The expansion of repressive epigenetic marks has been implicated in heterochromatin formation during embryonic development, but the general applicability of this mechanism is unclear. Here we show that nuclear rearrangement of repressive histone marks H3K9me3 and H3K27me3 into nonoverlapping structural layers characterizes senescence-associated heterochromatic foci (SAHF) formation in human fibroblasts. However, the global landscape of these repressive marks remains unchanged upon SAHF formation, suggesting that in somatic cells, heterochromatin can be formed through the spatial repositioning of pre-existing repressively marked histones. This model is reinforced by the correlation of presenescent replication timing with both the subsequent layered structure of SAHFs and the global landscape of the repressive marks, allowing us to integrate microscopic and genomic information. Furthermore, modulation of SAHF structure does not affect the occupancy of these repressive marks, nor vice versa. These experiments reveal that high-order heterochromatin formation and epigenetic remodeling of the genome can be discrete events.
%0 Journal Article
%1 pmid22795131
%A Chandra, T.
%A Kirschner, K.
%A Thuret, J. Y.
%A Pope, B. D.
%A Ryba, T.
%A Newman, S.
%A Ahmed, K.
%A Samarajiwa, S. A.
%A Salama, R.
%A Carroll, T.
%A Stark, R.
%A Janky, R.
%A Narita, M.
%A Xue, L.
%A Chicas, A.
%A N?nez, S.
%A Janknecht, R.
%A Hayashi-Takanaka, Y.
%A Wilson, M. D.
%A Marshall, A.
%A Odom, D. T.
%A Babu, M. M.
%A Bazett-Jones, D. P.
%A Tavar?, S.
%A Edwards, P. A.
%A Lowe, S. W.
%A Kimura, H.
%A Gilbert, D. M.
%A Narita, M.
%D 2012
%J Mol Cell
%K imported
%N 2
%P 203--214
%T Independence of repressive histone marks and chromatin compaction during senescent heterochromatic layer formation
%V 47
%X The expansion of repressive epigenetic marks has been implicated in heterochromatin formation during embryonic development, but the general applicability of this mechanism is unclear. Here we show that nuclear rearrangement of repressive histone marks H3K9me3 and H3K27me3 into nonoverlapping structural layers characterizes senescence-associated heterochromatic foci (SAHF) formation in human fibroblasts. However, the global landscape of these repressive marks remains unchanged upon SAHF formation, suggesting that in somatic cells, heterochromatin can be formed through the spatial repositioning of pre-existing repressively marked histones. This model is reinforced by the correlation of presenescent replication timing with both the subsequent layered structure of SAHFs and the global landscape of the repressive marks, allowing us to integrate microscopic and genomic information. Furthermore, modulation of SAHF structure does not affect the occupancy of these repressive marks, nor vice versa. These experiments reveal that high-order heterochromatin formation and epigenetic remodeling of the genome can be discrete events.
@article{pmid22795131,
abstract = {The expansion of repressive epigenetic marks has been implicated in heterochromatin formation during embryonic development, but the general applicability of this mechanism is unclear. Here we show that nuclear rearrangement of repressive histone marks H3K9me3 and H3K27me3 into nonoverlapping structural layers characterizes senescence-associated heterochromatic foci (SAHF) formation in human fibroblasts. However, the global landscape of these repressive marks remains unchanged upon SAHF formation, suggesting that in somatic cells, heterochromatin can be formed through the spatial repositioning of pre-existing repressively marked histones. This model is reinforced by the correlation of presenescent replication timing with both the subsequent layered structure of SAHFs and the global landscape of the repressive marks, allowing us to integrate microscopic and genomic information. Furthermore, modulation of SAHF structure does not affect the occupancy of these repressive marks, nor vice versa. These experiments reveal that high-order heterochromatin formation and epigenetic remodeling of the genome can be discrete events.},
added-at = {2021-01-14T21:21:20.000+0100},
author = {Chandra, T. and Kirschner, K. and Thuret, J. Y. and Pope, B. D. and Ryba, T. and Newman, S. and Ahmed, K. and Samarajiwa, S. A. and Salama, R. and Carroll, T. and Stark, R. and Janky, R. and Narita, M. and Xue, L. and Chicas, A. and N?nez, S. and Janknecht, R. and Hayashi-Takanaka, Y. and Wilson, M. D. and Marshall, A. and Odom, D. T. and Babu, M. M. and Bazett-Jones, D. P. and Tavar?, S. and Edwards, P. A. and Lowe, S. W. and Kimura, H. and Gilbert, D. M. and Narita, M.},
biburl = {https://www.bibsonomy.org/bibtex/2d945338a348b1014435821d44caeec0c/mbgroup},
interhash = {4b154d25ea2328d99a8729fae08bedb6},
intrahash = {d945338a348b1014435821d44caeec0c},
journal = {Mol Cell},
keywords = {imported},
month = Jul,
number = 2,
pages = {203--214},
timestamp = {2021-01-14T21:21:20.000+0100},
title = {{{I}ndependence of repressive histone marks and chromatin compaction during senescent heterochromatic layer formation}},
volume = 47,
year = 2012
}