Next-generation sequencing identified a novel DYSF variant in a patient with limb-girdle muscular dystrophy type 2B: A case report

Abstract

Rationale:Limb-girdle muscular dystrophy (LGMD) is a genetic disease, which is characterized by muscle atrophy and weakness mainly involving proximal muscles. Accurate diagnosis of LGMD patient is very important for the appropriate management and long-term prognosis.Patient concerns:An 18-year-old woman presented with progressive weakness of limbs, persistent elevated serum creatine kinase, myogenic damages in electromyography, and dysferlin protein deficiency in muscle biopsy. Further next-generation sequencing (NGS) revealed a compound heterozygous variant in dysferlin gene (DYSF), including a novel frameshift variant of c.4010delT.Diagnosis:The patient was diagnosed with LGMD2B clinically and genetically.Interventions:Oral levocarnitine and coenzyme Q10 were prescribed to the patient.Outcomes:After symptomatic treatments for 1 week, the patient's symptoms were not improved.Lessons:NGS might be a helpful tool for the diagnosis of LGMD. A novel variant of c.4010delT in DYSF was identified in this case, which broadens the genetic spectrum of LGMD2B.