DelK32-lamin A/C has abnormal location and induces incomplete tissue maturation and severe metabolic defects leading to premature death
0301 basic medicine
[SDV.IMM] Life Sciences [q-bio]/Immunology
Mice
03 medical and health sciences
Metabolic Diseases
Adipocytes
Animals
Myocytes, Cardiac
Gene Knock-In Techniques
Muscle, Skeletal
Growth Disorders
Cell Nucleus
Adipogenesis
Nuclear Lamina
Lamin Type B
Mortality, Premature
Heart
Organ Size
Embryo, Mammalian
Lamin Type A
3. Good health
Animals, Newborn
Liver
[SDV.IMM]Life Sciences [q-bio]/Immunology
Mutant Proteins
DOI:
10.1093/hmg/ddr534
Publication Date:
2011-11-17T07:18:09Z
AUTHORS (15)
ABSTRACT
The LMNA gene encodes lamin A/C intermediate filaments that polymerize beneath the nuclear membrane, and are also found in the nucleoplasm in an uncharacterized assembly state. They are thought to have structural functions and regulatory roles in signaling pathways via interaction with transcription factors. Mutations in LMNA have been involved in numerous inherited human diseases, including severe congenital muscular dystrophy (L-CMD). We created the Lmna(ΔK32) knock-in mouse harboring a L-CMD mutation. Lmna(ΔK32/ΔK32) mice exhibited striated muscle maturation delay and metabolic defects, including reduced adipose tissue and hypoglycemia leading to premature death. The level of mutant proteins was markedly lower in Lmna(ΔK32/ΔK32), and while wild-type lamin A/C proteins were progressively relocated from nucleoplasmic foci to the nuclear rim during embryonic development, mutant proteins were maintained in nucleoplasmic foci. In the liver and during adipocyte differentiation, expression of ΔK32-lamin A/C altered sterol regulatory element binding protein 1 (SREBP-1) transcriptional activities. Taken together, our results suggest that lamin A/C relocation at the nuclear lamina seems important for tissue maturation potentially by releasing its inhibitory function on transcriptional factors, including but not restricted to SREBP-1. And importantly, L-CMD patients should be investigated for putative metabolic disorders.
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