LMOD2 (leiomodin 2) is an actin-binding protein essential for cardiac muscle function that mediates nucleation and polymerization of actin filaments, particularly regulating thin filament elongation at pointed ends 12. In the heart, LMOD2 is required for normal sarcomere organization and promotes elongation of cardiac thin filaments to reach mature length 34. LMOD2 accomplishes this through direct interaction with α-tropomyosin at its N-terminal region (residues 7-41 of LMOD2 binding to the first 21 residues of tropomyosin), facilitating proper thin filament assembly 5. Biallelic loss-of-function variants in LMOD2 cause neonatal or infantile dilated cardiomyopathy (DCM) characterized by severe cardiac dilation, impaired contractility, abnormally short thin filaments, and dysregulated calcium handling 673. These mutations result in absent or severely reduced LMOD2 protein expression 7. LMOD2 also plays tissue-specific roles in skeletal muscle contraction independent of thin filament length regulation 8. Disease pathogenesis involves dysregulation of serum response factor (SRF)-dependent signaling pathways, offering potential therapeutic targets 6. LMOD2-related cardiomyopathy represents a rare but severe autosomal recessive inherited disease requiring genetic screening in infants with early-onset cardiomyopathy.