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Subject: PubMed abstract: patterns of Y and mtDNA variation in different populations
Date: Tue, 1 Aug 2006 12:46:12 EDT

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PLoS Genet. 2006 Apr;2(4):e53. Epub 2006 Apr 14.

Global patterns in human mitochondrial DNA and Y-chromosome variation caused
by spatial instability of the local cultural processes.

Kumar V, Langstieh BT, Madhavi KV, Naidu VM, Singh HP, Biswas S, Thangaraj K,
Singh L, Reddy BM.

Biological Anthropology Unit, Indian Statistical Institute, Hubsiguda,
Hyderabad, India.

Because of the widespread phenomenon of patrilocality, it is hypothesized
that Y-chromosome variants tend to be more localized geographically than those of
mitochondrial DNA (mtDNA). Empirical evidence confirmatory to this hypothesis
was subsequently provided among certain patrilocal and matrilocal groups of
Thailand, which conforms to the isolation by distance mode of gene diffusion.
However, we expect intuitively that the patterns of genetic variability may not
be consistent with the above hypothesis among populations with different
social norms governing the institution of marriage, particularly among those that
adhere to strict endogamy rules. We test the universality of this hypothesis
by analyzing Y-chromosome and mtDNA data in three different sets of Indian
populations that follow endogamy rules to varying degrees. Our analysis of the
Indian patrilocal and the matrilocal groups is not confirmatory to the
sex-specific variation observed among the tribes of Thailand. Our results indicate
spatial instability of the impact of different cultural processes on the genetic
variability, resulting in the lack of universality of the hypothesized pattern
of greater Y-chromosome variation when compared to that of mtDNA among the
patrilocal populations.

PMID: 16617372 [PubMed - indexed for MEDLINE]

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