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The Autism-Related Protein SETD5 Controls Neural Cell Proliferation Through Epigenetic Regulation of RDNA Expression

Overview
Journal iScience
Publisher Cell Press
Date 2020 Apr 17
PMID 32299058
Citations 14
Authors
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Abstract

Haploinsufficiency of SETD5 is implicated in syndromic autism spectrum disorder (ASD), but the molecular mechanism underlying the pathological role of this protein has remained unclear. We have now shown that Setd5 mice manifest ASD-related behavioral phenotypes and that the expression of ribosomal protein genes and rDNA is disturbed in the brain of these mice. SETD5 recruited the HDAC3 complex to the rDNA promoter, resulting in removal of the histone mark H4K16ac and its reader protein TIP5, a repressor of rDNA expression. Depletion of SETD5 attenuated rDNA expression, translational activity, and neural cell proliferation, whereas ablation of TIP5 in SETD5-deficient cells rescued these effects. Translation of cyclin D1 mRNA was specifically down-regulated in SETD5-insufficient cells. Our results thus suggest that SETD5 positively regulates rDNA expression via an HDAC3-mediated epigenetic mechanism and that such regulation is essential for translation of cyclin D1 mRNA and neural cell proliferation.

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