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Myosins are a family of molecular motor proteins, first identified in the skeletal muscles, where they are responsible for muscle contraction. Along with their role in muscle contraction, these proteins also play a role in the intracellular transport of molecules and vesicles. There are twenty-four classes of myosins based on their domain sequence and organization. Of the twenty-four, six classes (Myosin I, Myosin II, Myosin V, Myosin VI, Myosin VII, and Myosin X)  have been well...
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Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a  complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
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De novo myogenesis, or the formation of muscle fibers, begins during the early embryonic stages. The skeletal muscle is formed from somites– blocks of embryonic cell layers. The somites are further divided into dermatomes, myotomes, sclerotomes, and syndetomes. Among these, the myotomes give rise to muscle fibers.
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Related Experiment Video

Updated: Jul 6, 2025

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Synaptopodin-2 Isoforms Have Specific Binding Partners and Display Distinct, Muscle Cell Type-Specific Expression

Keerthika Lohanadan1, Marvin Assent1, Anja Linnemann1

  • 1Institute for Cell Biology, University of Bonn, 53121 Bonn, Germany.

Cells
|January 11, 2024
PubMed
Summary

Synaptopodin-2 (SYNPO2) protein isoforms have distinct roles in muscle cells and cancer. This study identifies synemin as a binding partner, revealing new links in muscle structure and potential roles in disease.

Keywords:
alternative splicingdenervationnemaline myopathyneurogenic atrophyprotein isoformssmooth musclestriated musclesynaptopodin-2/SYNPO2/myopodinsyneminα-actinin

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Area of Science:

  • Molecular and Cellular Biology
  • Muscle Physiology
  • Cancer Biology

Background:

  • Synaptopodin-2 (SYNPO2) is a muscle-associated protein implicated in Z-disc maintenance and potentially cancer progression.
  • Alternative splicing generates multiple SYNPO2 isoforms with varying N- and C-termini, suggesting diverse functions.
  • Previous research indicated roles in striated and smooth muscle, but isoform-specific functions and interactions remained unclear.

Purpose of the Study:

  • To investigate the differential expression and function of SYNPO2 isoforms in various muscle types.
  • To identify novel binding partners of SYNPO2 and elucidate their interactions.
  • To explore the role of SYNPO2 in muscle pathology and cancer.

Main Methods:

  • Analysis of mRNA and protein expression of SYNPO2 isoforms in cardiac, skeletal, and smooth muscle cells.
  • Co-immunoprecipitation and colocalization studies to identify and validate binding partners.
  • Examination of SYNPO2 localization in pathological muscle samples.

Main Results:

  • Differential expression of SYNPO2 isoforms was observed across muscle cell types.
  • Synemin, an intermediate filament protein, was identified as a novel binding partner for specific SYNPO2 isoforms, colocalizing in cardiac and smooth muscle.
  • A C-terminal extension of SYNPO2 mediates interaction with α-actinin and localization to dense bodies in smooth muscle.

Conclusions:

  • SYNPO2 isoforms exhibit distinct expression patterns and functions in different muscle tissues.
  • SYNPO2 forms novel links between intermediate filaments and Z-discs/dense bodies, contributing to muscle structural integrity.
  • SYNPO2's presence in pathological muscle fibers suggests roles in neurogenic atrophy and nemaline myopathy, alongside its proposed role in cancer.