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2016 ; 44
(11
): e106
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De novo deciphering three-dimensional chromatin interaction and topological
domains by wavelet transformation of epigenetic profiles
#MMPMID27060148
Chen Y
; Wang Y
; Xuan Z
; Chen M
; Zhang MQ
Nucleic Acids Res
2016[Jun]; 44
(11
): e106
PMID27060148
show ga
Defining chromatin interaction frequencies and topological domains is a great
challenge for the annotations of genome structures. Although the chromosome
conformation capture (3C) and its derivative methods have been developed for
exploring the global interactome, they are limited by high experimental
complexity and costs. Here we describe a novel computational method, called CITD,
for de novo prediction of the chromatin interaction map by integrating histone
modification data. We used the public epigenomic data from human fibroblast IMR90
cell and embryonic stem cell (H1) to develop and test CITD, which can not only
successfully reconstruct the chromatin interaction frequencies discovered by the
Hi-C technology, but also provide additional novel details of chromosomal
organizations. We predicted the chromatin interaction frequencies, topological
domains and their states (e.g. active or repressive) for 98 additional cell types
from Roadmap Epigenomics and ENCODE projects. A total of 131 protein-coding genes
located near 78 preserved boundaries among 100 cell types are found to be
significantly enriched in functional categories of the nucleosome organization
and chromatin assembly. CITD and its predicted results can be used for
complementing the topological domains derived from limited Hi-C data and
facilitating the understanding of spatial principles underlying the chromosomal
organization.