title: Ikaros SUMOylation: switching out of repression.
abstract: Ikaros plays a key role in lymphocyte development and homeostasis by both potentiating and repressing gene expression. Here we show that Ikaros interacts with components of the SUMO pathway and is SUMOylated in vivo. Two SUMOylation sites are identified on Ikaros whose simultaneous modification results in a loss of Ikaros' repression function. Ikaros SUMOylation disrupts its participation in both histone deacetylase (HDAC)-dependent and HDAC-independent repression but does not influence its nuclear localization into pericentromeric heterochromatin. These studies reveal a new dynamic way by which Ikaros-mediated gene repression is controlled by SUMOylation.
authors.affiliation: Cutaneous Biology Research Center, Massachusetts General Hospital, Harvard Medical School, Charlestown, MA 02129, USA.
authors.forename: Pablo
authors.initials: P
authors.lastname: Gómez-del Arco
authors.forename: Joseph
authors.initials: J
authors.lastname: Koipally
authors.forename: Katia
authors.initials: K
authors.lastname: Georgopoulos
mesh_terms: D021581:Active Transport, Cell Nucleus; D000818:Animals; D001665:Binding Sites; D019759:Carbon-Nitrogen Lyases / Q000378:metabolism; D002478:Cells, Cultured; D002503:Centromere / Q000378:metabolism; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D006570:Heterochromatin / Q000378:metabolism; D006801:Humans; D051740:Ikaros Transcription Factor; D008214:Lymphocytes / Q000378:metabolism; D051379:Mice; D009154:Mutation / Q000235:genetics; D012097:Repressor Proteins / Q000235:genetics / Q000378:metabolism; D025842:SUMO-1 Protein / Q000235:genetics / Q000378:metabolism*; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism*; D014158:Transcription, Genetic / Q000235:genetics; D044767:Ubiquitin-Protein Ligases / Q000378:metabolism
chemical_list: D004268:DNA-Binding Proteins; D006570:Heterochromatin; C497239:IKZF1 protein, human; D012097:Repressor Proteins; D025842:SUMO-1 Protein; D014157:Transcription Factors; C497238:Zfpn1a1 protein, mouse; D051740:Ikaros Transcription Factor; D044767:Ubiquitin-Protein Ligases; D019759:Carbon-Nitrogen Lyases; C034300:isopeptidase