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Sequential transformations of human sperm nucleus in human egg.

B Lassalle1, J Testart

  • 1INSERM Unité 187, Clamart, France.

Journal of Reproduction and Fertility
|March 1, 1991
PubMed
Summary
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This study details the transformation of sperm nuclei into male pronuclei in human eggs, revealing a three-phase process. Abnormal maternal meiosis consistently halted sperm development, suggesting shared regulatory factors.

Area of Science:

  • Reproductive Biology
  • Developmental Biology
  • Cell Biology

Background:

  • Understanding sperm nucleus transformation into male pronuclei is crucial for human fertilization.
  • Previous studies have not fully elucidated the sequential morphological events and timing of this process.

Purpose of the Study:

  • To investigate the time course and morphological changes during human sperm nucleus development into male pronuclei.
  • To examine the relationship between maternal meiosis progression and sperm nuclear development.

Main Methods:

  • In-vitro insemination of human zona-free oocytes.
  • Culture in a CO2 incubator and slide-coverslip preparations for microscopy.
  • Microscopical observation of sperm nuclear and maternal meiotic events over 3.5 hours.

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Main Results:

  • Sperm nuclear development into male pronuclei follows a three-phase sequence: decondensation, partial recondensation, and expansion.
  • Prepronuclear stages (phases 1 & 2) each lasted approximately 60 minutes; pronuclear formation (phase 3) began 120-170 minutes post-insemination.
  • Abnormal maternal meiosis arrest was consistently associated with halted sperm nuclear development, with specific arrests at decondensed or recondensed stages.

Conclusions:

  • Human sperm nuclear transformation into male pronuclei is a precisely timed, multi-phase process.
  • Maternal chromatin status appears to regulate sperm nuclear development, suggesting common regulatory factors.
  • These findings provide insights into early fertilization events and potential causes of fertilization failure.