Glycogen Debrancher Enzyme Deficiency Myopathy

Area of Science:

• Biochemistry
• Genetics
• Neurology

Background:

• Glycogen storage disease type III (GSD III) is an inherited metabolic disorder.
• It results from deficient activity of the glycogen debranching enzyme.
• GSD III typically impacts the liver, heart, and skeletal muscles.

Purpose of the Study:

• To report an extremely rare case of GSD III presenting solely as skeletal muscle myopathy in an adult.
• To detail the clinical presentation, pathological findings, and genetic basis of this unusual GSD III manifestation.

Main Methods:

• Clinical case reporting.
• Review of patient's clinical features.
• Pathological examination of muscle tissue.
• Genetic analysis to identify mutations.

Main Results:

• The patient presented with myopathy as the primary symptom.
• Pathological findings confirmed muscle involvement consistent with GSD III.
• Genetic analysis identified specific mutations responsible for the enzyme deficiency.

Conclusions:

• Pure skeletal muscle involvement in adult-onset GSD III is exceptionally rare.
• This case underscores the importance of considering GSD III in adult myopathy diagnoses.
• Comprehensive clinical, pathological, and genetic evaluation is crucial for accurate diagnosis and understanding of GSD III.