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2015 ; 163
(4
): 934-46
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Stable Chromosome Condensation Revealed by Chromosome Conformation Capture
#MMPMID26544940
Eagen KP
; Hartl TA
; Kornberg RD
Cell
2015[Nov]; 163
(4
): 934-46
PMID26544940
show ga
Chemical cross-linking and DNA sequencing have revealed regions of
intra-chromosomal interaction, referred to as topologically associating domains
(TADs), interspersed with regions of little or no interaction, in interphase
nuclei. We find that TADs and the regions between them correspond with the bands
and interbands of polytene chromosomes of Drosophila. We further establish the
conservation of TADs between polytene and diploid cells of Drosophila. From
direct measurements on light micrographs of polytene chromosomes, we then deduce
the states of chromatin folding in the diploid cell nucleus. Two states of
folding, fully extended fibers containing regulatory regions and promoters, and
fibers condensed up to 10-fold containing coding regions of active genes,
constitute the euchromatin of the nuclear interior. Chromatin fibers condensed up
to 30-fold, containing coding regions of inactive genes, represent the
heterochromatin of the nuclear periphery. A convergence of molecular analysis
with direct observation thus reveals the architecture of interphase chromosomes.
|Animals
[MESH]
|Cell Nucleus/chemistry/genetics
[MESH]
|Chromosomal Puffs
[MESH]
|Diploidy
[MESH]
|Drosophila melanogaster/chemistry/cytology/*genetics/growth & development
[MESH]