title: Regulated Fox-2 isoform expression mediates protein 4.1R splicing during erythroid differentiation.
abstract: A regulated splicing event in protein 4.1R pre-mRNA-the inclusion of exon 16-encoding peptides for spectrin-actin binding-occurs in late erythroid differentiation. We defined the functional significance of an intronic splicing enhancer, UGCAUG, and its cognate splicing factor, mFox2A, on exon 16 splicing during differentiation. UGCAUG displays cell-type-specific splicing regulation in a test neutral reporter and has a dose-dependent enhancing effect. Erythroid cells express 2 UGCAUG-binding mFox-2 isoforms, an erythroid differentiation-inducible mFox-2A and a commonly expressed mFox-2F. When overexpressed, both enhanced internal exon splicing in an UGCAUG-dependent manner, with mFox-2A exerting a much stronger effect than mFox-2F. A significant reciprocal increase in mFox-2A and decrease in mFox-2F occurred during erythroid differentiation and correlated with exon 16 inclusion. Furthermore, isoform-specific expression reduction reversed mFox-2A-enhancing activity, but not that of mFox-2F on exon 16 inclusion. Our results suggest that an erythroid differentiation-inducible mFox-2A isoform is a critical regulator of the differentiation-specific exon 16 splicing switch, and that its up-regulation in late erythroid differentiation is vital for exon 16 splicing.
authors: Department of Medical Oncology, Dana-Farber Cancer Institute, 44 Binney St, Boston, MA 02115, USA.
authors: Guang
authors: G
authors: Yang
authors: Shu-Ching
authors: SC
authors: Huang
authors: Jane Y
authors: JY
authors: Wu
authors: Edward J
authors: EJ
authors: Benz
mesh_terms: D000818:Animals; D001798:Blood Proteins / Q000235:genetics; D002454:Cell Differentiation / Q000502:physiology; D003598:Cytoskeletal Proteins / Q000235:genetics*; D024202:Electrophoretic Mobility Shift Assay; D041905:Erythroid Cells / Q000166:cytology*; D005091:Exons / Q000235:genetics; D006367:HeLa Cells; D051542:Hepatocyte Nuclear Factor 3-beta / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D006801:Humans; D007438:Introns / Q000235:genetics; D007536:Isomerism; D004915:Leukemia, Erythroblastic, Acute; D008565:Membrane Proteins / Q000235:genetics*; D051379:Mice; D008840:Microfilament Proteins; D016296:Mutagenesis; D012322:RNA Precursors / Q000378:metabolism; D012326:RNA Splicing / Q000502:physiology*
chemical_list: D001798:Blood Proteins; D003598:Cytoskeletal Proteins; C514956:Epb41 protein, mouse; C496502:FOXA2 protein, human; D008565:Membrane Proteins; D008840:Microfilament Proteins; D012322:RNA Precursors; C028841:erythrocyte membrane band 4.1 protein; D051542:Hepatocyte Nuclear Factor 3-beta
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