What question did this study set out to answer?

Investigate the role of promoter CpG methylation in silencing fetal globin genes (HBG1 and HBG2) and determine whether targeted epigenomic editing can reverse this repression.

July 27, 2025Nature CommunicationsOpen Access

Removal of promoter CpG methylation by epigenome editing reverses HBG silencing

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Authors

HBHenry W. BellUNSW Sydney RFRuopeng FengSt. Jude Children's Research Hospital MSManan ShahUniversity of Iowa

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Experimental study reveals targeted promoter demethylation reactivates fetal hemoglobin expression in human erythroid cells, highlighting an epigenetic therapeutic strategy for...

Key Points

Investigate the role of promoter CpG methylation in silencing fetal globin genes (HBG1 and HBG2) and determine whether targeted epigenomic editing can reverse this repression.
Conducted a CRISPR/Cas9 screen in adult HUDEP-2 erythroid cells to identify epigenetic regulators mediating HBG gene silencing.
Performed targeted promoter demethylation and localized re-methylation, alongside MBD2 perturbation, in HUDEP-2 cells and primary human CD34+ cell-derived erythroblasts.
Identified the DNMT1-associated factor UHRF1 as an HBG repressor, whose loss induced global demethylation and gene activation that localized promoter re-methylation reversed.
Targeted epigenome editing directly removed promoter CpG methylation and robustly reactivated HBG expression in HUDEP-2 and primary CD34+ erythroblasts, mirroring the effects of MBD2 inactivation.

Cite This Study

Bell et al. (2025) studied this question.

synapsesocial.com/papers/6a816d2ad7cc3676436630ed https://doi.org/10.1038/s41467-025-62177-z

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Implication

Experimental study reveals targeted promoter demethylation reactivates fetal hemoglobin expression in human erythroid cells, highlighting an epigenetic therapeutic strategy for...

Removal of promoter CpG methylation by epigenome editing reverses HBG silencing

Discussion

Member takes

Implication

Key Points

Cite This Study

Removal of promoter CpG methylation by epigenome editing reverses HBG silencing

Discussion

Member takes

Implication

Key Points

Cite This Study

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