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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
biochemistry, genetics and molecular biology
Assessing the relative ages of admixture in the bovine hybrid zones of Africa and the Near East using X chromosome haplotype mosaicism
Genetics, Volume 173, No. 3, Year 2006
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Description
Historical hybridization events between the two subspecies of cattle, Bos taurus and B. indicus, have occurred in several regions of the world, while other populations have remained nonadmixed. We typed closely linked X chromosome microsatellites in cattle populations with differing histories of admixture from Africa, Europe, the Near East, and India. Haplotype breakdown will occur as admixed populations age, and longer ancestral haplotypes will remain intact in more recently admixed populations compared to older ones. We genotyped male animals from these populations, obtaining unambiguous haplotypes, and measured levels of linkage disequilibrium (LD) and ancestral mosaicism. Extensive LD, likely to be the result of ongoing admixture, was discovered in hybrid cattle populations from the perimeter of the tsetse zone in West Africa. A Bayesian method to assign microsatellite allele ancestry was used to designate the likely origin of each chromosomal segment and assess the relative ages of admixture in the populations. A gradient of the age of admixture in the African continent emerged, where older admixture has produced more fragmented haplotypes in the south, and longer intact haplotypes, indicating more recent hybridization, feature in the northwest. Copyright © 2006 by the Genetics Society of America.
Authors & Co-Authors
Freeman, Abigail
Ireland, Dublin
Trinity College Dublin
Hoggart, Clive J.
United Kingdom, London
Imperial College London
Hanotte, Olivier H.
Kenya, Nairobi
International Livestock Research Institute Nairobi
B̀radley, Daniel G.
Ireland, Dublin
Trinity College Dublin
Statistics
Citations: 35
Authors: 4
Affiliations: 3
Identifiers
Doi:
10.1534/genetics.105.053280
ISSN:
00166731
e-ISSN:
00166731
Research Areas
Genetics And Genomics
Study Locations
Multi-countries
Participants Gender
Male