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Mitochondrial syndromes with leukoencephalopathies.

Lee-Jun C Wong¹

¹Department of Molecular and Human Genetics, Baylor College of Medicine, One Baylor Plaza, NAB2015, Houston, TX 77030, USA. ljwong@bcm.edu

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|March 17, 2012

Summary

Multisystem mitochondrial disorders commonly affect white matter due to genetic defects. Diagnosis involves evaluating patients with leukoencephalopathy for these conditions through molecular analysis.

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Area of Science:

Neuroscience
Genetics
Biochemistry

Background:

White matter involvement is a frequent characteristic of multisystem mitochondrial disorders.
These disorders stem from defects in mitochondrial DNA (mtDNA) or nuclear genes.
Classical syndromes include MELAS, Leigh's disease, and Kearns-Sayre's syndrome, often linked to respiratory chain deficiencies.

Purpose of the Study:

To highlight the significance of white matter involvement in multisystem mitochondrial disorders.
To review genetic causes affecting white matter integrity.
To emphasize the diagnostic approach for patients presenting with leukoencephalopathy and multisystem involvement.

Main Methods:

Review of literature on mitochondrial disorders and white matter involvement.
Analysis of genetic defects in mitochondrial and nuclear genomes.
Discussion of diagnostic strategies including biochemical, clinical, and imaging data.

Main Results:

Identified various genetic defects (mtDNA and nuclear) causing white matter abnormalities in mitochondrial disorders.
Highlighted specific conditions like MNGIE, NNH, Alpers syndrome, and LBSL associated with white matter pathology.
Emphasized that leukoencephalopathy with neurological and systemic symptoms necessitates a mitochondrial disorder evaluation.

Conclusions:

White matter involvement is a key indicator for multisystem mitochondrial disorders.
Molecular analysis of candidate genes is crucial for definitive diagnosis.
Early and accurate diagnosis aids in managing these complex genetic conditions.