A Gene Transfer Therapy Study to Evaluate the Safety of SRP-9004 (Patidistrogene Bexoparvovec) in Participants With Limb-Girdle Muscular Dystrophy, Type 2D (LGMD2D)

Key Inclusion Criteria: * Cohort 1A must be adult and wheelchair-dependent; Cohorts 1B and 2 will be participants of age 7 or older. * Confirmed alpha-sarcoglycan deficiency or identified sarcoglycan alpha (SGCA) deoxyribonucleic acid (DNA) mutation. * Participants enrolled in Cohorts 1B or 2 must be able to walk independently, but must exhibit signs of lower extremity weakness (that is, a Gowers' sign, use a handrail for climbing stairs) and walk ≤80% of predicted distance on the 6 minute walk test (6MWT) based on normative data. Key Exclusion Criteria: * Active viral infection based on clinical observations. * The presence of SGCA mutations without weakness or loss of function. * Symptoms or signs of cardiomyopathy. * Serological evidence of human immunodeficiency virus (HIV), Hepatitis B, or C infection. * Diagnosis of (or ongoing treatment for) an autoimmune disease. * Participants with AAVrh74 or AAV8 binding antibody titers ≥ 1:50 as determined by enzyme-linked immunosorbent assay (ELISA) immunoassay. Other inclusion/exclusion criteria apply.