23 June 2016
Continual removal of H3K9 promoter methylation by Jmjd2 demethylases is vital for ESC self-renewal and early development
Pedersen, Marianne Terndrup, Susanne Marije Kooistra, Aliaksandra Radzisheuskaya, Anne Laugesen, Jens Vilstrup Johansen, Daniel Geoffrey Hayward, Jakob Nilsson, Karl Agger & Kristian Helin (2016). Continual removal of H3K9 promoter methylation by Jmjd2 demethylases is vital for ESC self-renewal and early development. The Embo Journal, 35(12), 1-15, doi:10.15252/embj.201593317.
Chromatin‐associated proteins are essential for the specification and maintenance of cell identity. They exert these functions through modulating and maintaining transcriptional patterns. To elucidate the functions of the Jmjd2 family of H3K9/H3K36 histone demethylases, we generated conditional Jmjd2a/Kdm4a, Jmjd2b/Kdm4b andJmjd2c/Kdm4c/Gasc1 single, double and triple knockout mouse embryonic stem cells (ESCs). We report that while individual Jmjd2 family members are dispensable for ESCmaintenance and embryogenesis, combined deficiency for specifically Jmjd2a andJmjd2c leads to early embryonic lethality and impaired ESC self‐renewal, with spontaneous differentiation towards primitive endoderm under permissive culture conditions. We further show that Jmjd2a and Jmjd2c both localize to H3K4me3‐positive promoters, where they have widespread and redundant roles in preventing accumulation of H3K9me3 and H3K36me3. Jmjd2 catalytic activity is required for ESCmaintenance, and increased H3K9me3 levels in knockout ESCs compromise the expression of several Jmjd2a/c targets, including genes that are important for ESC self‐renewal. Thus, continual removal of H3K9 promoter methylation by Jmjd2 demethylases represents a novel mechanism ensuring transcriptional competence and stability of the pluripotent cell identity.