Abstract
BACKGROUND:
The phospholipid transfer protein (PLTP) may play a role in body fat regulation.
OBJECTIVE:
To investigate the association between PLTP genetic variants and obesity-related phenotypes.
METHODS:
Two intronic variants, one in intron 1 (c.−87G>A) and the other in intron 12 (c.1175+68T>G), were genotyped in 811 participants of the Québec Family Study. Nine obesity-related phenotypes were investigated, including body mass index (BMI), obesity (BMI≥30 kg/m2), and waist circumference, percentage of fat, fat mass and fat-free mass measured by hydrostatic weighing as well as total, visceral and subcutaneous abdominal adipose tissue areas assessed by computed tomography. Single markers and haplotypes were tested for associations in family-based designs using the FBAT program.
RESULTS:
The SNP located in intron 1 showed significant associations with obesity, BMI, waist circumference and fat-free mass (P<0.05). The low-frequency allele (A allele) was associated with higher trait values, suggesting that the transmission of this allele is associated with an increased risk of being obese. Significant associations were observed between haplotypes and obesity, waist circumference, percentage of fat and fat-free mass (P<0.05). The transmission of the AT haplotype (frequency=0.180) was positively associated with obesity-related phenotypes. After sequencing the promoter and the coding regions of the PLTP gene, we were unable to identify a mutation that could replicate these results.
CONCLUSION:
Intronic variants of the PLTP gene are significantly associated with obesity-related phenotypes. Considering the number and the relevance of candidate genes surrounding the PLTP locus and the absence of missense polymorphisms in the coding region, the associations could be mediated by a second gene allele in linkage disequilibrium with the marker locus.
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Acknowledgements
This study was supported by the Canadian Institutes of Health Research (MOP-13960). We would like to express our gratitude to the subjects for their excellent collaboration and to the staff of the Physical Activity Sciences Laboratory for their contribution to the study. Y Bossé is the recipient of a studentship from the Canadian Institutes of Health Research. L Bouchard is recipient of a studentship from the ‘Fonds de la recherche en santé du Québec (FRSQ)’. MC Vohl is a research scholar of the FRSQ. JP Després is chair professor of human nutrition, lipidology and prevention of cardiovascular disease supported by Provigo and Pfizer Canada. C Bouchard is partially funded by the George A Bray Chair in Nutrition.
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Bossé, Y., Bouchard, L., Després, JP. et al. Haplotypes in the phospholipid transfer protein gene are associated with obesity-related phenotypes: the Québec Family Study. Int J Obes 29, 1338–1345 (2005). https://doi.org/10.1038/sj.ijo.0803010
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DOI: https://doi.org/10.1038/sj.ijo.0803010
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