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Molecular genetics of sudden cardiac death in small animals - a review
Changbaig Hyun1, Lucio J Filippich
1Victor Chang Cardiac Research Institute, 384 Victoria Street, Darlinghurst, NSW 2010, Australia.
Abstract:
Sudden cardiac death in small animals is uncommon but often occurs due to cardiac conduction defects or myocardial diseases. Primary cardiac conduction defects are mainly caused by mutations in genes involved in impulse conduction processes (e.g., gap-junction genes and transcription factors) or repolarisation processes (e.g., ion-channel genes), whereas primary cardiomyopathies are mainly caused by defective force generation or force transmission due to gene mutations in either sarcomeric or cytoskeleton proteins. Although over 50 genes have been identified in humans directly or indirectly related to sudden cardiac death, no genetic aetiologies have been identified in small animals. Sudden cardiac deaths have been also reported in German Shepherds and Boxers. A better understanding of molecular genetic aetiologies for sudden cardiac death will be required for future study toward unveiling aetiology in sudden cardiac death in small animals.
Insights
Sudden cardiac death in small animals, while rare, stems from genetic defects in heart function. Identifying these genetic causes in pets is crucial for future research and prevention strategies.
Area of Science:
- Veterinary Genetics
- Cardiology
- Molecular Biology
Background:
- Sudden cardiac death (SCD) in small animals is uncommon, primarily linked to cardiac conduction defects or myocardial diseases.
- Genetic mutations affecting impulse conduction (gap-junction, transcription factors, ion channels) or myocardial function (sarcomeric, cytoskeleton proteins) cause these conditions.
- Over 50 genes are linked to SCD in humans, but genetic causes remain unidentified in small animals, despite reported cases in breeds like German Shepherds and Boxers.
Purpose of the Study:
- To review the known genetic underpinnings of sudden cardiac death in mammals.
- To highlight the knowledge gap in identifying specific genetic aetiologies for sudden cardiac death in small animal populations.
- To emphasize the need for further research into the molecular genetics of sudden cardiac death in veterinary medicine.
Main Methods:
- Literature review of genetic factors associated with sudden cardiac death in humans and animals.
- Analysis of gene categories implicated in cardiac conduction and myocardial function.
- Synthesis of current understanding regarding genetic predispositions to cardiac events in canines.
Main Results:
- Identified gene categories involved in cardiac impulse conduction and force generation/transmission.
- Confirmed a significant lack of identified genetic aetiologies for sudden cardiac death specifically in small animal species.
- Noted breed predispositions in German Shepherds and Boxers, suggesting potential genetic links.
Conclusions:
- Understanding the molecular genetic basis of sudden cardiac death is essential for advancing veterinary cardiology.
- Further research is required to identify specific gene mutations responsible for sudden cardiac death in small animals.
- Establishing genetic links will pave the way for diagnostic tools and targeted interventions in affected breeds.
