has material basis in germline mutation in TPM3 congenital nervous system disorder neuromuscular disease caused by qualitative or quantitative defects of tropomyosin congenital myopathy TPM3-related myopathy TPM3-related myopathy TPM3 myopathy autosomal dominant TPM3-related myopathy GARD:0026050 congenital myopathy related to TPM3 The most penetrant phenotype among all of the TPM3-related myopathy disease entities is muscular weakness. While nemaline myopathy is the most common presentation, several other myopathies have been reported in association with TPM3 mutations. The absence of clearly defined and/or distinct differences in molecular mechanism, coupled with noted phenotypic variability (both intra- and inter-familial) for individual variants, indicates that these entities are part of the same clinical spectrum. MONDO:0100108 TPM3-related myopathy is a disorder of the musculoskeletal system that covers a wide spectrum of phenotypes and is caused by pathogenic variants in the skeletal muscle γ-Tropomyosin gene. These variants lead to a variety of overlapping adult onset and congenital myopathies characterized by muscle weakness, hypotonia, motor delay, myopathic facies, scoliosis, and sometimes respiratory involvement. Histologic findings on skeletal muscle biopsy are variable with nemaline and intranuclear bodies, cap-like lesions, fiber-type disproportion, and dystrophic features even in patients with the same mutation. hereditary neurological disease