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Curr Genet. 2002 Dec;42(3):129-39. Epub 2002 Oct 30.

Control of meiotic recombination initiation: a role for the environment?

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Department of Molecular Microbiology and Biotechnology, Tel Aviv University, Ramat Aviv 69978, Israel.


Homologous recombination plays a central role during meiosis, ensuring the proper segregation of homologous chromosomes during the first meiotic division. In addition, meiotic recombination generates genetic variability upon which natural selection can act. The frequency of recombination is not evenly distributed throughout the genome: regions of high (hotspots) and low (coldspots) recombination can be found. Meiotic hotspots exhibit high levels of double-strand break formation and these breaks coincide with the upstream regions of genes. In many cases, binding of transcription factors has been shown to be required for hotspot activity. We review the current knowledge on the mechanisms that determine hotspot activity and propose a modified model to account for recent observations which show that recombination frequency at hotspots is sensitive to environmental conditions.

[Indexed for MEDLINE]

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