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Letter

Nature Genetics 40, 1478–1483 (1 December 2008) | doi:10.1038/ng.250

Embryonic stem cell|[ndash]|specific microRNAs regulate the G1-S transition and promote rapid proliferation

Yangming Wang , Scott Baskerville , Archana Shenoy , Joshua E Babiarz , Lauren Baehner & Robert Blelloch

Dgcr8 knockout embryonic stem (ES) cells lack microprocessor activity and hence all canonical microRNAs (miRNAs). These cells proliferate slowly and accumulate in G1 phase of the cell cycle.