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Cloning, sequencing, and localization of bovine estrogen receptor-beta within the ovarian follicle.

The potential role of estrogen receptor-beta (ERbeta) in normal ovarian folliculogenesis and in reproductive disorders such as ovarian follicular cysts has not been well defined. Therefore, we were interested in cloning, sequencing, and localizing ERbeta mRNA and protein within the bovine ovary. Bovine ERbeta (bERbeta) was amplified by reverse transcription-polymerase chain reaction (RT-PCR), then cloned and sequenced. Results showed that the open reading frame of bERbeta cDNA spanned 1584 nucleotides encoding a protein of 527 amino acids. The N-terminal region of bERbeta was found to be 80% homologous to human and mouse ERbeta and 79% homologous to rat ERbeta. Bovine ERbeta DNA-binding domain was 100% homologous to human, mouse, and rat ERbeta sequences. The C-terminal/ligand-binding domain of bERbeta was 89% homologous to human, 86% homologous to mouse, and 88% homologous to rat ERbeta. Human and bovine ERbeta amino acid sequences are similar in that their coding region extended farther 5' than initially reported for the published rat ERbeta sequence. Using in situ hybridization and immunohistochemistry, ERbeta mRNA and protein, respectively, were demonstrated to be present in granulosa cells of antral follicles in various stages of follicular growth. These findings suggest a role for bERbeta in ovarian follicular growth and maturation.[1]

References

  1. Cloning, sequencing, and localization of bovine estrogen receptor-beta within the ovarian follicle. Rosenfeld, C.S., Yuan, X., Manikkam, M., Calder, M.D., Garverick, H.A., Lubahn, D.B. Biol. Reprod. (1999) [Pubmed]
 
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