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A subtype of autosomal recessive limb-girdle muscular dystrophy characterized by childhood onset of progressive proximal weakness of the shoulder and pelvic girdle muscles, resulting in difficulty walking, scapular winging, calf hypertrophy and contractures of the Achilles tendon, which lead to a tiptoe gait pattern. Cardiac and respiratory involvement is rare.
Soluble ActRIIB-Fc fusion proteins sequester myostatin and activin A, promoting myofiber hypertrophy through enhanced mTOR-S6K1 signaling and satellite cell activation to compensate for progressive muscle weakness in SGCA deficiency
HDAC6 selective inhibitors like tubacin increase utrophin (UTRN) transcription through enhanced H3K27 acetylation at the UTRN promoter, providing functional compensation for dystrophin-sarcoglycan complex instability
C5 convertase inhibition prevents membrane attack complex (C5b-9) formation, reducing complement-mediated sarcolemmal damage in SGCA-deficient fibers where dystroglycan complex instability increases membrane vulnerability to complement activation
Curcumin activates TFEB nuclear translocation through AMPK-mTORC1 pathway inhibition, promoting autophagy-mediated clearance of misfolded sarcoglycan proteins and reducing ER stress in SGCA-deficient myofibers
Astragaloside IV and astragalus polysaccharides enhance laminin-α2 binding to α-dystroglycan through increased O-mannosyl glycosylation via POMGNT1/POMGNT2 upregulation, compensating for α-sarcoglycan deficiency by strengthening sarcolemmal integrity
Withanolide A from Withania somnifera activates Nrf2-Keap1 pathway, upregulating antioxidant genes (NQO1, GCLC, HO-1) and reducing oxidative damage in SGCA-deficient myofibers prone to calcium-mediated oxidative stress
Hochu-ekki-to components (ginsenosides, astragalosides) activate PGC-1α through AMPK phosphorylation, enhancing mitochondrial biogenesis via NRF1/TFAM upregulation to improve energy metabolism in sarcoglycan-deficient muscle fibers