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.
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| Evidence ID | Analyze ID | Gene | Gene Systematic Name | Qualifier | Gene Ontology Term ID | Gene Ontology Term | Aspect | Annotation Extension | Evidence | Method | Source | Assigned On | Reference |
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| Evidence ID | Analyze ID | Gene | Gene Systematic Name | Phenotype | Experiment Type | Experiment Type Category | Mutant Information | Strain Background | Chemical | Details | Reference |
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| Evidence ID | Analyze ID | Gene | Gene Systematic Name | Disease Ontology Term | Disease Ontology Term ID | Qualifier | Evidence | Method | Source | Assigned On | Reference |
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| Evidence ID | Analyze ID | Regulator | Regulator Systematic Name | Target | Target Systematic Name | Direction | Regulation of | Happens During | Regulator Type | Direction | Regulation Of | Happens During | Method | Evidence | Strain Background | Reference |
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| Site | Modification | Modifier | Source | Reference |
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| Evidence ID | Analyze ID | Interactor | Interactor Systematic Name | Interactor | Interactor Systematic Name | Type | Assay | Annotation | Action | Modification | Phenotype | Source | Reference | Note |
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| Evidence ID | Analyze ID | Dataset | Description | Keywords | Number of Conditions | Reference |
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