BMP-SMAD-ID promotes reprogramming to pluripotency by inhibiting p16/INK4A-dependent senescence

Significance The development of iPSCs provides unprecedented opportunities for life sciences, drug discovery, and regenerative medicine. The efficiency of iPSC generation is quite low: typically less than 1% of human primary somatic cells that have received reprogramming factors turn into iPSCs. Previous studies revealed that cellular senescence was a major barrier to iPSC generation. In this study using human FOP mutant cells, we provide evidence that the BMP-SMAD-ID signaling suppressed p16/INK4A-mediated cellular senescence during the early phase in iPSC generation. These results are unexpected because BMP-SMAD signaling has negative effects on the self-renewal of human iPSCs. Here, we show that a human natural mutation increases the efficiency of iPSC generation. Fibrodysplasia ossificans progressiva (FOP) patients carry a missense mutation in ACVR1 [617G > A (R206H)] that leads to hyperactivation of BMP-SMAD signaling. Contrary to a previous study, here we show that FOP fibroblasts showed an increased efficiency of induced pluripotent stem cell (iPSC) generation. This positive effect was attenuated by inhibitors of BMP-SMAD signaling (Dorsomorphin or LDN1931890) or transducing inhibitory SMADs (SMAD6 or SMAD7). In normal fibroblasts, the efficiency of iPSC generation was enhanced by transducing mutant ACVR1 (617G > A) or SMAD1 or adding BMP4 protein at early times during the reprogramming. In contrast, adding BMP4 at later times decreased iPSC generation. ID genes, transcriptional targets of BMP-SMAD signaling, were critical for iPSC generation. The BMP-SMAD-ID signaling axis suppressed p16/INK4A-mediated cell senescence, a major barrier to reprogramming. These results using patient cells carrying the ACVR1 R206H mutation reveal how cellular signaling and gene expression change during the reprogramming processes.

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