genetic cardiomyopathy
Some heart-muscle diseases are written into a person's DNA before birth. Genetic cardiomyopathy refers to heart-muscle disease caused by inherited mutations in the genes that build or maintain the muscle — affecting, for example, the contractile machinery, the scaffolding that holds cells together, or the proteins that manage the cell's energy and electrical signals. Because the fault is in the genes, it can pass from parent to child.
Many of the named cardiomyopathies have strong genetic forms. Hypertrophic cardiomyopathy is most often caused by mutations in the contractile sarcomere; arrhythmogenic right ventricular cardiomyopathy by mutations in the cell-to-cell junctions; and a substantial share of dilated cardiomyopathy is inherited too. Inheritance is frequently dominant, meaning one altered copy of a gene can be enough, and severity can vary even within one family.
Recognising a genetic cause changes care for the whole family, not just the patient. It supports cascade screening — testing and following close relatives who may carry the same gene before symptoms appear — and increasingly guides risk assessment for sudden death. The honest caveat is that genetics is incomplete: not every case has an identifiable mutation, carrying a mutation does not guarantee disease (incomplete penetrance), and interpreting results well requires specialist genetic counselling.
After a young man dies suddenly and is found to carry a sarcomere mutation, his siblings undergo genetic testing and cardiac screening for the same inherited cardiomyopathy.
A confirmed familial mutation turns one diagnosis into a screening program for the whole family.
Cascade screening means testing and following at-risk relatives once a familial mutation is found.