Laminopathy-causing lamin A mutations reconfigure lamina-associated domains and local spatial chromatin conformation

N Briand, P Collas - Nucleus, 2018 - Taylor & Francis
Nucleus, 2018Taylor & Francis
The nuclear lamina contributes to the regulation of gene expression and to chromatin
organization. Mutations in A-type nuclear lamins cause laminopathies, some of which are
associated with a loss of heterochromatin at the nuclear periphery. Until recently however,
little if any information has been provided on where and how lamin A interacts with the
genome and on how disease-causing lamin A mutations may rearrange genome
conformation. Here, we review aspects of nuclear lamin association with the genome. We …
Abstract
The nuclear lamina contributes to the regulation of gene expression and to chromatin organization. Mutations in A-type nuclear lamins cause laminopathies, some of which are associated with a loss of heterochromatin at the nuclear periphery. Until recently however, little if any information has been provided on where and how lamin A interacts with the genome and on how disease-causing lamin A mutations may rearrange genome conformation. Here, we review aspects of nuclear lamin association with the genome. We highlight recent evidence of reorganization of lamin A-chromatin interactions in cellular models of laminopathies, and implications on the 3-dimensional rearrangement of chromatin in these models, including patient cells. We discuss how a hot-spot lipodystrophic lamin A mutation alters chromatin conformation and epigenetic patterns at an anti-adipogenic locus, and conclude with remarks on links between lamin A, Polycomb and the pathophysiology of laminopathies. The recent findings presented here collectively argue towards a deregulation of large-scale and local spatial genome organization by a subset of lamin A mutations causing laminopathies.
Taylor & Francis Online