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Dissecting Torsin/cofactor function at the nuclear envelope: a genetic study.

Ethan Laudermilch1, Pei-Ling Tsai1, Morven Graham2

  • 1Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, CT 06520.

Molecular Biology of the Cell
|November 1, 2016
PubMed
Summary
This summary is machine-generated.

Researchers deleted Torsin ATPases to study nuclear envelope (NE) blebbing. More deleted Torsin alleles correlated with increased NE blebs, revealing a link to nuclear pore complex homeostasis.

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Area of Science:

  • Cell Biology
  • Molecular Genetics
  • Structural Biology

Background:

  • The human genome encodes four Torsin ATPases, but their precise functions remain largely unknown.
  • Torsin ATPases are implicated in various cellular processes, yet their role in nuclear envelope dynamics is unclear.

Purpose of the Study:

  • To investigate the function of Torsin ATPases using CRISPR/Cas9 gene editing.
  • To correlate Torsin ATPase activity with nuclear envelope (NE) morphology, specifically NE blebbing.
  • To elucidate the role of Torsin ATPases and their cofactors (LAP1, LULL1) in NE homeostasis.

Main Methods:

  • CRISPR/Cas9 gene editing to generate individual and combinatorial deletions of Torsin ATPase genes.
  • Phenotypic analysis of nuclear envelope blebbing as a quantitative measure of Torsin function.
  • Electron microscopy tomography and immunogold labeling for structural and compositional analysis of NE structures.

Main Results:

  • A direct correlation was established between the number of inactivated Torsin alleles and the formation of omega-shaped NE blebs.
  • Functional redundancy was observed among Torsin ATPases and their cofactors LAP1 and LULL1.
  • Ubiquitin and nucleoporins were identified as key components within the omega-shaped bleb structures.

Conclusions:

  • The Torsin/cofactor system plays a crucial role in the biogenesis and homeostasis of the nuclear envelope and nuclear pore complex.
  • Torsin-deficient cell lines provide a robust model for dissecting Torsin ATPase functions.
  • Findings suggest a novel mechanism linking Torsin function to nuclear structural integrity.