Transcriptional factors in calcium mishandling and atrial fibrillation development

Area of Science:

• Cardiology
• Genetics
• Molecular Biology

Background:

• Cardiac arrhythmias, particularly atrial fibrillation (AF), are a major cause of mortality worldwide.
• Genetic factors significantly contribute to AF heritability, with identified loci including transcription factors, microRNAs, and long noncoding RNAs.
• Recent research links genetic alterations to AF pathogenesis through disruption of intracellular calcium handling.

Purpose of the Study:

• To review the intricate network of transcription factors involved in cardiac function.
• To elucidate the mechanisms by which genetic factors, particularly transcription factors, disrupt calcium handling in cardiomyocytes.
• To summarize the role of transcription factors in the genetic basis of atrial fibrillation.

Main Methods:

• Literature review of genetic studies and molecular mechanisms.
• Analysis of research on transcription factors and their targets in cardiac cells.
• Synthesis of findings related to calcium handling disruptions and AF.

Main Results:

• Genetic alterations in transcription factors can lead to AF by impairing cardiomyocyte calcium regulation.
• Loss of specific developmental transcription factors in adult cardiomyocytes affects key calcium handling proteins (e.g., SR calcium ATPase, sodium calcium exchanger).
• These disruptions result in action potential abnormalities and triggered activity, promoting AF.

Conclusions:

• Transcription factors play a critical role in maintaining normal cardiac conduction and calcium homeostasis.
• Dysregulation of transcription factors is a significant contributor to the genetic predisposition of atrial fibrillation.
• Targeting transcription factor-mediated pathways offers potential therapeutic strategies for AF.