Acta Univ. Agric. Silvic. Mendelianae Brun. 2019, 67, 1183-1188

https://doi.org/10.11118/actaun201967051183
Published online 2019-10-31

Deviation Patterns of Observed and Expected Haplotype Blocks Associated with Potential Recessive Disorders in Tyrol Grey Cattle

Maulana Naji1, Cord Drögemüller2, Gábor Mészáros1, Johann Sölkner1

1Division of Livestock Sciences, Department of Sustainable Agricultural Systems, University of Natural Resources and Life Sciences, Gregor-Mendel-Str. 33, A-1180 Vienna, Austria
2Institute of Genetics, Vetsuisse faculty, University of Bern, Bremgartenstrasse 109a, 3001 Bern, Switzerland

Received July 22, 2019
Accepted August 23, 2019

Confirmed by phenotypic records, several studies across different breeds in different locations have linked missing homozygous pattern with several defects in the functional system and recessive genetic disorders. Recessive genetic diseases are expressed when the recessive alleles appear in a homozygous state for an individual. One of the indicators to detect the recessive allele is through haplotypes, which have a normal frequency in the population, but never occur in the homozygous state. In this study, we used SNP genotypes of 220 Austrian Tyrol Grey cattle and 80 Italian Tyrol Grey cattle to identify the haplotype blocks (Hapblocks) that possibly carry genes causing recessive disorders. Hapblocks with missing homozygous state in the population were statistically tested as to whether this is very unlikely in Hardy-Weinberg equilibrium. Eight out of all hapblocks passing the threshold had functional genes which are crucial in maintaining the metabolism, production, reproduction, and health of the individuals. These hapblocks had a high frequency of above 13% but never appear in homozygous state. Thus, these are foreseen as potential source of genetic defects. Our finding in this analysis can be used as a reference for further study in haplotype analyses of inherited recessive disease for other cattle breeds.

Funding

Maulana Naji was granted Erasmus Mundus Alfabet for his MSc and currently receiving Ernst Mach Grant PhD scholarship from OeAD GmbH.

References

23 live references