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Genetics of sudden cardiac death caused by ventricular arrhythmias
Roos F Marsman1, Hanno L Tan1, Connie R Bezzina1
1AMC Heart Center, Department of Clinical and Experimental Cardiology, Room L2-108, Academic Medical Center, University of Amsterdam, Meibergdreef 9, 1105 AZ Amsterdam, Netherlands.
Insights
Sudden cardiac death (SCD) risk can be better understood by integrating genetic information. Research is exploring genetic modifiers and noncoding regions to identify new SCD-associated genes.
Area of Science:
- Cardiovascular genetics
- Genomics
- Molecular biology
Background:
- Sudden cardiac death (SCD) from ventricular tachyarrhythmia is a significant cause of mortality.
- Current clinical management relies on risk markers, but genetic insights can improve patient care.
- While gene variants explain some rare Mendelian SCD causes, disease variability suggests additional genetic modifiers.
Purpose of the Study:
- To explore the role of genetic factors in sudden cardiac death (SCD) risk.
- To investigate how genetic information can enhance clinical management of SCD.
- To identify novel genes and pathways influencing cardiac electrical function and SCD risk.
Main Methods:
- Utilizing next-generation DNA sequencing for large dataset analysis.
- Identifying genetic loci associated with electrocardiogram (ECG) indices as intermediate phenotypes.
- Investigating the role of noncoding regulatory regions in cardiac electrical function.
Main Results:
- Multiple genetic loci influencing ECG indices (intermediate phenotypes for tachyarrhythmia) have been identified.
- These loci offer potential pathways to new molecules affecting cardiac electrical function.
- Understanding noncoding genomic regions is crucial for identifying novel SCD-associated genes.
Conclusions:
- Integrating genetic information, including noncoding regions, is vital for improving sudden cardiac death (SCD) risk assessment.
- Further research into genetic modifiers and novel genes will advance our understanding of SCD.
- Genomic approaches hold promise for identifying new therapeutic targets for SCD.
Abstract:
Sudden cardiac death (SCD) resulting from ventricular tachyarrhythmia is a major contributor to mortality. Clinical management of SCD, currently based on clinical markers of SCD risk, can be improved by integrating genetic information. The identification of multiple disease-causing gene variants has already improved patient management and increased our understanding of the rare Mendelian diseases associated with SCD risk in the young, but marked variability in disease severity suggests that additional genetic modifiers exist. Next-generation DNA sequencing could be crucial to the discovery of SCD-associated genes, but large data sets can be difficult to interpret. SCD usually occurs in patients with an average age of 65 years who have complex cardiac disease stemming from multiple, common, acquired disorders. Heritable factors are largely unknown, but are likely to have a role in determining the risk of SCD in these patients. Numerous genetic loci have been identified that affect electrocardiogram indices, which are regarded as intermediate phenotypes for tachyarrhythmia. These loci could help to identify new molecules and pathways affecting cardiac electrical function. These loci are often located in intergenic regions, so our evolving understanding of the noncoding regulatory regions of the genome are likely to aid in the identification of novel genes that are important for cardiac electrical function and possibly SCD.
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