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Genetic patterns of sex-biased admixture in southern African populations
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology.
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(English)Manuscript (preprint) (Other academic)
National Category
Evolutionary Biology
Identifiers
URN: urn:nbn:se:uu:diva-335212OAI: oai:DiVA.org:uu-335212DiVA, id: diva2:1161914
Available from: 2017-12-01 Created: 2017-12-01 Last updated: 2017-12-13
In thesis
1. Population genetic history and patterns of admixture: Examples from northeastern and southern Africa
Open this publication in new window or tab >>Population genetic history and patterns of admixture: Examples from northeastern and southern Africa
2018 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The origin of humans lies in Africa, as has been shown by archaeology, paleontology and genetics. Here, we can find the largest genetic diversity and the deepest split among human populations. African genetic diversity has been shaped by a long and complex history. In this thesis, I applied population genomic methods to investigate different aspects of the demographic history of Africa, specifically northeast and southern Africa.

Both of these regions are population melting-pots, with many historically known major migrations.

In northeast African populations, Eurasian admixture in central, northern, and eastern Sudanese populations was identified to be of Middle Eastern origin and the admixture time coincides with the Arab expansion. In northeast Africa I also studied alleles associated with lactase persistence, the ability to digest milk at an adult age. A wide diversity of these alleles was detected in Sudan, most commonly among pastoralists. The presence of a Middle Eastern LP-allele and absence of a European LP-allele is consistent with the admixture pattern observed in the first paper.

I deciphered the patterns of genetic admixture in the Afrikaner population of South Africa and compared admixture patterns of the X-chromosome and autosomes to disentangle sex-biased admixture in southern African populations.

The Afrikaner were shown to carry on average 5% non-European admixture, mostly from Khoe-San, East and South Asian sources. The admixture was sex-biased, with larger contributions from European males and admixture with Africans can be dated to 9-10 generations ago – fitting previous genealogical estimates of the age and the history of the population.

Bantu-speaker/Khoe-San contact shows a pattern of female Bantu-speaker bias, which is conflicting with previous mtDNA and Y-chromosome studies. A change in mate-choice over time could explain this discrepancy.

This thesis contributes to a deeper understanding of African demographic history in general and of some previously understudied populations and geographic areas in particular.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2018. p. 57
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1614
Keywords
population structure, genetic admixture, genomic variation, Africa, population genomics, lactase persistence, sex-biased admixture, human evolutionary genetics
National Category
Evolutionary Biology Genetics Bioinformatics (Computational Biology)
Research subject
Biology with specialization in Evolutionary Organismal Biology
Identifiers
urn:nbn:se:uu:diva-335214 (URN)978-91-513-0193-8 (ISBN)
Public defence
2018-02-16, Lindahlsalen, Norbyvägen 18A, Uppsala, 10:00 (English)
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Supervisors
Available from: 2018-01-24 Created: 2017-12-13 Last updated: 2018-03-07

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