Dataset Information

Serotonin receptor 3A polymorphism c.-42C > T is associated with severe dyspepsia.

ABSTRACT:

Background

The association between anxiety and depression related traits and dyspepsia may reflect a common genetic predisposition. Furthermore, genetic factors may contribute to the risk of having increased visceral sensitivity, which has been implicated in dyspeptic symptom generation. Serotonin (5-HT) modulates visceral sensitivity by its action on 5-HT3 receptors. Interestingly, a functional polymorphism in HTR3A, encoding the 5-HT3 receptor A subunit, has been reported to be associated with depression and anxiety related traits. A functional polymorphism in the serotonin transporter (5-HTT), which terminates serotonergic signalling, was also found associated with these psychiatric comorbidities and increased visceral sensitivity in irritable bowel syndrome, which coexistence is associated with higher dyspeptic symptom severity. We investigated the association between these functional polymorphisms and dyspeptic symptom severity.

Methods

Data from 592 unrelated, Caucasian, primary care patients with dyspepsia participating in a randomised clinical trial comparing step-up and step-down antacid drug treatment (The DIAMOND trial) were analysed. Patients were genotyped for HTR3A c.-42C > T SNP and the 44 bp insertion/deletion polymorphism in the 5-HTT promoter (5-HTTLPR). Intensity of 8 dyspeptic symptoms at baseline was assessed using a validated questionnaire (0 = none; 6 = very severe). Sum score ?20 was defined severe dyspepsia.

Results

HTR3A c.-42T allele carriers were more prevalent in patients with severe dyspepsia (OR 1.50, 95% CI 1.06-2.20). This association appeared to be stronger in females (OR 2.05, 95% CI 1.25-3.39) and patients homozygous for the long (L) variant of the 5-HTTLPR genotype (OR 2.00, 95% CI 1.01-3.94). Females with 5-HTTLPR LL genotype showed the strongest association (OR = 3.50, 95% CI = 1.37-8.90).

Conclusions

The HTR3A c.-42T allele is associated with severe dyspeptic symptoms. The stronger association among patients carrying the 5-HTTLPR L allele suggests an additive effect of the two polymorphisms. These results support the hypothesis that diminished 5-HT3 mediated antinociception predisposes to increased visceral sensitivity of the gastrointestinal tract. Moreover, the HTR3A c.-42C > T and 5-HTTLPR polymorphisms likely represent predisposing genetic variants in common to psychiatric morbidity and dyspepsia.

SUBMITTER: Mujakovic S

PROVIDER: S-EPMC3213216 | biostudies-literature | 2011 Oct

REPOSITORIES: biostudies-literature

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Publications

Serotonin receptor 3A polymorphism c.-42C > T is associated with severe dyspepsia.

Mujakovic Suhreta S ter Linde José Jm JJ de Wit Niek J NJ van Marrewijk Corine J CJ Fransen Gerdine Aj GA Onland-Moret N Charlotte NC Laheij Robert Jf RJ Muris Jean Wm JW Grobbee Diederick E DE Samsom Melvin M Jansen Jan Bmj JB Knottnerus André A Numans Mattijs E ME

BMC medical genetics 20111020

<h4>Background</h4>The association between anxiety and depression related traits and dyspepsia may reflect a common genetic predisposition. Furthermore, genetic factors may contribute to the risk of having increased visceral sensitivity, which has been implicated in dyspeptic symptom generation. Serotonin (5-HT) modulates visceral sensitivity by its action on 5-HT3 receptors. Interestingly, a functional polymorphism in HTR3A, encoding the 5-HT3 receptor A subunit, has been reported to be associa ...[more]

PMID: 22014438

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Dataset Information

Serotonin receptor 3A polymorphism c.-42C > T is associated with severe dyspepsia.

Background

Methods

Results

Conclusions

Publications

Serotonin receptor 3A polymorphism c.-42C > T is associated with severe dyspepsia.

Similar Datasets

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