Journal Article

Founders, Drift, and Infidelity: The Relationship between Y Chromosome Diversity and Patrilineal Surnames

Turi E. King and Mark A. Jobling

in Molecular Biology and Evolution

Published on behalf of Society for Molecular Biology and Evolution

Volume 26, issue 5, pages 1093-1102
Published in print May 2009 | ISSN: 0737-4038
Published online February 2009 | e-ISSN: 1537-1719 | DOI: https://dx.doi.org/10.1093/molbev/msp022

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Most heritable surnames, like Y chromosomes, are passed from father to son. These unique cultural markers of coancestry might therefore have a genetic correlate in shared Y chromosome types among men sharing surnames, although the link could be affected by mutation, multiple foundation for names, nonpaternity, and genetic drift. Here, we demonstrate through an analysis of 1,678 Y-chromosomal haplotypes within 40 British surnames a remarkably high degree of coancestry that generally increases as surnames become rarer. On average, the proportion of haplotypes lying within descent clusters is 62% but ranges from 0% to 87%. The shallow time depth of many descent clusters within names, the lack of a detectable effect of surname derivation on diversity, and simulations of surname descent suggest that genetic drift through variation in reproductive success is important in structuring haplotype diversity. Modern patterns therefore provide little reliable information about the original founders of surnames some 700 years ago. A comparative analysis of published data on Y diversity within Irish surnames demonstrates a relative lack of surname frequency dependence of coancestry, a difference probably mediated through distinct Irish and British demographic histories including even more marked genetic drift in Ireland.

Keywords: surnames; Y chromosome; haplotype; haplogroup; genetic drift

Journal Article.  5690 words.  Illustrated.

Subjects: Evolutionary Biology ; Molecular and Cell Biology

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