Abstract：
:Yeast mutants lacking meiotic proteins Zip1, Zip2, Zip3, Mer3, and/or Msh5 (ZMMs) were analyzed for recombination, synaptonemal complex (SC), and meiotic progression. At 33 degrees C, recombination-initiating double-strand breaks (DSBs) and noncrossover products (NCRs) form normally while formation of single-end invasion strand exchange intermediates (SEIs), double Holliday junctions, crossover products (CRs), and SC are coordinately defective. Thus, during wild-type meiosis, recombinational interactions are differentiated into CR and NCR types very early, prior to onset of stable strand exchange and independent of SC. By implication, crossover interference does not require SC formation. We suggest that SC formation may require interference. Subsequently, CR-designated DSBs undergo a tightly coupled, ZMM-promoted transition that yields SEI-containing recombination complexes embedded in patches of SC. zmm mutant phenotypes differ strikingly at 33 degrees C and 23 degrees C, implicating higher temperature as a positive effector of recombination and identifying a checkpoint that monitors local CR-specific events, not SC formation, at late leptotene.
journal_name
Celljournal_title
Cellauthors
Börner GV,Kleckner N,Hunter Ndoi
10.1016/s0092-8674(04)00292-2subject
Has Abstractpub_date
2004-04-02 00:00:00pages
29-45issue
1eissn
0092-8674issn
1097-4172pii
S0092867404002922journal_volume
117pub_type
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