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Attention-Deficit/Hyperactivity Disorder01:30

Attention-Deficit/Hyperactivity Disorder

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Functional Characterization of Na+/H+ Exchangers of Intracellular Compartments Using Proton-killing Selection to Express Them at the Plasma Membrane
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Exploring the genetic link between RLS and ADHD.

B G Schimmelmann1, S Friedel, T T Nguyen

  • 1Department of Child and Adolescent Psychiatry and Psychotherapy, University of Duisburg-Essen, LVR Klinikun Essen, Virchowstr. 174, 45147 Essen, Germany. bschimme@aol.com

Journal of Psychiatric Research
|February 19, 2009
PubMed
Summary
This summary is machine-generated.

Genetic variants linked to restless legs syndrome (RLS) were investigated for their association with attention deficit/hyperactivity disorder (ADHD). The study found no strong evidence that RLS risk alleles contribute to ADHD, suggesting distinct genetic underpinnings.

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Area of Science:

  • Neurogenetics
  • Developmental Neuroscience

Background:

  • Attention deficit/hyperactivity disorder (ADHD) and restless legs syndrome (RLS) share potential central nervous system (CNS) pathologies and high heritability.
  • Previous genome-wide association studies (GWA) identified specific genetic variants associated with RLS risk.

Purpose of the Study:

  • To investigate whether genetic variants previously associated with RLS are also associated with ADHD.
  • To explore the shared genetic etiology between ADHD and RLS.

Main Methods:

  • Genotyping of single nucleotide polymorphisms (SNPs) in MEIS1, BTBD9, and MAP2K5 genes in a German cohort of 224 families with ADHD.
  • Transmission disequilibrium testing (TDT) to assess preferential transmission of RLS-associated variants to ADHD-affected offspring.

Main Results:

  • No significant evidence for preferential transmission of hypothesized RLS risk variants to individuals with ADHD.
  • Nominal significant association found with a haplotype in the BTBD9 gene, but this did not survive correction for multiple testing.
  • Exploratory analyses suggested potential, but not robust, links, possibly due to ADHD genetic heterogeneity.

Conclusions:

  • RLS risk alleles may have a limited or no role in the genetic etiology of ADHD.
  • The genetic architecture of ADHD might be heterogeneous, with RLS variants potentially influencing specific ADHD subtypes.
  • Further investigation of genes like BTBD9, potentially involved in iron metabolism, is warranted for understanding ADHD pathophysiology.