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Obsessive-Compulsive Disorder01:28

Obsessive-Compulsive Disorder

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Obsessive-compulsive disorder (OCD) is a mental health condition characterized by recurrent obsessions, compulsions, or both, which consume significant time and interfere with daily functioning. Obsessions involve persistent, intrusive, and unwanted thoughts, images, or urges that evoke anxiety. Common examples include irrational fears of contamination or harm. Compulsions are repetitive behaviors or mental acts performed to reduce the anxiety caused by obsessions. For instance, individuals...
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Human genetics provides a profound framework for understanding the interplay between genetic predispositions and human psychology. At the heart of this discipline lies the study of how genes influence physical traits, behaviors, and susceptibility to diseases. Each person carries a unique genetic code that subtly or significantly shapes their psychological and behavioral landscape.
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Dependent personality disorder and obsessive-compulsive personality disorder are two separate psychological conditions that influence behavior, relationships, and overall life functioning. Though both involve maladaptive behaviors, their core characteristics and motivations differ significantly.
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When more than one gene is responsible for a given phenotype, the trait is considered polygenic. Human height is a polygenic trait. Studies have uncovered hundreds of loci that influence height, and there are believed to be many more. Due to the high number of genes involved, as well as environmental and nutritional factors, height varies significantly within a given population. The distribution of height forms a bell-shaped curve, with relatively few individuals in the population at the...
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Methylome-Wide Association Study of Obsessive-Compulsive Disorder.

Kira D Höffler1, Anne-Kristin Stavrum2, Matthew W Halvorsen3

  • 1Department for Clinical Medicine, University of Bergen, Bergen, Norway; Bergen Center for Brain Plasticity, Haukeland University Hospital, Bergen, Norway; Dr. Einar Martens Research Group for Biological Psychiatry, Department of Medical Genetics, Haukeland University Hospital, Bergen, Norway; Department of Psychiatry, McLean Hospital, Harvard Medical School, Belmont, Massachusetts.

Biological Psychiatry
|April 9, 2026
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Summary
This summary is machine-generated.

This study reveals DNA methylation differences in adults with obsessive-compulsive disorder (OCD). These epigenetic changes, particularly DNA methylation, may offer insights into the genetic and environmental factors contributing to OCD.

Keywords:
DNA methylationEWASEpigeneticsMWASOCDSex differences

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Area of Science:

  • Psychiatric Genetics
  • Epigenetics
  • Neuroscience

Background:

  • Obsessive-compulsive disorder (OCD) is a complex psychiatric condition with known genetic and environmental influences.
  • Epigenetic mechanisms, like DNA methylation, are increasingly recognized as potential mediators of these influences.
  • Understanding these molecular differences is crucial for advancing OCD research.

Purpose of the Study:

  • To conduct the largest methylome-wide association study (MWAS) for OCD to date.
  • To identify DNA methylation differences associated with OCD in adults.
  • To explore sex-specific epigenetic variations and their genetic underpinnings in OCD.

Main Methods:

  • Analyzed saliva DNA from 414 adults with OCD and 384 controls using the Illumina EPICv2 array.
  • Identified differentially methylated positions (DMPs) and regions (DMRs).
  • Performed sex-stratified analyses, methylation quantitative trait loci (mQTL) mapping, and cell-type composition assessments.

Main Results:

  • Identified 35 DMPs and 17 DMRs linked to genes in neurotransmission, neurodevelopment, and gene regulation.
  • Discovered sex-specific methylation signals, indicating biological differences between males and females with OCD.
  • Found that genetic variation influences most associated loci and that some saliva methylation findings may reflect brain biology, with potential immune system involvement.

Conclusions:

  • Epigenetic, genetic, and sex-specific data integration is vital for understanding OCD.
  • DNA methylation patterns hold promise for developing precision medicine approaches for OCD treatment.