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The intermediate filaments are an essential component of the cytoskeleton. Presently six types of intermediate filament have been identified. Type I and II are acidic and basic keratin proteins. Type III is of mesodermal origin and comprises four proteins: vimentin, desmin, glial fibrillary acidic protein (GFAP), and peripherin. Vimentin is commonly found in mesenchymal cells, desmin in muscle cells, GFAP in astrocytes, while peripherin is found in peripheral nervous system neurons (PNS). Type...
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Nuclear Lamins: Thin Filaments with Major Functions.

Rebecca de Leeuw1, Yosef Gruenbaum2, Ohad Medalia3

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Trends in Cell Biology
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The nuclear lamina, composed of nuclear lamins (intermediate filament proteins), forms a meshwork essential for cell structure and function. Mutations in lamin genes cause diseases called laminopathies and can lead to premature aging.

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cryo-electron tomographylamin-binding proteinslaminopathiesnuclear envelopenuclear lamina

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Area of Science:

  • Cell Biology
  • Biochemistry
  • Genetics

Background:

  • The nuclear lamina is a protein meshwork at the cell's nuclear periphery, primarily made of nuclear lamins (type V intermediate filament proteins).
  • Lamins are crucial for nuclear organization, mechanical stability, and gene regulation.
  • Mutations in lamin genes, particularly LMNA, lead to laminopathies, a group of diseases affecting muscles, metabolism, and neurons, and can cause accelerated aging.

Purpose of the Study:

  • To summarize the current understanding of nuclear lamina composition, function, and disease implications.
  • To highlight recent findings on the structural organization of lamin filaments.

Main Methods:

  • Literature review of recent studies on nuclear lamins and laminopathies.
  • Analysis of protein interactions and cellular roles of nuclear lamins.
  • Examination of the structural assembly of lamin filaments.

Main Results:

  • Nuclear lamins are type V intermediate filament proteins forming the nuclear lamina and nucleoplasmic meshwork.
  • Lamin mutations are linked to over 15 human diseases (laminopathies) and accelerated aging.
  • Nuclear proteins interact with lamins, influencing nuclear and cytoskeletal organization, gene regulation, and genome stability.
  • Recent research shows lamin filaments in somatic cells assemble as tetramers in cross-section.

Conclusions:

  • The nuclear lamina and its protein components, lamins, are vital for cellular integrity and function.
  • Dysfunctional lamins due to mutations result in significant human diseases and aging phenotypes.
  • Ongoing research continues to uncover the complex roles of lamins in cellular processes and disease pathogenesis.