A MTA2-SATB2 chromatin complex restrains colonic plasticity toward small intestine by retaining HNF4A at colonic chromatin

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Abstract
Summary: Plasticity between cell lineages is a fundamental but poorly understood property of regenerative tissues. In the gut tube, small intestine absorbs nutrients whereas colon absorbs electrolytes. In a striking display of inherent plasticity, adult colonic mucosa lacking the chromatin factor SATB2 is converted to small intestine. Using proteomics and CRISPR-Cas9 screen, we identified MTA2 as a crucial component of the molecular machinery that, together with SATB2, restrain colonic plasticity. MTA2 loss in adult mouse colon activated lipid absorptive genes and functional lipid uptake. Mechanistically, MTA2 co-binds with HNF4A, an activating pan-intestine transcription factor (TF), on colonic chromatin. MTA2 loss leads to HNF4A release from colonic and gain on small intestinal chromatin. SATB2 similarly restrains colonic plasticity through a HNF4A-dependent mechanism. Our study provides a generalizable model of lineage plasticity in which broadly-expressed TFs are retained on tissue-specific enhancers to maintain cell identity and prevent activation of alternative lineages; their release unleashes plasticity.
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