Abstract
Buffaloes in Indian subcontinent play an important role as the producer of milk and milk products. The alpha(s1)-casein constitutes 38% of the total milk proteins. The present study was carried out to characterize the gene in Murrah breed of Riverine buffalo. Buffalo alpha(s1)-casein cDNA was synthesized by RT-PCR, then cloned using pDRIVE-cloning vector and sequenced. The sequencing revealed that the size of alpha(s1)-casein cDNA was of 645 bp with GC content of 45.58%. The alpha(s1)-casein gene coded 214 amino acids precursor with a signal peptide of 15 amino acid residues. The similarity of buffalo alpha(s1)-casein mRNA sequence with that of cattle, goat, sheep, pig, camel, equine and human were estimated as 97.2, 93, 92.3, 57.2, 59.5, 55.9 and 46.6%, respectively. A similar trend was observed when compared amino acid sequences of these species. In the phylogenetic trees, constructed from the data of the alpha(s1)-casein mRNA as well as protein sequences, it has been observed that buffalo, cattle, goat and sheep formed a cluster with a closer relationship between cattle and buffalo followed by goat and sheep.
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