Chromatin effector Pygo2 mediates Wnt-notch crosstalk to suppress luminal/alveolar potential of mammary stem and basal cells.
Chromatin effector Pygo2 mediates Wnt-notch crosstalk to suppress luminal/alveolar potential of mammary stem and basal cells.
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DOI:
10.1016/j.stem.2013.04.012
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发表时间:
2013-07-03
期刊:
影响因子:
23.9
通讯作者:
Dai, Xing
中科院分区:
文献类型:
--
作者:
Gu, Bingnan;Watanabe, Kazuhide;Sun, Peng;Fallahi, Magid;Dai, Xing
Epigenetic mechanisms regulating lineage differentiation of mammary stem cells (MaSCs) remain poorly understood. Pygo2 is a histone methylation reader and a context-dependent Wnt/β-catenin co-activator. Here we provide evidence for Pygo2’s function in suppressing luminal/alveolar differentiation of MaSC-enriched basal cells. We show that Pygo2-deficient MaSC/basal cells exhibit partial molecular resemblance to luminal cells such as elevated Notch signaling and reduced mammary repopulating capability upon transplantation. Inhibition of Notch signaling suppresses basal-level and Pygo2 deficiency-induced luminal/alveolar differentiation of MaSC/basal cells, whereas activation of Wnt/β-catenin signaling suppresses luminal/alveolar differentiation and Notch3 expression in a Pygo2-dependent manner. We show that Notch3 is a direct target of Pygo2, and that Pygo2 is required for β-catenin binding and maintenance of a poised/repressed chromatin state at the Notch3 locus in MaSC/basal cells. Together, our data support a model where Pygo2-mediated chromatin regulation connects Wnt signaling and Notch signaling to restrict the luminal/alveolar differentiation competence of MaSC/basal cells.
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