Related Experiment Video

Updated: Mar 12, 2026

Determining the Likelihood of Variant Pathogenicity Using Amino Acid-level Signal-to-Noise Analysis of Genetic Variation
07:15

Determining the Likelihood of Variant Pathogenicity Using Amino Acid-level Signal-to-Noise Analysis of Genetic Variation

Published on: January 16, 2019

11.5K

Molecular Pathophysiology of Congenital Long QT Syndrome

M S Bohnen1, G Peng1, S H Robey1

  • 1Department of Pharmacology, Columbia University Medical Center, New York, New York; and The New York Stem Cell Foundation Research Institute, New York, New York.

Physiological Reviews
|November 4, 2016
PubMed

Insights

Congenital Long QT Syndrome (LQTS) involves cardiac ion channel dysfunction, particularly IKs, IKr, and INa currents. Studying LQTS mutations advances understanding of ion channel function and guides precision medicine for arrhythmias.

Area of Science:

  • Cardiac Electrophysiology
  • Molecular Cardiology
  • Ion Channel Physiology

Background:

  • Cardiac action potentials are generated by ion channels, crucial for heart muscle contraction.
  • Mutations in cardiac ion channels can lead to arrhythmias, like congenital Long QT Syndrome (LQTS).
  • Understanding LQTS pathogenesis is key to managing cardiac electrical disorders.

Purpose of the Study:

  • To review the molecular determinants, pathogenesis, and pharmacology of congenital Long QT Syndrome.
  • To examine dysfunction mechanisms in critical cardiac currents (IKs, IKr, INa) associated with LQTS.
  • To highlight advancements in ion channel research driven by LQTS studies.

Main Methods:

  • Review of existing literature on congenital Long QT Syndrome.
  • Analysis of molecular mechanisms underlying dysfunction of key cardiac ion currents.
  • Examination of structure-function relationships and pharmacological responses related to LQTS mutations.

Main Results:

  • Congenital LQTS is primarily linked to dysfunction in slow delayed rectifier (IKs), rapid delayed rectifier (IKr), and voltage-dependent sodium (INa) currents.
  • Mutations causing LQTS provide insights into ion channel structure, function, and physiology.
  • Research has improved understanding of pharmacological agents for treating LQTS.

Conclusions:

  • Study of LQTS mutations significantly enhances knowledge of ion channel behavior and cardiac electrophysiology.
  • Genotype-driven management is improving patient care, making precision medicine a reality for LQTS.
  • Continued research into LQTS offers benefits for understanding and treating cardiac arrhythmias.

More Related Videos

Electrocardiogram Recordings in Anesthetized Mice using Lead II04:16

Electrocardiogram Recordings in Anesthetized Mice using Lead II

Published on: June 20, 2020

14.5K
Isolation and Kv Channel Recordings in Murine Atrial and Ventricular Cardiomyocytes11:33

Isolation and Kv Channel Recordings in Murine Atrial and Ventricular Cardiomyocytes

Published on: March 12, 2013

13.8K

Related Concept Videos

Mechanism of Cardiac Arrhythmias01:28

Mechanism of Cardiac Arrhythmias

Arrhythmias are irregular heart rhythms occurring when the heart's electrical impulses become abnormal. These disturbances can lead to various symptoms, depending on their severity and the underlying cause. Some common factors contributing to arrhythmias include hypoxia, ischemia, electrolyte imbalances, excessive catecholamine exposure, drug toxicity, and muscle overstretching. Arrhythmias can be classified into two main types based on the rate and site of origin of abnormal heart rhythms.
2.5K
Cystic Fibrosis: Pathogenesis01:23

Cystic Fibrosis: Pathogenesis

Cystic fibrosis (CF), an autosomal recessive disorder, significantly affects the function of exocrine glands. This genetically inherited disease is characterized by the production of thick and sticky mucus, which can severely affect various organs and systems in the body.
CF is primarily caused by a genetic mutation in a chromosome 7 gene coding for the cystic fibrosis transmembrane conductance regulator (CFTR) protein. The most common gene mutation leading to CF is the ΔF508 mutation,...
994
Pharmacodynamic Models: Linear Concentration–Effect Model01:15

Pharmacodynamic Models: Linear Concentration–Effect Model

The linear concentration–effect model, underpinned by the principle that pharmacological effect (E) is directly proportional to plasma drug concentration (C), emerges as a pivotal simplification of the Emax model for conditions where C is significantly less than EC50. This model portrays a linear trajectory of the concentration–effect relationship when drug levels are markedly below the EC50 threshold.Despite its inherent assumption of continuous effect augmentation with increasing...
51
ATP Synthase: Mechanism01:48

ATP Synthase: Mechanism

In animals, the mitochondrial F1F0 ATP synthase is the key protein that synthesizes ATP molecules through a complex catalytic mechanism. While the nuclear genome encodes the majority of ATP synthase subunits, the mitochondrial genome encodes some of the enzyme's most critical components. The formation of this multi-subunit enzyme is a complex multi-step process regulated at the level of transcription, translation, and assembly. Defects in one or more of these steps can result in decreased...
18.2K
Inborn Errors of Metabolism01:20

Inborn Errors of Metabolism

Phenylketonuria (PKU) is a protein metabolism disorder characterized by high blood levels of the amino acid phenylalanine. This results from a mutation in the gene responsible for phenylalanine hydroxylase, an enzyme that converts phenylalanine into tyrosine. When this enzyme is deficient, phenylalanine builds up in the blood, leading to symptoms such as vomiting, rashes, seizures, growth deficiency, and severe mental retardation. An early diagnosis and a diet restricting phenylalanine intake...
980
Incomplete Dominance01:43

Incomplete Dominance

Gregor Mendel's work (1822 - 1884) was primarily focused on pea plants. Through his initial experiments, he determined that every gene in a diploid cell has two variants called alleles inherited from each parent. He suggested that amongst these two alleles, one allele is dominant in character and the other recessive. The combination of alleles determines the phenotype of a gene in an organism.
31.9K