[Serotonin transporter gene polymorphism in irritable bowel syndrome]

Area of Science:

• Genetics
• Gastroenterology
• Molecular Biology

Context:

• Irritable Bowel Syndrome (IBS) is a common functional gastrointestinal disorder.
• The serotonin transporter (SERT) gene plays a crucial role in regulating serotonin levels, impacting gut motility and sensation.
• Previous research suggests a potential link between SERT gene polymorphisms and IBS susceptibility.

Purpose:

• To investigate the association between specific polymorphisms in the SERT gene (VNTRs and 5-HTTLPR) and the risk of developing Irritable Bowel Syndrome (IBS).
• To determine if these genetic variations correlate with different IBS subtypes (constipation-predominant, diarrhea-predominant, and alternating).

Summary:

• A study involving 81 IBS patients and 48 healthy subjects analyzed SERT gene VNTRs and 5-HTTLPR polymorphisms using polymerase chain reaction.
• Results indicated a higher frequency of the STin2.12/10 genotype and a lower frequency of the STin2.12/12 genotype in IBS patients compared to healthy controls.
• The L/L genotype of 5-HTTLPR was more prevalent in constipation-predominant IBS (C-IBS), while the L/S genotype was associated with diarrhea-predominant (D-IBS) and alternating (A-IBS) subtypes. A significant association was found between the 12/12-L/L genotype and C-IBS.

Impact:

• Findings suggest that specific SERT gene genotypes, such as STin2.12/10, may be correlated with IBS development.
• The identified genotype associations provide potential genetic markers for predicting IBS subtypes and associated risks.
• This research contributes to understanding the genetic underpinnings of IBS, potentially paving the way for personalized treatment strategies.