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Mammalian E-type cyclins control chromosome pairing, telomere stability and CDK2 localization in male meiosis

Laetitia Martinerie1, Marcia Manterola1, Sanny S W Chung1

  • 1Departments of Genetics & Development, Columbia University Medical Center, New York, New York, United States of America.

Plos Genetics
|March 4, 2014
PubMed

Insights

E-type cyclins (cyclin E1 and E2) are crucial for male fertility. Loss of these cyclins causes severe meiotic defects, leading to reduced fertility and germ cell loss in mice.

Area of Science:

  • Cell Biology
  • Reproductive Biology
  • Genetics

Background:

  • Cyclin E1 and E2 are key regulators of the cell cycle.
  • While their role in mitosis is known, their function in male meiosis is unclear.
  • E2-deficient male mice show reduced fertility.

Purpose of the Study:

  • To investigate the role of E-type cyclins in spermatogenesis.
  • To characterize the expression patterns of cyclin E1 and E2 during male meiosis.
  • To determine the consequences of combined cyclin E1 and E2 loss in the germline.

Main Methods:

  • Analysis of cyclin E1 and E2 expression in mouse spermatocytes.
  • Generation of germline-specific Ccne1 and Ccne2 deletions.
  • Assessment of spermatogenesis, fertility, germ cell apoptosis, and meiotic chromosome dynamics.

Main Results:

  • Cyclin E2 is abundant in spermatocytes, while cyclin E1 protein levels increase upon cyclin E2 deficiency.
  • Combined loss of cyclin E1 and E2 leads to progressive spermatogenic failure, reduced fertility, and germ cell apoptosis.
  • Significant meiotic defects observed include abnormal chromosome pairing, synapsis, unrepaired DNA breaks, and disrupted telomere structure.

Conclusions:

  • E-type cyclins play a critical, previously unrecognized role in male meiosis.
  • Dysregulation of cyclin E1 and E2 function severely impairs male reproductive capacity.
  • These findings identify E-type cyclins as essential regulators of meiotic progression in males.

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