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Mutations

Mutations

Alternative RNA Splicing

Alternative RNA Splicing

Alternative RNA splicing is the regulated splicing of exons and introns to produce different mature mRNAs from a single pre-mRNA. Unlike in constitutive splicing where a single gene produces a single type of mRNA, alternative splicing allows an organism to produce multiple proteins from a single gene and plays an important role in protein diversity.
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...

Translation

Translation

Lesson: Translation
Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
Translation Produces the Building Blocks of Life

Translation

Translation

Lesson: Translation
Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
Translation Produces the Building Blocks of Life

Pharmacogenomics: Identification of New Drug Targets

Pharmacogenomics: Identification of New Drug Targets

Advances in genomics have profoundly influenced drug discovery by increasing both the speed and accuracy of pharmaceutical development. Pharmacogenomics, which examines how genetic variation influences drug response, facilitates the identification of novel therapeutic targets and enables patient stratification for personalized treatment. These strategies contribute to improved drug efficacy, minimized adverse effects, and more efficient clinical trial design.Mapping genetic differences...

Pharmacogenetic Phenotypes: Alterations in Pharmacokinetics, Drug Targets and Biologic Milieu

Pharmacogenetic Phenotypes: Alterations in Pharmacokinetics, Drug Targets and Biologic Milieu

Genetic variations significantly influence drug response through pharmacokinetics, receptor interactions, and biologic milieu modifications. Pharmacokinetic alterations impact drug metabolism and clearance, affecting efficacy and toxicity. Variants in drug-metabolizing enzymes, such as CYP2C9 and CYP2C19, alter drug activation and elimination. For example, CYP2C9 loss-of-function variants require lower warfarin doses to prevent excessive bleeding, while CYP2C19 variants reduce clopidogrel...

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Related Experiment Video

Updated: May 10, 2026

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

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

Published on: January 16, 2019

Long QT syndrome: beyond the causal mutation.

Ahmad S Amin¹, Yigal M Pinto, Arthur A M Wilde

¹A. A. M. Wilde: Department of Cardiology, Academic Medical Center, Meibergdreef 9, 1105 AZ, Amsterdam, The Netherlands. a.a.wilde@amc.uva.nl.

The Journal of Physiology

|June 12, 2013

Summary

Congenital long QT syndrome (LQTS) arises from gene mutations affecting cardiac ion channels. Disease severity varies greatly among carriers, suggesting additional modifying factors influence clinical outcomes.

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Area of Science:

Cardiology
Genetics
Molecular Biology

Background:

Congenital long QT syndrome (LQTS) is an inherited cardiac disorder.
It results from mutations in genes encoding cardiac ion channels.
LQTS can lead to life-threatening arrhythmias and sudden cardiac death.

Purpose of the Study:

To review factors that modify clinical presentation in LQTS.
To understand the variability in disease severity among mutation carriers.
To identify potential demographic, environmental, and genetic modifiers of LQTS phenotype.

Main Methods:

Literature review of studies on congenital long QT syndrome.
Analysis of demographic, environmental, and genetic factors influencing LQTS.
Review of clinical outcome data in heterozygous mutation carriers.

Main Results:

Mutation carriers exhibit a wide spectrum of clinical severity.
Many carriers remain asymptomatic, while others experience severe arrhythmias.
Identical mutations can manifest differently even within the same family.

Conclusions:

Clinical outcome in LQTS is not solely determined by the primary mutation.
Demographic, environmental, and genetic factors likely play a significant role in modulating LQTS phenotype.
Further research is needed to elucidate these modifying factors for improved patient management.