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Updated: Jan 31, 2026

Overexpressing Long Noncoding RNAs Using Gene-activating CRISPR

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Published on: March 1, 2019

Propagation Failure by TRPM4 Overexpression.

Namit Gaur¹, Thomas Hof², Michel Haissaguerre³

¹University Bordeaux, IMB UMR 5251, Talence, France; IHU Liryc, Electrophysiology and Heart Modeling Institute, Fondation Bordeaux Université, Pessac-Bordeaux, France.

Biophysical Journal

|January 2, 2019

Summary

Transient receptor potential melastatin member 4 (TRPM4) channels, when overexpressed, can cause cardiac arrhythmias. Heterogeneous TRPM4 expression in Purkinje fibers is linked to clinical type II heart block.

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Area of Science:

Cardiovascular Physiology
Computational Biology
Ion Channel Function

Background:

Transient receptor potential melastatin member 4 (TRPM4) channels are implicated in inherited cardiac arrhythmias.
TRPM4 channels are nonselective monovalent cationic channels present in the human atria and cardiac conduction system.

Purpose of the Study:

To mathematically model TRPM4 channel function within a Purkinje cell model.
To investigate the electrophysiological effects of TRPM4 channel overexpression and heterogeneous expression in cardiac Purkinje fibers.

Main Methods:

Integrated a mathematical formulation of TRPM4 current into the Pan-Rudy Purkinje cell model.
Constructed an equivalent current for TRPM4 based on its dynamics, replacing existing currents to maintain action potential fidelity.
Simulated single-cell and tissue-level (homogeneous and heterogeneous) electrophysiological behaviors.

Main Results:

Increased TRPM4 expression (>2-fold) induced early afterdepolarizations in single Purkinje cells.
Complete conduction block occurred in homogeneous tissue with >2-fold TRPM4 expression.
Intermittent heart block was observed only with heterogeneous TRPM4 expression distribution.

Conclusions:

TRPM4 channels may contribute to the sodium background current (I_Nab) in Purkinje fibers.
Heterogeneous TRPM4 expression in the His/Purkinje system is a potential mechanism for clinical type II heart block.