Abstract
Most of the 160 million river buffalo in the world are in Asia where they are used extensively, both as a food source and for draught power. Only recently have investigations begun exploring the buffalo genome for variation that might influence health and productivity of these economically important animals. This paper describes the sequence variability of the toll-like receptor 5 (TLR5) gene, which recognizes bacterial flagellin and is a key player in the immune system. TLR5 is comprised of a single exon that is 2577 bp and codes 858 amino acids. We examined single-nucleotide polymorphisms (SNPs) located within the coding region. Overall, 17 SNPs were discovered, seven of which are non-synonymous. Our study population yielded four different haplotypes. We examined predicted protein domain structure and found that river buffalo, swamp buffalo, and African Forest buffalo shared the same protein domain structure and are more similar to each other than they are to cattle and American bison, which are similar to each other. PolyPhen 2 analysis revealed one amino acid substitution in the river buffalo population with potential functional significance.
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