We have analyzed the CTF1 gene, identified in a screen for mutants with decreased chromosome transmission fidelity and shown to correspond to the previously identified chl1 mutation. Chl1 null mutants exhibited a 200-fold increase in the rate of chromosome III missegregation per cell division, and near wild-type rates of marker homozygosis on this chromosome by mitotic recombination. Analysis of the segregation of a marker chromosome indicated that sister chromatid loss (1:0 segregation) and sister chromatid non-disjunction (2:0 segregation) contributed equally to chromosome missegregation. A genomic clone of CHL1 was isolated and used to map its physical position on chromosome XVI. Nucleotide sequence analysis of CHL1 revealed a 2.6 kb open reading frame with a 99 kd predicted protein sequence that contained two PEST sequences and was 23% identical to the coding region of a nucleotide excision repair gene, RAD3. Domains of homology between these two predicted protein sequences included a helix-turn-helix motif and an ATP binding site containing a helicase consensus. Mutants lacking the CHL1 gene product are viable and display two striking, and perhaps interrelated, phenotypes: extreme chromosome instability and a delay in cell cycle progression in G2/M. This delay is independent of the cell cycle checkpoint that requires the function of the RAD9 gene.
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Evidence ID | Analyze ID | Gene/Complex | Systematic Name/Complex Accession | 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 | Allele | Assay | Annotation | Action | Phenotype | SGA score | P-value | Source | Reference | Note |
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Evidence ID | Analyze ID | Interactor | Interactor Systematic Name | Interactor | Interactor Systematic Name | Assay | Annotation | Action | Modification | Source | Reference | Note |
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Complement ID | Locus ID | Gene | Species | Gene ID | Strain background | Direction | Details | Source | Reference |
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Evidence ID | Analyze ID | Dataset | Description | Keywords | Number of Conditions | Reference |
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