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Updated: Apr 28, 2026

Mouse Fetal Liver Culture System to Dissect Target Gene Functions at the Early and Late Stages of Terminal Erythropoiesis

Mouse Fetal Liver Culture System to Dissect Target Gene Functions at the Early and Late Stages of Terminal Erythropoiesis

Published on: September 9, 2014

Dissecting polycomb complexes for enhanced fetal hemoglobin production.

Paul J Kaminski¹, Kristen Min¹, Elizabeth A Traxler²

¹Division of Hematology, Children's Hospital of Philadelphia, Philadelphia, PA.

Biorxiv : the Preprint Server for Biology

|April 27, 2026

Summary

Targeting Polycomb Repressive Complex 2 (PRC2) via EZH2 exon 14 skipping selectively reactivates fetal hemoglobin (HbF) production. This approach offers therapeutic potential for hemoglobinopathies like sickle cell disease and beta-thalassemia without compromising cell function.

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Area of Science:

Genetics and Epigenetics
Hematology
Molecular Biology

Background:

Polycomb repressive complexes (PRC1 and PRC2) regulate key developmental processes, including hemoglobin switching.
Reactivating fetal hemoglobin (HbF) is a therapeutic strategy for sickle cell disease and β-thalassemia.
Current PRC inhibitors have limited use due to pleiotropic effects.

Purpose of the Study:

To investigate selective perturbations of PRC1 or PRC2 components for HbF reactivation.
To determine if HbF can be induced without complete loss of PRC function.
To identify specific targets within PRC components for therapeutic intervention.

Main Methods:

High-density CRISPR-Cas9 mutagenesis screen of PRC1 and PRC2 components.
Identification and characterization of EZH2 exon 14 skipping (EZH2Δ14).
Functional assays in erythroid cells and a mouse model of human β-globin gene switching.

Main Results:

A specific region in the EZH2 subunit, inducing exon 14 skipping (EZH2Δ14), was identified.
EZH2Δ14 relieves HbF repression while largely maintaining cellular fitness.
EZH2Δ14 retains H3K27 methylation and repression of a subset of PRC target genes.
The mechanism of EZH2 control over HbF expression was confirmed in a mouse model.

Conclusions:

Partial disruption of PRC, specifically targeting non-enzymatic domains, can yield selective phenotypes.
EZH2Δ14 represents a promising strategy for selective HbF induction.
Targeting specific domains within chromatin-modifying complexes holds therapeutic potential for hemoglobinopathies.