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MEGDEL syndrome — Clinical Guidelines

Overview

MEGDEL syndrome is an autosomal recessive disorder characterized by 3-methylglutaconic aciduria, impaired oxidative phosphorylation, sensorineural deafness, encephalopathy, Leigh-like brain lesions, progressive spasticity, dystonia, and metabolic disturbances such as acidosis and lactic acidemia 1 2.

Diagnosis

Key Diagnostic Criteria:

- 3-methylglutaconic aciduria and 3-methylglutaric aciduria - Sensorineural deafness - Encephalopathy with progressive spasticity and dystonia - Brain imaging showing Leigh-like lesions - Metabolic acidosis, hyperammonemia, and lactic acidemia

Recommended Tests:

- Urinary organic acid analysis to detect 3-methylglutaconic aciduria - Audiometry for sensorineural hearing loss - MRI brain imaging for Leigh-like lesions - Blood gas analysis for metabolic acidosis - Plasma amino acid analysis

Management

First-Line Treatments:

- Supportive care including physical therapy for spasticity and dystonia - Seizure management with anticonvulsants (specific drugs not detailed)

Adjunctive Treatments:

- Nutritional support tailored to metabolic needs - Monitoring and management of metabolic acidosis and hyperammonemia

Special Populations

Pediatrics:

- Early recognition and management crucial due to multisystem involvement 1

Comorbidities:

- Infantile hepatopathy is a cardinal feature, requiring specific hepatic monitoring and management 2

Key Recommendations

Confirm diagnosis through urinary organic acid analysis and genetic testing for SERAC1 mutations (Evidence: Moderate) 1 2

Implement comprehensive supportive care addressing neurological, metabolic, and auditory impairments (Evidence: Expert opinion) 1

Regular monitoring of metabolic parameters including blood gases, amino acids, and liver function is essential (Evidence: Moderate) 2

References

1 Ünal Ö, Özgül RK, Yücel D, Yalnızoğlu D, Tokatlı A, Sivri HS et al.. Two Turkish siblings with MEGDEL syndrome due to novel SERAC1 gene mutation. The Turkish journal of pediatrics 2015. link 2 Sarig O, Goldsher D, Nousbeck J, Fuchs-Telem D, Cohen-Katsenelson K, Iancu TC et al.. Infantile mitochondrial hepatopathy is a cardinal feature of MEGDEL syndrome (3-methylglutaconic aciduria type IV with sensorineural deafness, encephalopathy and Leigh-like syndrome) caused by novel mutations in SERAC1. American journal of medical genetics. Part A 2013. link

MEGDEL syndrome