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2017 ; 12
(11
): e0188201
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Structure of the human chromosome interaction network
#MMPMID29141034
Sarnataro S
; Chiariello AM
; Esposito A
; Prisco A
; Nicodemi M
PLoS One
2017[]; 12
(11
): e0188201
PMID29141034
show ga
New Hi-C technologies have revealed that chromosomes have a complex network of
spatial contacts in the cell nucleus of higher organisms, whose organisation is
only partially understood. Here, we investigate the structure of such a network
in human GM12878 cells, to derive a large scale picture of nuclear architecture.
We find that the intensity of intra-chromosomal interactions is power-law
distributed. Inter-chromosomal interactions are two orders of magnitude weaker
and exponentially distributed, yet they are not randomly arranged along the
genomic sequence. Intra-chromosomal contacts broadly occur between epigenomically
homologous regions, whereas inter-chromosomal contacts are especially associated
with regions rich in highly expressed genes. Overall, genomic contacts in the
nucleus appear to be structured as a network of networks where a set of strongly
individual chromosomal units, as envisaged in the 'chromosomal territory'
scenario derived from microscopy, interact with each other via on average weaker,
yet far from random and functionally important interactions.