Whole genome sequence and analysis of the Marwari horse breed and its genetic origin (#49)
Background
The horse (Equus ferus caballus) is one of the earliest domesticated species and has played numerous important roles in human societies over the past 5,000 years. In this study, we characterized the genome of the Marwari horse, a rare breed with certain unique characteristics such as inwardly turned ear tips. The breed is thought to have arisen from breeding local Indian ponies with Arabian horses beginning in the 12th century.
Results
We generated 101 Gb (~30´ coverage) of whole genome sequences from a Marwari horse using the Illumina HiSeq2000 sequencer. The sequences were mapped to the horse reference genome at a mapping rate of ~98% and with ~95% of the genome having at least 10´ coverage. A total of 5.9 million single nucleotide variations and 0.6 million small insertions or deletions were identified. We confirmed a strong Arabian and Mongolian component in the Marwari genome. Novel variants from the Marwari sequences were annotated, and were found to be enriched in olfactory functions. Additionally, we suggest a potential functional genetic variant in the TSHZ1 gene (p.Ala344>Val) associated with the inward-turning ear tip shape of the Marwari horses.
Conclusions
Here, we present an analysis of the Marwari horse genome. This is the first genomic data for an Asian breed, and is an invaluable resource for future studies of genetic variation associated with phenotypes and diseases in horses.
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