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To elucidate the genetic characteristics of the bovine Inhibin α subunit (INHA) gene, the polymorphisms in exon 1 of INHA and its bilateral sequences were assayed using PCR with direct sequencing in buffalo, gayal and yak. A comparative analysis was conducted by pooled the results in this study with the published data of INHA on some mammals including some bovine species together. A synonymous substitution c.73C&gt;A was identified in exon 1 of INHA for buffalo, which results in identical encoding product in river and swamp buffalo. In gayal, two non-synonymous but same property substitutions in exon 1 of INHA, viz. c.62 C&gt;T and c.187 G&gt;A, were detected, which lead to p. P21L, p. V63M changes in INHA, respectively. In yak, nucleotide substitution c.62C&gt; T, c.129A&gt;G were found in exon 1 of INHA, the former still causes p. P21L substitution and the latter is synonymous. For the sequence of the 5'-flanking region of INHA examined, no SNPs were found within the species, but a substitution, c. -6T&gt;G, was found. The nucleotide in this site in gayal, yak and cattle was c. -6G, whereas in buffalo it was c. -6T. Meanwhile, a 6-bp deletion, namely c. 262+31_262+36delTCTGAC, was found in the intron of buffalo INHA gene. For this deletion, wild types (+/+) account for main part in river buffalo while mutant types (-/-) are predominant in swamp buffalo. This deletion was not found in gayal, yak and cattle, though these all have another deletion in the intron of INHA, c. 262+78_262+79delTG. The results of sequence alignment showed that the substitutions c. 43A and c. 67G in exon 1 of INHA are specific to buffalo, whereas the substitutions c. 173A and c. 255G are exclusive to gayal, yak and cattle, and c. 24C, c. 47G, c. 174T and c. 206T are specific to goat. Furthermore, there are few differences among gayal, yak and cattle, but there relatively great differences between buffalo, goat and other bovine species regarding the sequences of INHA exon 1.

zoological research

Polymorphisms of inhibin α gene exon 1 in buffalo (&lt;I&gt;Bubalus bubalis&lt;/I&gt;), gayal (&lt;I&gt;Bos frontalis&lt;/I&gt;) and yak (&lt;I&gt;Bos grunniens&lt;/I&gt;)