Case#: 19-year-old boy with coarctation of the aorta who complained of mild exertional dyspnea.

DiseaseAssertion: dilated cardiomyopathy (DCMP). LV systolic dysfunction.

FamilyInfo: The family history was positive to sudden death (his cousin died, aged 3 months) and to DCMP and heart transplant (HT): a maternal aunt and her son who then died at 42 and 24 years old. Cascade family screening revealed a TNNT2 variant in the mother (II.1) and his cousin (IV.3).

ParentalTesting: The 19 year old brother's was tested and carried the TNNT2 variant. She was also affected by DCM. The father’s testing status was not reported.

CasePresentingHPOs: HP:0001680, HP:0002875, HP:0025169, HP:4000141

CaseHPOFreeText: surgically repaired coarctation of the aorta who complained of mild exertional dyspnea repaired at birth (NYHA class II–III). Cardiac MRI showed a moderately dilated, hypokinetic LV with an ejection fraction of 45%; echocardiography showed an ejection fraction around 42%.

CaseNotHPOs: not reported

CaseNotHPOFreeText: Nothing was found that was correlated.

CasePreviousTesting: genetic investigations through next generation sequencing (NGS) with a panel of 325 genes, known to be associated with cardiomyopathies

Genotyping Method: targeted next generation sequencing

FunctionalAnalysis: not reported

Variant: c.518G>A (p. Arg173Gln)

ClinVar: 43649

CAID: CA004727

gnomAD: not reported

AdditionalInfo: not reported