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The Sin3a repressor complex is a master regulator of STAT transcriptional activity

Laura Icardi, Raffaele Mori, Viola Gesellchen, Sven Eyckerman, Lode De Cauwer, Judith Verhelst, Koen Vercauteren, Xavier Saelens, Philip Meuleman, Geert Leroux-Roels, Karolien De Bosscher, Michael Boutros and Jan Tavernier
Proceedings of the National Academy of Sciences of the United States of America
Vol. 109, No. 30 (July 24, 2012), pp. 12058-12063
Stable URL: http://www.jstor.org/stable/41684886
Page Count: 6
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The Sin3a repressor complex is a master regulator of STAT transcriptional activity
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Abstract

Tyrosine phosphorylation is a hallmark for activation of STAT proteins, but their transcriptional activity also depends on other secondary modifications. Type I IFNs can activate both the ISGF3 (STAT1:STAT2:IRF9) complex and STAT3, but with cell-specific, selective triggering of only the ISGF3 transcriptional program. Following a genome-wide RNAi screen, we identified the SIN3 transcription regulator homolog A (Sin3a) as an important mediator of this STAT3-targeted transcriptional repression. Sin3a directly interacts with STAT3 and promotes its deacetylation. SIN3A silencing results in a prolonged nuclear retention of activated STAT3 and enhances its recruitment to the SOCS3 promoter, concomitant with histone hyperacetylation and enhanced STAT3-dependent transcription. Conversely, Sin3a is required for ISGF3-dependent gene transcription and for an efficient IFN-mediated antiviral protection against influenza A and hepatitis C viruses. The Sin3a complex therefore acts as a context-dependent ISGF3/STAT3 transcriptional switch.

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