The retromer complex regulates C. elegans development and mammalian ciliogenesis.

Area of Science:

• Cell Biology
• Developmental Biology
• Molecular Biology

Background:

• The retromer complex, composed of VPS26, VPS29, VPS35, and sorting nexins (SNXs), is vital for intracellular trafficking.
• Its role in organismal development and impact on primary ciliogenesis are largely unknown.
• Previous studies hinted at retromer's involvement in development, but direct links to ciliogenesis were unexplored.

Purpose of the Study:

• To investigate the role of the retromer complex in C. elegans development.
• To determine the retromer's function in mammalian primary ciliogenesis.
• To elucidate the molecular mechanism by which retromer influences ciliogenesis.

Main Methods:

• CRISPR/Cas9 gene editing in C. elegans to create vps-26 knockouts.
• Depletion of retromer subunits (VPS26, VPS35, VPS29, SNX1, SNX2, SNX5, SNX27) in mammalian cells.
• Immunoprecipitation assays to detect interactions between retromer and CP110.
• Immunofluorescence microscopy to assess primary cilium formation and VPS35 localization.

Main Results:

• VPS26 knockout worms exhibited developmental defects, including reduced brood size and impaired vulval development.
• Mammalian cells with depleted retromer subunits showed significantly decreased primary ciliogenesis.
• VPS35 localized to the primary cilium, and retromer components co-immunoprecipitated with CP110, a key regulator of ciliogenesis.
• Retromer was essential for the removal of CP110 from the mother centriole.

Conclusions:

• The retromer complex plays a critical role in C. elegans development.
• Retromer is essential for regulating primary ciliogenesis in mammalian cells.
• A novel function of retromer is identified in the removal of CP110 from the mother centriole, impacting ciliogenesis.