Poor Myocardial Compaction in a Patient with Recessive MYL2 Myopathy

Area of Science:

• Genetics and Molecular Biology
• Cardiology
• Neurology

Background:

• Recessive mutations in the Myosin regulatory light chain 2 (MYL2) gene are linked to infantile-onset myopathy.
• This condition is often associated with fatal myocardial disease, presenting with variable macromorphology.

Observation:

• The study reports the first Japanese family diagnosed with recessive MYL2 myopathy.
• Affected siblings exhibited characteristic clinical features of the disease.

Findings:

• Autopsy findings of the proband were consistent with noncompaction cardiomyopathy.
• The rapid progression of this recessive MYL2 cardiomyopathy underscores the importance of the MYL2 protein's c-terminal tails.

Implications:

• The c-terminal tails of MYL2 are crucial for maintaining normal cardiac morphology and function.
• Understanding these mutations provides insights into genetic cardiomyopathies and potential therapeutic targets.