title: The Drosophila melanogaster tumor suppressor gene lethal(3)malignant brain tumor encodes a proline-rich protein with a novel zinc finger.
abstract: The lethal(3)malignant brain tumor [t(3)mbt] gene causes, when mutated, malignant growth of the adult optic neuroblasts and ganglion mother cells in the larval brain and imaginal disc overgrowth. Via overlapping deficiencies a genomic region of approximately 6.0 kb was identified, containing l(3)mbt+ gene sequences. The l(3)mbt+ gene encodes seven transcripts of 5.8 kb, 5.65 kb, 5.35 kb, 5.25 kb, 5.0 kb, 4.4 kb and 1.8 kb. The putative MBT163 protein, encompassing 1477 amino acids, is proline-rich and contains a novel zinc finger. In situ hybridizations of whole mount embryos and larval tissues revealed l(3)mbt+ RNA ubiquitously present in stage 1 embryos and throughout embryonic development in most tissues. In third instar larvae l(3)mbt+ RNA is detected in the adult optic anlagen and the imaginal discs, the tissues directly affected by l(3)mbt mutations, but also in tissues, showing normal development in the mutant, such as the gut, the goblet cells and the hematopoietic organs.
authors.affiliation: Institut für Genetik, Johannes Gutenberg-Universität, Mainz, Germany.
authors.forename: J
authors.initials: J
authors.lastname: Wismar
authors.forename: T
authors.initials: T
authors.lastname: Löffler
authors.forename: N
authors.initials: N
authors.lastname: Habtemichael
authors.forename: O
authors.initials: O
authors.lastname: Vef
authors.forename: M
authors.initials: M
authors.lastname: Geissen
authors.forename: R
authors.initials: R
authors.lastname: Zirwes
authors.forename: W
authors.initials: W
authors.lastname: Altmeyer
authors.forename: H
authors.initials: H
authors.lastname: Sass
authors.forename: E
authors.initials: E
authors.lastname: Gateff
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D001932:Brain Neoplasms / Q000235:genetics*; D004331:Drosophila melanogaster / Q000196:embryology / Q000235:genetics*; D005260:Female; D017344:Genes, Insect; D005804:Genes, Lethal; D016147:Genes, Tumor Suppressor; D005815:Genetic Code; D016678:Genome; D007814:Larva / Q000235:genetics; D008297:Male; D008969:Molecular Sequence Data; D010455:Peptides / Q000235:genetics; D010641:Phenotype; D011392:Proline; D055232:Proline-Rich Protein Domains; D016335:Zinc Fingers
chemical_list: D010455:Peptides; D011392:Proline