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2017 ; 8
(1
): 441
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English Wikipedia
Topologically associating domains are ancient features that coincide with
Metazoan clusters of extreme noncoding conservation
#MMPMID28874668
Harmston N
; Ing-Simmons E
; Tan G
; Perry M
; Merkenschlager M
; Lenhard B
Nat Commun
2017[Sep]; 8
(1
): 441
PMID28874668
show ga
Developmental genes in metazoan genomes are surrounded by dense clusters of
conserved noncoding elements (CNEs). CNEs exhibit unexplained extreme levels of
sequence conservation, with many acting as developmental long-range enhancers.
Clusters of CNEs define the span of regulatory inputs for many important
developmental regulators and have been described previously as genomic regulatory
blocks (GRBs). Their function and distribution around important regulatory genes
raises the question of how they relate to 3D conformation of these loci. Here, we
show that clusters of CNEs strongly coincide with topological organisation,
predicting the boundaries of hundreds of topologically associating domains (TADs)
in human and Drosophila. The set of TADs that are associated with high levels of
noncoding conservation exhibit distinct properties compared to TADs devoid of
extreme noncoding conservation. The close correspondence between extreme
noncoding conservation and TADs suggests that these TADs are ancient, revealing a
regulatory architecture conserved over hundreds of millions of years.Metazoan
genomes contain many clusters of conserved noncoding elements. Here, the authors
provide evidence that these clusters coincide with distinct topologically
associating domains in humans and Drosophila, revealing a conserved regulatory
genomic architecture.