ABSTRACT:The myostatin (MSTN) gene was studied as a candidate genetic marker for growth traits. We investigated polymorphisms of the MSTN gene in 664 individuals from four goat populations and applied PCR-SSCP and DNA sequencing analysis to reveal two single nucleotide polymorphisms (DQ167575: g.368A>C (p.Lys49Thr) and g.4911C>T. At g.368A>C locus, the frequencies of g.368A allele were 0.75-0.81, and the frequencies of g.368C allele were 0.19-0.25. At g.4911C>T locus, the frequencies of g.4911C allele were 0.76-0.82, and frequencies of g.4911T allele were 0.18-0.24. Compared to the female goats with AC genotype, those with AA genotype had superior body weight in Boer goats (15.69 ± 0.28 vs. 14.51 ± 0.31, P < 0.05) and F 1 generation of Boer × Guanzhong dairy goats (19.39 ± 0.34 vs. 18.27 ± 0.33, P < 0.05). In addition, the female goats with AA genotype (45.80 ± 0.33 cm) had greater withers height than those with AC genotype (44.78 ± 0.36 cm) in F 2 generation of Boer × Guanzhong dairy goats (P < 0.05). Hence, the biochemical and physiological functions along with the results obtained in our investigation suggest that the MSTN gene might play an important role in affecting the growth traits in goats.
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