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Adenoviral early region 1A (E1A) is a viral gene that can promote cellular proliferation and de-differentiation in mammalian cells, features required for the reprogramming of somatic cells to a pluripotent state. E1A has been shown to interact with OCT4, and as a consequence, to increase OCT4 transcriptional activity. Indeed, E1A and OCT4 are sufficient to revert neuroepithelial hybrids to pluripotency, as demonstrated in previous cell fusion experiments. However, the role that E1A might play in the generation of induced pluripotent stem cells (iPSCs) has not been investigated yet. In this report, we show that E1A can generate iPSCs in combination with OCT4 and KLF4, thus replacing exogenous SOX2. The generated iPSCs are  bona fide  pluripotent cells as shown by  in vitro  and  in vivo  tests. Overall, our study suggests that E1A might replace SOX2 through enhancing OCT4 transcriptional activity at the early stages of reprogramming.

Enhanced OCT4 transcriptional activity substitutes for exogenous SOX2 in cellular reprogramming