TNNT1 encodes troponin T1, a slow skeletal muscle-specific isoform that serves as the tropomyosin-binding subunit of the troponin complex, which confers calcium-sensitivity to striated muscle actomyosin ATPase activity 1. The protein is essential for slow-twitch muscle fiber contraction and sarcomere organization, playing a central role in calcium regulation of actin thin filament function 1. TNNT1 expression is regulated by the mTOR signaling pathway and can be upregulated by L-arginine supplementation, promoting slow-twitch muscle fiber formation 2. Mutations in TNNT1 cause nemaline myopathy, a congenital myopathy characterized by muscle weakness and distinctive rod-like inclusions in muscle fibers 34. The gene shows variable clinical presentations ranging from severe infantile forms to childhood-onset and autosomal dominant variants. Beyond skeletal muscle, TNNT1 has been identified in specialized epithelial cells in bladder tissue, potentially involved in bladder emptying function 5. Recent studies also suggest TNNT1 may serve as a prognostic biomarker in gastrointestinal cancers, where its overexpression correlates with poor outcomes 6. The protein undergoes alternative splicing and post-translational modifications that provide functional diversity during muscle development and adaptation 1.