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Updated: Jun 2, 2026
08:46
Implementing Patch Clamp and Live Fluorescence Microscopy to Monitor Functional Properties of Freshly Isolated PKD Epithelium
Published on: September 1, 2015
The exocyst protein Sec10 interacts with Polycystin-2 and knockdown causes PKD-phenotypes
Ben Fogelgren1, Shin-Yi Lin, Xiaofeng Zuo
1Department of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America.
Plos Genetics
|April 15, 2011
Summary
The exocyst complex is crucial for targeting polycystin-2 to primary cilia, essential for normal kidney function. This discovery links the exocyst to autosomal dominant polycystic kidney disease (ADPKD) pathogenesis.
Area of Science:
- Cell Biology
- Genetics
- Molecular Biology
Background:
- Autosomal dominant polycystic kidney disease (ADPKD) arises from mutations in PKD1/PKK2 genes, affecting polycystins in primary cilia.
- The precise mechanism of protein targeting to primary cilia remains incompletely understood.
Purpose of the Study:
- To investigate the role of the exocyst complex in polycystin trafficking and ADPKD.
- To establish a genetic and biochemical link between polycystins and the exocyst.
Main Methods:
- Knockdown of exocyst component Sec10 in cell culture and zebrafish models.
- Analysis of cellular phenotypes, including calcium signaling, proliferation, and MAPK activation.
- Biochemical assays to detect protein interactions and co-localization studies.
Main Results:
- Sec10 knockdown mimicked ADPKD cellular phenotypes and polycystin-2 knockdown phenotypes in zebrafish.
- Demonstrated a synergistic genetic interaction between sec10 and pkd2 in zebrafish.
- Confirmed biochemical interaction and co-localization of Sec10 with polycystin-2, IFT88, and IFT20 in primary cilia.
Conclusions:
- The exocyst complex is essential for the ciliary localization of polycystin-2.
- This mechanism is critical for polycystin-2 function and likely plays a role in ADPKD development.
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