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Transcriptional activation of c-jun during the G0/G1 transition in mouse fibroblasts


Before quiescent cells can respond to mitogens and progress through the G1 phase of cell growth, new messenger RNA synthesis is required1. The G1 phase seems to be a critical point of control in the cell cycle, where normal cells deprived of growth factors halt cycling while transformed cells do not, suggesting that regulatory genes, uncontrolled in the neoplastic phenotype, are expressed during the G0 to G1 transition. Some of these may code for nuclear proteins that participate in the transactivation of genes required for the progression through G1. The observed changes in expression of the proto-oncogenes c-fos and c-myc, following stimulation of fibroblasts with growth factors2–7, support this notion as recent evidence suggests that c-FOS and c-MYC proteins can function as transactivating factors8–12. Moreover, the rapid induction of several genes in fibroblasts coding for putative transacting factors during the G0 to G1 transition has been recently reported13–16. Here we present the nucleotide sequence of a mouse cDNA clone coding for a 334 residue protein which shows 80% similarity with v-JUN17 and more than 98% similarity with the human c-JUN sequence18,19. We have demonstrated that in quiescent fibroblasts c-jun transcription is rapidly induced during the G0 to G1 transition.

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Ryseck, RP., Hirai, S., Yaniv, M. et al. Transcriptional activation of c-jun during the G0/G1 transition in mouse fibroblasts. Nature 334, 535–537 (1988).

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