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Developmental regression and mitochondrial function in children with autism.

Kanwaljit Singh1, Indrapal N Singh2,3, Eileen Diggins1

  • 1Department of Pediatrics, University of Massachusetts Medical School, Worcester, Massachusetts, United States.

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|April 29, 2020
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This summary is machine-generated.

Developmental regression (DR) in Autism Spectrum Disorder (ASD) may stem from unique mitochondrial dysfunction. This study found distinct respiratory abnormalities in children with ASD and DR, suggesting mitochondria as a therapeutic target.

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Area of Science:

  • Neuroscience
  • Metabolic Disorders
  • Genetics

Background:

  • Developmental regression (DR) affects approximately one-third of children with Autism Spectrum Disorder (ASD).
  • Mitochondrial dysfunction is increasingly implicated in ASD, but its specific role in DR remains understudied.
  • Understanding the link between mitochondrial function and DR is crucial for targeted interventions.

Purpose of the Study:

  • To investigate mitochondrial respiration, mtDNA damage, and copy number in children with ASD, with and without DR, compared to controls.
  • To explore the relationship between mitochondrial parameters and ASD severity, including behavioral measures.
  • To identify potential metabolic endophenotypes associated with DR in ASD.

Main Methods:

  • Cross-sectional study involving 32 children aged 2-8 years with ASD (11 with DR, 12 without DR) and 9 non-ASD controls.
  • Assessed mitochondrial respiration (oxygen consumption rates, coupling efficiency) and mtDNA (ND1, ND4, CYTB) copy number.
  • Correlated mitochondrial findings with standardized measures of ASD severity and behavioral symptoms.

Main Results:

  • Children with ASD showed reduced ND1, ND4, and CYTB copy numbers compared to controls.
  • ASD children with DR exhibited higher maximal oxygen consumption, respiratory capacity, and reserve capacity than those without DR.
  • Mitochondrial function correlated with behavioral symptoms, with higher ND1 copy number linked to better behavior.

Conclusions:

  • Individuals with ASD and DR may possess a distinct metabolic endophenotype characterized by vulnerable mitochondrial respiratory function.
  • Mitochondrial abnormalities could predispose individuals to decompensation under stress, leading to DR.
  • Mitochondria represent a potential therapeutic target for ASD, and early identification of mitochondrial vulnerability may aid in DR prevention.