A mouse gene encoding an oocyte antigen associated with autoimmune premature ovarian failure

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Updated: Sep 23, 2026

Using Mouse Oocytes to Assess Human Gene Function During Meiosis I
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Using Mouse Oocytes to Assess Human Gene Function During Meiosis I

Published on: April 10, 2018

Z B Tong1, L M Nelson

  • 1Section on Women's Health Research, Developmental Endocrinology Branch, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland 20892-1862, USA.

Endocrinology
|August 5, 1999
PubMed

Insights

Researchers identified a novel oocyte protein, OP1 (ooplasm-specific protein 1), in mice with autoimmune ovarian failure. This protein may be the target antigen causing infertility and premature menopause in affected females.

Area of Science:

  • Reproductive Immunology
  • Ovarian Autoimmunity
  • Molecular Biology

Background:

  • Autoimmune premature ovarian failure (POF) causes infertility and early menopause in young women.
  • A similar condition occurs in mice after thymectomy, characterized by ovarian autoimmunity.
  • This mouse model provides a valuable system for studying the mechanisms of autoimmune POF.

Purpose of the Study:

  • To identify the specific antigen targeted in postthymectomy autoimmune premature ovarian failure in mice.
  • To characterize the novel protein involved in this autoimmune response.
  • To investigate the potential role of this protein in the pathogenesis of autoimmune POF.

Main Methods:

  • Screening a mouse ovarian complementary DNA (cDNA) expression library using autoimmune serum.
  • Identifying and characterizing a novel ovarian transcript and its encoded protein.
  • Expressing and purifying the recombinant protein for immunological assays.

Main Results:

  • Identification of a novel mouse gene with a 3.75-kb ovarian transcript, exclusively expressed in oocytes.
  • The gene encodes an oocyte-specific protein, designated OP1 (ooplasm-specific protein 1), with 1111 amino acids and a predicted molecular mass of 125,502 Da.
  • Immune serum from mice with ovarian autoimmunity specifically reacted with recombinant OP1, indicating it is a target antigen.

Conclusions:

  • OP1 is an oocyte-specific protein localized to the ooplasm.
  • OP1 is a potential autoantigen involved in the development of murine autoimmune premature ovarian failure.
  • Further research into OP1 may elucidate mechanisms of autoimmune POF and inform potential therapeutic strategies.

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