The raspberry locus of Drosophila melanogaster includes an inosine monophosphate dehydrogenase like coding sequence
| Autor: | D. Fillips, S. Hu, N.-J. Leonard, S. Y. K. Tiong, D. Nash |
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| Rok vydání: | 1994 |
| Předmět: |
Male
DNA Complementary DNA Mutational Analysis Molecular Sequence Data Restriction Mapping Genes Insect Genes Recessive Locus (genetics) Biology Open Reading Frames chemistry.chemical_compound IMP Dehydrogenase Gene mapping Drosophilidae Genetics Animals Drosophila Proteins Coding region Amino Acid Sequence Cloning Molecular Molecular Biology Gene Alleles Crosses Genetic Base Sequence Sequence Homology Amino Acid Nucleic acid sequence General Medicine biology.organism_classification Molecular biology Drosophila melanogaster chemistry Mutation DNA Transposable Elements Female Genes Lethal Sequence Alignment DNA Biotechnology |
| Zdroj: | Genome. 37:333-344 |
| ISSN: | 1480-3321 0831-2796 |
| DOI: | 10.1139/g94-046 |
| Popis: | DNA from the raspberry gene of Drosophila melanogaster has been cloned through P-element tagging of a dysgenically induced lethal allele. A transcribed DNA segment adjacent to the P insert encodes an amino acid sequence that is similar to known inosine monophosphate dehydrogenase (IMPDH) sequences. Further dysgenically induced lethals and all four known spontaneous ras eye-colour mutations have changes in the DNA either within or just upstream from the transcribed region. Identification of IMPDH as a probable product of the ras gene is compatible with the finding of an allele that requires dietary guanosine (GR), since the enzyme mediates the first of two biosynthetic steps leading from inosine monophosphate (IMP) to guanosine monophosphate (GMP). However, other auxotrophic mutants at the locus remain unexplained by the finding. The results further suggest that GMP synthesis from IMP is an essential process, despite the capacity of the fly for salvage synthesis of GMP from GR. Consideration of the phenotypes associated with mutants at the ras locus suggests that IMPDH activity is regulated in a tissue-specific manner.Key words: inosinate dehydrogenase, IMPDH, guanosine auxotrophy, purine synthesis, raspberry mutants, lethal mutations, Drosophila melanogaster. |
| Databáze: | OpenAIRE |
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