Race and genetics

Trait, protein and gene studies

Early racial classification attempts measured surface traits, particularly skin color, hair color and texture, eye color, and head size and shape. (Measurements of the latter through craniometry were repeatedly discredited in the late 19th and mid-20th centuries.^[2])

Biological adaptation plays a role in these bodily features and skin type. According to Luigi Luca Cavalli-Sforza, "From a scientific point of view, the concept of race has failed to obtain any consensus; none is likely, given the gradual variation in existence. It may be objected that the racial stereotypes have a consistency that allows even the layman to classify individuals. However, the major stereotypes, all based on skin color, hair color and form, and facial traits, reflect superficial differences that are not confirmed by deeper analysis with more reliable genetic traits and whose origin dates from recent evolution mostly under the effect of climate and perhaps sexual selection".^{[3][4][5][6][7][8]}

A relative handful of genes accounts for the inherited factors shaping a person's appearance.^[9][10] Humans have an estimated 19,000-20,000 human protein-coding genes.^[11] Richard Sturm and David Duffy describe 11 genes that affect skin pigmentation and explain most variations in human skin color, the most significant of which are MC1R, ASIP, OCA2, and TYR.^[12] There is evidence that as many as 16 different genes could be responsible for eye color in humans; however, the main two genes associated with eye color variation are OCA2 and HERC2, and both are localized in Chromosome 15.^[13]

Geographic distribution of blood group B

Analysis of blood proteins

Geographic distribution of blood group A

Before the discovery of DNA, scientists used blood proteins (the human blood group systems) to study human genetic variation. Research by Ludwik and Hanka Herschfeld during World War I found that the incidence of blood groups A and B differed by region; for example, among Europeans 15 percent were group B and 40 percent group A. Eastern Europeans and Russians had a higher incidence of group B; people from India had the greatest incidence. The Herschfelds concluded that humans comprised two "biochemical races", originating separately. It was hypothesized that these two races later mixed, resulting in the patterns of groups A and B. This was one of the first theories of racial differences to include the idea that human variation did not correlate with genetic variation. It was expected that groups with similar proportions of blood groups would be more closely related, but instead it was often found that groups separated by great distances (such as those from Madagascar and Russia), had similar incidences.^[14] It was later discovered that the ABO blood group system is not just common to humans, but shared with other primates,^[15] and likely predates all human groups.^[16]

Population genetics

Researchers currently use genetic testing, which may involve hundreds (or thousands) of genetic markers or the entire genome.

Structure

Principal component analysis of fifty populations, color-coded by region, illustrates the differentiation and overlap of populations found using this method of analysis.

Several methods to examine and quantify genetic subgroups exist, including cluster and principal components analysis. Genetic markers from individuals are examined to find a population's genetic structure. While subgroups overlap when examining variants of one marker only, when a number of markers are examined different subgroups have different average genetic structure. An individual may be described as belonging to several subgroups. These subgroups may be more or less distinct, depending on how much overlap there is with other subgroups.^[17]

In cluster analysis, the number of clusters to search for K is determined in advance; how distinct the clusters are varies. The results obtained from cluster analyses depend on several factors:

• A large number genetic markers studied facilitates finding distinct clusters.^[18]
• Some genetic markers vary more than others, so fewer are required to find distinct clusters.^[19] Ancestry-informative markers exhibits substantially different frequencies between populations from different geographical regions. Using AIMs, scientists can determine a person's ancestral continent of origin based solely on their DNA. AIMs can also be used to determine someone's admixture proportions.^[20]
• The more individuals studied, the easier it becomes to detect distinct clusters (statistical noise is reduced).^[19]
• Low genetic variation makes it more difficult to find distinct clusters.^[19] Greater geographic distance generally increases genetic variation, making identifying clusters easier.^[21]
• A similar cluster structure is seen with different genetic markers when the number of genetic markers included is sufficiently large. The clustering structure obtained with different statistical techniques is similar. A similar cluster structure is found in the original sample with a subsample of the original sample.^[22]

Recent studies have been published using an increasing number of genetic markers.^{[19][22][23][24][25][26]}

History and geography

Cavalli-Sforza has described two methods of ancestry analysis.^[29] Current-population genetic structure does not imply that differing clusters or components indicate only one ancestral home per group; for example, a genetic cluster in the US comprises Hispanics with European, Native American and African ancestry.^[18]

Geographic analyses attempt to identify places of origin, their relative importance and possible causes of genetic variation in an area. The results can be presented as maps showing genetic variation. Cavalli-Sforza and colleagues argue that if genetic variations are investigated, they often correspond to population migrations due to new sources of food, improved transportation or shifts in political power. For example, in Europe the most significant direction of genetic variation corresponds to the spread of agriculture from the Middle East to Europe between 10,000 and 6,000 years ago.^[29] Such geographic analysis works best in the absence of recent large-scale, rapid migrations.

Historic analyses use differences in genetic variation (measured by genetic distance) as a molecular clock indicating the evolutionary relation of species or groups, and can be used to create evolutionary trees reconstructing population separations.^[29]

Validation

Results of genetic-ancestry research are supported if they agree with research results from other fields, such as linguistics or archeology.^[29] Cavalli-Sforza and colleagues have argued that there is a correspondence between language families found in linguistic research and the population tree they found in their 1994 study. There are generally shorter genetic distances between populations using languages from the same language family. Exceptions to this rule are Sami, who are genetically associated with populations speaking languages from other language families. The Sami speak a Uralic language, but are genetically primarily European. This is argued to have resulted from migration (and interbreeding) with Europeans while retaining their original language. Agreement also exists between research dates in archeology and those calculated using genetic distance.^[19][29]

Group size

Research techniques can be used to detect genetic population differences if enough genetic markers are used; the Japanese and Chinese East Asian populations have been identified.^[30] Sub-Saharan Africans have greater genetic diversity than other populations.^[31]

Between-group genetics

In 1972, Richard Lewontin performed a F_ST statistical analysis using 17 markers (including blood-group proteins). He found that the majority of genetic differences between humans (85.4 percent) were found within a population, 8.3 percent were found between populations within a race and 6.3 percent were found to differentiate races (Caucasian, African, Mongoloid, South Asian Aborigines, Amerinds, Oceanians, and Australian Aborigines in his study). Since then, other analyses have found F_ST values of 6–10 percent between continental human groups, 5–15 percent between different populations on the same continent and 75–85 percent within populations.^{[32][33][34][35][36]} This view has been affirmed by the American Anthropological Association and the American Association of Physical Anthropologists since.^[37]

While acknowledging Lewontin's observation that humans are genetically homogeneous, A. W. F. Edwards in his 2003 paper "Human Genetic Diversity: Lewontin's Fallacy" argued that information distinguishing populations from each other is hidden in the correlation structure of allele frequencies, making it possible to classify individuals using mathematical techniques. Edwards argued that even if the probability of misclassifying an individual based on a single genetic marker is as high as 30 percent (as Lewontin reported in 1972), the misclassification probability nears zero if enough genetic markers are studied simultaneously. Edwards saw Lewontin's argument as based on a political stance, denying biological differences to argue for social equality.^[38]

In The Ancestor's Tale Richard Dawkins devotes a chapter to the subject of race and genetics. Dawkins agreed with Lewontin on the science, covering the relatively low genetic variation between races and geneticists' conclusion that race is not an important aspect of a person, and accepted Lewontin's position that our perception of relatively large differences between human races and subgroups, as compared to the variation within these groups, is a biased perception and that human races and populations are remarkably similar to each other, with the largest part by far of human variation being accounted for by the differences between individuals. He also agreed that racial classification had no social value, and was in fact destructive, saying that it informs us about no more than the traits common used to classify race: the superficial, external traits like eye shape and skin color. However, Dawkins took issue with Lewontin's politics; and, like Edwards, Dawkins disagreed with Lewontin's conclusion that race is of "virtually no genetic or taxonomic significance", summarizing Edwards' point that however small the racial partition of the total variation may be, if such racial characteristics as there are highly correlated with other racial characteristics, they are by definition informative, and therefore of taxonomic significance.^[39]

While acknowledging that F_ST remains useful, a number of scientists have written about other approaches to characterizing human genetic variation.^[40][41][42] Long & Kittles (2009) stated that F_ST failed to identify important variation and that when the analysis includes only humans, F_ST = 0.119, but adding chimpanzees increases it only to F_ST = 0.183.^[40] Mountain & Risch (2004) argued that an F_ST estimate of 0.10-0.15 does not rule out a genetic basis for phenotypic differences between groups and that a low F_ST estimate implies little about the degree to which genes contribute to between-group differences.^[41] Pearse & Crandall 2004 wrote that F_ST figures cannot distinguish between a situation of high migration between populations with a long divergence time, and one of a relatively recent shared history but no ongoing gene flow.^[42] In their 2015 article, Keith Hunley, Graciela Cabana, and Jeffrey Long (who had previously criticized Lewontin's statistical methodology with Rick Kittles^[37]) recalculate the apportionment of human diversity using a more complex model than Lewontin and his successors. They conclude: "In sum, we concur with Lewontin’s conclusion that Western-based racial classifications have no taxonomic significance, and we hope that this research, which takes into account our current understanding of the structure of human diversity, places his seminal finding on firmer evolutionary footing."^[43]

Anthropologists (such as C. Loring Brace),^[44] philosopher Jonathan Kaplan and geneticist Joseph Graves^[45] have argued that while it is possible to find biological and genetic variation roughly corresponding to race, this is true for almost all geographically distinct populations: the cluster structure of genetic data is dependent on the initial hypotheses of the researcher and the populations sampled. When one samples continental groups, the clusters become continental; with other sampling patterns, the clusters would be different. Weiss and Fullerton note that if one sampled only Icelanders, Mayans and Maoris, three distinct clusters would form; all other populations would be composed of genetic admixtures of Maori, Icelandic and Mayan material.^[46] Kaplan therefore concludes that, while differences in particular allele frequencies can be used to identify populations that loosely correspond to the racial categories common in Western social discourse, the differences are of no more biological significance than the differences found between any human populations (e.g., the Spanish and Portuguese).^[47]

Self-identification

Jorde and Wooding (2004) found that while clusters from genetic markers were correlated with some traditional concepts of race, the correlations were imperfect and imprecise due to the continuous and overlapping nature of genetic variation, noting that ancestry, which can be accurately determined, is not equivalent to the concept of race.^[30]

A 2005 study by Tang and colleagues used 326 genetic markers to determine genetic clusters. The 3,636 subjects, from the United States and Taiwan, self-identified as belonging to white, African American, East Asian or Hispanic ethnic groups. The study found "nearly perfect correspondence between genetic cluster and SIRE for major ethnic groups living in the United States, with a discrepancy rate of only 0.14 percent".^[18]

Paschou et al. (2010) found "essentially perfect" agreement between 51 self-identified populations of origin and the population's genetic structure, using 650,000 genetic markers. Selecting for informative genetic markers allowed a reduction to less than 650, while retaining near-total accuracy.^[48]

Correspondence between genetic clusters in a population (such as the current US population) and self-identified race or ethnic groups does not mean that such a cluster (or group) corresponds to only one ethnic group. African Americans have an estimated 10–20-percent European genetic admixture; Hispanics have European, Native American and African ancestry.^[18] In Brazil there has been extensive admixture between Europeans, Amerindians and Africans. As a result, skin color differences within the population are not gradual, and there's relatively weak associations between self-reported race and African ancestry.^[49][50] Ethnoracial self- classification in Brazilians is certainly not random with respect to genome individual ancestry, but the strength of the association between the phenotype and median proportion of African ancestry varies largely across population.^[51]

Genetic-distance increase

A change in a gene pool may be abrupt or clinal.

Genetic distances generally increase continually with geographic distance, which makes a dividing line arbitrary. Any two neighboring settlements will exhibit some genetic difference from each other, which could be defined as a race. Therefore, attempts to classify races impose an artificial discontinuity on a naturally occurring phenomenon. This explains why studies on population genetic structure yield varying results, depending on methodology.^[52] Rosenberg and colleagues (2005) have argued, based on cluster analysis of the 52 populations in the Human Genetic Diversity Panel, that populations do not always vary continuously and a population's genetic structure is consistent if enough genetic markers (and subjects) are included.

"Examination of the relationship between genetic and geographic distance supports a view in which the clusters arise not as an artifact of the sampling scheme, but from small discontinuous jumps in genetic distance for most population pairs on opposite sides of geographic barriers, in comparison with genetic distance for pairs on the same side. Thus, analysis of the 993-locus dataset corroborates our earlier results: if enough markers are used with a sufficiently large worldwide sample, individuals can be partitioned into genetic clusters that match major geographic subdivisions of the globe, with some individuals from intermediate geographic locations having mixed membership in the clusters that correspond to neighboring regions."

They also wrote, regarding a model with five clusters corresponding to Africa, Eurasia (Europe, Middle East, and Central/South Asia), East Asia, Oceania, and the Americas: "For population pairs from the same cluster, as geographic distance increases, genetic distance increases in a linear manner, consistent with a clinal population structure. However, for pairs from different clusters, genetic distance is generally larger than that between intracluster pairs that have the same geographic distance. For example, genetic distances for population pairs with one population in Eurasia and the other in East Asia are greater than those for pairs at equivalent geographic distance within Eurasia or within East Asia. Loosely speaking, it is these small discontinuous jumps in genetic distance—across oceans, the Himalayas, and the Sahara—that provide the basis for the ability of STRUCTURE to identify clusters that correspond to geographic regions".^[22] This applies to populations in their ancestral homes when migrations and gene flow were slow; large, rapid migrations exhibit different characteristics. Tang and colleagues (2004) wrote, "we detected only modest genetic differentiation between different current geographic locales within each race/ethnicity group. Thus, ancient geographic ancestry, which is highly correlated with self-identified race/ethnicity—as opposed to current residence—is the major determinant of genetic structure in the U.S. population".^[18]

Number of clusters

Cluster analysis has been criticized because the number of clusters to search for is decided in advance, with different values possible (although with varying degrees of probability).^[53] Principal component analysis does not decide in advance how many components for which to search,^[54] and it has been used in an increasing number of studies.

Utility

It has been argued that knowledge of a person's race is limited in value, since people of the same race vary from one another.^[30] Witherspoon and colleagues (2007) have argued that when individuals are assigned to population groups, two randomly chosen individuals from different populations can resemble each other more than a randomly chosen member of their own group. They found that many thousands of genetic markers had to be used for the answer to "How often is a pair of individuals from one population genetically more dissimilar than two individuals chosen from two different populations?" to be "never". This assumed three population groups, separated by large geographic distances (European, African and East Asian). The global human population is more complex, and studying a large number of groups would require an increased number of markers for the same answer. They conclude that "caution should be used when using geographic or genetic ancestry to make inferences about individual phenotypes",^[55] and "The fact that, given enough genetic data, individuals can be correctly assigned to their populations of origin is compatible with the observation that most human genetic variation is found within populations, not between them. It is also compatible with our finding that, even when the most distinct populations are considered and hundreds of loci are used, individuals are frequently more similar to members of other populations than to members of their own population".^[56]

This is similar to the conclusion reached by anthropologist Norman Sauer in a 1992 article on the ability of forensic anthropologists to assign "race" to a skeleton, based on craniofacial features and limb morphology. Sauer said, "the successful assignment of race to a skeletal specimen is not a vindication of the race concept, but rather a prediction that an individual, while alive was assigned to a particular socially constructed 'racial' category. A specimen may display features that point to African ancestry. In this country that person is likely to have been labeled Black regardless of whether or not such a race actually exists in nature".^[57]

Usage in scientific journals

Some scientific journals have addressed previous methodological errors by requiring more rigorous scrutiny of population variables. Since 2000, Nature Genetics requires its authors to “explain why they make use of particular ethnic groups or populations, and how classification was achieved.” Editors of Nature Genetics say that “[they] hope that this will raise awareness and inspire more rigorous design of genetic and epidemiological studies.”^[66]