Multifocal cavitating leukodystrophy-A distinct image in mitochondrial LYRM7 mutations.

Area of Science:

• Neuroscience
• Genetics
• Biochemistry

Background:

• Leukodystrophies are a group of inherited white matter disorders.
• Mutations in mitochondrial genes can lead to complex neurological phenotypes.
• The LYR motif-containing protein 7 (LYRM7) is crucial for mitochondrial complex III assembly.

Observation:

• An adult woman presented with progressive spasticity and dysmetria, mimicking leukodystrophy.
• MRI revealed characteristic white matter changes with posterior predominance and small cavitations.
• MRS detected a lactate peak, suggesting mitochondrial dysfunction.

Findings:

• Clinical exome sequencing identified a pathogenic homozygous start-loss variation in the LYRM7 gene.
• This mutation affects an integral component of the mitochondrial respiratory chain complex III.
• The patient's adult-onset, indolent presentation is atypical compared to previously reported childhood-onset cases.

Implications:

• This case expands the known phenotypic spectrum of LYRM7 gene mutations.
• It underscores the importance of considering mitochondrial disorders in adult-onset leukoencephalopathies.
• Understanding LYRM7 function is critical for diagnosing and potentially treating related neurodegenerative diseases.