Targeting Menin disrupts the KMT2A/B and polycomb balance to paradoxically activate bivalent genes.

Targeting Menin disrupts the KMT2A/B and polycomb balance to paradoxically activate bivalent genes.
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DOI:
10.1038/s41556-022-01056-x
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发表时间:
2023-03
影响因子:
21.3
通讯作者:
Dawson MA
Dawson MA
中科院分区:
生物学1区
文献类型:
--
作者:
Sparbier CE;Gillespie A;Gomez J;Kumari N;Motazedian A;Chan KL;Bell CC;Gilan O;Chan YC;Popp S;Gough DJ;Eckersley-Maslin MA;Dawson SJ;Lehner PJ;Sutherland KD;Ernst P;McGeehan GM;Lam EYN;Burr ML;Dawson MA

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Precise control of activating H3K4me3 and repressive H3K27me3 histone modifications at bivalent promoters is essential for normal development and is frequently corrupted in cancer. By coupling a cell surface readout of bivalent MHC class I gene expression with whole genome CRISPR/Cas9 screens, we identify specific roles for MTF2-PRC2.1, PCGF1-PRC1.1 and Menin-KMT2A/B complexes in maintaining bivalency. Unexpectedly, genetic loss or pharmacological inhibition of Menin phenocopies the effects of polycomb disruption, resulting in derepression of bivalent genes in both cancer cells and pluripotent stem cells. Whilst Menin and KMT2A/B contribute to H3K4me3 at active genes, a separate Menin-independent function of KMT2A/B maintains H3K4me3 and opposes polycomb-mediated repression at bivalent genes. Release of KMT2A from active genes following Menin targeting alters the balance of polycomb and KMT2A at bivalent genes, facilitating gene activation. This functional partitioning of Menin-KMT2A/B complex components reveals therapeutic opportunities that can be leveraged through inhibition of Menin.
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