Histone Variant MacroH2A1 Plays an Isoform-Specific Role in Suppressing Epithelial-Mesenchymal Transition

Dayle Q. Hodge, Jihong Cui, Matthew J. Gamble, Wenjun Guo

Research output: Contribution to journalArticle

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Abstract

Epithelial-Mesenchymal Transition (EMT) is a biological program that plays key roles in various developmental and pathological processes. Although much work has been done on signaling pathways and transcription factors regulating EMT, the epigenetic regulation of EMT remains not well understood. Histone variants have been recognized as a key group of epigenetic regulators. Among them, macroH2A1 is involved in stem cell reprogramming and cancer progression. We postulated that macroH2A1 may play a role in EMT, a process involving reprogramming of cellular states. In this study, we demonstrate that expression of macroH2A1 is dramatically reduced during EMT induction in immortalized human mammary epithelial cells (HMLE). Moreover, ectopic expression of the macroH2A1.1 isoform, but not macroH2A1.2, can suppress EMT induction and reduce the stem-like cell population in HMLE. Interestingly, macroH2A1.1 overexpression cannot revert stable mesenchymal cells back to the epithelial state, suggesting a stage-specific role of macroH2A1.1 in EMT. We further pinpointed that the function of macroH2A1.1 in EMT suppression is dependent on its ability to bind the NAD+ metabolite PAR, in agreement with the inability to suppress EMT by macroH2A1.2, which lacks the PAR binding domain. Thus, our work discovered a previously unrecognized isoform-specific function of macroH2A1 in regulating EMT induction.

Original languageEnglish (US)
Article number841
JournalScientific Reports
Volume8
Issue number1
DOIs
StatePublished - Dec 1 2018

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Epithelial-Mesenchymal Transition
Histones
Protein Isoforms
Epigenomics
Stem Cells
Pathologic Processes
NAD
Breast
Transcription Factors
Epithelial Cells

ASJC Scopus subject areas

  • General

Cite this

Histone Variant MacroH2A1 Plays an Isoform-Specific Role in Suppressing Epithelial-Mesenchymal Transition. / Hodge, Dayle Q.; Cui, Jihong; Gamble, Matthew J.; Guo, Wenjun.

In: Scientific Reports, Vol. 8, No. 1, 841, 01.12.2018.

Research output: Contribution to journalArticle

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