Contrasted patterns of crossover and non-crossover at Arabidopsis thaliana meiotic recombination hotspots.

Abstract:

:The vast majority of meiotic recombination events (crossovers (COs) and non-crossovers (NCOs)) cluster in narrow hotspots surrounded by large regions devoid of recombinational activity. Here, using a new molecular approach in plants, called "pollen-typing", we detected and characterized hundreds of CO and NCO molecules in two different hotspot regions in Arabidopsis thaliana. This analysis revealed that COs are concentrated in regions of a few kilobases where their rates reach up to 50 times the genome average. The hotspots themselves tend to cluster in regions less than 8 kilobases in size with overlapping CO distribution. Non-crossover (NCO) events also occurred in the two hotspots but at very different levels (local CO/NCO ratios of 1/1 and 30/1) and their track lengths were quite small (a few hundred base pairs). We also showed that the ZMM protein MSH4 plays a role in CO formation and somewhat unexpectedly we also found that it is involved in the generation of NCOs but with a different level of effect. Finally, factors acting in cis and in trans appear to shape the rate and distribution of COs at meiotic recombination hotspots.

journal_name

PLoS Genet

journal_title

PLoS genetics

authors

Drouaud J,Khademian H,Giraut L,Zanni V,Bellalou S,Henderson IR,Falque M,Mézard C

doi

10.1371/journal.pgen.1003922

subject

Has Abstract

pub_date

2013-11-01 00:00:00

pages

e1003922

issue

11

eissn

1553-7390

issn

1553-7404

pii

PGENETICS-D-13-01788

journal_volume

9

pub_type

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