Identification of mutations in porcine STAT5A that contributes to the transcription of CISH .

Identification of causative genes or genetic variants associated with phenotype traits benefits the genetic improvement of animals. CISH plays a role in immunity and growth, however, the upstream transcriptional factors of porcine and the genetic variations in these factors remain unclear. In this study, we firstly identified the minimal core promoter of porcine and confirmed the existence of STATx binding sites. Overexpression and RT-qPCR demonstrated STAT5A increased transcriptional activity ( < 0.01) and mRNA expression ( < 0.01), while GATA1 inhibited transcriptional activity ( < 0.01) and the following mRNA expression ( < 0.05 or < 0.01). Then, the putative functional genetic variations of porcine were screened and a PCR-SSCP was established for genotype g.508A>C and g.566C>T. Population genetic analysis showed the A allele frequency of g.508A>C and C allele frequency of g.566C>T was 0.61 and 0.94 in Min pigs, respectively, while these two alleles were fixed in the Landrace population. Statistical analysis showed that Min piglets with CC genotype at g.566C>T or Hap1: AC had higher 28-day body weight, 35-day body weight, and ADG than TC or Hap3: CT animals ( < 0.05, < 0.05). Further luciferase activity assay demonstrated that the activity of g.508A>C in the C allele was lower than the A allele ( < 0.05). Collectively, the present study demonstrated that STAT5A positively regulated porcine transcription, and SNP g.566C>T in the was associated with the Min piglet growth trait.