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Novel mutations in LMNA A/C gene and associated phenotypes
Roberta Petillo1, Paola D'Ambrosio1, Annalaura Torella2
1Cardiomyology and Medical Genetics, Department of Experimental Medicine;
Summary
Four new lamin A/C gene (LMNA) mutations were identified in patients with laminopathies, including muscular dystrophy and heart conditions. These novel LMNA variants expand the known spectrum of lamin A/C-related diseases.
Area of Science:
- Genetics
- Molecular Biology
- Cardiology
Background:
- Mutations in the lamin A/C gene (LMNA) are linked to a spectrum of diseases affecting multiple organs.
- LMNA mutations are increasingly recognized in dilated cardiomyopathy (DCM) and arrhythmogenic right ventricular cardiomyopathy (ARVC).
Observation:
- This study identified four novel LMNA mutations (3 missense, 1 deletion) in four unrelated patients.
- Patients presented with diverse phenotypes, including congenital muscular dystrophy, limb-girdle muscular dystrophy (LGMD), and cardiac involvement.
- One patient with congenital muscular dystrophy experienced heart block and tachycardia; two others with LGMD developed conduction defects requiring pacemakers.
Findings:
- The identified variants were absent in 300 control subjects, suggesting pathogenicity.
- One patient with a missense mutation (c.1339G>C) died from heart failure; another (c.265C>T) died from a thromboembolic event.
- A classical LGMD phenotype without cardiac issues was observed in a patient with the c.1579C>T mutation, who died from respiratory insufficiency.
Implications:
- These findings expand the genotypic and phenotypic spectrum of LMNA-related disorders.
- Early identification and characterization of novel LMNA mutations are crucial for understanding disease mechanisms.
- This research highlights the critical role of LMNA in both muscle and cardiac function.
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