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.

journal_name

Mol Cell Biol

authors

Pankotai T,Komonyi O,Bodai L,Ujfaludi Z,Muratoglu S,Ciurciu A,Tora L,Szabad J,Boros I

doi

10.1128/MCB.25.18.8215-8227.2005

subject

Has Abstract

pub_date

2005-09-01 00:00:00

pages

8215-27

issue

18

eissn

0270-7306

issn

1098-5549

pii

25/18/8215

journal_volume

25

pub_type

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