title: Genetic variation in putative salt taste receptors and salt taste perception in humans.
abstract: The objective of this study was to determine whether single nucleotide polymorphisms (SNPs) in the SCNN1A (3), SCNN1B (12), SCNN1G (6), and TRPV1 (10) genes affect salt taste perception. Participants were men (n = 28) and women (n = 67) from the Toronto Nutrigenomics and Health study aged 21-31 years. Taste thresholds were determined using a 3-alternative forced-choice staircase model with solutions ranging from 9×10(-6) to 0.5 mol/L. Suprathreshold taste sensitivity to 0.01-1.0 mol/L salt solutions was assessed using general labeled magnitude scales. None of the SNPs in the SCNN1A and SCNN1G genes were significantly associated with either outcome. In the SCNN1B gene, 2 SNPs in intronic regions of the gene modified suprathreshold taste sensitivity (mean iAUC ± SE). Those homozygous for the A allele of the rs239345 (A>T) polymorphism and the T allele of the rs3785368 (C>T) polymorphism perceived salt solutions less intensely than carriers of the T or C alleles, respectively (rs239345: 70.82±12.16 vs. 96.95±3.75, P = 0.02; rs3785368: 57.43±19.85 vs. 95.57±3.66, P = 0.03) In the TRPV1 gene, the rs8065080 (C>T, Val585Ile) polymorphism modified suprathreshold taste sensitivity where carriers of the T allele were significantly more sensitive to salt solutions than the CC genotype (98.3±3.8 vs. 74.1±8.3, P = 0.008). Our findings show that variation in the TRPV1 and the SCNN1B genes may modify salt taste perception in humans.
authors.affiliation: Department of Nutritional Sciences, University of Toronto, Toronto, Ontario, Canada.
authors.forename: Andre G
authors.initials: AG
authors.lastname: Dias
authors.forename: Dérick
authors.initials: D
authors.lastname: Rousseau
authors.forename: Lisa
authors.initials: L
authors.lastname: Duizer
authors.forename: Moira
authors.initials: M
authors.lastname: Cockburn
authors.forename: Winnie
authors.initials: W
authors.lastname: Chiu
authors.forename: Daiva
authors.initials: D
authors.lastname: Nielsen
authors.forename: Ahmed
authors.initials: A
authors.lastname: El-Sohemy
mesh_terms: D000328:Adult; D053503:Epithelial Sodium Channels / Q000235:genetics*; D005260:Female; D006801:Humans; D008297:Male; D020641:Polymorphism, Single Nucleotide; D017673:Sodium Chloride, Dietary / Q000378:metabolism*; D050916:TRPV Cation Channels / Q000235:genetics*; D055697:Taste Perception; D013652:Taste Threshold; D055815:Young Adult
chemical_list: D053503:Epithelial Sodium Channels; D017673:Sodium Chloride, Dietary; D050916:TRPV Cation Channels