Serotonin transporter polymorphisms affect human blood glucose control

Area of Science:

• Nutritional Science
• Genetics
• Metabolic Health

Background:

• Nutritional interventions can impact metabolic markers like fasting blood glucose (FBG).
• Genetic variations, such as serotonin transporter-linked polymorphic region (5-HTTLPR) polymorphisms, may influence individual responses to interventions.
• Understanding these associations can personalize health strategies.

Purpose of the Study:

• To investigate the effect of a nutritional intervention on FBG levels in Japanese women.
• To examine the association between 5-HTTLPR genotypes and changes in FBG.
• To assess both short-term and long-term effects of the intervention.

Main Methods:

• A nutritional intervention program was implemented for 264 Japanese women without pre-existing conditions.
• Fasting blood glucose (FBG) was measured at baseline, end of intervention (11 weeks), and long-term follow-up (average 23 years).
• 5-HTTLPR allele frequencies (SS, LS, LL) were determined and correlated with changes in FBG (DeltaFBG).

Main Results:

• The SS genotype group exhibited significantly greater decreases in FBG compared to other genotypes in both short-term (P = 0.01) and long-term (P < 0.0001) studies.
• The study population showed distinct 5-HTTLPR allele frequencies compared to Caucasian populations.
• The intervention demonstrated a sustained impact on FBG levels over two decades.

Conclusions:

• The SS genotype of the 5-HTTLPR polymorphism is associated with a more pronounced reduction in fasting blood glucose following nutritional intervention.
• This finding suggests a potential genetic influence on metabolic response to dietary changes.
• Personalized nutritional strategies may be enhanced by considering 5-HTTLPR genotype.