Genetic Influences on Anxiety Disorders

Anxiety disorders represent a group of common psychiatric conditions characterised by excessive fear and worry. Twin and family studies have consistently demonstrated moderate to high heritability estimates, indicating that genetic variation contributes substantially to individual susceptibility. Early research focused on candidate genes involved in monoaminergic neurotransmission, such as the serotonin transporter (SLC6A4), catechol-O-methyltransferase (COMT) and glutamate decarboxylase (GAD1). More recent genome-wide association studies have begun to reveal a polygenic architecture, in which numerous common variants confer small increments of risk. Epigenetic mechanisms, including DNA methylation and histone modification, shape gene expression in response to environmental stimuli and may mediate gene-environment interactions contributing to disorder onset and chronicity. Emerging evidence also implicates non-coding RNAs, especially microRNAs, in fine-tuning synaptic and stress-responsive pathways. Together, these advances highlight a multifaceted genetic landscape where rare and common variants, epigenetic regulation and regulatory RNAs converge on neural circuits governing fear learning, stress reactivity and emotional regulation. Translating these insights into clinical practice promises improved risk prediction, stratified interventions and the identification of novel therapeutic targets.

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Genetic Influences on Anxiety Disorders publication trend

The graph below shows the total number of articles in genetic influences on anxiety disorders across all publications each year (not limited to Nature Index journals).

Technical terms

Heritability: Proportion of trait variance in a population attributable to genetic factors.
Polymorphism: A common variation in DNA sequence at a specific locus.
Genome-wide association study: Unbiased scan of the genome to identify variants linked to a trait.
Epigenetics: Modifications that alter gene expression without changing the underlying DNA sequence.
MicroRNA: Small non-coding RNA molecules that regulate gene translation post-transcriptionally.

References

1. Neurochemical and genetic factors in panic disorder: a systematic review. Translational Psychiatry (2024).
2. Serotonin transporter polymorphisms and panic disorder. Genome Medicine (2010).
3. The COMTval158met polymorphism is associated with symptom relief during exposure-based cognitive-behavioral treatment in panic disorder. BMC Psychiatry (2010).
4. Gender Differences in Associations of Glutamate Decarboxylase 1 Gene (GAD1) Variants with Panic Disorder. PLOS ONE (2012).
5. A functional genetic variation of SLC6A2 repressor hsa-miR-579-3p upregulates sympathetic noradrenergic processes of fear and anxiety. Translational Psychiatry (2018).
6. Panic disorders: The role of genetics and epigenetics. Global Medical Genetics (2018).