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Body and organ size regulation in mammals involves multiple signaling pathways and remains largely enigmatic. Here, we report that Pum1 and Pum2, which encode highly conserved PUF RNA-binding proteins, regulate mouse body and organ size by post-transcriptional repression of the cell cycle inhibitor Cdkn1b. Binding of PUM1 or PUM2 to Pumilio binding elements (PBEs) in the 3' UTR of Cdkn1b inhibits translation, promoting G1-S transition and cell proliferation. Mice with null mutations in Pum1 and Pum2 exhibit gene dosage-dependent reductions in body and organ size, and deficiency for Cdkn1b partially rescues postnatal growth defects in Pum1-/- mice. We propose that coordinated tissue-specific expression of Pum1 and Pum2, which involves auto-regulatory and reciprocal post-transcriptional repression, contributes to the precise regulation of body and organ size. Hence PUM-mediated post-transcriptional control of cell cycle regulators represents an additional layer of control in the genetic regulation of organ and body size.
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