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Laurent, Benoît; Randrianarison-Huetz, Voahangy; Frisan, Emilie; Andrieu-Soler, Charlotte; Soler, Eric; Fontenay, Michaela; Dusanter-Fourt, Isabelle; Duménil, Dominique
Journal of cell science, 2012-Feb-15, 2012-02-15, 20120215, Letnik: 125, Številka: Pt 4Journal Article
Gfi-1B is a transcriptional repressor essential for the regulation of erythropoiesis and megakaryopoiesis. Here we identify Gfi-1B p32, a Gfi-1B isoform, as essential for erythroid differentiation. Gfi-1B p32 is generated by alternative splicing and lacks the two first zinc finger domains of the protein. Selective knock down of Gfi-1B p32 compromises erythroid differentiation, whereas its ectopic expression induces erythropoiesis in the absence of erythropoietin. Gfi-1B p32 isoform binds to Gfi-1B target gene promoters and associates with the LSD1-CoREST repressor complex more efficiently than the major Gfi-1B p37 isoform. Furthermore, we show that Gfi-1B includes a KSKK motif in its SNAG domain, which recruits the repressor complex only when dimethylated on lysine 8. Mutation of lysine 8 prevents Gfi-1B p32-induced erythroid development. Our results thus highlight a key role for the alternatively spliced Gfi-1B p32 isoform in erythroid development.
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