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PMID: 17967867 Published · ppublish English Journal Article Research Support, Non-U.S. Gov't

Transcriptional adaptor ADA3 of Drosophila melanogaster is required for histone modification, position effect variegation, and transcription.

Molecular and cellular biology ·Vol. 28 ·No. 1 ·2008-01-00 ·Pages 376-85

Grau B, Popescu C, Torroja L, Ortuño-Sahagún D, Boros I, Ferrús A

Abstract

The Drosophila melanogaster gene diskette (also known as dik or dAda3) encodes a protein 29% identical to human ADA3, a subunit of GCN5-containing histone acetyltransferase (HAT) complexes. The fly dADA3 is a major contributor to oogenesis, and it is also required for somatic cell viability. dADA3 localizes to chromosomes, and it is significantly reduced in dGcn5 and dAda2a, but not in dAda2b, mutant backgrounds. In dAda3 mutants, acetylation at histone H3 K9 and K14, but not K18, and at histone H4 K12, but not K5, K8, and K16, is significantly reduced. Also, phosphorylation at H3 S10 is reduced in dAda3 and dGcn5 mutants. Variegation for white (w(m4)) and scute (Hw(v)) genes, caused by rearrangements of X chromosome heterochromatin, is modified in a dAda3(+) gene-dosage-dependent manner. The effect is not observed with rearrangements involving Y heterochromatin (bw(D)), euchromatin (Scutoid), or transvection effects on chromosomal pairing (white and zeste interaction). Activity of scute gene enhancers, targets for Iroquoi transcription factors, is abolished in dAda3 mutants. Also, Iroquoi-associated phenotypes are sensitive to dAda3(+) gene dosage. We conclude that dADA3 plays a role in HAT complexes which acetylate H3 and H4 at specific residues. In turn, this acetylation results in chromatin structure effects of certain rearrangements and transcription of specific genes.

MeSH Terms
Acetylation Adaptor Proteins, Signal Transducing/genetics,metabolism Animals Drosophila Proteins/classification,genetics,metabolism Drosophila melanogaster/genetics,metabolism Gene Expression Regulation Histone Acetyltransferases/classification,genetics,metabolism Histones/metabolism Mutation/genetics Phenotype Phosphorylation Transcription, Genetic/genetics X Chromosome/genetics
Chemicals
Adaptor Proteins, Signal Transducing Drosophila Proteins Histones ADA3 protein, Drosophila Histone Acetyltransferases
Authors & Affiliations
6 authors, click to expand affiliations / ORCID
Grau Benjamin
Department of Cellular, Molecular, and Developmental Neurobiology, Cajal Institute, CSIC, Ave. Dr. Arce 37, 28002 Madrid, Spain.
Popescu Cristina
Torroja Laura
Ortuño-Sahagún Daniel
Boros Imre
Ferrús Alberto
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Article Info
Journal
Molecular and cellular biology
Abbr.
Mol Cell Biol
ISSN
1098-5549
DOI
10.1128/MCB.01307-07
Published
2008-01-00
Epub
2007-00-29
Pages
376-85
Language
English
Region
United States
NLM ID
8109087
PMCID
PMC2223303
Subset
IM
External Links
PubMed source DOI: 10.1128/MCB.01307-07 PMC Full Text View journal details
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