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Mitochondrial dysfunction in autistic patients with 15q inverted duplication
Pauline A Filipek1, Jenifer Juranek, Moyra Smith
1Department of Pediatrics, College of Medicine, University of California, Irvine, CA, USA. filipek@uci.edu
Insights
This study presents two autistic children with chromosome 15q11-q13 duplication. Findings suggest genetic factors influencing mitochondrial function may contribute to autism spectrum disorder.
Area of Science:
- Genetics
- Neurodevelopmental Disorders
- Mitochondrial Biology
Background:
- Autism Spectrum Disorder (ASD) is a complex neurodevelopmental condition with diverse genetic underpinnings.
- Chromosome 15q11-q13 duplications are associated with various neurodevelopmental abnormalities.
- Mitochondrial dysfunction has been implicated in the pathophysiology of ASD.
Observation:
- Two children diagnosed with autism presented with a specific genetic abnormality: an inverted duplication of chromosome 15q11-q13.
- Clinical features included moderate motor delay, lethargy, severe hypotonia, and mild lactic acidosis.
- Electroencephalogram (EEG) and Magnetic Resonance Imaging (MRI) scans were within normal limits.
Findings:
- Muscle mitochondrial enzyme assays revealed significant mitochondrial hyperproliferation.
- A partial respiratory chain block was identified, most likely affecting Complex III.
- These mitochondrial alterations suggest a link between the critical genetic region and cellular energy pathways.
Implications:
- Candidate genes within the 15q11-q13 region may influence mitochondrial function, contributing to autism development.
- This research highlights the role of mitochondrial pathways in ASD pathogenesis.
- Further investigation into mitochondrial dysfunction in individuals with 15q11-q13 duplications could reveal novel therapeutic targets for autism.
Abstract:
Two autistic children with a chromosome 15q11-q13 inverted duplication are presented. Both had uneventful perinatal courses, normal electroencephalogram and magnetic resonance imaging scans, moderate motor delay, lethargy, severe hypotonia, and modest lactic acidosis. Both had muscle mitochondrial enzyme assays that showed a pronounced mitochondrial hyperproliferation and a partial respiratory chain block most parsimoniously placed at the level of complex III, suggesting candidate gene loci for autism within the critical region may affect pathways influencing mitochondrial function.