Defining functionally relevant spatial chromatin domains: it's a TAD complicated.
Fiche publication
Date publication
décembre 2019
Journal
Journal of molecular biology
Auteurs
Membres identifiés du Cancéropôle Est :
Dr SEXTON Thomas
Tous les auteurs :
Sikorska N, Sexton T
Lien Pubmed
Résumé
Chromosome conformation capture and orthologous methods uncovered the spatial organization of metazoan chromosomes into autonomously folded substructures, often termed topologically associated domains (TADs). There is a striking correlation between TAD organization and hallmarks of genome function, such as histone modifications or gene expression, and disruptions of specific TAD structures have been associated with pathological misexpression of underlying genes. However, complete disruption of TADs seems to have mild effects on the transcriptome, raising questions as to the importance of chromatin topology in regulating the expression of most genes. Furthermore, despite a growing number of genetic perturbation studies, it is still largely unclear how TAD-like domains are defined, maintained or potentially reorganized. This Perspectives article discusses the recent work exploring the complexity of the relationship between TADs and transcription, arguing that it is not satisfactorily explained by any 'rules' which have been previously described.
Mots clés
CTCF, Hi-C, Topologically associated domain (TAD), boundaries, loop extrusion
Référence
J. Mol. Biol.. 2019 Dec 18;: