A molecular pathway homologous to the S. cerevisiae mitotic exit network (MEN) and S. pombe septation initiation network has recently been described in higher eukaryotes and involves the tumor suppressor kinase LATS1 and its subunit MOB1A. The yeast MEN/septation initiation network pathways are regulated by the ubiquitin ligase defective in mitotic arrest 1 (Dma1p), a checkpoint protein that helps maintain prometaphase arrest when cells are exposed to microtubule poisons. We identified here the RING domain protein ring finger 8 (RNF8) as the human orthologue of the yeast protein Dma1p. Like its yeast counterparts, human DMA1/RNF8 localized at the midbody and its depletion by siRNA compromised mitotic arrest of nocodazole-treated cells in a manner dependent on the MEN. Depletion of MAD2, a spindle checkpoint protein, also compromised mitotic arrest, but in a MEN-independent manner. Thus, two distinct checkpoint pathways maintain mitotic arrest in cells exposed to microtubule poisons.
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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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