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Title: Genetic and expression analysis of cattle identifies candidate genes in pathways responding to 'Trypanosoma congolense' infection
Contributor(s): Noyes, Harry (author); Brass, Andy (author); Hall, Laurence (author); Hanotte, Olivier (author); Hulme, Helen (author); McKeever, Declan (author); Murray, Caitriona (author); Oh, Sung Jung (author); Tate, Catriona (author); Smith, Ken (author); Tapio, Miika (author); Wambugu, John (author); Obara, Isaiah (author); Williams, Diana J (author); Agaba, Morris (author); Kemp, Stephen J (author); Anderson, Susan (author); Archibald, Alan L (author); Bradley, Dan G (author); Fisher, Paul (author); Freeman, Abigail (author); Gibson, John  (author); Gicheru, Michael (author)
Publication Date: 2011
Open Access: Yes
DOI: 10.1073/pnas.1013486108Open Access Link
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Abstract: African bovine trypanosomiasis caused by 'Trypanosoma' sp., is a major constraint on cattle productivity in sub-Saharan Africa. Some African 'Bos taurus' breeds are highly tolerant of infection, but the potentially more productive 'Bos indicus' zebu breeds are much more susceptible. Zebu cattle are well adapted for plowing and haulage, and increasing their tolerance of trypanosomiasis could have a major impact on crop cultivation as well as dairy and beef production. We used three strategies to obtain short lists of candidate genes within QTL that were previously shown to regulate response to infection. We analyzed the transcriptomes of trypanotolerant N'Dama and susceptible Boran cattle after infection with 'Trypanosoma congolense'. We sequenced EST libraries from these two breeds to identify polymorphisms that might underlie previously identified quantitative trait loci (QTL), and we assessed QTL regions and candidate loci for evidence of selective sweeps. The scan of the EST sequences identified a previously undescribed polymorphism in ARHGAP15 in the Bta2 trypanotolerance QTL. The polymorphism affects gene function in vitro and could contribute to the observed differences in expression of the MAPK pathway in vivo. The expression data showed that TLR and MAPK pathways responded to infection, and the former contained TICAM1, which is within a QTL on Bta7. Genetic analyses showed that selective sweeps had occurred at TICAM1 and ARHGAP15 loci in African taurine cattle, making them strong candidates for the genes underlying the QTL. Candidate QTL genes were identified in other QTL by their expression profile and the pathways in which they participate.
Publication Type: Journal Article
Source of Publication: Proceedings of the National Academy of Sciences, 108(22), p. 9304-9309
Publisher: National Academy of Sciences
Place of Publication: Washington DC, United States of America
ISSN: 1091-6490
Field of Research (FOR): 060408 Genomics
070201 Animal Breeding
070708 Veterinary Parasitology
Socio-Economic Objective (SEO): 839899 Environmentally Sustainable Animal Production not elsewhere classified
830302 Dairy Cattle
830301 Beef Cattle
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
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