Abstract
The regulation of the hypothalamic-pituitary-adrenal (HPA) axis is associated with polymorphisms and the methylation degree of the glucocorticoid receptor gene (NR3C1) and is potentially involved in the development of metabolic syndrome (MetS). In order to evaluate the association between MetS with the polymorphisms, methylation, and gene expression of the NR3C1 in the genetically isolated Brazilian Mennonite population, we genotyped 20 NR3C1 polymorphisms in 74 affected (MetS) and 138 unaffected individuals without affected first-degree relatives (Co), using exome sequencing, as well as five variants from non-exonic regions, in 70 MetS and 166 Co, using mass spectrometry. The methylation levels of 11 1F CpG sites were quantified using pyrosequencing (66 MetS and 141 Co), and the NR3C1 expression was evaluated via RT-qPCR (14 MetS and 25 Co). Age, physical activity, and family environment during childhood were associated with MetS. Susceptibility to MetS, independent of these factors, was associated with homozygosity for rs10482605*C (OR = 4.74, pcorr = 0.024) and the haplotype containing TTCGTTGATT (rs3806855*T_ rs3806854*T_rs10482605*C_rs10482614*G_rs6188*T_rs258813*T_rs33944801*G_rs34176759*A_rs17209258*T_rs6196*T, OR = 4.74, pcorr = 0.048), as well as for the CCT haplotype (rs41423247*C_ rs6877893*C_rs258763*T), OR = 6.02, pcorr = 0.030), but not to the differences in methylation or gene expression. Thus, NR3C1 polymorphisms seem to modulate the susceptibility to MetS in Mennonites, independently of lifestyle and early childhood events, and their role seems to be unrelated to DNA methylation and gene expression.
| Original language | English |
|---|---|
| Article number | 1805 |
| Journal | Genes |
| Volume | 14 |
| Issue number | 9 |
| ISSN | 2073-4425 |
| DOIs | |
| Publication status | Published - 09.2023 |
Funding
We deeply thank all Mennonite participants for volunteering for this study, and the staff of the Human Molecular Genetics Laboratory (UFPR), for assistance in blood collection, interviews, and DNA/RNA extraction. We are also grateful to Monique de Souza Almeida Lopes, from INCA, for technical assistance in pyrosequencing. We extend our thanks to Danielle Malheiros Ferreira, for donating the material used for one experiment. The Genotype-Tissue Expression (GTEx) Project was supported by the Common Fund of the Office of the Director of the National Institutes of Health, and by NCI, NHGRI, NHLBI, NIDA, NIMH, and NINDS. eQTL and sQTL effects of genetic variants associated in this study were obtained from https://gtexportal.org/home/snp/ (accessed on 7 June 2023). This research was funded by Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) and Empresa Brasileira de Serviços Hospitalares (Ebserh) grant numbers 423317/2021-0 and 313741/2021-2 (8520137521584230), Research for the United Health SUS System (PPSUS-MS), CNPq, Fundação Araucária and SESA-PR, Protocol Nº: SUS2020131000106, and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES/PROAP – Finance Code 001). A.B.W.B. receives CNPq research productivity scholarships (protocols 314288/2018-0 and 313741/2021).
Research Areas and Centers
- Academic Focus: Center for Brain, Behavior and Metabolism (CBBM)
- Research Area: Medical Genetics
DFG Research Classification Scheme
- 2.22-17 Endocrinology, Diabetology, Metabolism
- 2.11-05 General Genetics and Functional Genome Biology