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Fungal Biol Rev. 2015 Dec 1;29(3-4):220-229.

Contrasted patterns in mating-type chromosomes in fungi: hotspots versus coldspots of recombination.

Author information

1
School of BioSciences, University of Melbourne, VIC 3010, Australia.
2
Department of Biology, Amherst College, Amherst, Massachusetts 01002 USA.
3
Department of Evolutionary Biology, Uppsala University, Norbyvägen 18D, 752 36 Uppsala, Sweden.
4
Laboratoire Ecologie, Systématique et Evolution, UMR 8079 CNRS-UPS-AgroParisTech, Bâtiment 360, Université Paris-Sud, 91405 Orsay cedex, France.

Abstract

It is striking that, while central to sexual reproduction, the genomic regions determining sex or mating-types are often characterized by suppressed recombination that leads to a decrease in the efficiency of selection, shelters genetic load, and inevitably contributes to their genic degeneration. Research on model and lesser-explored fungi has revealed similarities in recombination suppression of the genomic regions involved in mating compatibility across eukaryotes, but fungi also provide opposite examples of enhanced recombination in the genomic regions that determine their mating types. These contrasted patterns of genetic recombination (sensu lato, including gene conversion and ectopic recombination) in regions of the genome involved in mating compatibility point to important yet complex processes occurring in their evolution. A number of pieces in this puzzle remain to be solved, in particular on the unclear selective forces that may cause the patterns of recombination, prompting theoretical developments and experimental studies. This review thus points to fungi as a fascinating group for studying the various evolutionary forces at play in the genomic regions involved in mating compatibility.

KEYWORDS:

Cryptococcus neoformans; MAT; Microbotryum violaceum; Muller’s ratchet; Neurospora tetrasperma; Podospora anserina; bipolar; heterothallism; homothallism; tetrapolar

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