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Histone H3 Trimethylation at Lysine 36 is Associated with Constitutive and Facultative Heterochromatin

Overview
Journal Genome Res
Specialty Genetics
Date 2011 Aug 2
PMID 21803857
Citations 71
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Abstract

The mammalian genome contains numerous regions known as facultative heterochromatin, which contribute to transcriptional silencing during development and cell differentiation. We have analyzed the pattern of histone modifications associated with facultative heterochromatin within the mouse imprinted Snurf-Snrpn cluster, which is homologous to the human Prader-Willi syndrome genomic region. We show here that the maternally inherited Snurf-Snrpn 3-Mb region, which is silenced by a potent transcription repressive mechanism, is uniformly enriched in histone methylation marks usually found in constitutive heterochromatin, such as H4K20me3, H3K9me3, and H3K79me3. Strikingly, we found that trimethylated histone H3 at lysine 36 (H3K36me3), which was previously identified as a hallmark of actively transcribed regions, is deposited onto the silenced, maternally contributed 3-Mb imprinted region. We show that H3K36me3 deposition within this large heterochromatin domain does not correlate with transcription events, suggesting the existence of an alternative pathway for the deposition of this histone modification. In addition, we demonstrate that H3K36me3 is markedly enriched at the level of pericentromeric heterochromatin in mouse embryonic stem cells and fibroblasts. This result indicates that H3K36me3 is associated with both facultative and constitutive heterochromatin. Our data suggest that H3K36me3 function is not restricted to actively transcribed regions only and may contribute to the composition of heterochromatin, in combination with other histone modifications.

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