Journal
NUCLEUS
Volume 2, Issue 3, Pages 195-207Publisher
TAYLOR & FRANCIS INC
DOI: 10.4161/nucl.2.3.15731
Keywords
laminopathies; lamin A; LMNA; knock-out mouse; cardiac hypertrophy; muscular dystrophy; differentiation
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Funding
- Intramural Research Program of the National Institutes of Health (NIH), NCI, Center for Cancer Research
- Dutch Heart Foundation
- ZonMW
- EU-KP7 grant 'Inheritance'
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A-type lamins are a major component of the nuclear lamina. Mutations in the LMNA gene, which encodes the A-type lamins A and C, cause a set of phenotypically diverse diseases collectively called laminopathies. While adult LMNA null mice show various symptoms typically associated with laminopathies, the effect of loss of lamin A/C on early postnatal development is poorly understood. Here we developed a novel LMNA null mouse (LMNA(GT-/-)) based on genetrap technology and analyzed its early post-natal development. We detect LMNA transcripts in heart, the outflow tract, dorsal aorta, liver and somites during early embryonic development. Loss of A-type lamins results in severe growth retardation and developmental defects of the heart, including impaired myocyte hypertrophy, skeletal muscle hypotrophy, decreased amounts of subcutaneous adipose tissue and impaired ex vivo adipogenic differentiation. These defects cause death at 2 to 3 weeks post partum associated with muscle weakness and metabolic complications, but without the occurrence of dilated cardiomyopathy or an obvious progeroid phenotype. Our results indicate that defective early postnatal development critically contributes to the disease phenotypes in adult laminopathies.
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