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Novel Mutation in Exon 1 of the BMP15 Gene and its Association with Reproduction Traits in Sheep.

The BMP15 gene is a growth factor and a member of the transforming growth factor β (TGFβ) superfamily, specifically expressed in oocytes. In the present study, polymorphism of BMP15 gene exon 1 was studied using single strand conformational polymorphism (SSCP) and direct DNA sequencing methods in 170 Mehraban and Lori sheep ewes. A 231-bp fragment in BMP15 exon 1 was amplified by PCR reactions. Two genotypes (GG and AG) with a new point mutation at position 121 bp of the studied fragment (c.379G>A in reference GenBank number AF236078.1 sequence), deducing an amino acid exchange in the codified amino acid sequence (p.Glu41Lys) were identified in the studied populations. The AG and GG frequencies were 74.4% and 25.6% in Mehraban and 44.7% and 55.3% in Lori sheep, respectively. Frequencies of the A and G alleles were 37.2% and 62.8% in Mehraban and 22.4% and 77.6% in Lori sheep, respectively. Two different secondary structures of protein were predicted for encoded precursor protein. The genotypes GG and AG did not have any significant association with the studied reproductive traits, but the AA genotype is likely to have a lethal or sterility effect.

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