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Triallelic relationships between the serotonin transporter polymorphism and cognition among healthy older adults.

ABSTRACT: The biallelic serotonin transporter polymorphism (5-hydroxytryptamine transporter linked polymorphic region (5-HTTLPR)) is a common genetic sequence associated with serotonin transporter (5-hydroxytryptamine transporter (5-HTT)) expression, which is further modulated by a triallelic single-nucleotide polymorphism (rs25531). Recent studies using the biallelic 5-HTTLPR have identified a beneficial role of low 5-HTT expression on cognitive performance, although no studies have examined the impact of the triallelic 5-HTTLPR/rs25531 marker on cognitive performance among healthy older adults. In the present study, we addressed this issue in 84 healthy older adults genotyped for biallelic and triallelic variants of 5-HTT. Groups were created based on low, medium and high levels of expression, as indicated by the triallelic marker. Results indicated that individuals with low 5-HTT expression performed significantly better on a test of memory compared with individuals with medium 5-HTT expression. This suggests that possession of low-expressing genetic variants of 5-HTT is modestly associated with enhanced cognitive performance among healthy older adults.

SUBMITTER: Salminen LE

PROVIDER: S-EPMC6363532 | biostudies-literature | 2014 May

REPOSITORIES: biostudies-literature

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Triallelic relationships between the serotonin transporter polymorphism and cognition among healthy older adults.

Salminen Lauren E LE Schofield Peter R PR Pierce Kerrie D KD Lane Elizabeth M EM Heaps Jodi M JM Bolzenius Jacob D JD Baker Laurie M LM Luo Xi X Paul Robert H RH

The International journal of neuroscience 20131017 5

The biallelic serotonin transporter polymorphism (5-hydroxytryptamine transporter linked polymorphic region (5-HTTLPR)) is a common genetic sequence associated with serotonin transporter (5-hydroxytryptamine transporter (5-HTT)) expression, which is further modulated by a triallelic single-nucleotide polymorphism (rs25531). Recent studies using the biallelic 5-HTTLPR have identified a beneficial role of low 5-HTT expression on cognitive performance, although no studies have examined the impact o ...[more]

PMID: 24044728

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Project description:BackgroundThe serotonin (5-HT) transporter-linked polymorphic region (5-HTTLPR) moderates the relationship between stressful life events and depression. Given the high prevalence of depression in chronic pain, the primary aim of this preliminary study was to investigate the associations between the 5-HTTLPR and the severity of depressive symptoms in a cohort of adults with chronic pain.MethodsAdults with chronic pain who were consecutively admitted to an outpatient pain rehabilitation program and met inclusion criteria were recruited for study participation (n=277). Individuals were genotyped for the 5-HTTLPR (including rs25531) and categorized as high, intermediate, or low expressors of the 5-HT transporter. The severity of depressive symptoms at admission was measured by using the Center for Epidemiologic Depression scale (CES-D).ResultsThe distribution of the high-, intermediate-, and low-expressing genotypes was 61 (22%), 149 (54%), and 67 (24%), respectively. The Hardy-Weinberg P-value was 0.204, which indicated no departure from equilibrium. A main effect of 5-HTTLPR was observed for depressive symptoms (P=0.040) where Center for Epidemiologic Depression scale (CES-D) scores were significantly greater in the low-expressing group compared to the high- (P=0.019) and intermediate (P=0.029)-expressing groups. In multivariate multinomial logistic regression analysis adjusted for age, sex, pain severity, pain catastrophizing, and pain anxiety, greater CES-D scores were significantly associated with the 5-HTTLPR low-expressing group compared to the high-expressing group (P=0.023), but not for the low-expressing group compared to the intermediate-expressing group (P=0.056).ConclusionThese preliminary findings suggest that the triallelic 5-HTTLPR could influence the severity of depressive symptoms in adults with chronic pain. Individuals with chronic pain may be particularly vulnerable to the moderating effects of 5-HTTLPR due to high levels of pain-related stress that are inherently present in this population.

Project description:Based on prior research finding the 5HTTLPR L allele associated with increased cardiovascular reactivity to laboratory stressors and increased risk of myocardial infarction, we hypothesized that the 5HTTLPR L allele will be associated with increased blood pressure (BP) and increased hypertension prevalence in 2 large nationally representative samples in the United States and Singapore. METHODS:Logistic regression and linear models tested associations between triallelic (L'S', based on rs25531) 5HTTLPR genotypes and hypertension severity and mean systolic and diastolic blood pressure (SBP and DBP) collected during the Wave IV survey of the National Longitudinal Study of Adolescent to Adult Health (Add Health, N=11,815) in 2008-09 and during 2004-07 in 4196 Singaporeans. RESULTS:In US Whites, L' allele carriers had higher SBP (0.9 mm Hg, 95% CI=0.26-1.56) and greater odds (OR=1.23, 95% CI=1.10-1.38) of more severe hypertension than those with S'S' genotypes. In African Americans, L' carriers had lower mean SBP (-1.27mm Hg, 95% CI=-2.53 to -0.01) and lower odds (OR = 0.78, 95% CI=0.65-0.94) of more severe hypertension than those with the S'S' genotype. In African Americans, those with L'L' genotypes had lower DBP (-1.13mm Hg, 95% CI=-2.09 to -0.16) than S' carriers. In Native Americans, L' carriers had lower SBP (-6.05mm Hg, 95% CI=-9.59 to -2.51) and lower odds of hypertension (OR = 0.34, 95% CI=0.13-0.89) than those with the S'S' genotype. In Asian/Pacific Islanders those carrying the L' allele had lower DBP (-1.77mm Hg, 95% CI=-3.16 to -0.38) and lower odds of hypertension (OR = 0.68, 95% CI=0.48-0.96) than those with S'S'. In the Singapore sample S' carriers had higher SBP (3.02mm Hg, 95% CI=0.54-5.51) and DBP (1.90mm Hg, 95% CI=0.49-3.31) than those with the L'L' genotype. CONCLUSIONS:These findings suggest that Whites carrying the L' allele, African Americans and Native Americans with the S'S' genotype, and Asians carrying the S' allele will be found to be at higher risk of developing cardiovascular disease and may benefit from preventive measures.

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Triallelic relationships between the serotonin transporter polymorphism and cognition among healthy older adults.

Publications

Triallelic relationships between the serotonin transporter polymorphism and cognition among healthy older adults.

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