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Bmp15 mutations and ovarian function.

S M Galloway1, S M Gregan, T Wilson

  • 1AgResearch Molecular Biology Unit, Department of Biochemistry, University of Otago, P.O. Box 56, Dunedin, New Zealand. sue.galloway@agresearch.co.nz

Molecular and Cellular Endocrinology
|June 5, 2002
PubMed
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Bone Morphogenetic Protein 15 (BMP15) mutations in sheep significantly impact ovulation rates, with heterozygotes showing increased ovulation and homozygotes becoming infertile, revealing crucial roles in mammalian folliculogenesis.

Area of Science:

  • Reproductive biology
  • Molecular endocrinology
  • Genetics

Background:

  • Bone Morphogenetic Protein 15 (BMP15), also known as growth and differentiation factor 9B (GDF9B), is an oocyte-specific member of the transforming growth factor beta (TGFbeta) superfamily.
  • BMP15 is closely related to GDF9, essential for early ovarian folliculogenesis.

Purpose of the Study:

  • To investigate the role of BMP15 in mammalian folliculogenesis, particularly highlighting differences between species.
  • To understand the impact of naturally occurring BMP15 mutations in sheep.

Main Methods:

  • Comparative analysis of BMP15 gene function in mice and sheep.
  • Examination of naturally occurring BMP15 mutations in Inverdale and Hanna sheep lines.
  • Investigation of the BMP1B receptor's role in Booroola sheep.

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Main Results:

  • BMP15 gene inactivation in mice shows minor fertility effects.
  • Heterozygous BMP15 mutations in sheep increase ovulation rate.
  • Homozygous BMP15 mutations in sheep lead to infertility.
  • A BMP1B receptor mutation in Booroola sheep is linked to increased ovulation rate.

Conclusions:

  • BMP15 plays a critical, dose-dependent role in mammalian ovarian folliculogenesis, with distinct effects observed in sheep compared to mice.
  • Naturally occurring mutations in BMP15 and related TGFbeta signaling molecules significantly influence ovulation rates and fertility in sheep.
  • Further research is needed to identify the specific granulosa cell receptor mediating BMP15 action.