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Related Experiment Video

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Association Between Sleep Quality and Cognitive Symptoms in Patients with Major Depressive Disorder

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Published on: April 26, 2024

Association between a serotonin transporter length polymorphism and primary insomnia.

Michael Deuschle¹, Michael Schredl, Claudia Schilling

¹Central Institute of Mental Health, Department of Psychiatry and Psychotherapy, Mannheim, Germany. michael.deuschle@zi-mannheim.de

|March 27, 2010

Summary

The short allele of the serotonin transporter gene (5-HTTLPR) polymorphism is more common in primary insomnia patients, suggesting a genetic link to the sleep disorder.

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Area of Science:

Genetics
Sleep Medicine
Neuroscience

Background:

Primary insomnia is a common sleep disorder with complex pathophysiology.
The serotonin transporter gene (5-HTTLPR) plays a role in regulating serotonin levels, impacting mood and sleep.
Genetic variations in 5-HTTLPR have been linked to various psychiatric disorders.

Purpose of the Study:

To investigate the association between the 5-HTTLPR polymorphism and primary insomnia.
To test if the 44-base-pair insertion/deletion polymorphism in the 5' regulatory region of the serotonin transporter gene is linked to insomnia.

Main Methods:

An association study was conducted.
157 patients diagnosed with primary insomnia and 827 healthy controls were recruited.
Genotyping of the 5-HTTLPR polymorphism was performed.

Main Results:

The short (s-) allele of the 5-HTTLPR was found to be significantly more frequent in primary insomnia patients compared to healthy controls (47.1% vs. 39.9%).
An odds ratio of 1.34 indicated an increased likelihood of insomnia associated with the short allele.

Conclusions:

The 5-HTTLPR polymorphism, specifically the short allele, is associated with primary insomnia.
This finding provides insights into the biological underpinnings of primary insomnia.
The results suggest a potential genetic basis for the frequent co-occurrence of primary insomnia and other psychiatric conditions.