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A variable topology for the 30‐nm chromatin fibre
Author(s) -
Wu Chenyi,
Bassett Andrew,
Travers Andrew
Publication year - 2007
Publication title -
embo reports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 4.584
H-Index - 184
eISSN - 1469-3178
pISSN - 1469-221X
DOI - 10.1038/sj.embor.7401115
Subject(s) - stacking , nucleosome , chromatin , topology (electrical circuits) , dna , linker , helix (gastropod) , histone , biophysics , biology , chemistry , genetics , computer science , mathematics , combinatorics , ecology , organic chemistry , snail , operating system
The structure of the 30‐nm chromatin fibre is an important determinant of the regulation of eukaryotic transcription. A fundamental issue is whether the stacking of nucleosomes in this fibre is organized as a one‐start or two‐start helix. We argue that all recent experimental data are compatible with a two‐start helix and propose that the topology of the fibre, but not the mode of stacking the nucleosomes, is dependent on the length of the linker DNA. This arrangement conserves nucleosome stacking and thus the external morphology of the fibre, and also ensures that the fibre adopts the highest available packing density.