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Changes in histone modifications always correlate with altered transcriptional activities of genes. Recent studies have shown that the mutation of certain lysine residues to methionine in the histone variant H3.3 can act as a valuable tool to reduce specific H3 methylation levels. In our study, we used the mouse spermatogenic cell line GC-2 as a model to generate cells stably expressing H3.3 K4, H3.3 K9, H3.3 K27, and H3.3 K36M. The expression of these H3.3 K-to-M mutants influenced the expression of different subsets of genes, and a total of 891 differentially expressed genes were identified through global gene expression profiling. Moreover, the H3.3 K-to-M transgenes, especially H3.3 K36M, impacted the expression of endogenous retrovirus ERVK. This study gives a global view of how different H3 modifications regulate transcriptomes in spermatogenic cell lines, and identifies potential targets of H3 modifications in male germ line.

Histone H3 methylation orchestrates transcriptional program in mouse spermatogenic cell line