A newly isolated mutant, mus-23, of Neurospora crassa was found to be highly sensitive to a wide variety of mutagens, including UV light, methyl methanesulfonate, 4-nitroquinoline 1-oxide, N-methyl-N'-nitro-N-nitrosoguanidine and tert-butyl hydroperoxide. This mutant was originally isolated as a mutant that could not grow on medium containing histidine. Meiosis and sporulation were defective in homozygous crosses between mus-23 haploids. The mus-23 gene is located on the right arm of LGII, between fl and trp-3. Analyses of epistasis between mus-23 and other mutations that cause defects in DNA repair indicated that the mus-23 gene belongs to the same DNA repair group as mei-3, which is the Neurospora homolog of the Saccharomyces cerevisiae gene RAD51. The double mutant carrying mus-23 and uvs-3 mutations was lethal. The mus-23 gene was cloned by complementation of the MMS-sensitive phenotype of the mus-23 mutant. The gene contained an open reading frame of 1578 bp and did not contain any introns. The molecular weight of the predicted mus-23 gene product was 60.4 kDa. Computer analyses revealed that the MUS23 protein has significant homology to Mre11p, which is known to be involved in recombinational repair in S. cerevisiae. The level of mus-23 transcripts increased significantly within 60 min of treatment with UV or MMS and then gradually decreased. The role of MUS23 protein in recombinational repair is discussed.
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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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