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Related Experiment Video

Updated: Jan 9, 2026

Measuring Single-Cell Mitochondrial DNA Copy Number and Heteroplasmy Using Digital Droplet Polymerase Chain Reaction
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The Role of Mitochondrial DNA Copy Number in Neurodevelopmental Disorders: A Bidirectional Two-Sample Mendelian

Xinhui Qiu1,2, Huilu Song1,2, Chenyang Wu3,4

  • 1The Second Clinical Medical College, Cheeloo College of Medicine, Shandong University, Jinan, Shandong, 250033, People's Republic of China.

Psychology Research and Behavior Management
|December 1, 2025
PubMed
Summary

This study found a genetic link between mitochondrial DNA copy number and autism spectrum disorder (ASD). No significant connection was found for attention-deficit/hyperactivity disorder (ADHD) or Tourette's syndrome (TS).

Keywords:
Tourette syndromeattention-deficit/hyperactivity disorderautism spectrum disordermendelian randomizationmitochondrial DNA copy numberneurodevelopmental disorders

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Genotyping Single Nucleotide Polymorphisms in the Mitochondrial Genome by Pyrosequencing
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Area of Science:

  • Genetics
  • Neuroscience
  • Mitochondrial Biology

Background:

  • Impaired mitochondrial bioenergetics are potentially linked to neurodevelopmental disorders (NDDs) like autism spectrum disorder (ASD), attention-deficit/hyperactivity disorder (ADHD), and Tourette's syndrome (TS).
  • The exact causal relationship between mitochondrial function and NDDs remains unclear.
  • Mitochondrial DNA (mtDNA) copy quantity serves as a key indicator of mitochondrial dysfunction.

Purpose of the Study:

  • To investigate the potential causal relationship between mtDNA copy quantity and NDDs.
  • To explore the genetic links between mitochondrial health and neurodevelopmental conditions.
  • To determine if mtDNA copy number influences the risk of developing ASD, ADHD, or TS.

Main Methods:

  • Utilized bidirectional two-sample Mendelian randomization (MR) analysis.
  • Employed data from the Psychiatric Genomics Consortium (PGC) and IEU OpenGWAS Project.
  • Performed sensitivity analyses including IVW, weighted median, MR-Egger, and MR-PRESSO for robust results.

Main Results:

  • A significant genetic causal relationship was identified between mtDNA copy number and ASD (OR=0.78, P=0.0077).
  • Confirmatory GWAS analysis reinforced the association with ASD (OR=0.80, P=0.0047).
  • No significant associations were found between mtDNA copy number and ADHD or TS.

Conclusions:

  • Established a significant genetic causal link between mtDNA copy number and ASD.
  • Found no evidence of a causal relationship between mtDNA copy number and ADHD or TS.
  • Further research is warranted to fully elucidate these genetic causal pathways.