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We have previously described the role of an essential  Saccharomyces cerevisiae  gene, important for cleavage and polyadenylation 1 ( IPA1 ), in the regulation of gene expression through its interaction with Ysh1, the endonuclease subunit of the mRNA 3′-end processing complex. Through a similar mechanism, the mammalian homolog ubiquitin protein ligase E3D (UBE3D) promotes the migratory and invasive potential of breast cancer cells, but its role in the regulation of gene expression during normal cellular differentiation has not previously been described. In this study, we show that CRISPR/Cas9-mediated knockout of  Ube3d  in 3T3-L1 cells blocks their ability to differentiate into mature adipocytes. Consistent with previous studies in other cell types,  Ube3d  knockout leads to decreased levels of CPSF73 and global changes in cellular mRNAs indicative of a loss of 3′-end processing capacity.  Ube3d  knockout cells also display decreased expression of known preadipogenic markers. Overexpression of either UBE3D or CPSF73 rescues the differentiation defect and partially restores protein levels of these markers. These results support a model in which UBE3D is necessary for the maintenance of the adipocyte-committed state via its regulation of the mRNA 3′-end processing machinery.

UBE3D Regulates mRNA 3′-End Processing and Maintains Adipogenic Potential in 3T3-L1 Cells