Molecular diagnosis of dystrophinopathies using a multi-technique analysis algorithm

Area of Science:

• Genetics
• Molecular Biology
• Neuromuscular Disorders

Background:

• Dystrophinopathies, including Duchenne muscular dystrophy (DMD), are X-linked recessive neuromuscular diseases.
• Mutations in the dystrophin gene are the underlying cause of these debilitating conditions.
• Accurate genetic diagnosis is crucial for patient management and family planning.

Observation:

• Multiplex PCR, MLPA, and STR analysis were employed to investigate 17 individuals from two families with a history of DMD.
• The study aimed to detect dystrophin gene mutations, assess carrier status in women, and perform prenatal diagnosis.
• Analysis revealed two single-exon out-of-frame deletions in affected patients.

Findings:

• The applied methodology successfully characterized disease-causing mutations in DMD patients.
• Nine of thirteen women and one fetus were excluded from being carriers.
• Three recombination events indicated potential germline mosaicism in both families.

Implications:

• The methodology is effective for mutation characterization and carrier status assessment in DMD families.
• These findings support precise genetic counseling for individuals at risk of dystrophinopathies.
• The study contributes to understanding the genetic landscape of DMD in the Argentine population.