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Co-expression and Sequence Determination of Estrogen Receptor Variant Messenger RNAs in Swine Uterus

  • Ying, C. (Department of Microbiology, Soochow University) ;
  • Chan, M.-A. (Department of Microbiology, Soochow University) ;
  • Cheng, W.T.K. (Department of Animal Sciences, National Taiwan University) ;
  • Hong, W.-F. (Department of Microbiology, Soochow University)
  • 투고 : 2003.01.14
  • 심사 : 2003.05.20
  • 발행 : 2003.12.01

초록

Steroid hormones and their receptors play an important role in reproductive process. Estrogen is intimately involved with pregnancy and its function is mediated through the estrogen receptor which has been chosen as a candidate gene to study litter size in pigs. In this study, we report that two estrogen receptor variants, designated pER-1 and pER-2 were co-expressed in the uteri of normal cycling Lan-Yu pig (Sus vittatus; a small-ear miniature in Taiwan) with the pER-1 expression level appeared to be several times higher than that of pER-2. These receptor variants were isolated using reverse transcription-PCR from the pig uteri and their sequences were determined. The pER-1 and pER-2 sequences, which are homologous to those found in other mammalian estrogen receptors, encode putative proteins consisting of 574 and 486 amino acids, respectively. A deletion in exon I was identified in both sequences, with deletion lengths of 63 bp in pER-1 and 327 bp in pER-2. The deletion in pER-1 is internal to that in pER-2 and both deletions resulted in a truncation of the B domain, which confers the transactivating activity of estrogen receptor protein. This result describes the existence of estrogen receptor variants with a deletion in exon I and implies the possibility that physiological functioning of an estrogen receptor may not require the presence of an intact B domain.

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참고문헌

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