Trivalent chromatin marks the way in.

Hysolli, Eriona; Park, In-Hyun · Cell Stem Cell · 2013

editorial · Level V

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Abstract

Recently in Cell, Wapinski et al. (2013) investigated the epigenetic mechanisms underlying the direct conversion of fibroblasts to induced neurons (iNs). They found that Ascl1 acts as a pioneer factor at neurogenic loci marked by a closed "trivalent" chromatin state in cells permissive to direct conversion, but not in restrictive cell types.

Medical subject headings