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Early cattle husbandry: Y chromosome haplogroups reveal aurochs introgression in Europe
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Biology, Department of Evolutionary Biology.
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Identifiers
URN: urn:nbn:se:uu:diva-91485OAI: oai:DiVA.org:uu-91485DiVA: diva2:164237
Available from: 2004-03-24 Created: 2004-03-24 Last updated: 2010-01-13Bibliographically approved
In thesis
1. Evolutionary Studies of the Mammalian Y Chromosome
Open this publication in new window or tab >>Evolutionary Studies of the Mammalian Y Chromosome
2004 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Sex chromosomes are useful in elucidating the evolutionary factors affecting diversity and divergence. In particular, Y chromosome analyses may complement studies using mitochondrial DNA for inferring sex-specific population genetic processes.

Y chromosome studies have been scarce due to limited access to genetic markers and the dynamic evolution of Y. Conserved Y-specific primers that could amplify a diverse set of mammalian species were developed from comparison of gametologous X and Y sequences. Y-specific sequence, generally more than one kb, was amplified for all 20 species examined.

Intraspecific diversity on mammalian Y was found to be reduced even when male-biased mutation rate and effective population size were corrected for. A number of factors can cause this low variation on Y of which selection on a haploid chromosome seems most important.

The field vole (Microtus agrestis), a common and well-studied small mammal in Eurasia, was examined for X and Y variability. Earlier studies on mtDNA had shown that the field vole is separated in two distinct lineages in Europe. The X and Y chromosome sequences confirmed the deep split and suggested that the two lineages of field vole should be reclassified as two separate species.

Two distinct Y chromosome haplogroups were found in modern European cattle, distributed among breeds according to a north-south gradient. Ancient DNA analysis of European aurochsen showed the northern haplogroup to be the most common, possibly indicating local hybridization between domestic cows and wild aurochs bulls in Europe.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2004. 55 p.
Series
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 951
Keyword
Genetics, Y chromosome, field vole, cattle, selection, primer design, Genetik
National Category
Medical Genetics
Identifiers
urn:nbn:se:uu:diva-4126 (URN)91-554-5904-8 (ISBN)
Public defence
2004-04-16, Zootissalen, EBC, Uppsala, 10:00
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Available from: 2004-03-24 Created: 2004-03-24Bibliographically approved

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