Abstract:
:Asymmetric disassembly of the synaptonemal complex (SC) is crucial for proper meiotic chromosome segregation. However, the signaling mechanisms that directly regulate this process are poorly understood. Here we show that the mammalian Rho GEF homolog, ECT-2, functions through the conserved RAS/ERK MAP kinase signaling pathway in the C. elegans germline to regulate the disassembly of SC proteins. We find that SYP-2, a SC central region component, is a potential target for MPK-1-mediated phosphorylation and that constitutively phosphorylated SYP-2 impairs the disassembly of SC proteins from chromosomal domains referred to as the long arms of the bivalents. Inactivation of MAP kinase at late pachytene is critical for timely disassembly of the SC proteins from the long arms, and is dependent on the crossover (CO) promoting factors ZHP-3/RNF212/Zip3 and COSA-1/CNTD1. We propose that the conserved MAP kinase pathway coordinates CO designation with the disassembly of SC proteins to ensure accurate chromosome segregation.
journal_name
Elifejournal_title
eLifeauthors
Nadarajan S,Mohideen F,Tzur YB,Ferrandiz N,Crawley O,Montoya A,Faull P,Snijders AP,Cutillas PR,Jambhekar A,Blower MD,Martinez-Perez E,Harper JW,Colaiacovo MPdoi
10.7554/eLife.12039subject
Has Abstractpub_date
2016-02-27 00:00:00pages
e12039issn
2050-084Xjournal_volume
5pub_type
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