Kumar Vikrant, Langstieh Banrida T, Madhavi Komal V, Naidu Vegi M, Singh Hardeep Pal, Biswas Silpak, Thangaraj Kumarasamy, Singh Lalji, Reddy B Mohan
Biological Anthropology Unit, Indian Statistical Institute, Hubsiguda, Hyderabad, India.
PLoS Genet. 2006 Apr;2(4):e53. doi: 10.1371/journal.pgen.0020053. Epub 2006 Apr 14.
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.
由于从夫居现象普遍存在，因此有假设认为，Y染色体变异在地理上往往比线粒体DNA（mtDNA）变异更具局限性。随后在泰国的某些从夫居和从妻居群体中提供了证实这一假设的经验证据，这符合距离隔离的基因扩散模式。然而，我们直观地预期，在婚姻制度受不同社会规范支配的人群中，尤其是那些遵循严格内婚制规则的人群中，遗传变异模式可能与上述假设不一致。我们通过分析三组不同程度遵循内婚制规则的印度人群的Y染色体和mtDNA数据，来检验这一假设的普遍性。我们对印度从夫居和从妻居群体的分析，并不证实泰国部落中观察到的性别特异性变异。我们的结果表明，不同文化过程对遗传变异的影响存在空间不稳定性，导致了在从夫居人群中，与mtDNA变异相比，Y染色体变异更大这一假设模式缺乏普遍性。
