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The Ras Gene02:38

The Ras Gene

The Ras-gene-encoded proteins are regulators of signaling pathways controlling cell proliferation, differentiation, or cell survival. The Ras-gene family in humans constitutes three primary members—the HRas, NRas, and KRas. These genes code for four functionally distinct yet closely related proteins—the HRas, NRas, KRas4A, and KRas4B. The involvement of mutant Ras genes in human cancer was first discovered in 1982 and is among the most common causes of human tumorigenesis.
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Related Experiment Video

Updated: May 17, 2026

Implementing Patch Clamp and Live Fluorescence Microscopy to Monitor Functional Properties of Freshly Isolated PKD Epithelium
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Regulation of the PKD2 channel function and associated disease phenotypes by RASSF4.

Rui Tian1,2,3, Wanyi Fang2, Wenbin Yuan1

  • 1National "111" Center for Cellular Regulation and Molecular Pharmaceutics, School of Life and Health Sciences, Hubei University of Technology, Wuhan, China.

Communications Biology
|May 15, 2026
PubMed
Summary

Researchers identified Ras association domain family member 4 (RASSF4) as a regulator of polycystic kidney disease 2 (PKD2) channel activity. RASSF4 enhances PKD2 function, suggesting the RASSF4/PKD2 complex as a therapeutic target for autosomal dominant polycystic kidney disease (ADPKD).

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Published on: March 5, 2019

Area of Science:

  • Nephrology
  • Molecular Biology
  • Genetics

Background:

  • Autosomal dominant polycystic kidney disease (ADPKD) is a common genetic disorder causing kidney cysts.
  • Current treatments for ADPKD are limited, necessitating research into polycystic kidney disease (PKD) protein regulation.
  • PKD proteins, including PKD2, are crucial for kidney function and cyst development.

Purpose of the Study:

  • To identify novel regulators of the PKD2 ion channel.
  • To investigate the functional interaction between RASSF4 and PKD2.
  • To explore the therapeutic potential of targeting the RASSF4/PKD2 complex in ADPKD.

Main Methods:

  • Biotin-based proximity labeling and mass spectrometry in HEK cells to identify interacting proteins.
  • Co-immunoprecipitation, bimolecular fluorescence complementation, and in vitro binding assays to validate PKD2-RASSF4 interaction.
  • Two-electrode voltage clamp electrophysiology in Xenopus oocytes and in vivo studies in zebrafish to assess functional impact.

Main Results:

  • Ras association domain family member 4 (RASSF4) was identified as a PKD2-interacting protein.
  • RASSF4 enhances PKD2 channel activity and alleviates Pkd2 knockdown-associated phenotypes in zebrafish.
  • RASSF4 promotes the intramolecular interaction of PKD2 and suppresses RAS/MAPK signaling.

Conclusions:

  • RASSF4 is a novel regulator of PKD2 channel function.
  • The RASSF4/PKD2 complex plays a significant role in modulating PKD2 activity and ADPKD pathogenesis.
  • Targeting the RASSF4/PKD2 interaction presents a potential therapeutic strategy for ADPKD.