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[Association between FTO gene rs9939609 and adiposity markers in Chilean children]
Natalia Ulloa1, Marcelo Villagrán2, Benilde Riffo3
1Universidad de Concepción, Concepción, Chile.
Insights
The FTO gene
Area of Science:
- Genetics and Molecular Biology
- Pediatric Endocrinology
- Obesity Research
Background:
- Obesity is a complex chronic inflammatory disease with significant genetic influences.
- While the FTO gene's link to childhood adiposity is known, evidence in Chilean children is limited.
Purpose of the Study:
- To investigate the association between the FTO gene's rs9939609 polymorphism and adiposity markers in Chilean children.
- To provide population-specific genetic insights into childhood obesity.
Main Methods:
- A cross-sectional study of 361 Chilean children (6-11 years old).
- Genomic DNA was analyzed for the FTO rs9939609 single-nucleotide polymorphism (SNP).
- Adiposity markers (BMI, waist circumference, body fat, WC/H index) were measured and analyzed using linear regression, adjusted for covariates.
Main Results:
- A significant association was found between the FTO rs9939609 polymorphism and adiposity markers after adjustments.
- Each additional copy of the risk allele correlated with increased body weight, BMI, waist circumference, and body fat percentage.
- The waist-to-height index demonstrated the strongest association with the FTO risk allele.
Conclusions:
- This study confirms the association between the FTO rs9939609 SNP and markers of overall and central adiposity in Chilean children.
- Findings contribute to understanding the genetic underpinnings of obesity in this population.
Introduction:
Obesity is considered a chronic inflammatory disease with an important genetic component. Although several studies have reported an association between the FTO (fat-mass associated gene) and adiposity in children, there is limited evidence in the Chilean population.
Objective:
To deter mine the association between the polymorphism rs9939609 of the FTO gene and markers of adipo sity in Chilean children.
Patients And Method:
Cross-sectional study which included 361 children aged between 6 and 11 years (50% were girls). Between March and June 2008, clinical data and blood sample collection was carried out. The rs9939609 single-nucleotide polymorphism (SNP) of the FTO gene, was determined using the genomic DNA extracted from leukocytes, using the QIAamp DNA Blood Mini Kit (Qiagen GmbH, Hilden, Germany).The adiposity markers included were body mass index (BMI), waist circumference (WC), body fat, and WC/H index; which were later compared adjusted by sex, age, and Tanner stage. Linear regression analyses were conducted to detect the association between the polymorphism and obesity markers.
Results:
After adjusting the models by age, sex, and Tanner stage, we found a significant association between the polymorphism and markers of adiposity. For each extra copy of the risk allele, we found an increase of 2.47 kg body weight (95% CI: 1.39-3.55); 1.06 kg/m2 BMI (95% CI: 0.56-1.54); 2.55 cm WC, (95% CI: 1.26-3.85); and 1.98% body fat (95% CI: 0.78-3.19). When converting adiposity markers to z-score, we found that WC/height index shows the strongest association with the risk allele FTO.
Conclusion:
This study supports the association between the rs9939609 SNP of the FTO gene and overall and central adiposity markers in Chilean children.
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