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C. elegans SMA-10 regulates BMP receptor trafficking.

Ryan J Gleason1, Mehul Vora1, Ying Li1

  • 1Waksman Institute, Department of Molecular Biology and Biochemistry, Cancer Institute of New Jersey, Rutgers University, Piscataway, New Jersey, United States of America.

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The leucine-rich and immunoglobulin-like domains (LRIG) protein SMA-10 regulates bone morphogenetic protein (BMP) signaling by controlling the endocytic trafficking of the SMA-6 receptor. Loss of SMA-10 causes BMP signaling defects due to aberrant receptor trafficking.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • Transforming growth factor-β (TGFβ) signaling is crucial for development and is mediated by type I and type II transmembrane receptors.
  • Endocytosis regulates the assembly of TGFβ signaling complexes.
  • The bone morphogenetic protein (BMP) pathway, a branch of TGFβ signaling, involves specific receptor trafficking mechanisms.

Purpose of the Study:

  • To investigate the role of SMA-10, a leucine-rich and immunoglobulin-like domains (LRIG) protein, in regulating BMP signaling.
  • To elucidate how SMA-10 influences the endocytic trafficking of the BMP type I receptor SMA-6.
  • To explore the evolutionary conservation of SMA-10's function in BMP signaling.

Main Methods:

  • Genetic screens in C. elegans to identify BMP signaling modifiers.
  • Analysis of endocytic trafficking pathways using various endosomal markers.
  • Comparative studies in Drosophila to assess the function of the SMA-10 homolog, lambik (lbk).
  • Biochemical assays to examine receptor ubiquitination.

Main Results:

  • Loss of sma-10 in C. elegans leads to aberrant endocytic trafficking of the SMA-6 receptor, causing its accumulation in endosomes and reduced BMP signaling.
  • SMA-10's role in trafficking is specific, affecting only a subset of receptors.
  • The Drosophila homolog of SMA-10, lambik (lbk), also negatively impacts BMP signaling, indicating conserved function.
  • Loss of sma-10 results in decreased ubiquitination of the SMA-6 receptor.

Conclusions:

  • SMA-10 is a positive regulator of BMP signaling, essential for proper endocytic trafficking of the SMA-6 receptor.
  • Aberrant SMA-6 trafficking due to sma-10 loss underlies reduced BMP signaling.
  • The function of SMA-10 in BMP pathway regulation is evolutionarily conserved from C. elegans to Drosophila.