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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
Annals of Neurology
|June 5, 2003
Summary
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.