Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 105, Issue 1, Pages 180-185Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0708974105
Keywords
filament assembly; laminopathic diseases; nuclear envelope
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Lamins are nuclear intermediate filament proteins and the major building blocks of the nuclear lamina. Besides providing nuclear shape and mechanical stability, lamins are required for chromatin organization, transcription regulation, DNA replication, nuclear assembly, nuclear positioning, and apoptosis. Mutations in human lamins cause many different heritable diseases, affecting various tissues and causing early aging. Although many of these mutations result in nuclear deformation, their effects on lamin filament assembly are unknown. Caenorhabditis elegans has a single evolutionarily conserved lamin protein, which can form stable 10-nm-thick filaments in vitro. To gain insight into the molecular basis of lamin filament assembly and the effects of laminopathic mutations on this process, we investigated mutations in conserved residues of the rod and tail domains that are known to cause various laminopathies in human. We show that 8 of 14 mutant lamins present WT-like assembly into filaments or paracrystals, whereas 6 mutants show assembly defects. Correspondingly, expressing these mutants in transgenic animals shows abnormal distribution of Ce-lamin, abnormal nuclear shape or change in lamin mobility. These findings help in understanding the role of individual residues and domains in laminopathy pathology and, eventually, promote the development of therapeutic interventions.
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