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Thread: Genetic admixture, among Mexican populations revealed by the Paternal chromosome2726 days old

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    Default Genetic admixture, among Mexican populations revealed by the Paternal chromosome

    Genetic admixture, relatedness, and structure patterns among Mexican populations revealed by the Y-chromosome.

    Centro de Investigación en Genética Molecular, Centro Universitario de la Ciénega, Universidad de Guadalajara (CUCiénega-UdeG), CP 47810, Ocotlán, Jalisco, México. [email protected]

    Abstract

    Y-linked markers are suitable loci to analyze genetic diversity of human populations, offering knowledge of medical, forensic, and anthropological interest. In a population sample of 206 Mestizo males from western Mexico, we analyzed two binary loci (M3 and YAP) and six Y-STRs, adding to the analysis data of Mexican Mestizos and Amerindians, and relevant worldwide populations. The paternal ancestry estimated in western Mexican-Mestizos was mainly European (60-64%), followed by Amerindian (25-21%), and African ( approximately 15%). Significant genetic heterogeneity was established between Mestizos from western (Jalisco State) and northern Mexico (Chihuahua State) compared with Mexicans from the center of the Mexican Republic (Mexico City), this attributable to higher European ancestry in western and northern than in central and southeast populations, where higher Amerindian ancestry was inferred. This genetic structure has important implications for medical and forensic purposes. Two different Pre-Hispanic evolutionary processes were evident. In Mesoamerican region, populations presented higher migration rate (N(m) = 24.76), promoting genetic homogeneity. Conversely, isolated groups from the mountains and canyons of the Western and Northern Sierra Madre (Huichols and Tarahumaras, respectively) presented a lower migration rate (N(m) = 10.27) and stronger genetic differentiation processes (founder effect and/or genetic drift), constituting a Pre-Hispanic population substructure. Additionally, Tarahumaras presented a higher frequency of Y-chromosomes without Q3 that was explained by paternal European admixture (15%) and, more interestingly, by a distinctive Native-American ancestry. In Purepechas, a special admixture process involving preferential integration of non-Purepecha women in their communities could explain contrary genetic evidences (autosomal vs. Y-chromosome) for this tribe.

    (c) 2007 Wiley-Liss, Inc.

    http://www.ncbi.nlm.nih.gov/pubmed/18161845

    Last edited by El R5; 2012-01-29 at 22:59.

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    Cuetlachtli57 (2012-02-04), Doctoris Scientia (2012-01-29), pgbk87 (2012-02-04), Tenochkatl (2012-02-04)

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    it almost correlates to the national averages.


    mtDNA:

    91.1% Amerindian, 5.7% European, 3.3% African (151 SNPs)

    Y-DNA:

    60% European, 33% amerindian 5% African, 2% Asian (117 SNPs)



    http://www.inmegen.gob.mx/tema/cms_p...TI%C3%81N_.pdf
    Last edited by Cuetlachtli57; 2012-02-04 at 18:50.

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    ^ Interesting that African Y-DNA is higher than mtDNA.

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    Probably because they are including the moorish ones.

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    Quote Originally Posted by jibarodepr View Post
    Probably because they are including the moorish ones.
    It doesn't seem likely, because the Y-DNA would likely be more like 10% African. It's most likely SSA. Plus they make a distinction between SSA mtDNA ("L") and "European" mtDNA , where they include "U" and "H", so it is safe to assume the same has been made for Y-DNA.

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    Quote Originally Posted by pgbk87 View Post
    It doesn't seem likely, because the Y-DNA would likely be more like 10% African. It's most likely SSA. Plus they make a distinction between SSA mtDNA ("L") and "European" mtDNA , where they include "U" and "H", so it is safe to assume the same has been made for Y-DNA.
    Because U and H had an origin in Europe, but E1b1b1 is African in origin.

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    Quote Originally Posted by jibarodepr View Post
    Because U and H had an origin in Europe, but E1b1b1 is African in origin.
    This is not true. Basal H is highest among Berbers as is U6. "U" is probably European though

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