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- W4367043046 abstract "The human genome can be demarcated into domains based on distinct epigenetic states. The trimethylation of histone H3 lysine 9 (H3K9me3) is essential for the formation of constitutive heterochromatin nanodomains. However, the extent to which genomic regions require specific densities or degrees of H3K9me3 for stable interactions remains unclear. Here we utilize CRISPR-based DNA imaging to investigate the role of endogenous or ectopic H3K9me3 in chromatin dynamics and genomic interactions. We select three loci (IDR3, TCF3, and PR1) with distinct levels of H3K9me3 to examine the genomic interactions and association with endogenous Heterochromatin Protein 1 (HP1α) condensates. Our results demonstrate a positive correlation between the levels of H3K9me3 at the loci and their association with HP1α condensates. By dual-color labeling and long-term tracking of IDR3 and PR1 loci, we find a periodical association between the two ranging from one to three hours. Epigenetic perturbation-induced Genome organization (EpiGo)-KRAB introduces ∼20 kilobases of H3K9me3 at the TCF3 locus, which is sufficient to establish a stable association between TCF3 and HP1α condensates. In addition, EpiGo-mediated H3K9me3 also leads to stable genomic interaction between IDR3 and TCF3. Briefly, these data suggest that the density of H3K9me3 could dictate the stability of interactions between genomic loci and HP1α condensates." @default.
- W4367043046 created "2023-04-27" @default.
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- W4367043046 date "2023-04-01" @default.
- W4367043046 modified "2023-10-16" @default.
- W4367043046 title "The local density of H3K9me3 dictates the stability of HP1α condensates-mediated genomic interactions" @default.
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- W4367043046 doi "https://doi.org/10.1016/j.jgg.2023.04.006" @default.
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