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Plos Genetics : Meiotic Chromosome Synapsis-promoting Proteins Antagonize the Anti-crossover Activity of Sgs1, Volume 2

By Haber, James E.

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Book Id: WPLBN0003923399
Format Type: PDF eBook :
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Reproduction Date: 2015

Title: Plos Genetics : Meiotic Chromosome Synapsis-promoting Proteins Antagonize the Anti-crossover Activity of Sgs1, Volume 2  
Author: Haber, James E.
Volume: Volume 2
Language: English
Subject: Journals, Science, Genetics
Collections: Periodicals: Journal and Magazine Collection, PLoS Genetics
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Publisher: Plos

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Haber, J. E. (n.d.). Plos Genetics : Meiotic Chromosome Synapsis-promoting Proteins Antagonize the Anti-crossover Activity of Sgs1, Volume 2. Retrieved from http://worldlibrary.org/


Description
Description : Sgs1, the budding yeast homolog of the mammalian BLM helicase, has been implicated in preventing excess recombination during both vegetative growth and meiosis. Most meiotic crossover (CO) recombination requires full function of a set of yeast proteins (Zip1, Zip2, Zip3, Zip4/Spo22, Mer3, Msh4, and Msh5, termed the SIC or ZMM proteins) that are also required for homologous chromosome synapsis. We report here genetic and molecular assays showing that sgs1 single mutants display relatively modest increases in CO recombination (less than 1.6-fold relative to wild-type). In contrast, a much greater CO increase is seen when an sgs1 mutation is introduced into the CO- and synapsis-deficient zip1, zip2, zip3, mer3, or msh4 mutants (2- to 8-fold increase). Furthermore, close juxtaposition of the axes of homologous chromosomes is restored. CO restoration in the mutants is not accompanied by significant changes in noncrossover (NCO) recombinant frequencies. These findings show that Sgs1 has potent meiotic anti-CO activity, which is normally antagonized by SIC/ZMM proteins. Our data reinforce previous proposals for an early separation of meiotic processes that form CO and NCO recombinants.

 

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