Genetic analysis of chromosome pairing, recombination, and cell cycle control during first meiotic prophase in mammals

Endocr Rev. 2006 Jun;27(4):398-426. doi: 10.1210/er.2005-0017. Epub 2006 Mar 16.

Abstract

Meiosis is a double-division process that is preceded by only one DNA replication event to produce haploid gametes. The defining event in meiosis is prophase I, during which chromosome pairs locate each other, become physically connected, and exchange genetic information. Although many aspects of this process have been elucidated in lower organisms, there has been scant information available until now about the process in mammals. Recent advances in genetic analysis, especially in mice and humans, have revealed many genes that play essential roles in meiosis in mammals. These include cell cycle-regulatory proteins that couple the exit from the premeiotic DNA synthesis to the progression through prophase I, the chromosome structural proteins involved in synapsis, and the repair and recombination proteins that process the recombination events. Failure to adequately repair the DNA damage caused by recombination triggers meiotic checkpoints that result in ablation of the germ cells by apoptosis. These analyses have revealed surprising sexual dimorphism in the requirements of different gene products and a much less stringent checkpoint regulation in females. This may provide an explanation for the 10-fold increase in meiotic errors in females compared with males. This review provides a comprehensive analysis of the use of genetic manipulation, particularly in mice, but also of the analysis of mutations in humans, to elucidate the mechanisms that are required for traverse through prophase I.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't
  • Review

MeSH terms

  • Animals
  • BRCA1 Protein / genetics
  • BRCA1 Protein / physiology
  • Cell Cycle Proteins / genetics
  • Cell Cycle Proteins / physiology*
  • Chromosome Pairing / genetics
  • Chromosome Pairing / physiology*
  • DNA Helicases / genetics
  • DNA Helicases / physiology
  • DNA Repair / physiology
  • DNA Repair-Deficiency Disorders / genetics
  • DNA Repair-Deficiency Disorders / physiopathology
  • Humans
  • Meiotic Prophase I / genetics
  • Meiotic Prophase I / physiology
  • Mutation
  • Recombination, Genetic / physiology*

Substances

  • BRCA1 Protein
  • Cell Cycle Proteins
  • DNA Helicases