Cloning and Expression of Bovine Polyadenylate Binding Protein 1 cDNA in Mammary Tissues

  • Kim, J.H. ;
  • Jeon, D.H. ;
  • Choi, Y.J. ;
  • Baik, M.G.
  • Received : 2000.12.04
  • Accepted : 2001.02.02
  • Published : 2001.06.01


A pregnant-induced clone was identified by differential screening from a cDNA library of bovine mammary gland. The clone was identified as a cDNA encoding a polyadenylate binding protein 1 (PABP). The cDNA clone had a total length of 1,911 nucleotides coding for 636 amino acids. The nucleotide sequence of the bovine PABP was 95% and 94% identical to those of human and mouse species, respectively. Comparison of the deduced amino acid sequences of bovine PABP with those of human species showed 100% identity. Induction of the PABP mRNA was observed in bovine mammary tissues at pregnant 7 and 8 months compared to virgin, lactating and involuted states. Expression of the PABP gene was examined in mammary epithelial HC11 cells at proliferating, differentiated and apoptotic conditions. The mRNA levels of PABP gene were similar between proliferating and differentiated cells, but expression levels were very low in apoptotic cells compared to other conditions. Results demonstrate that the PABP gene is induced during pregnancy at which stage mammary epithelial cells are actively proliferating.


Bovine;Polyadenylate Binding Protein 1 cDNA;Mammary Epithelial Cells;Lactation