L Manco1,2, H Dias1, M Muc1, C Padez1,2. 1. Department of Life Sciences, University of Coimbra, Coimbra, Portugal. 2. Research Centre for Anthropology and Health (CIAS), University of Coimbra, Coimbra, Portugal.
Abstract
BACKGROUND/ OBJECTIVES: Several studies reported associations of the lactase gene (LCT) polymorphism -13910C>T (rs4988235) with obesity-related variables and obesity in adults. This study aimed to replicate previously reported associations in a population sample of Portuguese young adults. SUBJECTS/ METHODS: We genotyped 447 subjects from central and northern regions of Portugal (mean age 20.81±4.24 years) for the lactase variant -13910C>T (rs4988235), using TaqMan probes. Anthropometric variables (weight, height and body fat) were measured using standardized procedures and body mass index (BMI) (kg/m2) was calculated. RESULTS: Frequency of genotypes was 35.8% CC (lactase nonpersistent, LNP), 48.1% CT and 16.1% TT, consistent with Hardy-Weinberg equilibrium (P=1). The frequency for the minor -13910 T allele was 0.402. Assuming a dominance model for the lactase persistence (LP) minor T-allele, linear regression models showed statistically significant associations between the LP genotype CT/TT and BMI, fat mass and weight (β=1.114, P=0.003; β=1.309, P=0.007 and β=2.67, P=0.021, respectively) after adjustment for age and sex. In concordance, logistic regression showed significant association between LP genotype CT/TT and overweight/obesity (OR=1.77; CI 1.08-2.92; P=0.023), as well as with high fat percentage ranges (OR=1.58; CI 1.01-2.46; P=0.041), when adjusting for age and sex. No significant interaction was obtained between the LCT polymorphism and physical activity for BMI (Pint=0.454) or FAT % (Pint=0.421). CONCLUSIONS: In the Portuguese sample of young adults, the lactase -13910C>T polymorphism revealed significant associations with the obesity-related anthropometric variables BMI, fat mass and weight, and previously observed associations with the obesity risk were also confirmed.
BACKGROUND/ OBJECTIVES: Several studies reported associations of the lactase gene (LCT) polymorphism -13910C>T (rs4988235) with obesity-related variables and obesity in adults. This study aimed to replicate previously reported associations in a population sample of Portuguese young adults. SUBJECTS/ METHODS: We genotyped 447 subjects from central and northern regions of Portugal (mean age 20.81±4.24 years) for the lactase variant -13910C>T (rs4988235), using TaqMan probes. Anthropometric variables (weight, height and body fat) were measured using standardized procedures and body mass index (BMI) (kg/m2) was calculated. RESULTS: Frequency of genotypes was 35.8% CC (lactase nonpersistent, LNP), 48.1% CT and 16.1% TT, consistent with Hardy-Weinberg equilibrium (P=1). The frequency for the minor -13910 T allele was 0.402. Assuming a dominance model for the lactase persistence (LP) minor T-allele, linear regression models showed statistically significant associations between the LP genotype CT/TT and BMI, fat mass and weight (β=1.114, P=0.003; β=1.309, P=0.007 and β=2.67, P=0.021, respectively) after adjustment for age and sex. In concordance, logistic regression showed significant association between LP genotype CT/TT and overweight/obesity (OR=1.77; CI 1.08-2.92; P=0.023), as well as with high fat percentage ranges (OR=1.58; CI 1.01-2.46; P=0.041), when adjusting for age and sex. No significant interaction was obtained between the LCT polymorphism and physical activity for BMI (Pint=0.454) or FAT % (Pint=0.421). CONCLUSIONS: In the Portuguese sample of young adults, the lactase -13910C>T polymorphism revealed significant associations with the obesity-related anthropometric variables BMI, fat mass and weight, and previously observed associations with the obesity risk were also confirmed.
Authors: Catherine J E Ingram; Charlotte A Mulcare; Yuval Itan; Mark G Thomas; Dallas M Swallow Journal: Hum Genet Date: 2008-11-26 Impact factor: 4.132
Authors: Nabil Sabri Enattah; Timo Sahi; Erkki Savilahti; Joseph D Terwilliger; Leena Peltonen; Irma Järvelä Journal: Nat Genet Date: 2002-01-14 Impact factor: 38.330
Authors: Catherine S Berkey; Graham A Colditz; Helaine R H Rockett; A Lindsay Frazier; Walter C Willett Journal: Cancer Epidemiol Biomarkers Prev Date: 2009-06 Impact factor: 4.254
Authors: Yoriko Heianza; Dianjianyi Sun; Wenjie Ma; Yan Zheng; Catherine M Champagne; George A Bray; Frank M Sacks; Lu Qi Journal: Int J Obes (Lond) Date: 2018-02-26 Impact factor: 5.095
Authors: Karani Santhanakrishnan Vimaleswaran; Ang Zhou; Alana Cavadino; Elina Hyppönen Journal: Int J Obes (Lond) Date: 2021-05-24 Impact factor: 5.095