Cloning and Sequence Analysis of Glyceraldehyde-3-Phosphate Dehydrogenase Gene in Yak

  • Li, Sheng-Wei (College of Life Sciences and Technology, Southwest University for Nationalities) ;
  • Jiang, Ming-Feng (College of Life Sciences and Technology, Southwest University for Nationalities) ;
  • Liu, Yong-Tao (College of Life Sciences and Technology, Southwest University for Nationalities) ;
  • Yang, Tu-Feng (College of Life Sciences and Technology, Southwest University for Nationalities) ;
  • Wang, Yong (College of Life Sciences and Technology, Southwest University for Nationalities) ;
  • Zhong, Jin-Cheng (College of Life Sciences and Technology, Southwest University for Nationalities)
  • Received : 2008.04.22
  • Accepted : 2008.07.18
  • Published : 2008.11.01


In order to study the biological function of gapdh gene in yak, and prove whether the gapdh gene was a useful intra-reference gene that can be given an important role in molecular biology research of yak, the cDNA sequence encoding glyceraldehyde-3-phosphate dehydrogenase from yak was cloned by the RT-PCR method using gene specific PCR primers. The sequence results indicated that the cloned cDNA fragment (1,008 bp) contained a 1,002 bp open reading frame, encoding 333 amino acids (AAs) with a molecular mass of 35.753 kDa. The deduced amino acids sequence showed a high level of sequence identity to Bos Taurus (99.70%), Xenopus laevis (94.29%), Homo sapiens (97.01%), Mus musculus (97.90%) and Sus scrofa (98.20%). The expression of yak's gapdh gene in heart, spleen, kidney and brain tissues was also detected; the results showed that the gapdh gene was expressed in all these tissues. Further analysis of yak GAPDH amino acid sequence implied that it contained a complete glyceraldehyde-3-phosphate dehydrogenase active site (ASCTTNCL) which ranged from 148 to 155 amino acid residues. It also contained two conserved domains, a NAD binding domain in its N-terminal and a complete catalytic domain of sugar transport in its C-terminal. The phylogenetic analysis showed that yak and Bos taurus were the closest species. The prediction of secondary structures indicated that GAPDH of yak had a similar secondary structure to other isolated GAPDH. The results of this study suggested that the gapdh gene of yak was similar to other species and could be used as the intra-reference to analyze the expression of other genes in yak.


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