title: Identification and expression analysis of alternative transcripts of the mouse GA-binding protein (Gabp) subunits alpha and beta1.
abstract: The erythroblast transformation specific (ETS) transcription factor GA-binding protein (Gabp) is widely expressed and acts on a diverse range of target genes, including nuclear-encoded mitochondrial proteins and neuromuscular-specific genes. The GABPalpha subunit contains an ETS DNA binding domain and the beta subunit contains a nuclear localization signal (NLS) and transactivation domain. Here, we show coincident expression of Gabpalpha and beta1 throughout mouse embryogenesis, consistent with the gene products functioning in a complex. We have also identified 2 alternatively spliced, tissue-specific exons 1 (5' untranslated regions) of mouse Gabpalpha and 4 alternative 3' polyadenylation signals that, in combination, result in 12 transcripts for Gabpalpha. These alternative transcripts are suggested to have altered stability, subcellular localization and/or translation efficiency. Further, we identified nine differentially expressed splice variants of mouse Gabpbeta1 that encode beta protein forms lacking functional domains, suggesting a dominant negative function. Together, alternative transcripts of Gabpalpha and beta1 provide a mechanism for tissue-specific regulation of Gabp activity.
authors.affiliation: Centre for Functional Genomics and Human Disease, Monash Institute of Reproduction and Development, Monash Medical Centre, Monash University, Clayton 246 Clayton Road, Clayton, Victoria 3168, Australia.
authors.forename: Debra A
authors.initials: DA
authors.lastname: O'Leary
authors.forename: Daniela
authors.initials: D
authors.lastname: Koleski
authors.forename: Ismail
authors.initials: I
authors.lastname: Kola
authors.forename: Paul J
authors.initials: PJ
authors.lastname: Hertzog
authors.forename: Sika
authors.initials: S
authors.lastname: Ristevski
mesh_terms: D016475:3T3 Cells; D017398:Alternative Splicing / Q000235:genetics*; D000818:Animals; D001665:Binding Sites / Q000235:genetics; D018076:DNA, Complementary / Q000737:chemistry / Q000235:genetics; D004268:DNA-Binding Proteins / Q000235:genetics*; D004622:Embryo, Mammalian / Q000378:metabolism; D005260:Female; D051268:GA-Binding Protein Transcription Factor; D020869:Gene Expression Profiling; D018507:Gene Expression Regulation, Developmental; D017403:In Situ Hybridization; D008156:Luciferases / Q000235:genetics / Q000378:metabolism; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D008808:Mice, Inbred CBA; D008969:Molecular Sequence Data; D011401:Promoter Regions, Genetic / Q000235:genetics; D021122:Protein Subunits / Q000235:genetics; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D017422:Sequence Analysis, DNA; D014157:Transcription Factors / Q000235:genetics*; D014158:Transcription, Genetic / Q000235:genetics
chemical_list: D018076:DNA, Complementary; D004268:DNA-Binding Proteins; D051268:GA-Binding Protein Transcription Factor; C495656:Gabpa protein, mouse; C495658:Gabpb1 protein, mouse; D021122:Protein Subunits; D012333:RNA, Messenger; D011993:Recombinant Fusion Proteins; D014157:Transcription Factors; D008156:Luciferases