Mitochondria and Peroxisome Crosstalk in Peroxisome Biogenesis Disorder 8A Caused by a Rare Variant in PEX16 Gene

Area of Science:

• Genetics
• Biochemistry
• Neurology

Background:

• Peroxisome biogenesis disorder 8A is a rare autosomal recessive condition.
• It is caused by mutations in the PEX16 gene.
• Mitochondrial dysfunction is a critical cellular process.

Purpose of the Study:

• To report the clinical, biochemical, and molecular characteristics of a patient with PEX16 mutation.
• To investigate the association between peroxisome biogenesis disorder 8A and mitochondrial dysfunction.
• To confirm the diagnosis using whole genome sequencing.

Main Methods:

• Clinical examination and biochemical assays (plasma very long-chain fatty acids).
• Skeletal muscle biopsy to assess mitochondrial morphology and respiratory chain enzyme activity.
• Whole genome sequencing for molecular confirmation.

Main Results:

• A newborn presented with microcephaly, encephalopathy, hypotonia, failure to thrive, hepatomegaly, and retinal abnormalities.
• Elevated plasma very long-chain fatty acids were detected.
• Muscle biopsy showed mitochondrial depletion and deficiencies in respiratory chain complexes I-IV.

Conclusions:

• The study confirms peroxisome biogenesis disorder 8A in a patient with a novel PEX16 mutation (c.526C>T, p.(Arg176*)).
• This is the first reported case associating this specific PEX16 mutation with significant mitochondrial dysfunction.
• Further research is required to understand the crosstalk between mitochondria and peroxisomes in this disorder.