A DNA sequence from the 9F region of Drosophila melanogaster polytene chromosomes was cloned. Sequencing the cloned region and its comparison with the known sequences of the D. melanogaster genome showed that the cloned DNA part contains gene sbr and adjacent sequences. The literature data on the structure and functions of genes TAP in humans and Mex67 in yeast are discussed. These genes are orthologous to the sbr gene of Drosophila and control mRNA export from the nucleus to the cytoplasm. The literature evidence is consistent with the recessive expression of mutation l(1)ts403 (sbr10) upon heat treatment that is manifested as impaired HSP synthesis at the posttranscriptional level. However, it fails to explain the semidominant effect of the mutation manifested in high frequency of meiotic sex-chromosome nondisjunction in heat-treated females. A comparison of amino-acid sequences corresponding to the products of the three orthologous genes, TAP, Mex67, and sbr, showed that the sbr gene product of Drosophila is more similar to the human TAP factor than to the Mex67 factor in yeast.
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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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