Key result
Human A-band TTN truncating variants drive spontaneous, age-dependent dilated cardiomyopathy in zebrafish models.
Why the study?
Truncating variants in the TTN gene are the most common genetic cause of DCM, but exactly how they promote cardiomyocyte dysfunction is not known.
Zebrafish models offer critical insights into the pathogenesis and potential gene-environment modifiers of TTNtv-related dilated cardiomyopathy, overcoming limitations of rodent models.
Zebrafish TTNtv models may accelerate DCM therapy screening; leaves open clinical translation pending human validation.
Dilated cardiomyopathy (DCM) is a common heart muscle disorder characterized by ventricular dilation and contractile dysfunction that is associated with significant morbidity and mortality. New insights into disease mechanisms and strategies for treatment and prevention are urgently needed. Truncating variants in the TTN gene, which encodes the giant sarcomeric protein titin (TTNtv), are the most common genetic cause of DCM, but exactly how TTNtv promote cardiomyocyte dysfunction is not known. Although rodent models have been widely used to investigate titin biology, they have had limited utility for TTNtv-related DCM. In recent years, zebrafish (Danio rerio) have emerged as a powerful alternative model system for studying titin function in the healthy and diseased heart. Optically transparent embryonic zebrafish models have demonstrated key roles of titin in sarcomere assembly and cardiac development. The increasing availability of sophisticated imaging tools for assessment of heart function in adult zebrafish has revolutionized the field and opened new opportunities for modelling human genetic disorders. Genetically modified zebrafish that carry a human A-band TTNtv have now been generated and shown to spontaneously develop DCM with age. This zebrafish model will be a valuable resource for elucidating the phenotype modifying effects of genetic and environmental factors, and for exploring new drug therapies.
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Santiago et al. (2021) conducted a review in TTNtv-Related Dilated Cardiomyopathy. Zebrafish Models was evaluated. Zebrafish carrying human A-band TTN truncating variants spontaneously develop dilated cardiomyopathy with age, establishing them as a powerful model for exploring disease mechanisms and therapies.
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