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Updated: Jan 10, 2026

Isolation and Kv Channel Recordings in Murine Atrial and Ventricular Cardiomyocytes
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Sudden Death-Associated KCNH2 Variants Have Opposing Effects on hERG1NP Function.

Francisco G Sanchez-Conde1, Matthew Goodrich1, Olivia Stack1

  • 1Department of Pharmacology, University of Michigan Medical School.

Biorxiv : the Preprint Server for Biology
|November 24, 2025
PubMed
Summary
This summary is machine-generated.

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Genetic variants in the hERG1 non-conducting subdomain (hERG1NP) can cause sudden death. This study reveals these variants lead to both loss-of-function and gain-of-function effects on hERG1NP activity.

Area of Science:

  • Cardiovascular Science
  • Molecular Biology
  • Genetics

Background:

  • The hERG1 non-conducting subdomain (hERG1NP) is crucial for regulating the full-length hERG1 channel in cardiomyocytes.
  • hERG1NP variants are implicated in sudden cardiac death, but their functional impact remains unclear.

Purpose of the Study:

  • To investigate the functional consequences of hERG1NP variants on hERG1NP activity and hERG1a channel function.
  • To determine how specific hERG1NP variants affect nuclear localization and ion channel modulation.

Main Methods:

  • HEK293 cells were used to assess hERG1NP intracellular localization and its effect on hERG1a current (IhERG).
  • Six hERG1NP variants were screened for alterations in nuclear transport and modulation of IhERG.

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Related Experiment Videos

Last Updated: Jan 10, 2026

Isolation and Kv Channel Recordings in Murine Atrial and Ventricular Cardiomyocytes
11:33

Isolation and Kv Channel Recordings in Murine Atrial and Ventricular Cardiomyocytes

Published on: March 12, 2013

13.7K
Recapitulation of an Ion Channel IV Curve Using Frequency Components
10:14

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Published on: February 8, 2011

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Voltage-Dependent Potassium Current Recording on H9c2 Cardiomyocytes via the Whole-Cell Patch-Clamp Technique
08:11

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Published on: November 11, 2022

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Main Results:

  • Wildtype hERG1NP suppressed both IhERG and hERG1a protein levels.
  • Two variants (R885C, R1047L) disrupted hERG1NP activity by impairing nuclear transport or abolishing suppression.
  • Two variants (G1036D, Q1068R) enhanced hERG1NP activity, affecting hERG1a activation kinetics.

Conclusions:

  • hERG1NP variants linked to sudden death can induce both loss-of-function and gain-of-function effects.
  • Understanding these variant-specific mechanisms is essential for elucidating the pathophysiology of sudden cardiac death.