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Biallelic Mutations in MTPAP Associated with a Lethal Encephalopathy.

Lien Van Eyck1, Francesco Bruni2,3, Anne Ronan4

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Mutations in the MTPAP gene cause a severe, early-onset mitochondrial disease leading to perinatal encephalopathy and early death. This research identifies new MTPAP variants and their impact on mitochondrial gene expression.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Neuroscience

Background:

  • Mitochondrial poly(A) polymerase (MTPAP) is crucial for regulating mitochondrial gene expression via mRNA polyadenylation.
  • Previous studies identified MTPAP mutations in Old Order Amish individuals with spastic ataxia and optic atrophy.

Observation:

  • This study investigated three patients from two families with a severe perinatal encephalopathy.
  • Patients presented with stereotyped neuroimaging findings and infantile mortality.

Findings:

  • Whole-exome sequencing identified compound heterozygous and homozygous MTPAP variants in affected individuals.
  • Fibroblast analysis revealed truncated mitochondrial poly(A) tails and altered mitochondrial protein expression in patients.

Implications:

  • Mutations in MTPAP are implicated as a cause of autosomal recessive perinatal encephalopathy.
  • These findings highlight MTPAP's critical role in human development and mitochondrial function.