Association of cytochrome P450 1B1 gene expression in peripheral leukocytes with blood lipid levels in waste incinerator workers

Association of Leu432Val (rs1056836) polymorphism of the CYP1B1 gene with lipid profile in hypertensive Slovak women

Leu432Val (rs1056836) polymorphism of the CYP1B1 gene was examined in relationship with lipid profile in hypertensive Slovak women according to their menopausal status. The entire study sample comprised 255 women suffering from hypertension aged from 39 to 65 years who were recruited from different localities in the western, southern, and middle parts of Slovakia. The participants provided a saliva or blood sample for DNA genotyping and a blood sample for biochemical analysis. The Leu432Val genotypes demonstrated statistically significant associations with all monitored atherogenic indices – total cholesterol-to-HDL-Cholesterol (AI1), Non-HDL-Cholesterol (AI2), LDL-Cholesterol-to-HDL-Cholesterol (AI3), and the logarithm of the ratio of plasma concentration of triglycerides to HDL-cholesterol (AIP log) in hypertensive pre/perimenopausal women. The mean values were significantly lower in women carrying the Val/Val genotype. In early postmenopausal hypertensive women the Leu432Val genotypes were statistically significant and associated with LDL-cholesterol (LDL-C) and AI2. The mean values of LDL-C and AI2 were significantly lower in women carrying the Leu/Leu genotype. In conclusion, the Leu432Val polymorphism may be associated with the atherogenic indices and LDL-C in hypertensive women.

A Bayesian hierarchically structured prior for gene-based association testing with multiple traits in genome-wide association studies

Although genome-wide association studies (GWAS) often collect data on multiple correlated traits for complex diseases, conventional gene-based analysis is usually univariate, and therefore, treating traits as uncorrelated. Multivariate analysis of multiple correlated traits can potentially increase the power to detect genes that affect some or all of these traits. In this study, we propose the multivariate hierarchically structured variable selection (HSVS-M) model, a flexible Bayesian model that tests the association of a gene with multiple correlated traits. With only summary statistics, HSVS-M can account for the correlations among genetic variants and among traits simultaneously and can also estimate the various directions and magnitudes of associations between a gene and multiple traits. Simulation studies show that HSVS-M substantially outperforms competing methods in various scenarios, particularly when variants in a gene are associated with a trait in similar directions and magnitudes. We applied HSVS-M to the summary statistics of a meta-analysis GWAS on four lipid traits from the Global Lipids Genetics Consortium and identified 15 genes that have also been confirmed as risk factors in previous studies.

The association of Asn453Ser polymorphism in CYP1B1 gene with selected somatic and biochemical variables in Slovak women of different menopause status

OBJECTIVE

The aim of this study was to determine the relationship between the CYP1B1 Asn453Ser polymorphism and selected somatic and biochemical variables, and atherogenic indices in premenopausal and postmenopausal Slovak women.

METHODS

The studied sample consisted of 334 women; 188 premenopausal (mean age 45.73 ± 3.77 y) and 146 postmenopausal women (mean age 53.51 ± 4.52 y). The participants were interviewed during their medical examination. They provided a blood sample for biochemical analysis and DNA genotyping.

RESULTS

The frequency of rare allele Ser (CYP1B14) was equal to 0.125 in premenopausal and 0.168 in postmenopausal women. The observed genotype frequencies were in the Hardy-Weinberg equilibrium. The Asn453Ser genotype showed statistically significant associations with a high-density lipoprotein (HDL-cholesterol) and apolipoprotein A1 levels in postmenopausal women. The mean values of the above mentioned variables were significantly higher in women carrying the Ser/Ser genotype. The general linear model analysis confirmed the results of the additive genetic model in postmenopausal women and demonstrated significant association of the Asn453Ser polymorphism with HDL-cholesterol levels also in premenopausal women (P = 0.041).

CONCLUSIONS

This pilot study revealed a significant association of the CYP1B1 Asn453Ser genotypes with the plasma levels of HDL-cholesterol and of apolipoprotein A1 in postmenopausal women and less unequivocal findings in premenopausal women. Because of study limitations, these results need to be examined in a larger study.

The association of cytochrome P450 1B1 Leu432Val polymorphism with biological markers of health and menopausal symptoms in Slovak midlife women

OBJECTIVE

In this study, the CYP1B1 polymorphism was examined in relationship to recognized risk factors for cardiovascular disease. In particular, this study focused on plasma lipid levels, atherogenic indices, and body composition. Furthermore, this polymorphism was analyzed as a predisposing factor for menopausal symptoms among women during midlife, subdivided according to their menopause status.

METHODS

A total of 399 women aged from 39 to 60 years were examined. They were recruited from the western and middle parts of Slovakia. Participants were interviewed during their medical examination, and they were investigated with respect to a variety of aspects such as anthropometric and medical aspects, and a menopause-specific questionnaire was included. The participants provided a saliva or blood sample for DNA genotyping and a blood sample for biochemical analysis.

RESULTS

The Leu432Val genotype demonstrated statistically significant associations with triglycerides, with the ratio of total cholesterol to high-density lipoprotein cholesterol, and with the logarithm of the ratio of plasma concentration of triglycerides to high-density lipoprotein cholesterol in women in their reproductive period. The mean values were significantly lower in women carrying the Val/Val genotype. Four atherogenic indices showed a decreasing trend in relationship to the CYP1B1 genotypes in women during their reproductive period (in the following order of magnitude: Leu/Leu + Leu/Val vs Val/Val) and an increasing trend among postmenopausal women in the same order. Furthermore, the Val/Val genotype diminished experiences of bloated stomach, of vaginal dryness in perimenopausal and postmenopausal women, and of palpitations in premenopausal women.

CONCLUSIONS

The Leu432Val polymorphism may be associated with the lipid profile in midlife women. Moreover, this polymorphism may influence the risk of some menopausal symptoms.