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Laminins are heterotrimeric proteins with high molecular mass found in the extracellular matrix. Each laminin molecule is composed of three chains, viz. alpha, beta, and gamma, coded by five, four, and three paralogous genes, respectively. Laminins are categories based on the compositions of the three chains.
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Systematic identification of pathological lamin A interactors.

Travis A Dittmer1, Nidhi Sahni, Nard Kubben

  • 1National Cancer Institute, National Institutes of Health, Bethesda, MD 20892 Center for Cancer Systems Biology and Department of Cancer Biology, Dana-Farber Cancer Institute, Boston, MA 02215 Department of Genetics, Harvard Medical School, Boston, MA 02215.

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Summary

Laminopathies, caused by LMNA gene mutations, affect nuclear structure. This study maps lamin A interactors, revealing disease-specific interactions and suggesting lost tissue interactions cause disease phenotypes.

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Area of Science:

  • Cell Biology
  • Genetics
  • Molecular Biology

Background:

  • Laminopathies are diverse diseases linked to mutations in the LMNA gene, encoding nuclear proteins lamin A and C.
  • The genotype-phenotype correlation and tissue specificity of laminopathies remain poorly understood.
  • Identifying lamin A-binding partners affected by disease mutations is crucial for understanding disease mechanisms.

Purpose of the Study:

  • To globally identify lamin A-binding partners whose interactions are altered by disease-relevant LMNA mutations.
  • To investigate the role of specific domains and post-translational modifications in lamin A interactions.
  • To elucidate the molecular basis for tissue-specific laminopathy phenotypes.

Main Methods:

  • Genome-wide ORFeome library screening to identify lamin A-binding proteins.
  • Testing identified interactors against 89 known LMNA disease mutations.
  • Mapping interaction sites on lamin A, including the IgG-like domain.
  • Analyzing mutations affecting specific residues and their impact on protein interactions.

Main Results:

  • Identified and validated 337 lamin A-binding proteins.
  • Discovered 50 disease-associated interactors for 89 LMNA mutations.
  • Progerin interaction is mediated by farnesylation; the IgG-like domain is an interaction hotspot.
  • Destabilizing mutations in the Ig-like domain globally affect interactions; disease-specific interactors were identified for mutations at a single residue.

Conclusions:

  • A systematic map of disease-relevant lamin A interactors has been generated.
  • Loss of tissue-specific lamin A interactions is proposed as a mechanism for tissue-specific laminopathies.
  • Understanding these interactions provides insights into disease pathogenesis and potential therapeutic targets.