Mitochondrial disease in autism spectrum disorder patients: a cohort analysis

Jacqueline R Weissman, Richard I Kelley, Margaret L Bauman, Bruce H Cohen, Katherine F Murray, Rebecca L Mitchell, Rebecca L Kern, Marvin R Natowicz, Jacqueline R Weissman, Richard I Kelley, Margaret L Bauman, Bruce H Cohen, Katherine F Murray, Rebecca L Mitchell, Rebecca L Kern, Marvin R Natowicz

Abstract

Background: Previous reports indicate an association between autism spectrum disorders (ASD) and disorders of mitochondrial oxidative phosphorylation. One study suggested that children with both diagnoses are clinically indistinguishable from children with idiopathic autism. There are, however, no detailed analyses of the clinical and laboratory findings in a large cohort of these children. Therefore, we undertook a comprehensive review of patients with ASD and a mitochondrial disorder.

Methodology/principal findings: We reviewed medical records of 25 patients with a primary diagnosis of ASD by DSM-IV-TR criteria, later determined to have enzyme- or mutation-defined mitochondrial electron transport chain (ETC) dysfunction. Twenty-four of 25 patients had one or more major clinical abnormalities uncommon in idiopathic autism. Twenty-one patients had histories of significant non-neurological medical problems. Nineteen patients exhibited constitutional symptoms, especially excessive fatigability. Fifteen patients had abnormal neurological findings. Unusual developmental phenotypes included marked delay in early gross motor milestones (32%) and unusual patterns of regression (40%). Levels of blood lactate, plasma alanine, and serum ALT and/or AST were increased at least once in 76%, 36%, and 52% of patients, respectively. The most common ETC disorders were deficiencies of complex I (64%) and complex III (20%). Two patients had rare mtDNA mutations of likely pathogenicity.

Conclusions/significance: Although all patients' initial diagnosis was idiopathic autism, careful clinical and biochemical assessment identified clinical findings that differentiated them from children with idiopathic autism. These and prior data suggest a disturbance of mitochondrial energy production as an underlying pathophysiological mechanism in a subset of individuals with autism.

Conflict of interest statement

Competing Interests: Author BHC is compensated as a member of the Speakers Board and as a member of the Scientific Advisory Board of Transgenomic, Inc., Omaha.

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