Y Chromosome STR Haplotypes and the Genetic Structure of U.S. Populations of African, European, and Hispanic Ancestry

Genome Research - Tập 13 Số 4 - Trang 624-634 - 2003
Manfred Kayser1, Silke Brauer1, Hiltrud Schädlich2, Mechthild Prinz3, Mark A. Batzer4, Peter A. Zimmerman5, Boachie Boatin6, Mark Stoneking7
1Department of Evolutionary Genetics, Max Planck Institute for Evolutionary Anthropology, Max Planck Society
2Max Planck Institute for Evolutionary Anthropology
3Department of Forensic Biology
4Louisiana State University
5Genetics and Genome Sciences
6African Programme for Onchocerciasis Control, Ouagadougou
7Human Population History, Department of Evolutionary Genetics, Max Planck Institute for Evolutionary Anthropology, Max Planck Society

Tóm tắt

To investigate geographic structure within U.S. ethnic populations, we analyzed 1705 haplotypes on the basis of 9 short tandem repeat (STR) loci on the Y-chromosome from 9–11 groups each of African-Americans, European-Americans, and Hispanics. There were no significant differences in the distribution of Y-STR haplotypes among African-American groups, whereas European-American and Hispanic groups did exhibit significant geographic heterogeneity. However, the significant heterogeneity resulted from one sample; removal of that sample in each case eliminated the significant heterogeneity. Multidimensional scaling analysis of RST values indicated that African-American groups formed a distinct cluster, whereas there was some intermingling of European-American and Hispanic groups. MtDNA data exist for many of these same groups; estimates of the European-American genetic contribution to the African-American gene pool were 27.5%–33.6% for the Y-STR haplotypes and 9%–15.4% for the mtDNA types. The lack of significant geographic heterogeneity among Y-STR and mtDNA haplotypes in U.S ethnic groups means that forensic DNA databases do not need to be constructed for separate geographic regions of the U.S. Moreover, absence of significant geographic heterogeneity for these two loci means that regional variation in disease susceptibility within ethnic groups is more likely to reflect cultural/environmental factors, rather than any underlying genetic heterogeneity.

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