMID:20178769 | Jonathan K. Pritchard, Joseph K. Pickrell and Graham Coop | Current Biology | 2010]
Reviews hard selective sweeps, soft sweeps, and polygenic adaptation, arguing that many human adaptations may involve subtle changes at multiple loci rather than fixation of single new mutations.
[Positive Selection in the Human Genome: From Genome Scans to Biological Significance | Pardis C. Sabeti and colleagues / review authors | Annual Review of Genomics and Human Genetics | 2008]
Reviews evidence for positively selected human genes and the challenges of determining the biological significance of genomic selection signals.
Rainforest Adaptation and Body Size
[PMCID:PMC11808089 | Authors as listed | Scientific Reports | 2025]
Genome-wide analyses of Maniq rainforest hunter-gatherers identify selection involving immunity, metabolism, cardiovascular function, morphology, and sensory pathways.
[PMCID:PMC10859840 | Authors as listed | Human Genomics / evolutionary genetics literature | 2024]
Investigates a calcium-sensing receptor variant as a possible adaptive component of distinctive morphological traits among Southeast Asian rainforest hunter-gatherers.
[PMCID:PMC8970429 | Authors as listed | Molecular Biology and Evolution / related literature | 2022]
Examines independently evolved morphological characteristics among Southeast Asian rainforest populations, including stature, pigmentation, nasal form, and hair morphology.
[PMID:33846400 | Authors as listed | Journal of Human Evolution | 2021]
Uses modern humans and Upper Paleolithic fossils to investigate respiratory adaptations associated with cold and dry Eurasian environments.
[PMID:31402299 | Etienne Patin et al. | Current Biology | 2019]
Identifies selective sweeps and polygenic adaptation affecting stature, bone development, immune response, and pathogen defense among African rainforest hunter-gatherers.
[PMCID:PMC6275523 | Authors as listed | Proceedings of the National Academy of Sciences | 2018]
Detects convergent polygenic adaptation involving growth-factor and cardiac-development pathways in African and Asian rainforest hunter-gatherers.
[PMID:30008065 | Authors as listed | American Journal of Physical Anthropology | 2018]
Examines genetic regions associated with standing height, sitting height, leg length, and body-size differences between Central African hunter-gatherers and farmers.
[PMID:28301464 | Arslan A. Zaidi et al. | PLOS Genetics | 2017]
Finds that differences in human nostril width correlate with temperature and absolute humidity, supporting a contribution from climatic adaptation.
[PMID:27374937 | Authors as listed | American Journal of Physical Anthropology | 2016]
Reassesses global nasal variation using absolute humidity and clarifies the respiratory demands imposed by different climatic environments.
[DOI:10.1038/ncomms10047 | Authors as listed | Nature Communications | 2015]
Compares DNA methylation in African rainforest hunter-gatherers and farmers and finds interactions among environment, lifestyle, ancestry, and regulatory variation.
[PMID:25136101 | George H. Perry et al. | Proceedings of the National Academy of Sciences | 2014]
Finds evidence that short stature among African rainforest hunter-gatherers has an adaptive and partially convergent evolutionary origin.
[DOI:10.1038/ncomms4163 | Etienne Patin et al. | Nature Communications | 2014]
Reconstructs admixture between Central African farmers and rainforest hunter-gatherers following the expansion of agriculture into equatorial forests.
[DOI:10.1038/ejhg.2012.223 | Noémie S. A. Becker et al. | European Journal of Human Genetics | 2013]
Finds evidence that GHR and IGF1 variation contributes to the genetic architecture of reduced stature in Baka rainforest hunter-gatherers.
[PMID:21660932 | Nathan Holton and colleagues | American Journal of Physical Anthropology | 2011]
Shows that human nasal-cavity morphology varies systematically with temperature and humidity in ways consistent with conditioning inhaled air.
[PMID:9712477 | Christopher B. Ruff | American Journal of Physical Anthropology | 1998]
Finds global correlations between climate and human body mass, limb proportions, and surface-area-to-mass ratios while also documenting substantial secular change.
Diet, Subsistence, and Gene–Culture Coevolution
[PMID:41433046 | Alessia Ranciaro | Journal of Anthropological Sciences | 2025]
Reviews lactase persistence across Africa as a record of pastoralism, migration, environmental adaptation, and gene-culture coevolution.
[PMID:39788100 | Shahar Silverman and Diyendo Massilani | Cell Genomics | 2025]
Discusses high-resolution reconstruction of the amylase locus and how ancient duplications supplied variation later used in dietary adaptation.
[PMID:38077078 | Authors as listed | bioRxiv / genomic research | 2023]
Reconstructs ancient duplications at the human amylase locus and argues that structural variation long predates agriculture.
[PMCID:PMC10317983 | Authors as listed | Molecular Biology and Evolution | 2023]
Compares olfactory and taste receptor genes in rainforest foragers and farmers and identifies subsistence-associated local adaptation in chemosensory genes.
[PMID:35896751 | Richard P. Evershed et al. | Nature | 2022]
Combines archaeological milk residues, ancient genetics, and demographic modeling to investigate why lactase persistence became strongly selected in Europe.
[PMID:33847744 | Michael C. Campbell and Alessia Ranciaro | Human Molecular Genetics | 2021]
Reviews the complex relationship among cattle domestication, migration, admixture, dairying, and lactase-persistence alleles across Africa.
[PMID:34138633 | Herman Pontzer and colleagues | Annual Review of Nutrition | 2021]
Reviews how ecology, food availability, technology, and subsistence economies shaped the unusually flexible human diet.
[PMID:32888485 | Joachim Burger et al. | Current Biology | 2020]
Finds low lactase-persistence frequencies in Bronze Age Europeans, demonstrating that strong selection continued surprisingly recently.
[PMID:31524305 | Katherine R. Amato et al. | BioEssays | 2019]
Explores how the gut microbiome may have buffered humans against changing diets, climates, and infectious environments during evolution.
[PMID:28426286 | Laure Ségurel and Céline Bon | Annual Review of Genomics and Human Genetics | 2017]
Reviews the multiple independent genetic origins of adult lactase persistence and its relationship with dairying and pastoralist cultures.
[PMID:28568243 | Authors as listed | American Journal of Physical Anthropology | 2017]
Reassesses the hypothesis that high AMY1 copy number evolved principally as an adaptation to starch-rich diets and discusses alternative selective explanations.
[PMID:28105723 | Alyssa N. Crittenden and Stephanie L. Schnorr | American Journal of Physical Anthropology | 2017]
Reviews hunter-gatherer diet and nutrition as evidence for the diversity and flexibility of human subsistence adaptation.
[PMID:25401983 | Authors as listed | Human Biology | 2014]
Examines a distinct Arabian lactase-persistence allele and traces its later movement into African pastoralist populations.
[PMID:25408692 | Simone Rampelli and colleagues | Environmental Microbiology | 2014]
Describes the gut microbiome as an adaptive system responding to environmental and dietary changes across individual and evolutionary timescales.
[PMID:19714206 | Pascale Gerbault et al. | PLOS Computational Biology | 2009]
Uses spatial simulations to reconstruct the spread of European dairying and the strongly selected lactase-persistence allele.
High Altitude, Diving, and Toxic Environments
[PMID:41655047 | Authors as listed | High Altitude Medicine & Biology / related literature | 2026]
Links selected EPAS1 and EGLN1 variants in Sherpas with altered gene expression despite chronic high-altitude hypoxia.
[PMID:30475063 | Fumiya Kinota et al. | High Altitude Medicine & Biology | 2023]
Investigates PPARA variants in Sherpas and their possible contribution to metabolic adaptation under chronic hypoxia.
[PMID:35177992 | Melissa Ilardo and colleagues | Cell Reports Medicine / related literature | 2022]
Investigates the physiological mechanism connecting PDE10A-related thyroid signaling with the enlarged spleens and oxygen-storage capacity of Bajau sea nomads.
[PMID:31555147 | Authors as listed | Frontiers in Physiology / review literature | 2019]
Reviews Sherpa population history together with genetic, reproductive, hematological, and physiological adaptations to high altitude.
[PMID:30335146 | Authors as listed | Genome Biology and Evolution | 2018]
Finds evidence for polygenic adaptation of angiogenesis and tissue-perfusion pathways in Tibetan and Sherpa highlanders.
[PMID:30369007 | Bernardo Arriaza and colleagues | American Journal of Human Biology | 2018]
Combines archaeological and biological evidence to examine human exposure and adaptation to naturally arsenic-rich environments in the Atacama Desert.
[PMID:28116332 | Authors as listed | Journal of Human Genetics | 2017]
Shows that Sherpas and Tibetans share selected EPAS1 and EGLN1 variants associated with lower hemoglobin concentrations at altitude.
[PMID:28533386 | Andrew J. Murray et al. | Proceedings of the National Academy of Sciences | 2017]
Identifies metabolic characteristics in Sherpas that improve oxygen-use efficiency and protect muscle energetics during hypoxia.
[PMID:28206677 | Mario Apata et al. | American Journal of Physical Anthropology | 2017]
Finds unusually high frequencies of protective AS3MT variants among populations with thousands of years of exposure to arsenic-rich water in Chile's Atacama Desert.
[PMID:24201705 | Nayia Petousi and Peter A. Robbins | Journal of Applied Physiology | 2014]
Reviews Tibetan altitude adaptation from classic physiological research through modern genomic discoveries involving EPAS1 and EGLN1.
[PMID:25319824 | Frank S. Lee and colleagues | Genes & Development | 2014]
Connects human high-altitude genetic studies with the hypoxia-inducible factor pathway and mechanisms of oxygen sensing.
[PMID:25225183 | Authors as listed | Physiological Genomics | 2014]
Links maternal PRKAA1 and EDNRA genetic variation with uterine blood flow, birth weight, and reproductive adaptation among Andean highlanders.
[PMID:23348729 | Abigail W. Bigham and colleagues | American Journal of Human Biology | 2013]
Compares Andean and Tibetan high-altitude adaptation and shows that the same environmental stress can produce different genotype-phenotype relationships.
[PMID:19244584 | Lorna G. Moore and colleagues | American Journal of Physiology | 2009]
Shows that enhanced uterine blood flow and oxygen delivery help protect fetal growth in Andean women living at high altitude.
[PMID:12471159 | Cynthia M. Beall et al. | Proceedings of the National Academy of Sciences | 2002]
Documents a distinctive Ethiopian high-altitude phenotype in which hemoglobin concentration and oxygen saturation remain unusually close to sea-level values.
Archaic Introgression and Adaptation
[PMID:41545083 | Authors as listed | Annual Review / evolutionary-genomics literature | 2026]
Reviews recent computational methods for identifying and characterizing archaic introgression in modern human genomes.
[PMID:39577372 | Debashree Tagore and Joshua M. Akey | Current Opinion in Genetics & Development | 2025]
Reviews the molecular and phenotypic consequences of Neanderthal and Denisovan ancestry retained in living human populations.
[PMID:34284881 | Edward J. Hollox, Luciana W. Zuccherato and Serena Tucci | Trends in Genetics | 2022]
Reviews structural genomic variation involved in adaptation to diet, infectious disease, human-specific traits, and archaic admixture.
[PMID:36480515 | Authors as listed | PLOS Genetics | 2022]
Shows that Denisovan-derived regulatory variants have particularly strong effects on immune-cell function in present-day Papuan populations.
[PMID:34662402 | Authors as listed | Molecular Biology and Evolution | 2021]
Experimentally identifies Neanderthal-derived regulatory variants that alter gene expression in modern human immune cells.
[PMID:31702050 | Serena Tucci | Current Opinion in Genetics & Development | 2020]
Reviews multiple Neanderthal, Denisovan, and possible unidentified archaic introgression events affecting present-day human genomes.
[PMID:29894925 | Authors as listed | Human Genetics | 2018]
Reviews how interbreeding with Neanderthals and Denisovans contributed potentially useful genetic variation to modern human populations.
[PMID:30022013 | Authors as listed | Current Opinion in Genetics & Development | 2018]
Examines both beneficial and harmful consequences of archaic introgression for modern human fitness and disease.
[PMID:29852022 | Authors as listed | PLOS Genetics | 2018]
Reviews unresolved questions concerning how selection and genetic drift determined which archaic DNA segments survived in modern humans.
[PMID:29220488 | Authors as listed | Molecular Biology and Evolution | 2018]
Distinguishes immediate adaptive introgression from later natural selection acting on archaic variants that initially persisted neutrally.
[PMID:30290142 | David Enard and Dmitri A. Petrov | Cell | 2018]
Finds enrichment of Neanderthal ancestry at genes interacting with RNA viruses, suggesting ancient viral epidemics helped favor some introgressed alleles.
[PMID:27756828 | Fernando Racimo, Davide Marnetto and Emilia Huerta-Sánchez | Molecular Biology and Evolution | 2017]
Develops methods for distinguishing true adaptive archaic introgression from genomic patterns produced simply by ancient admixture.
[PMID:27899133 | Authors as listed | Genome Biology | 2016]
Demonstrates positive selection on a Neanderthal-derived OAS immune haplotype and identifies functional consequences for antiviral innate immunity.
[PMID:27662059 | Authors as listed | Current Opinion in Genetics & Development | 2016]
Summarizes evidence for repeated admixture between modern humans, Neanderthals, and Denisovans and its importance to human evolutionary history.
[PMID:27768888 | Hélène Quach et al. | Cell | 2016]
Demonstrates that natural selection and Neanderthal admixture contributed to present-day population differences in human immune responses.
Pathogens, Immunity, and Human Adaptation
[PMID:41881027 | Authors as listed | Human Genetics / population-genomics literature | 2026]
Finds evidence that African-derived Duffy-null ancestry increased at the ACKR1 locus in Oman, consistent with adaptive admixture associated with malaria resistance.
[PMID:42039401 | Javier Maravall-López et al. | bioRxiv | 2026]
Uses ancient genomes and modern functional data to investigate how natural selection increasingly favored immune variants associated with resistance to infectious diseases during the last 10,000 years.
[PMID:39705165 | Authors as listed | Annual Review of Immunology | 2025]
Reviews ancient-DNA evidence showing how epidemics, archaic admixture, and cultural transitions altered the evolution of human immunity.
[PMID:36824277 | Authors as listed | iScience | 2023]
Finds strong immune-selection signals related to tuberculosis in Indigenous Ecuadorian highlanders, potentially predating European contact.
[PMID:36261521 | Jennifer Klunk et al. | Nature | 2022]
Reports natural selection at immune loci around the time of the Black Death, including an ERAP2 variant influencing macrophage responses to Yersinia pestis.
[PMID:32600246 | Authors as listed | BMC Genomics | 2020]
Characterizes extensive structural variation in the human glycophorin gene cluster, including variants associated with resistance to severe malaria.
[PMID:32094538 | Felix M. Key et al. | Nature Ecology & Evolution | 2020]
Uses ancient bacterial genomes to show that the Neolithic transition contributed to the emergence and evolution of human-adapted Salmonella lineages.
[PMID:31358949 | Luis B. Barreiro and colleagues | Nature Ecology & Evolution | 2019]
Shows that the transition from hunting and gathering to agriculture contributed to genetically influenced differences in human immune responses.
[PMID:29285966 | Authors as listed | Annual Review of Anthropology | 2018]
Examines how infectious disease pressures contributed to diversification of the human genome while emphasizing the complexity of interpreting immune selection.
[PMID:29763671 | Authors as listed | Scientific Reports / ancient-DNA literature | 2018]
Uses historical DNA from Poland to examine changes in innate-immune alleles associated with susceptibility to mycobacterial infections.
[PMID:28282382 | Authors as listed | PLOS Genetics | 2017]
Reconstructs the history of the Duffy-null allele and concludes that resistance to Plasmodium vivax drove one of the strongest known selective events in humans.
[PMID:24776769 | Elinor K. Karlsson, Dominic P. Kwiatkowski and Pardis C. Sabeti | Nature Reviews Genetics | 2014]
Reviews how infectious diseases drove natural selection in human populations and how these ancient adaptations affect present-day disease susceptibility.
[PMID:24880709 | Matteo Fumagalli and Manuela Sironi | Current Opinion in Immunology | 2014]
Reviews genomic evidence showing that immune genes have been repeatedly targeted by pathogen-mediated natural selection.
[PMID:25170983 | Authors as listed | Current Opinion in Genetics & Development | 2014]
Describes the long evolutionary arms race between human populations and pathogens such as malaria and cholera.
[PMID:24990677 | Authors as listed | Proceedings of the Royal Society B | 2014]
Shows strong evidence that natural selection increased the frequency of the malaria-protective Duffy-null allele in recently admixed Malagasy populations.
[PMID:22312055 | Authors as listed | Philosophical Transactions of the Royal Society B | 2012]
Reviews how population structure, pathogen history, and resistance mechanisms interact during human adaptation to infectious disease.
[PMID:21664997 | Wen-Ya Ko et al. | American Journal of Human Genetics | 2011]
Finds natural selection and gene conversion acting on human glycophorin genes used by malaria parasites to invade red blood cells.
[PMID:19679754 | Authors as listed | Molecular Biology and Evolution | 2009]
Finds accelerated evolution and positive selection at GYPC, a human red-cell protein exploited by Plasmodium falciparum during infection.
[PMID:16678299 | Philip W. Hedrick and Brian C. Verrelli | Trends in Genetics | 2006]
Reviews ancient and population-genetic evidence challenging simple stories of plague-driven selection on CCR5-Delta32.
[PMID:16248677 | Pardis C. Sabeti et al. | PLOS Biology | 2005]
Reassesses claims that the HIV-protective CCR5-Delta32 allele underwent exceptionally strong recent selection in Europe.
[PMID:15293861 | Robert M. Seymour et al. | Proceedings of the Royal Society B | 2004]
Models how competing pathogen-driven selective pressures may help maintain the remarkable diversity of the human ABO blood-group system.
[PMID:14645720 | Alison P. Galvani and Montgomery Slatkin | Proceedings of the National Academy of Sciences | 2003]
Models whether historical smallpox or plague epidemics could explain the European distribution of the CCR5-Delta32 resistance allele.
[PMID:12524354 | Michael A. Saunders et al. | Genetics | 2002]
Uses DNA sequence variation at G6PD to investigate the evolutionary history of malaria-protective enzyme-deficiency alleles.
[PMID:12378426 | Brian C. Verrelli et al. | American Journal of Human Genetics | 2002]
Finds molecular evidence that balancing selection has maintained multiple G6PD variants associated with malaria resistance.
[PMID:4014172 | Roger I. Glass et al. | American Journal of Epidemiology | 1985]
Finds strong differences in cholera severity among ABO blood groups and discusses the possible evolutionary consequences of repeated cholera epidemics.
