title: The homologous Drosophila transcriptional adaptors ADA2a and ADA2b are both required for normal development but have different functions.
abstract: In Drosophila and several other metazoan organisms, there are two genes that encode related but distinct homologs of ADA2-type transcriptional adaptors. Here we describe mutations of the two Ada2 genes of Drosophila melanogaster. By using mutant Drosophila lines, which allow the functional study of individual ADA2s, we demonstrate that both Drosophila Ada2 genes are essential. Ada2a and Ada2b null homozygotes are late-larva and late-pupa lethal, respectively. Double mutants have a phenotype identical to that of the Ada2a mutant. The overproduction of ADA2a protein from transgenes cannot rescue the defects resulting from the loss of Ada2b, nor does complementation work vice versa, indicating that the two Ada2 genes of Drosophila have different functions. An analysis of germ line mosaics generated by pole-cell transplantation revealed that the Ada2a function (similar to that reported for Ada2b) is required in the female germ line. A loss of the function of either of the Ada2 genes interferes with cell proliferation. Interestingly, the Ada2b null mutation reduces histone H3 K14 and H3 K9 acetylation and changes TAF10 localization, while the Ada2a null mutation does not. Moreover, the two ADA2s are differently required for the expression of the rosy gene, involved in eye pigment production, and for Dmp53-mediated apoptosis. The data presented here demonstrate that the two genes encoding homologous transcriptional adaptor ADA2 proteins in Drosophila are both essential but are functionally distinct.
authors.affiliation: Department of Genetics and Molecular Biology, University of Szeged, Közép Fasor 52, H-6726 Szeged, Hungary.
authors.forename: Tibor
authors.initials: T
authors.lastname: Pankotai
authors.forename: Orbán
authors.initials: O
authors.lastname: Komonyi
authors.forename: László
authors.initials: L
authors.lastname: Bodai
authors.forename: Zsuzsanna
authors.initials: Z
authors.lastname: Ujfaludi
authors.forename: Selen
authors.initials: S
authors.lastname: Muratoglu
authors.forename: Anita
authors.initials: A
authors.lastname: Ciurciu
authors.forename: László
authors.initials: L
authors.lastname: Tora
authors.forename: János
authors.initials: J
authors.lastname: Szabad
authors.forename: Imre
authors.initials: I
authors.lastname: Boros
mesh_terms: D000107:Acetylation; D000123:Acetyltransferases / Q000235:genetics / Q000502:physiology*; D000818:Animals; D002875:Chromosomes / Q000737:chemistry / Q000378:metabolism; D029721:Drosophila Proteins / Q000032:analysis / Q000235:genetics / Q000378:metabolism / Q000502:physiology*; D004331:Drosophila melanogaster / Q000235:genetics / Q000254:growth & development*; D005123:Eye / Q000378:metabolism; D005260:Female; D017344:Genes, Insect; D051548:Histone Acetyltransferases; D006657:Histones / Q000378:metabolism; D009154:Mutation; D009707:Nucleosomes / Q000378:metabolism; D010063:Ovum / Q000378:metabolism; D010641:Phenotype; D010860:Pigments, Biological / Q000235:genetics / Q000378:metabolism; D035381:TATA-Binding Protein Associated Factors / Q000032:analysis / Q000378:metabolism; D015534:Trans-Activators / Q000378:metabolism; D035362:Transcription Factor TFIID / Q000032:analysis / Q000378:metabolism; D014158:Transcription, Genetic; D019076:Transgenes; D016159:Tumor Suppressor Protein p53
chemical_list: C470558:Ada2a protein, Drosophila; D029721:Drosophila Proteins; D006657:Histones; D009707:Nucleosomes; D010860:Pigments, Biological; D035381:TATA-Binding Protein Associated Factors; C405017:Taf10 protein, Drosophila; D015534:Trans-Activators; D035362:Transcription Factor TFIID; D016159:Tumor Suppressor Protein p53; C474203:p53 protein, Drosophila; D000123:Acetyltransferases; D051548:Histone Acetyltransferases