PML Protein Organizes Heterochromatin Domains Where It Regulates Histone H3.3 Deposition by ATRX/DAXX

Overview

Journal Genome Res

Specialty Genetics

Date 2017 Mar 26

PMID 28341773

Citations 39

Authors

Erwan Delbarre

Kristina Ivanauskiene

Jane Spirkoski

Akshay Shah

Kristin Vekterud

Jan Oivind Moskaug

Stig Ove Boe

Lee H Wong

Thomas Kuntziger

Philippe Collas

Affiliations

Soon will be listed here.

Abstract

Maintenance of chromatin homeostasis involves proper delivery of histone variants to the genome. The interplay between different chaperones regulating the supply of histone variants to distinct chromatin domains remains largely undeciphered. We report a role of promyelocytic leukemia (PML) protein in the routing of histone variant H3.3 to chromatin and in the organization of megabase-size heterochromatic PML-associated domains that we call PADs. Loss of PML alters the heterochromatic state of PADs by shifting the histone H3 methylation balance from K9me3 to K27me3. Loss of PML impairs deposition of H3.3 by ATRX and DAXX in PADs but preserves the H3.3 loading function of HIRA in these regions. Our results unveil an unappreciated role of PML in the large-scale organization of chromatin and demonstrate a PML-dependent role of ATRX/DAXX in the deposition of H3.3 in PADs. Our data suggest that H3.3 loading by HIRA and ATRX-dependent H3K27 trimethylation constitute mechanisms ensuring maintenance of heterochromatin when the integrity of these domains is compromised.

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