The molecular characterization and associations of porcine cardiomyopathy asssociated 5 (CMYA5) gene with carcass trait and meat quality.

The cardiomyopathy associated 5 (CMYA5) gene was also called TRIM76, which was belonged to the tripartite motif super family of proteins (TRIM). It was a direct transcriptional target for MEF2A and it played an important role in myofibrillogenesis. In the present study, a 12056 bp cDNA sequence of the porcine CMYA5 gene was obtained by RT-PCR. The sequence encoded a large protein consisting of 4003 amino acids and the carboxyl terminus of the predicted CMYA5 protein comprised of a B-box coiled-coil, two fibronectin type III (FN3) repeats, and SPRY domains. The porcine CMYA5 gene was assigned to chromosome 2q21-24 by using the radiation hybrid (IMpRH) panel, and it was significantly linked to microsatellite Sw1602 with LOD scores of 6.74. Semi-quantitative RT-PCR revealed that the porcine CMYA5 gene was broadly expressed in all seven tissues(heart, liver, spleen, lung, kidney, skeletal muscle and adipose)harvested from different developmental stages(new born, five weeks and adult tongcheng pigs), with a high level in heart and skeletal muscle. One SNP (A7189C), leading to the amino acid alteration from the Ile residue to the Leu residue, was found and detected by BspTI PCR-restriction fragment length polymorphism. The association analysis revealed that the substitution of A7189C had significant associations with the percentage of ham (p < 0.05), water loss (p < 0.01) and intramuscular fat (p < 0.05). These results provide the evidence that the porcine CMYA5 gene can act as a potential candidate gene affecting pig meat quality.