NDLI: Defects of Lipid Synthesis Are Linked to the Age-Dependent Demyelination Caused by Lamin B1 Overexpression

Content Provider	PubMed Central
Author	Rolyan, Harshvardhan Tyurina, Yulia Y. Hernandez, Marylens Amoscato, Andrew A. Sparvero, Louis J. Nmezi, Bruce C. Lu, Yue Estécio, Marcos R. H. Lin, Kevin Chen, Junda He, Rong-rong Gong, Pin Rigatti, Lora H. Dupree, Jeffrey Bayır, Hülya Kagan, Valerian E. Casaccia, Patrizia Padiath, Quasar S.
Copyright Year	2015
Abstract	Lamin B1 is a component of the nuclear lamina and plays a critical role in maintaining nuclear architecture, regulating gene expression and modulating chromatin positioning. We have previously shown that LMNB1 gene duplications cause autosomal dominant leukodystrophy (ADLD), a fatal adult onset demyelinating disease. The mechanisms by which increased LMNB1 levels cause ADLD are unclear. To address this, we used a transgenic mouse model where Lamin B1 overexpression is targeted to oligodendrocytes. These mice showed severe vacuolar degeneration of the spinal cord white matter together with marked astrogliosis, microglial infiltration, and secondary axonal damage. Oligodendrocytes in the transgenic mice revealed alterations in histone modifications favoring a transcriptionally repressed state. Chromatin changes were accompanied by reduced expression of genes involved in lipid synthesis pathways, many of which are known to play important roles in myelin regulation and are preferentially expressed in oligodendrocytes. Decreased lipogenic gene expression resulted in a significant reduction in multiple classes of lipids involved in myelin formation. Many of these gene expression changes and lipid alterations were observed even before the onset of the phenotype, suggesting a causal role. Our findings establish, for the first time, a link between LMNB1 and lipid synthesis in oligodendrocytes, and provide a mechanistic framework to explain the age dependence and white matter involvement of the disease phenotype. These results have implications for disease pathogenesis and may also shed light on the regulation of lipid synthesis pathways in myelin maintenance and turnover.
Related Links	http://dx.doi.org/10.1523/JNEUROSCI.1668-15.2015
Starting Page	12002
File Format	PDF
ISSN	15292401
e-ISSN	15292401
Journal	The Journal of Neuroscience
Issue Number	34
Volume Number	35
Language	English
Publisher	Society for Neuroscience
Publisher Date	2015-08-26
Access Restriction	Open
Rights Holder	Society for Neuroscience
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Neuroscience

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