Mapping of quantitative trait loci controlling trypanotolerance in a cross of tolerant West African N'Dama and susceptible East African Boran cattle

Title
Mapping of quantitative trait loci controlling trypanotolerance in a cross of tolerant West African N'Dama and susceptible East African Boran cattle
Publication Date
2003
Author(s)
Hanotte, O
Ronin, Y
Soller, M
Teale, A
Agaba, M
Nilsson, P
Gelhaus, A
Horstmann, R
Sugimoto, Y
Kemp, S
Gibson, John Paul
Koral, A
Type of document
Journal Article
Language
en
Entity Type
Publication
Publisher
National Academy of Sciences
Place of publication
United States of America
DOI
10.1073/pnas.1232392100
UNE publication id
une:1312
Abstract
Trypanosomosis, or sleeping sickness, is a major disease constraint on livestock productivity in sub-Saharan Africa. To identify quantitative trait loci (QTL) controlling resistance to trypanosomosis in cattle, an experimental cross was made between trypanotolerant African N'Dama (Bos taurus) and trypanosusceptible improved Kenya Boran (Bos indicus) cattle. Sixteen phenotypic traits were defined describing anemia, body weight, and parasitemia. One hundred seventy-seven F₂ animals and their parents and grandparents were genotyped at 477 molecular marker loci covering all 29 cattle autosomes. Total genome coverage was 82%. Putative QTL were mapped to 18 autosomes at a genomewise false discovery rate of <0.20. The results are consistent with a single QTL on 17 chromosomes and two QTL on BTA16. Individual QTL effects ranged from ≈6% to 20% of the phenotypic variance of the trait. Excluding chromosomes with ambiguous or nontrypanotolerance effects, the allele for resistance to trypanosomosis originated from the N'Dama parent at nine QTL and from the Kenya Boran at five QTL, and at four QTL there is evidence of an overdominant mode of inheritance. These results suggest that selection for trypanotolerance within an F₂ cross between N'Dama and Boran cattle could produce a synthetic breed with higher trypanotolerance levels than currently exist in the parental breeds.© 2009 by the National Academy of Sciences of the United States of America.
Link
Citation
Proceedings of the National Academy of Sciences, 100(13), p. 7443-7448
ISSN
1091-6490
0027-8424
Start page
7443
End page
7448

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