Massive detection of cryptic recessive genetic defects in cattle mining millions of life histories
Besnard, F.; Guintard, A.; Grohs, C.; Guzylack-Piriou, L.; Cano, M.; Escouflaire, C.; Hoze, C.; Leclerc, H.; Buronfosse, T.; Dutheil, L.; Jourdain, J.; Barbat, A.; Fritz, S.; Deloche, M.-C.; Remot, A.; Gausseres, B.; Clement, A.; Bouchier, M.; Elise, C.; Relun, A.; Plassard, V.; Riviere, J.; Pechoux, C.; Vilotte, M.; Eche, C.; Kuchly, C.; Charles, M.; Boulling, A.; Viard, G.; Minery, S.; Barbey, S.; Birbes, C.; Danchin, C.; Launay, F.; Mattalia, S.; Bonnet, A.; Ravary, B.; Millemann, Y.; Guatteo, R.; Klopp, C.; Gaspin, C.; Iampietro, C.; Donnadieu, C.; Milan, D.; Arcangioli, M.-A.; Boussaha, M
Show abstract
We present a data-mining framework designed to detect recessive defects in livestock that have been previously missed due to a lack of specific signs, incomplete penetrance, or incomplete linkage disequilibrium. This approach leverages the massive data generated by genomic selection. Its basic principle is to compare the observed and expected numbers of homozygotes for sliding haplotypes in animals with different life histories. Within three cattle breeds, we report 33 new loci responsible for increased risk of juvenile mortality and present a series of validations based on large-scale genotyping, clinical examination, and functional studies for candidate variants affecting the NOA1, RFC5, and ITGB7 genes. In particular, we describe disorders associated with NOA1 and RFC5 mutations for the first time in vertebrates. The discovery of these many new defects will help to characterize the genetic basis of inbreeding depression, while their management will improve animal welfare and reduce losses to the industry.
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