Leiomodin-2 (Lmod2) is a striated muscle-specific actin-binding protein that plays a crucial role in the regulation of thin filament length and assembly in muscle cells. It is particularly important in cardiac and skeletal muscles. In the heart, Lmod2 is necessary for maintaining proper thin filament length, which is crucial for generating contractile force. Studies have shown that Lmod2 knockout in mice leads to dilated cardiomyopathy and rapid cardiac failure due to shorter and non-uniform thin filaments. Lmod2 is also essential for effective skeletal muscle contraction. Mutations or loss of Lmod2 can lead to significant impairments in muscle function. Mutations in the LMOD2 gene have been linked to severe neonatal and infantile dilated cardiomyopathy, a condition characterized by enlarged heart chambers and impaired contractility. Its observed molecular weight is 70-100 kDa.