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Sex-specific genetic structure and social organization in Central Asia: insights from a multi-locus study.

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posted on 2012-10-24, 08:59 authored by L. Ségurel, B. Martínez-Cruz, L. Quintana-Murci, Patricia Balaresque, M. Georges, T. Hegay, A. Aldashev, F. Nasyrova, Mark A. Jobling, E. Heyer, R. Vitalis
In the last two decades, mitochondrial DNA (mtDNA) and the non-recombining portion of the Y chromosome (NRY) have been extensively used in order to measure the maternally and paternally inherited genetic structure of human populations, and to infer sex-specific demography and history. Most studies converge towards the notion that among populations, women are genetically less structured than men. This has been mainly explained by a higher migration rate of women, due to patrilocality, a tendency for men to stay in their birthplace while women move to their husband's house. Yet, since population differentiation depends upon the product of the effective number of individuals within each deme and the migration rate among demes, differences in male and female effective numbers and sex-biased dispersal have confounding effects on the comparison of genetic structure as measured by uniparentally inherited markers. In this study, we develop a new multi-locus approach to analyze jointly autosomal and X-linked markers in order to aid the understanding of sex-specific contributions to population differentiation. We show that in patrilineal herder groups of Central Asia, in contrast to bilineal agriculturalists, the effective number of women is higher than that of men. We interpret this result, which could not be obtained by the analysis of mtDNA and NRY alone, as the consequence of the social organization of patrilineal populations, in which genetically related men (but not women) tend to cluster together. This study suggests that differences in sex-specific migration rates may not be the only cause of contrasting male and female differentiation in humans, and that differences in effective numbers do matter.


This work was supported by the Centre National de la Recherche Scientifique (CNRS) ATIP programme (to EH), by the CNRS interdisciplinary programme “Origines de l'Homme du Langage et des Langues” (OHLL) and by the European Science Foundation (ESF) EUROCORES programme “The Origin of Man, Language and Languages” (OMLL). We also thank the “Fondation pour la Recherche Médicale” (FRM) for financial support. LS is financed by the French Ministry of Higher Education and Research. MAJ is supported by a Wellcome Trust Senior Fellowship in Basic Biomedical Science (grant number 057559).



PLoS Genetics, 2008, 4 (9), pp. e1000200-e1000200

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