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词条 Human genetic variation
释义

  1. Causes of variation

  2. Measures of variation

      Single nucleotide polymorphisms    Structural variation    Copy number variation    Epigenetics    Genetic variability    Clines    Haplogroups    Variable number tandem repeats  

  3. History and geographic distribution

     Recent African origin of modern humans   Population genetics    Distribution of variation   Phenotypic variation   Wright's Fixation index as measure of variation    Archaic admixture  

  4. Categorization of the world population

      Genetic clustering    Forensic anthropology    Gene flow and admixture  

  5. Health

  6. Genome projects

  7. See also

  8. References

  9. Further reading

  10. External links

{{Use dmy dates|date=July 2013}}

Human genetic variation is the genetic differences in and among populations. There may be multiple variants of any given gene in the human population (alleles), a situation called polymorphism.

No two humans are genetically identical. Even monozygotic twins (who develop from one zygote) have infrequent genetic differences due to mutations occurring during development and gene copy-number variation.[1] Differences between individuals, even closely related individuals, are the key to techniques such as genetic fingerprinting.

As of 2017, there are a total of 324 million known variants from sequenced human genomes.[2]

As of 2015, the typical difference between the genomes of two individuals was estimated at 20 million base pairs (or 0.6% of the total of 3.2 billion base pairs).[3]

Alleles occur at different frequencies in different human populations. Populations that are more geographically and ancestrally remote tend to differ more. The differences between populations represent a small proportion of overall human genetic variation. Populations also differ in the quantity of variation among their members.

The greatest divergence between populations is found in sub-Saharan Africa, consistent with the recent African origin of non-African populations.

Populations also vary in the proportion and locus of introgressed genes they received by archaic admixture both inside and outside of Africa.

The study of human genetic variation has evolutionary significance and medical applications. It can help scientists understand ancient human population migrations as well as how human groups are biologically related to one another. For medicine, study of human genetic variation may be important because some disease-causing alleles occur more often in people from specific geographic regions. New findings show that each human has on average 60 new mutations compared to their parents.[2][3]

Causes of variation

{{see|Recent human evolution}}

Causes of differences between individuals include independent assortment, the exchange of genes (crossing over and recombination) during reproduction (through meiosis) and various mutational events.

There are at least three reasons why genetic variation exists between populations. Natural selection may confer an adaptive advantage to individuals in a specific environment if an allele provides a competitive advantage. Alleles under selection are likely to occur only in those geographic regions where they confer an advantage. A second important process is genetic drift, which is the effect of random changes in the gene pool, under conditions where most mutations are neutral (that is, they do not appear to have any positive or negative selective effect on the organism). Finally, small migrant populations have statistical differences—call the founder effect—from the overall populations where they originated; when these migrants settle new areas, their descendant population typically differs from their population of origin: different genes predominate and it is less genetically diverse.

In humans, the main cause{{Citation needed|date=June 2018}} is genetic drift. Serial founder effects and past small population size (increasing the likelihood of genetic drift) may have had an important influence in neutral differences between populations. {{citation needed|date=February 2015}} The second main cause of genetic variation is due to the high degree of neutrality of most mutations. A small, but significant number of genes appear to have undergone recent natural selection, and these selective pressures are sometimes specific to one region.[4][5]

Measures of variation

Genetic variation among humans occurs on many scales, from gross alterations in the human karyotype to single nucleotide changes.[6] Chromosome abnormalities are detected in 1 of 160 live human births. Apart from sex chromosome disorders, most cases of aneuploidy result in death of the developing fetus (miscarriage); the most common extra autosomal chromosomes among live births are 21, 18 and 13.[7]

Nucleotide diversity is the average proportion of nucleotides that differ between two individuals. As of 2004, the human nucleotide diversity was estimated to be 0.1%[8] to 0.4% of base pairs.[9] In 2015, the 1000 Genomes Project, which sequenced one thousand individuals from 26 human populations, found that "a typical [individual] genome differs from the reference human genome at 4.1 million to 5.0 million sites … affecting 20 million bases of sequence"; the latter figure corresponds to 0.6% of total number of base pairs.[10] Nearly all (>99.9%) of these sites are small differences, either single nucleotide polymorphisms or brief insertions or deletions (indels) in the genetic sequence, but structural variations account for a greater number of base-pairs than the SNPs and indels.[10][11]{{As of|2017}}, the Single Nucleotide Polymorphism Database (dbSNP), which lists SNP and other variants, listed 324 million variants found in sequenced human genomes.[12]

Single nucleotide polymorphisms

{{Main|Single nucleotide polymorphism}}

A single nucleotide polymorphism (SNP) is a difference in a single nucleotide between members of one species that occurs in at least 1% of the population. The 2,504 individuals characterized by the 1000 Genomes Project had 84.7 million SNPs among them.[10] SNPs are the most common type of sequence variation, estimated in 1998 to account for 90% of all sequence variants.[13] Other sequence variations are single base exchanges, deletions and insertions.[14] SNPs occur on average about every 100 to 300 bases[15] and so are the major source of heterogeneity.

A functional, or non-synonymous, SNP is one that affects some factor such as gene splicing or messenger RNA, and so causes a phenotypic difference between members of the species. About 3% to 5% of human SNPs are functional (see International HapMap Project). Neutral, or synonymous SNPs are still useful as genetic markers in genome-wide association studies, because of their sheer number and the stable inheritance over generations.[13]

A coding SNP is one that occurs inside a gene. There are 105 Human Reference SNPs that result in premature stop codons in 103 genes. This corresponds to 0.5% of coding SNPs. They occur due to segmental duplication in the genome. These SNPs result in loss of protein, yet all these SNP alleles are common and are not purified in negative selection.[16]

Structural variation

{{Main|Structural variation}}Structural variation is the variation in structure of an organism's chromosome. Structural variations, such as copy-number variation and deletions, inversions, insertions and duplications, account for much more human genetic variation than single nucleotide diversity. This was concluded in 2007 from analysis of the diploid full sequences of the genomes of two humans: Craig Venter and James D. Watson. This added to the two haploid sequences which were amalgamations of sequences from many individuals, published by the Human Genome Project and Celera Genomics respectively.[17]

According to the 1000 Genomes Project, a typical human has 2,100 to 2,500 structural variations, which include approximately 1,000 large deletions, 160 copy-number variants, 915 Alu insertions, 128 L1 insertions, 51 SVA insertions, 4 NUMTs, and 10 inversions.[10]

Copy number variation

{{Main|Copy number variation}}

A copy-number variation (CNV) is a difference in the genome due to deleting or duplicating large regions of DNA on some chromosome. It is estimated that 0.4% of the genomes of unrelated humans differ with respect to copy number. When copy number variation is included, human-to-human genetic variation is estimated to be at least 0.5% (99.5% similarity).[18][19][20][21] Copy number variations are inherited but can also arise during development.[22][23][24][25]

A visual map with the regions with high genomic variation of the modern-human reference assembly relatively to a

Neanderthal of 50k [26] has been built by Pratas et al.[27]

Epigenetics

Epigenetic variation is variation in the chemical tags that attach to DNA and affect how genes get read. The tags, "called epigenetic markings, act as switches that control how genes can be read."[28] At some alleles, the epigenetic state of the DNA, and associated phenotype, can be inherited across generations of individuals.[29]

Genetic variability

{{Main|Genetic variability}}

Genetic variability is a measure of the tendency of individual genotypes in a population to vary (become different) from one another. Variability is different from genetic diversity, which is the amount of variation seen in a particular population. The variability of a trait is how much that trait tends to vary in response to environmental and genetic influences.

Clines

{{Main|Cline (biology)}}

In biology, a cline is a continuum of species, populations, races, varieties, or forms of organisms that exhibit gradual phenotypic and/or genetic differences over a geographical area, typically as a result of environmental heterogeneity.[30][31][32] In the scientific study of human genetic variation, a gene cline can be rigorously defined and subjected to quantitative metrics.

Haplogroups

{{Main|Haplogroup}}

In the study of molecular evolution, a haplogroup is a group of similar haplotypes that share a common ancestor with a single nucleotide polymorphism (SNP) mutation. Haplogroups pertain to deep ancestral origins dating back thousands of years.[33]

The most commonly studied human haplogroups are Y-chromosome (Y-DNA) haplogroups and mitochondrial DNA (mtDNA) haplogroups, both of which can be used to define genetic populations. Y-DNA is passed solely along the patrilineal line, from father to son, while mtDNA is passed down the matrilineal line, from mother to both daughter or son. The Y-DNA and mtDNA may change by chance mutation at each generation.

Variable number tandem repeats

{{Main|Variable number tandem repeat}}

A variable number tandem repeat (VNTR) is the variation of length of a tandem repeat. A tandem repeat is the adjacent repetition of a short nucleotide sequence. Tandem repeats exist on many chromosomes, and their length varies between individuals. Each variant acts as an inherited allele, so they are used for personal or parental identification. Their analysis is useful in genetics and biology research, forensics, and DNA fingerprinting.

Short tandem repeats (about 5 base pairs) are called microsatellites, while longer ones are called minisatellites.

History and geographic distribution

{{See also|Human evolutionary genetics#Modern humans|Recent human evolution}}

Recent African origin of modern humans

The recent African origin of modern humans paradigm assumes the dispersal of non-African populations of anatomically modern humans after 70,000 years ago. Dispersal within Africa occurred significantly earlier, at least 130,000 years ago. The "out of Africa" theory originates in the 19th century, as a tentative suggestion in Charles Darwin's Descent of Man,[34] but remained speculative until the 1980s when it was supported by study of present-day mitochondrial DNA, combined with evidence from physical anthropology of archaic specimens.

According to a 2000 study of Y-chromosome sequence variation,[35] human Y-chromosomes trace ancestry to Africa, and the descendants of the derived lineage left Africa and eventually were replaced by archaic human Y-chromosomes in Eurasia. The study also shows that a minority of contemporary populations in East Africa and the Khoisan are the descendants of the most ancestral patrilineages of anatomically modern humans that left Africa 35,000 to 89,000 years ago.[35] Other evidence supporting the theory is that variations in skull measurements decrease with distance from Africa at the same rate as the decrease in genetic diversity. Human genetic diversity decreases in native populations with migratory distance from Africa, and this is thought to be due to bottlenecks during human migration, which are events that temporarily reduce population size.[36][37]

A 2009 genetic clustering study, which genotyped 1327 polymorphic markers in various African populations, identified six ancestral clusters. The clustering corresponded closely with ethnicity, culture and language.[38] A 2018 whole genome sequencing study of the world's populations observed similar clusters among the populations in Africa. At K=9, distinct ancestral components defined the Afroasiatic-speaking populations inhabiting North Africa and Northeast Africa; the Nilo-Saharan-speaking populations in Northeast Africa and East Africa; the Ari populations in Northeast Africa; the Niger-Congo-speaking populations in West-Central Africa, West Africa, East Africa and Southern Africa; the Pygmy populations in Central Africa; and the Khoisan populations in Southern Africa.[39]

Population genetics

{{See also|Population genetics}}

Because of the common ancestry of all humans, only a small number of variants have large differences in frequency between populations. However, some rare variants in the world's human population are much more frequent in at least one population (more than 5%).[40]

It is commonly assumed that early humans left Africa, and thus must have passed through a population bottleneck before their African-Eurasian divergence around 100,000 years ago (ca. 3,000 generations). The rapid expansion of a previously small population has two important effects on the distribution of genetic variation. First, the so-called founder effect occurs when founder populations bring only a subset of the genetic variation from their ancestral population. Second, as founders become more geographically separated, the probability that two individuals from different founder populations will mate becomes smaller. The effect of this assortative mating is to reduce gene flow between geographical groups and to increase the genetic distance between groups.{{Citation needed|date=December 2017}}

The expansion of humans from Africa affected the distribution of genetic variation in two other ways. First, smaller (founder) populations experience greater genetic drift because of increased fluctuations in neutral polymorphisms. Second, new polymorphisms that arose in one group were less likely to be transmitted to other groups as gene flow was restricted.{{Citation needed|date=December 2017}}

Populations in Africa tend to have lower amounts of linkage disequilibrium than do populations outside Africa, partly because of the larger size of human populations in Africa over the course of human history and partly because the number of modern humans who left Africa to colonize the rest of the world appears to have been relatively low.[41] In contrast, populations that have undergone dramatic size reductions or rapid expansions in the past and populations formed by the mixture of previously separate ancestral groups can have unusually high levels of linkage disequilibrium[41]

Distribution of variation

The distribution of genetic variants within and among human populations are impossible to describe succinctly because of the difficulty of defining a "population," the clinal nature of variation, and heterogeneity across the genome (Long and Kittles 2003). In general, however, an average of 85% of genetic variation exists within local populations, ~7% is between local populations within the same continent, and ~8% of variation occurs between large groups living on different continents.[50][42] The recent African origin theory for humans would predict that in Africa there exists a great deal more diversity than elsewhere and that diversity should decrease the further from Africa a population is sampled.

Phenotypic variation

{{Details|Phenotype#Phenotypic_variation}}

Sub-Saharan Africa has the most human genetic diversity and the same has been shown to hold true for phenotypic variation in skull form.[36][43] Phenotype is connected to genotype through gene expression. Genetic diversity decreases smoothly with migratory distance from that region, which many scientists believe to be the origin of modern humans, and that decrease is mirrored by a decrease in phenotypic variation. Skull measurements are an example of a physical attribute whose within-population variation decreases with distance from Africa.

The distribution of many physical traits resembles the distribution of genetic variation within and between human populations (American Association of Physical Anthropologists 1996; Keita and Kittles 1997). For example, ~90% of the variation in human head shapes occurs within continental groups, and ~10% separates groups, with a greater variability of head shape among individuals with recent African ancestors (Relethford 2002).

A prominent exception to the common distribution of physical characteristics within and among groups is skin color. Approximately 10% of the variance in skin color occurs within groups, and ~90% occurs between groups (Relethford 2002). This distribution of skin color and its geographic patterning — with people whose ancestors lived predominantly near the equator having darker skin than those with ancestors who lived predominantly in higher latitudes — indicate that this attribute has been under strong selective pressure. Darker skin appears to be strongly selected for in equatorial regions to prevent sunburn, skin cancer, the photolysis of folate, and damage to sweat glands.[44]

Understanding how genetic diversity in the human population impacts various levels of gene expression is an active area of research. While earlier studies focused on the relationship between DNA variation and RNA expression, more recent efforts are characterizing the genetic control of various aspects of gene expression including chromatin states,[45] translation,[46] and protein levels.[47] A study published in 2007 found that 25% of genes showed different levels of gene expression between populations of European and Asian descent.[48][49][50][51][52] The primary cause of this difference in gene expression was thought to be SNPs in gene regulatory regions of DNA. Another study published in 2007 found that approximately 83% of genes were expressed at different levels among individuals and about 17% between populations of European and African descent.[53][54]

Wright's Fixation index as measure of variation

The population geneticist Sewall Wright developed the fixation index (often abbreviated to FST) as a way of measuring genetic differences between populations. This statistic is often used in taxonomy to compare differences between any two given populations by measuring the genetic differences among and between populations for individual genes, or for many genes simultaneously.[55] It is often stated that the fixation index for humans is about 0.15. This translates to an estimated 85% of the variation measured in the overall human population is found within individuals of the same population, and about 15% of the variation occurs between populations. These estimates imply that any two individuals from different populations are almost as likely to be more similar to each other than either is to a member of their own group.[56][57]

Wright himself believed that values >0.25 represent very great genetic variation and that an FST of 0.15–0.25 represented great variation. However, about 5% of human variation occurs between populations within continents, therefore FST values between continental groups of humans (or races) of as low as 0.1 (or possibly lower) have been found in some studies, suggesting more moderate levels of genetic variation.[55] Graves (1996) has countered that FST should not be used as a marker of subspecies status, as the statistic is used to measure the degree of differentiation between populations,[55] although see also Wright (1978).[59]

Jeffrey Long and Rick Kittles give a long critique of the application of FST to human populations in their 2003 paper "Human Genetic Diversity and the Nonexistence of Biological Races". They find that the figure of 85% is misleading because it implies that all human populations contain on average 85% of all genetic diversity. They argue the underlying statistical model incorrectly assumes equal and independent histories of variation for each large human population. A more realistic approach is to understand that some human groups are parental to other groups and that these groups represent paraphyletic groups to their descent groups. For example, under the recent African origin theory the human population in Africa is paraphyletic to all other human groups because it represents the ancestral group from which all non-African populations derive, but more than that, non-African groups only derive from a small non-representative sample of this African population. This means that all non-African groups are more closely related to each other and to some African groups (probably east Africans) than they are to others, and further that the migration out of Africa represented a genetic bottleneck, with much of the diversity that existed in Africa not being carried out of Africa by the emigrating groups. Under this scenario, human populations do not have equal amounts of local variability, but rather diminished amounts of diversity the further from Africa any population lives. Long and Kittles find that rather than 85% of human genetic diversity existing in all human populations, about 100% of human diversity exists in a single African population, whereas only about 70% of human genetic diversity exists in a population derived from New Guinea. Long and Kittles argued that this still produces a global human population that is genetically homogeneous compared to other mammalian populations.[60]

Archaic admixture

{{Main|Archaic human admixture with modern humans}}

There is a hypothesis that anatomically modern humans interbred with Neanderthals during the Middle Paleolithic. In May 2010, the Neanderthal Genome Project presented genetic evidence that interbreeding did likely take place and that a small but significant{{how|date=November 2012}} portion of Neanderthal admixture is present in the DNA of modern Eurasians and Oceanians, and nearly absent in sub-Saharan African populations.

Between 4% and 6% of the genome of Melanesians (represented by the Papua New Guinean and Bougainville Islander) are thought to derive from Denisova hominins – a previously unknown species which shares a common origin with Neanderthals. It was possibly introduced during the early migration of the ancestors of Melanesians into Southeast Asia. This history of interaction suggests that Denisovans once ranged widely over eastern Asia.[61]

Thus, Melanesians emerge as the most archaic-admixed population, having Denisovan/Neanderthal-related admixture of ~8%.[61]

In a study published in 2013, Jeffrey Wall from University of California studied whole sequence-genome data and found higher rates of introgression in Asians compared to Europeans.[62] Hammer et al. tested the hypothesis that contemporary African genomes have signatures of gene flow with archaic human ancestors and found evidence of archaic admixture in African genomes, suggesting that modest amounts of gene flow were widespread throughout time and space during the evolution of anatomically modern humans.[63]

Categorization of the world population

{{See also|Race (human classification)|Race and genetics}}

New data on human genetic variation has reignited the debate about a possible biological basis for categorization of humans into races. Most of the controversy surrounds the question of how to interpret the genetic data and whether conclusions based on it are sound. Some researchers argue that self-identified race can be used as an indicator of geographic ancestry for certain health risks and medications.

Although the genetic differences among human groups are relatively small, these differences in certain genes such as duffy, ABCC11, SLC24A5, called ancestry-informative markers (AIMs) nevertheless can be used to reliably situate many individuals within broad, geographically based groupings. For example, computer analyses of hundreds of polymorphic loci sampled in globally distributed populations have revealed the existence of genetic clustering that roughly is associated with groups that historically have occupied large continental and subcontinental regions (Rosenberg et al. 2002; Bamshad et al. 2003).

Some commentators have argued that these patterns of variation provide a biological justification for the use of traditional racial categories. They argue that the continental clusterings correspond roughly with the division of human beings into sub-Saharan Africans; Europeans, Western Asians, Central Asians, Southern Asians and Northern Africans; Eastern Asians, Southeast Asians, Polynesians and Native Americans; and other inhabitants of Oceania (Melanesians, Micronesians & Australian Aborigines) (Risch et al. 2002). Other observers disagree, saying that the same data undercut traditional notions of racial groups (King and Motulsky 2002; Calafell 2003; Tishkoff and Kidd 2004[9]). They point out, for example, that major populations considered races or subgroups within races do not necessarily form their own clusters.

Furthermore, because human genetic variation is clinal, many individuals affiliate with two or more continental groups. Thus, the genetically based "biogeographical ancestry" assigned to any given person generally will be broadly distributed and will be accompanied by sizable uncertainties (Pfaff et al. 2004).

In many parts of the world, groups have mixed in such a way that many individuals have relatively recent ancestors from widely separated regions. Although genetic analyses of large numbers of loci can produce estimates of the percentage of a person's ancestors coming from various continental populations (Shriver et al. 2003; Bamshad et al. 2004), these estimates may assume a false distinctiveness of the parental populations, since human groups have exchanged mates from local to continental scales throughout history (Cavalli-Sforza et al. 1994; Hoerder 2002). Even with large numbers of markers, information for estimating admixture proportions of individuals or groups is limited, and estimates typically will have wide confidence intervals (Pfaff et al. 2004).

Genetic clustering

{{Main|Human genetic clustering}}

Genetic data can be used to infer population structure and assign individuals to groups that often correspond with their self-identified geographical ancestry. Jorde and Wooding (2004) argued that "Analysis of many loci now yields reasonably accurate estimates of genetic similarity among individuals, rather than populations. Clustering of individuals is correlated with geographic origin or ancestry."[8] However, identification by geographic origin may quickly break down when considering historical ancestry shared between individuals back in time.[65]

An analysis of autosomal SNP data from the International HapMap Project (Phase II) and CEPH Human Genome Diversity Panel samples was published in 2009.

The study of 53 populations taken from the HapMap and CEPH data (1138 unrelated individuals) suggested that natural selection may shape the human genome much more slowly than previously thought, with factors such as migration within and among continents more heavily influencing the distribution of genetic variations.[66]

A similar study published in 2010 found strong genome-wide evidence for selection due to changes in ecoregion, diet, and subsistence

particularly in connection with polar ecoregions, with foraging, and with a diet rich in roots and tubers.[67] In a 2016 study, principal component analysis of genome-wide data was capable of recovering previously-known targets for positive selection (without prior definition of populations) as well as a number of new candidate genes.[68]

Forensic anthropology

Forensic anthropologists can determine aspects of geographic ancestry (i.e. Asian, African, or European) from skeletal remains with a high degree of accuracy by analyzing skeletal measurements.[69] According to some studies, individual test methods such as mid-facial measurements and femur traits can identify the geographic ancestry and by extension the racial category to which an individual would have been assigned during their lifetime, with over 80% accuracy, and in combination can be even more accurate. However, the skeletons of people who have recent ancestry in different geographical regions can exhibit characteristics of more than one ancestral group and, hence, cannot be identified as belonging to any single ancestral group.

Gene flow and admixture

{{Main|Gene flow}}

Gene flow between two populations reduces the average genetic distance between the populations, only totally isolated human populations experience no gene flow and most populations have continuous gene flow with other neighboring populations which create the clinal distribution observed for moth genetic variation. When gene flow takes place between well-differentiated genetic populations the result is referred to as "genetic admixture".

Admixture mapping is a technique used to study how genetic variants cause differences in disease rates between population.[70] Recent admixture populations that trace their ancestry to multiple continents are well suited for identifying genes for traits and diseases that differ in prevalence between parental populations. African-American populations have been the focus of numerous population genetic and admixture mapping studies, including studies of complex genetic traits such as white cell count, body-mass index, prostate cancer and renal disease.[71]

An analysis of phenotypic and genetic variation including skin color and socio-economic status was carried out in the population of Cape Verde which has a well documented history of contact between Europeans and Africans. The studies showed that pattern of admixture in this population has been sex-biased and there is a significant interactions between socio economic status and skin color independent of the skin color and ancestry.[72] Another study shows an increased risk of graft-versus-host disease complications after transplantation due to genetic variants in human leukocyte antigen (HLA) and non-HLA proteins.[73]

Health

{{See also|Race and health}}

Differences in allele frequencies contribute to group differences in the incidence of some monogenic diseases, and they may contribute to differences in the incidence of some common diseases.[74] For the monogenic diseases, the frequency of causative alleles usually correlates best with ancestry, whether familial (for example, Ellis-van Creveld syndrome among the Pennsylvania Amish), ethnic (Tay–Sachs disease among Ashkenazi Jewish populations), or geographical (hemoglobinopathies among people with ancestors who lived in malarial regions). To the extent that ancestry corresponds with racial or ethnic groups or subgroups, the incidence of monogenic diseases can differ between groups categorized by race or ethnicity, and health-care professionals typically take these patterns into account in making diagnoses.[75]

Even with common diseases involving numerous genetic variants and environmental factors, investigators point to evidence suggesting the involvement of differentially distributed alleles with small to moderate effects. Frequently cited examples include hypertension (Douglas et al. 1996), diabetes (Gower et al. 2003), obesity (Fernandez et al. 2003), and prostate cancer (Platz et al. 2000). However, in none of these cases has allelic variation in a susceptibility gene been shown to account for a significant fraction of the difference in disease prevalence among groups, and the role of genetic factors in generating these differences remains uncertain (Mountain and Risch 2004).

Some other variations on the other hand are beneficial to human, as they prevent certain diseases and increase the chance to adapt to the environment. For example, mutation in CCR5 gene that protects against AIDS. CCR5 gene is absent on the surface of cell due to mutation. Without CCR5 gene on the surface, there is nothing for HIV viruses to grab on and bind into. Therefore the mutation on CCR5 gene decreases the chance of an individual’s risk with AIDS. The mutation in CCR5 is also quite popular in certain areas, with more than 14% of the population carry the mutation in Europe and about 6–10% in Asia and North Africa.[76]

Apart from mutations, many genes that may have aided humans in ancient times plague humans today. For example, it is suspected that genes that allow humans to more efficiently process food are those that make people susceptible to obesity and diabetes today.[77]

Neil Risch of Stanford University has proposed that self-identified race/ethnic group could be a valid means of categorization in the USA for public health and policy considerations.[78][79] A 2002 paper by Noah Rosenberg's group makes a similar claim: "The structure of human populations is relevant in various epidemiological contexts. As a result of variation in frequencies of both genetic and nongenetic risk factors, rates of disease and of such phenotypes as adverse drug response vary across populations. Further, information about a patient’s population of origin might provide health care practitioners with information about risk when direct causes of disease are unknown."[80]

Genome projects

{{Details|:Category:Human genome projects}}

Human genome projects are scientific endeavors that determine or study the structure of the human genome. The Human Genome Project was a landmark genome project.

See also

  • Race and genetics
  • Archaeogenetics
  • Human evolutionary genetics
  • Multiregional hypothesis
  • Recent single origin hypothesis
  • Isolation by distance
  • Genealogical DNA test
  • Y-chromosome haplogroups in populations of the world
  • Human genetic clustering
Regional:
  • Genetic history of Europe
  • Genetic history of South Asia
  • African admixture in Europe
  • Genetic history of indigenous peoples of the Americas
  • Genetic history of the British Isles
Projects:
  • 1000 Genomes Project
  • Human Variome Project

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Further reading

{{refbegin|32em}}
  • {{cite journal | title = The use of racial, ethnic, and ancestral categories in human genetics research | journal = American Journal of Human Genetics | volume = 77 | issue = 4 | pages = 519–32 | date = October 2005 | pmid = 16175499 | pmc = 1275602 | doi = 10.1086/491747 | last1 = Race | first1 = Ethnicity }}
  • {{cite journal | vauthors = Altmüller J, Palmer LJ, Fischer G, Scherb H, Wjst M | title = Genomewide scans of complex human diseases: true linkage is hard to find | journal = American Journal of Human Genetics | volume = 69 | issue = 5 | pages = 936–50 | date = November 2001 | pmid = 11565063 | pmc = 1274370 | doi = 10.1086/324069 }}
  • {{cite journal | vauthors = Aoki K | title = Sexual selection as a cause of human skin colour variation: Darwin's hypothesis revisited | journal = Annals of Human Biology | volume = 29 | issue = 6 | pages = 589–608 | year = 2002 | pmid = 12573076 | doi = 10.1080/0301446021000019144 }}
  • {{cite journal | vauthors = Bamshad M, Wooding S, Salisbury BA, Stephens JC | title = Deconstructing the relationship between genetics and race | journal = Nature Reviews. Genetics | volume = 5 | issue = 8 | pages = 598–609 | date = August 2004 | pmid = 15266342 | doi = 10.1038/nrg1401 }} [https://web.archive.org/web/20051022081358/http://www.xmission.com/~wooding/pdfs/bamshad_race04.zip reprint-zip]
  • {{cite journal | vauthors = Bamshad M, Wooding SP | title = Signatures of natural selection in the human genome | journal = Nature Reviews. Genetics | volume = 4 | issue = 2 | pages = 99–111 | date = February 2003 | pmid = 12560807 | doi = 10.1038/nrg999 }}
  • {{cite journal | vauthors = Cann RL, Stoneking M, Wilson AC | title = Mitochondrial DNA and human evolution | journal = Nature | volume = 325 | issue = 6099 | pages = 31–6 | year = 1987 | pmid = 3025745 | doi = 10.1038/325031a0 | bibcode = 1987Natur.325...31C }}
  • {{cite journal | vauthors = Cardon LR, Abecasis GR | title = Using haplotype blocks to map human complex trait loci | journal = Trends in Genetics | volume = 19 | issue = 3 | pages = 135–40 | date = March 2003 | pmid = 12615007 | doi = 10.1016/S0168-9525(03)00022-2 }}
  • {{cite journal | vauthors = Cavalli-Sforza LL, Feldman MW | title = The application of molecular genetic approaches to the study of human evolution | journal = Nature Genetics | volume = 33 Suppl | issue = 3s | pages = 266–75 | date = March 2003 | pmid = 12610536 | doi = 10.1038/ng1113 }}
  • {{cite journal | vauthors = Collins FS | title = What we do and don't know about 'race', 'ethnicity', genetics and health at the dawn of the genome era | journal = Nature Genetics | volume = 36 | issue = 11 Suppl | pages = S13–5 | date = November 2004 | pmid = 15507997 | doi = 10.1038/ng1436 }}
  • {{cite journal | vauthors = Collins FS, Green ED, Guttmacher AE, Guyer MS | title = A vision for the future of genomics research | journal = Nature | volume = 422 | issue = 6934 | pages = 835–47 | date = April 2003 | pmid = 12695777 | doi = 10.1038/nature01626 | bibcode = 2003Natur.422..835C }}
  • {{cite journal | vauthors = Ebersberger I, Metzler D, Schwarz C, Pääbo S | title = Genomewide comparison of DNA sequences between humans and chimpanzees | journal = American Journal of Human Genetics | volume = 70 | issue = 6 | pages = 1490–7 | date = June 2002 | pmid = 11992255 | pmc = 379137 | doi = 10.1086/340787 }}
  • {{cite journal | vauthors = Edwards AW | title = Human genetic diversity: Lewontin's fallacy | journal = BioEssays | volume = 25 | issue = 8 | pages = 798–801 | date = August 2003 | pmid = 12879450 | doi = 10.1002/bies.10315 }}
  • {{cite journal | vauthors = Foster MW, Sharp RR | title = Beyond race: towards a whole-genome perspective on human populations and genetic variation | journal = Nature Reviews. Genetics | volume = 5 | issue = 10 | pages = 790–6 | date = October 2004 | pmid = 15510170 | doi = 10.1038/nrg1452 }}
  • {{cite journal | vauthors = Foster MW, Sharp RR, Freeman WL, Chino M, Bernsten D, Carter TH | title = The role of community review in evaluating the risks of human genetic variation research | journal = American Journal of Human Genetics | volume = 64 | issue = 6 | pages = 1719–27 | date = June 1999 | pmid = 10330360 | pmc = 1377916 | doi = 10.1086/302415 }}
  • {{cite journal | vauthors = Gabriel SB, Schaffner SF, Nguyen H, Moore JM, Roy J, Blumenstiel B, Higgins J, DeFelice M, Lochner A, Faggart M, Liu-Cordero SN, Rotimi C, Adeyemo A, Cooper R, Ward R, Lander ES, Daly MJ, Altshuler D | title = The structure of haplotype blocks in the human genome | journal = Science | volume = 296 | issue = 5576 | pages = 2225–9 | date = June 2002 | pmid = 12029063 | doi = 10.1126/science.1069424 | bibcode = 2002Sci...296.2225G }}
  • {{cite journal | vauthors = Harding RM, Healy E, Ray AJ, Ellis NS, Flanagan N, Todd C, Dixon C, Sajantila A, Jackson IJ, Birch-Machin MA, Rees JL | title = Evidence for variable selective pressures at MC1R | journal = American Journal of Human Genetics | volume = 66 | issue = 4 | pages = 1351–61 | date = April 2000 | pmid = 10733465 | pmc = 1288200 | doi = 10.1086/302863 }}
  • {{cite journal | vauthors = Ingman M, Kaessmann H, Pääbo S, Gyllensten U | title = Mitochondrial genome variation and the origin of modern humans | journal = Nature | volume = 408 | issue = 6813 | pages = 708–13 | date = December 2000 | pmid = 11130070 | doi = 10.1038/35047064 }}
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  • {{cite book | vauthors = Ramachandran S, Tang H, Gutenkunst RN, Bustamante CD |year=2010 |chapter=Genetics and Genomics of Human Population Structure | veditors = Speicher MR, Antonarakis SE, Motulsky AG |title=Vogel and Motulsky's Human Genetics: Problems and Approaches |edition=4th |publisher=Springer |isbn=978-3-540-37653-8 }}
{{refend}}

External links

{{Commons category|Human genetic diversity}}
  • Human Genome Variation Society
{{Human group differences}}{{Human genetics}}{{Population genetics}}{{Personal genomics}}{{Breakthrough of the Year}}{{DEFAULTSORT:Human Genetic Variation}}

3 : Human population genetics|Biological anthropology|Single-nucleotide polymorphisms
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