Overview
Melkersson's syndrome, often discussed within the context of mitochondrial encephalomyopathy, lactic acidosis, and stroke-like episodes (MELAS), is a rare, maternally inherited disorder characterized by encephalopathy, lactic acidosis, and recurrent stroke-like episodes. It primarily results from mutations in mitochondrial DNA affecting genes crucial for oxidative phosphorylation. 12Diagnosis
Clinical Presentation: Encephalopathy, lactic acidosis, stroke-like episodes with neurological deficits (e.g., hemianopsia, aphasia).
Muscle Biopsy: Identification of ragged-red fibers (RRF) via Gomori Trichrome staining.
Genetic Testing: Sequencing of mitochondrial DNA to detect mutations, particularly in MT-TL1 (m.3243A>G), MT-TS2 (e.g., m.12244G>A), and MT-ND1 (e.g., m.3959G>A, m.3995A>G).
Imaging: MRI showing progressive spread of stroke-like lesions from temporal to parietal or occipital cortex.
EEG: Focal periodic epileptiform discharges during acute episodes.
Biochemical Analysis: Decreased activity of mitochondrial respiratory chain complexes, particularly complex I.
Histopathology: COX-negative fibers indicating mitochondrial dysfunction. 123Management
Supportive Care: Management of symptoms including anticonvulsants for seizures, physical therapy, and cognitive support.
Lactic Acidosis: Monitoring and treatment with bicarbonate or other supportive measures as indicated.
Dietary Management: Caloric restriction and avoidance of fasting to manage metabolic derangements.
Genetic Counseling: Essential for families due to maternal inheritance pattern.
Multidisciplinary Approach: Collaboration with neurologists, geneticists, and metabolic specialists.
No Specific Antiviral or Immune Modulators: Evidence for targeted pharmacological interventions beyond supportive care is limited. 12Special Populations
Pediatrics: Early onset and progressive neurological decline require close monitoring and multidisciplinary care 1.
Pregnancy: Limited data; management should focus on maternal and fetal well-being with close obstetric and metabolic surveillance 1.
Elderly: Increased susceptibility to complications; tailored supportive care addressing comorbidities is crucial 1.
Comorbidities: Management of concurrent conditions like epilepsy should be integrated into overall care plan 1.Key Recommendations
Genetic Testing for Diagnosis: Perform comprehensive mitochondrial DNA sequencing to identify specific mutations like m.3243A>G, m.12244G>A, m.3959G>A, and m.3995A>G (Evidence: Moderate) 12
MRI Monitoring for Lesion Progression: Regular MRI scans to track the spread of stroke-like lesions from temporal to other cortical regions (Evidence: Moderate) 3
Multidisciplinary Care Approach: Implement a comprehensive care plan involving neurology, genetics, and metabolic specialists (Evidence: Expert opinion) 1References
1 Zhuang X, Wang J, Wang J, Lin Y, Yan C, Ji K. A novel tRNASer(AGY) 12244G > a variant impairs mitochondrial function and presents with classical MELAS phenotype. Neurological sciences : official journal of the Italian Neurological Society and of the Italian Society of Clinical Neurophysiology 2026. link
2 Lin J, Zhao CB, Lu JH, Wang HJ, Zhu WH, Xi JY et al.. Novel mutations m.3959G>A and m.3995A>G in mitochondrial gene MT-ND1 associated with MELAS. Mitochondrial DNA 2014. link
3 Iizuka T, Sakai F, Kan S, Suzuki N. Slowly progressive spread of the stroke-like lesions in MELAS. Neurology 2003. link