HSPB3 is a small heat shock protein functioning as an ATP-independent molecular chaperone with multiple roles in cellular homeostasis and muscle biology. Structurally, HSPB3 forms polydisperse oligomeric assemblies, predominantly trimeric species, with a characteristic short C-terminal extension that influences its quaternary structure 1. The protein exhibits target protein-dependent chaperone activity, preventing heat-induced aggregation of various substrates 1. Beyond general proteostasis, HSPB3 plays a specialized role in myogenesis by binding to the lamin B receptor (LBR) in the nucleoplasm, maintaining its dynamic state and promoting transcription of myogenic genes 2. HSPB3 is also implicated in actin polymerization inhibition, and mutations in its α-crystallin domain correlate with neuromuscular disease. Pathogenic HSPB3 mutations are associated with distal hereditary motor neuropathy and Charcot-Marie-Tooth disease type 2 (CMT2), with disease mechanisms involving impaired mitochondrial quality control and mitophagy dysfunction 3. Patient-derived HSPB3 mutations induce motor defects and reduced mitochondrial membrane potential, which can be rescued by PINK1 and Parkin activation 3. Clinically, HSPB3 variants represent important diagnostic candidates in exome sequencing studies of rare neurological disorders 4. The evolutionary conservation of HSPB3's α-crystallin domain reflects its functional importance, though it shows lower purifying selection than other disease-associated sHSPs, explaining its lower mutation incidence in inherited neuropathies 5.