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Learn MoreEarly mouse development is regulated and accompanied by dynamic changes in chromatin modifications, including G9a-mediated histone H3 lysine 9 dimethylation (H3K9me2). Previously, we provided insights into its role in post-implantation development (Zylicz et al., 2015). Here we explore the impact of depleting the maternally inherited G9a in oocytes on development shortly after fertilisation. We show that H3K9me2 normally accumulates at 8- cell stage to promote timely repression of a subset of 4-cell stage specific genes. Loss of maternal inheritance of G9a disrupts the gene regulatory network resulting in developmental delay and destabilisation of inner cell mass lineages by the late blastocyst stage. Our results indicate a vital role of this maternally inherited epigenetic regulator in creating conductive conditions for developmental progression and on cell fate choices. SOURCE: Sabine Dietmann Wellcome Trust/Medical Research Council Stem Cell Institute
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