Methionyl-tRNA Formyltransferase (MTFMT) Deficiency Mimicking Acquired Demyelinating Disease

Area of Science:

• Genetics
• Neuroscience
• Mitochondrial Biology

Background:

• Mutations in the mitochondrial methionyl-tRNA formyltransferase (MTFMT) gene are rare and typically linked to Leigh syndrome and oxidative phosphorylation deficiency.
• Clinical manifestations usually involve developmental delay, progressing to ataxia and spasticity.

Observation:

• A patient presented with symptoms mimicking acquired demyelinating disease.
• Brain MRI revealed extensive white matter, optic nerve, brainstem, and spinal cord involvement.
• Whole-exome sequencing identified a homozygous pathogenic mutation (c.626C>T) in the MTFMT gene.

Findings:

• The identified MTFMT mutation expands the known clinical spectrum of related disorders.
• A relapsing-remitting neurological phenotype is now associated with MTFMT gene mutations.
• Neuroimaging findings in this case differ from previously reported MTFMT-related conditions.

Implications:

• This discovery broadens the diagnostic possibilities for patients with unexplained neurological and demyelinating conditions.
• Understanding the expanded phenotype aids in more accurate diagnosis and genetic counseling for MTFMT-related disorders.
• Further research into MTFMT function may reveal novel therapeutic targets for mitochondrial diseases.