A trans-tail histone code defined by monomethylated H4 Lys-20 and H3 Lys-9 demarcates distinct regions of silent chromatin

The Journal of Biological Chemistry
Jennifer K SimsJudd C Rice

Abstract

The specific post-translational modifications of the histone proteins are associated with specific DNA-templated processes, such as transcriptional activation or repression. To investigate the biological role(s) of histone H4 lysine 20 (H4 Lys-20) methylation, we created a novel panel of antibodies that specifically detected mono-, di-, or trimethylated H4 Lys-20. We report that the different methylated forms of H4 Lys-20 are compartmentalized within visually distinct, transcriptionally silent regions in the mammalian nucleus. Interestingly, direct comparison of methylated H4 Lys-20 with the different methylated states of histone H3 lysine 9 (H3 Lys-9) revealed significant overlap and exclusion between the specific groups of methyl modifications. Trimethylated H4 Lys-20 and H3 Lys-9 were both selectively enriched within pericentric heterochromatin. Similarly, monomethylated H4 Lys-20 and H3 Lys-9 partitioned together and the dimethylated forms partitioned together within the chromosome arms; however, the mono- and dimethylated modifications were virtually exclusive. These findings strongly suggest that the combinatorial presence or absence of the different methylated states of H4 Lys-20 and H3 Lys-9 define particular types of s...Continue Reading

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