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Title: A large genomic deletion leads to enhancer adoption by the lamin B1 gene: a second path to autosomal dominant adult-onset demyelinating leukodystrophy (ADLD)

Journal Article · · Human Molecular Genetics
DOI:https://doi.org/10.1093/hmg/ddv065· OSTI ID:1257371

Chromosomal rearrangements with duplication of the lamin B1 (LMNB1) gene underlie autosomal dominant adult-onset demyelinating leukodystrophy (ADLD), a rare neurological disorder in which overexpression of LMNB1 causes progressive central nervous system demyelination. However, we previously reported an ADLD family (ADLD-1-TO) without evidence of duplication or other mutation in LMNB1 despite linkage to the LMNB1 locus and lamin B1 overexpression. By custom array-CGH, we further investigated this family and report here that patients carry a large (~660 kb) heterozygous deletion that begins 66 kb upstream of the LMNB1 promoter. Lamin B1 overexpression was confirmed in further ADLD-1-TO tissues and in a postmortem brain sample, where lamin B1 was increased in the frontal lobe. Through parallel studies, we investigated both loss of genetic material and chromosomal rearrangement as possible causes of LMNB1 overexpression, and found that ADLD-1-TO plausibly results from an enhancer adoption mechanism. The deletion eliminates a genome topological domain boundary, allowing normally forbidden interactions between at least three forebrain-directed enhancers and the LMNB1 promoter, in line with the observed mainly cerebral localization of lamin B1 overexpression and myelin degeneration. Finally, this second route to LMNB1 overexpression and ADLD is a new example of the relevance of regulatory landscape modifications in determining Mendelian phenotypes.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1257371
Journal Information:
Human Molecular Genetics, Vol. 24, Issue 11; ISSN 0964-6906
Publisher:
Oxford University PressCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 88 works
Citation information provided by
Web of Science

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Cited By (31)

A novel 3q29 deletion associated with autism, intellectual disability, psychiatric disorders, and obesity
  • Biamino, Elisa; Di Gregorio, Eleonora; Belligni, Elga Fabia
  • American Journal of Medical Genetics Part B: Neuropsychiatric Genetics, Vol. 171, Issue 2 https://doi.org/10.1002/ajmg.b.32406
journal December 2015
Tissue Regeneration Enhancer Elements: A Way to Unlock Endogenous Healing Power: Tissue Regeneration Enhancer Elements journal November 2018
Dynamic Lamin B1-Gene Association During Oligodendrocyte Progenitor Differentiation journal February 2020
Modulation of tissue repair by regeneration enhancer elements journal April 2016
Phenotypic interpretation of complex chromosomal rearrangements informed by nucleotide-level resolution and structural organization of chromatin journal January 2018
Topologically associating domains are ancient features that coincide with Metazoan clusters of extreme noncoding conservation journal September 2017
The role of 3D genome organization in development and cell differentiation journal June 2019
Development and Optimization of a High-Content Analysis Platform to Identify Suppressors of Lamin B1 Overexpression as a Therapeutic Strategy for Autosomal Dominant Leukodystrophy journal April 2020
The segregation of different submicroscopic imbalances underlying the clinical variability associated with a familial karyotypically balanced translocation journal December 2015
A functional variant in the boundary of a topological association domain is associated with pancreatic cancer risk journal June 2019
Structural variation in the 3D genome journal April 2018
Allele-specific silencing as treatment for gene duplication disorders: proof-of-principle in autosomal dominant leukodystrophy journal May 2019
Looking beyond the genes: the role of non-coding variants in human disease journal June 2016
Glucose metabolism in the brain in LMNB1-related autosomal dominant leukodystrophy journal September 2018
TAD fusion score: discovery and ranking the contribution of deletions to genome structure journal March 2019
The unfolded protein response and its potential role in Huntington ́s disease elucidated by a systems biology approach journal January 2015
Minor Loops in Major Folds: Enhancer–Promoter Looping, Chromatin Restructuring, and Their Association with Transcriptional Regulation and Disease journal December 2015
Condensin Depletion Causes Genome Decompaction Without Altering the Level of Global Gene Expression in Saccharomyces cerevisiae journal July 2018
Demystifying the secret mission of enhancers: linking distal regulatory elements to target genes journal October 2015
Beyond the Exome: The Non-coding Genome and Enhancers in Neurodevelopmental Disorders and Malformations of Cortical Development journal July 2019
The unfolded protein response and its potential role in Huntington's disease elucidated by a systems biology approach journal January 2015
Lamin B1 levels modulate differentiation into neurons during embryonic corticogenesis journal July 2017
Lamin B1 protein is required for dendrite development in primary mouse cortical neurons journal January 2016
Chromatin organization modulates the origin of heritable structural variations in human genome journal February 2019
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LMNB1-Related Adult-Onset Autosomal Dominant Leukodystrophy Presenting as Movement Disorder: A Case Report and Review of the Literature journal October 2019

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