- Research Article
- Open Access
Methylation profile of the ADRB3 gene and its association with lipid profile and nutritional status in adults
Biological Research volume 52, Article number: 21 (2019)
Defects in DNA methylation have been shown to be associated with metabolic diseases such as obesity, dyslipidemia, and hypercholesterolemia. To analyze the methylation profile of the ADRB3 gene and correlate it with lipid profile, lipid intake, and oxidative stress based on malondialdehyde (MDA) and total antioxidant capacity (TAC), homocysteine and folic acid levels, nutritional status, lifestyle, and socioeconomic variables in an adult population. A cross-sectional epidemiological study representative of the East and West regions of the municipality of João Pessoa, Paraíba state, Brazil, enrolled 265 adults of both genders. Demographic, lifestyle, and socioeconomic questionnaires and a 24-h recall questionnaire were applied by trained interviewers’ home. Nutritional and biochemical evaluation (DNA methylation, lipid profile, MDA, TAC, homocysteine and folic acid levels) was performed.
DNA hypermethylation of the ADRB3 gene, analyzed in leukocytes, was present in 50% of subjects and was associated with a higher risk of being overweight (OR 3.28; p = 0.008) or obese (OR 3.06; p = 0.017), a higher waist–hip ratio in males (OR 1.17; p = 0.000), greater intake of trans fats (OR 1.94; p = 0.032), higher LDL (OR 2.64; p = 0.003) and triglycerides (OR 1.81; p = 0.031), and higher folic acid levels (OR 1.85; p = 0.022).
These results suggest that epigenetic changes in the ADRB3 gene locus may explain the development of obesity and non-communicable diseases associated with trans-fat intake, altered lipid profile, and elevated folic acid. Because of its persistence, DNA methylation may have an impact in adults, in association with the development of non-communicable diseases. This study is the first population-based study of the ADRB3 gene, and the data further support evaluation of ADRB3 DNA methylation as an effective biomarker.
DNA methylation is the most well-known epigenetic modification, and it is performed by the enzyme family of DNA methyltransferases (DNMTs), which catalyze the transfer of a methyl group from S-adenosylmethionine (SAM) to the 5′-carbon of a cytosine that precedes guanine (CpG dinucleotide) . Methylation frequently occurs in gene promoter regions, which are often rich in CpG dinucleotides and are thus called CpG islands. DNA hypermethylation inhibits gene transcription by preventing the binding of transcription factors or by binding methyl-CpG-binding proteins (MBPs) .
Epigenetics involves hereditary changes in gene expression that do not involve changes in the DNA sequence; these changes are reversible and may be repetitively transferred to subsequent generations [5, 6]. The three main characteristics of epigenetics are: (1) no changes in DNA sequence, (2) inheritability, and (3) plasticity and reversibility .
Unlike the genome, the epigenome can be modified, and thus some epigenetic risk markers have the potential to be removed. These modifications can be caused by medications, diet, or exposure to environmental factors . These factors, when associated with oxidative stress and inflammation, tend to influence the DNA methylation profile or histone modifications . This specific knowledge may lead to the development of potential therapeutic targets for the prevention and treatment of non-communicable diseases.
On the other hand, it is known that genes involved in metabolism can contribute to differences among individuals in regard to nutrient requirements and susceptibility to disease . One of these genes is ADRB3, beta-3 adrenergic receptor, which has been associated with dyslipidemia . ADRB3 is located on chromosome 8 and contains a CpG island in its promoter region. ADRB3 is expressed in the white and brown adipose tissues  and in peripheral lymphocytes , also is involved in lipolysis and thermogenesis regulation. Only two studies have evaluated the methylation profile of ADRB3 in an obese population. One of the studies showed that ADRB3 expression is lower in this population [2, 14]. The decreased expression of this gene may lead to poor performance in lipolysis regulation in human brown and white adipose tissues that provide free fatty acids for thermogenesis, i.e., there is indirect evidence from the studies conducted that ADRB3 participates in the regulation of body weight in humans .
Studies evaluating the importance of the association of the DNA methylation profile with lifestyle (dietary habits, alcohol consumption, smoking, and physical activity), biochemical values, and nutritional status in adults should promote new research to support intervention strategies in the fight against non-communicable diseases [15, 16].
In this context, we describe the first population-based study of the ADRB3 gene to analyze the ADRB3 methylation profile and its association with nutritional status, lipid intake, lipid profile, and biochemical, lifestyle, and socioeconomic markers in adults of both genders.
This cross-sectional epidemiological study is linked to the project titled: “II Cycle of Diagnosis and Intervention of Food and Nutritional Status and the Most Prevalent Non-Communicable Diseases in the Population of the Municipality of João Pessoa/PB” (II Ciclo de Diagnóstico e Intervenção da Situação Alimentar, Nutricional e das Doenças não Transmissíveis mais Prevalentes da População do Município de João Pessoa/PB, II DISANDNT/PB). Data were collected between May 2015 and May 2016.
This study was approved by the Research Ethics Committee of the Health Sciences Center (Centro de Ciências da Saúde, CCS) of the Federal University of Paraíba (Universidade Federal da Paraíba, UFPB) under protocol number 0559/2013 in accordance with the ethical standards for research involving human beings included in Resolution 466 of the December 12, 2012 meeting of the National Health Council/National Research Ethics Committee. Participants provided consent by signing an informed consent form.
To conduct this population-based study that was representative of the East and West regions of the municipality of João Pessoa, a sample that was representative of the adult group was calculated using information provided by the city hall, such as the city map, number of blocks per neighborhood, and data from the Brazilian Institute of Geography and Statistics (Instituto Brasileiro de Geografia e Estatística, IBGE) .
For the sample calculation, a single stratified sampling procedure was used. Given the heterogeneity of the variable “income” and the relationship between income, disease prevalence, and nutrition , a stratified sampling approach was used  for the blocks at a first level. At this level, the neighborhoods of the East and West regions of the municipality were classified into four income strata according to information obtained from the IBGE .
All the neighborhoods (24) of the East and West regions of the municipality of João Pessoa were visited, totaling 2988 blocks, with an estimate of visits for 105 blocks (Fig. 1). After determining the number of blocks to be sampled in each neighborhood, a random drawing was performed. For this purpose, the city map with the numbered blocks was used, and random numbers with uniform distribution were generated using a pseudorandom number generator and the Core R Development Team (2006) software for selection. The diagram for the definition of the sample representative of the East and West regions of the municipality of João Pessoa/PB is shown in Fig. 1.
This study had the following as inclusion criteria: individuals aged 20–59 years; different socioeconomic conditions, and medication users and non-users. Exclusion criteria included the following: individuals with neuropsychiatric disorders; multivitamin, mineral, anorexigen, and anabolic supplement users; and pregnant and lactating women.
The household visits and application of the questionnaires were conducted by teams of researchers who were trained before initiating data collection after the pilot study was conducted. The trained teams, upon recognition of the blocks selected, were instructed to select all the households in the block. At each household selected, all the adults aged 20–59 years were invited to participate in the study through the application of questionnaires for demographic, socioeconomic, and epidemiological characterization and nutritional and food intake assessment, and biochemical evaluation and ADRB3 gene methylation profiling were performed with consent signed.
Weight and height measurements were taken in triplicate, and the average of the three values was used. The World Health Organization (WHO) recommends the following cutoffs of body mass index (BMI) to classify the nutritional status of adults between 20 and 59 years of age: < 18.5 kg/m2 (underweight), 18.5–24.9 kg/m2 (normal weight), 25.0–29.9 kg/m2 (overweight), 30.0–39.9 kg/m2 (obesity), and ≥ 40 kg/m2 (morbidly obese) .
The indicators used to determine the abdominal obesity status were waist circumference and waist–hip ratio (WHR). The American Heart Association recommends cutoffs of waist circumference to determine the abdominal obesity status of ≥ 102 cm in men and ≥ 88 cm in women . According to the WHO, abdominal obesity is defined as a WHR > 0.90 in men and > 0.85 in women .
Food intake data were obtained through interviews conducted at the participant’s house on two business days and one weekend day, using 24-h recall. More specifically, all the participants in the study were asked to describe the type and amount of food and drinks consumed the day before.
In order to effectively quantify the consumed portion sizes and to minimize potential memory biases of the individuals studied [22,23,24]. Common household measures (cups, spoons, etc.) were used, and a book with images of food depicted in household measures in four sizes (small, medium, large, and extra-large) were used to ascertain the actual weight of the food products consumed.
The food data were converted into the respective macro and micronutrient values and analyzed using DietWin software version 2013. For the assessment of nutrient intake, only complete 24-hour recalls with energy intake between 500 and 5000 kcal/day were considered [25, 26]. Nutrient intake data were adjusted for inter and intra-individual variations using the Multiple Source Method (MSM) available online  (https://msm.dife.de/tps/msm/).
Individual energy intake calculation
Calorie intake was calculated individually and for each gender, according to the formula proposed by OTTEN et al. . For men, EER = 662 − (9.53 × age (years) + PA × [(15.91 × weight (kg)) + (539.6 × height (m))], and for women, EER = 354 − (6.91 × age (years) + PA × [(9.36 × weight (kg)) + (726 × height (m))], where EER is the estimated energy requirements, and PA is the physical activity factor.
Blood was collected from fasting subjects on the third day of household visits. The blood was collected by an experienced nurse.
Vacutainers® were used (two 4-mL tubes) for the blood collection. One was for serum analysis (tube with clot activator), and the other was for plasma analysis (with ethylenediaminetetraacetic acid [EDTA] anticoagulant). The tubes were maintained inside a thermal box during blood collection, where they remained for a maximum of 2 h.
Lipid profiling was performed using kits commercial (Labtest® Brazil) to measure total cholesterol through the Trinder enzymatic method, high-density lipoprotein cholesterol (HDL-C) through the precipitation method, and triglycerides through the Trinder enzymatic method. Values for plasma low-density lipoprotein cholesterol (LDL-C) were estimated by the equation proposed , where (LDL-C = Total Cholesterol − HDL-C − Triglycerides/5). Malondialdehyde (MDA) was quantified through the reaction of thiobarbituric acid (TBA) with hydroperoxide decomposition products, as described by Ohkawa, Ohishi, and Yagi .
The total antioxidant capacity (TAC) was measured with DPPH (1.25 mg diluted in 100 mL of ethanol and protected from light) [All tests were performed at the Research Laboratory of Physical Training Applied to Performance and Health (Laboratório de Estudos do Treinamento Físico Aplicado ao Desempenho e a Saúde, LETFADS) at the Department of Physical Education of the Federal University of Paraíba].
Homocysteine and folic acid concentrations were measured at the Roseane Dore Clinical Laboratory. Homocysteine was quantified with the method described by Pfeiffer et al., using high-performance liquid chromatography (HPLC) with fluorescence detection and isocratic elution  with an analytical sensitivity of 1.74 µmol/L. Folic acid was analyzed with the chemiluminescence method, considering the reference value > 3.10 ng/mL and an analytical sensitivity of 0.5 ng/mL.
DNA methylation profile
Sample extraction and isolation of genomic DNA
Genomic DNA was extracted from the leukocytes using TRIZOL LS (Life Technologies, California, USA) according to the manufacturer’s recommendations. Genomic DNA was quantified with a Nanodrop® spectrophotometer (Thermo Scientific, California, USA) and stored at − 20 °C until further analysis.
DNA methylation analysis of the ADRB3 gene promoter
Methylation analysis was performed using methylation-specific PCR (MSP). Genomic DNA (800 ng) was modified with sodium bisulfite using the Cells-to-CpG™ Bisulfite Conversion Kit (Life Technologies) according to the manufacturer’s specifications. The CpG sites studied are located in a CpG island in the promoter region spanning nucleotides − 807 to − 747, as confirmed by the Methyl Primer Express v.1.0 software (Applied Biosystems) from data deposited in GenBank. The differences in DNA sequences after treatment were detected by PCR using primers specific for methylated (F: 5′-GTAGGAGAAGCGTTTGAATTC-3′, R: 5′-TTTTTTAAAACGACGTCTCG-3′) and unmethylated DNA (F: 5′-GAGGTAGGAGAAGTGTTTGAATTT-3′, R:5′-TTTTTTTAAAACAACATCTCACT-3′) sequences, generating a 109-bp fragment (GenBank accession number DQ104441.1) (see Fig. 2). Each MSP reaction included 100 ng of bisulfite-modified DNA, 1 µL (10 µM) of each primer and Go Taq Hot Start Green Master Mix 1× (Promega Corporations, Madison, WI, USA) in a 25-µL of final reaction volume. The conditions for fragment amplification were as follows: 95 °C × 5 min; 40 cycles of 95 °C × 1 min, 60 °C − methylation conditions/55 °C − non-methylation conditions − × 1 min, and 72 °C × 7 min, and a final elongation at 72 °C × 5 min. Following amplification, 10 µL of the PCR samples were loaded onto a 10% polyacrylamide gel for electrophoresis and stained with Gel Red (Biotium). Methylated and unmethylated DNA (Cells-to CpG™ Methylated and Unmethylated gDNA Control Kit, Life Technologies) was modified as previously described and amplified by PCR for use as positive controls (see Fig. 2).
An initial descriptive analysis of the characteristics of the sample represented by simple frequencies was performed using measures of central tendency and dispersion (mean, standard deviation, and median). The data were evaluated for normality using the Lilliefors test, a modification of the Kolmogorov–Smirnov test . Statistical analysis was conducted with STATA 13 software . To calculate nonlinear regression, odds ratio was used, and the median of the continuous variables was used to identify the coefficient’s signal and the existence of a significant association between the variables. All variables with p value < 0.05 were included in the model and considered significant.
Data on anthropometric, food intake, and biochemical characteristics of the study are presented with the methylation status of ADRB3 in Table 1. The total study population was predominantly women, and more than half of the adults were overweight and obese based on the BMI. Approximately 50% of the population studied presented hypermethylation of ADRB3 (Table 1).
In Table 2, the nutritional status and the median values for regular energy, total fat, saturated fat, monounsaturated fat, polyunsaturated fat, cholesterol, and trans-fat intake were analyzed for the hypermethylated individuals. The individuals who were overweight had a 228% great chance of ADRB3 hypermethylation (OR 3.28), and obese individuals had a 206% great chance of hypermethylation (OR 3.06); men with a WHR > 0.90 cm had a 17% great chance of hypermethylation (OR 1.17), and individuals with a trans-fat intake above the median had a 94% (OR 1.94) higher chance of hypermethylation. For folate intake, the OR was lower than 1 and was not considered a risk factor.
In Table 3, the median values of blood lipids, oxidative stress, homocysteine, and folic acid were also used, and an association with cholesterol values greater than the median was observed, which indicates that individuals with values above the median present a 1  % greats chance of having ADRB3 hypermethylation (OR 2.27).
LDL above the median had a 164% higher chance of ADRB3 hypermethylation, whereas individuals with triglyceride values above the median had an 81% (OR 1.81) higher chance of hypermethylation, further, individuals with folic acid values below the median had a 85% higher chance of hypermethylation.
In Table 4, the prevalence of inadequate energy; total, saturated, monounsaturated, polyunsaturated, and trans-fat; cholesterol, and folate intake is shown. The majority of the adults had a calorie intake below the recommended intake (80.6%), and total, monounsaturated, and polyunsaturated fat intakes were within the recommended range. With regard to saturated fat intake, the majority of subjects reported intake below the recommended value, and the same situation was observed for folate intake.
The results of this study demonstrate that ADRB3 gene methylation was present in half of the population studied; the majority of the population were women, overweight or obese, had an average income of 1458.43 USD, and completed middle school.
This methylation profile was associated with being overweight and obese for both genders and with a higher waist–hip ratio for men. In regard to regular nutrient intake, hypermethylation was only associated with a trans-fat intake above the median, and when correlated with the lipid profile, there was a significant association with cholesterol, LDL, and triglyceride levels above the median, in addition to an association with folic acid values below the median.
Hypermethylation of the ADRB3 gene promoter in blood cells and visceral fat tissue has previously been associated with the development of obesity and metabolic complications in men . By contrast, a different study revealed that there is no association between obesity and ADRB3 hypermethylation in the fat tissue of obese men , but it is not clear in that study which CpG site in the promoter was studied, and decreased ADRB3 expression was observed in this population. It is known that methylation profiles can vary in different tissues  and CpG sites , and it can also vary for populations that differ in intrinsic factors such as age or gender [36, 37] and extrinsic factors such as diet and smoking [15, 35], which may explain the difference between the studies.
In the study conducted by Oliveira et al. , it was observed that higher levels of methylation were not associated with lipid profile and oxidative stress, when the individuals were separated according to eutrophic, overweight and obesity classification, the study used the analysis of methylation levels by real-time PCR method, MS-HRM, in addition in the present study the whole sample was used.
Also, in regard to the associations found in this study among ADRB3 DNA hypermethylation, an increased likelihood of being overweight or obese, and a higher waist–hip ratio for men, It has been suggest that the expression of the ADRB3 gene, which codes for the β-adrenergic receptor, was significantly reduced in fat tissue of obese individuals . In regard to the waist–hip ratio, Guay et al.  also found that ADRB3 hypermethylation was associated with a higher waist–hip ratio in men with a diagnosis of hypercholesterolemia.
Further studies must be conducted because the waist–hip ratio better defines abdominal obesity which. Men have more visceral fat, and women have more subcutaneous fat due to the effects of sexual hormones, which play an important role in the regulation of body fat distribution , although the molecular mechanisms involved remain obscure. More work is needed to be investing the association between genetics and sexual hormones .
Another relevant finding of this study was the correlation of hypermethylation with regular trans-fatty acid (TFA) intake, even with a median intake below the recommended allowance . There are no studies available for comparative purposes, but it is thought that the intake of this type of fatty acids may be associated with the development and worsening of cardiovascular disease .
There was no association found between ADRB3 methylation and total energy or nutrient intake, but the food ingested by the majority of the population studied was within the recommended range based on the calculation of the prevalence of inadequate consumed dietary components, noting that calorie requirements were calculated individually for the whole population based on the variables gender, age, physical activity, weight, and height . For other nutrients, the intake was lower or within the recommended range for more than 60% of the population. A high prevalence of inadequate folate intake was observed, affecting 88% of the studied population, and no association between ADRB3 hypermethylation and folate intake was observed.
However, regarding the individuals who perform physical activity, less than 50% classified as active based on the American College of Sports Medicine , and the majority had a healthy lifestyle considering the other lifestyle variables.
The association of ADRB3 hypermethylation with the blood lipid profile was also investigated, and a significant association of hypermethylated individuals presenting higher total cholesterol, LDL-C, and triglyceride levels was observed, but no association with HDL-C was seen. These findings agree with studies conducted by Guay et al. , who justify this association with the fact that the ADRB3 gene is a potential candidate for dyslipidemia.
No significant association was found with homocysteine, and homocysteine levels above the reference values were not observed in this study, which may explain the absence of an association.
Folic acid intake was within the recommended values and showed an association with individuals with hypermethylated ADRB3, as found by Claycombe et al.  folic acid is a well-known methyl donor and thus has a relevant impact on the methylation profile .
Oxidative stress was also associated with ADRB3 hypermethylation, but not to a level of significance. However, the levels of the oxidative stress indicators used in the present study, TAC and MDA, were within the reference range. In the literature, there are only reports of the induction of DNA methylation changes by the inflammatory process [46, 47].
With regard to the function of ADRB3 in energy intake, lipid profile, and folic acid levels, the study of epigenetic variation in this gene may contribute to a better understanding of the molecular basis of obesity and cardiovascular diseases.
In this first analysis of DNA methylation of the ADRB3 gene in a population-based study, the most relevant results obtained were the high prevalence and association between ADRB3 DNA hypermethylation with overweight and obesity in both genders, a higher waist–hip ratio for men, higher trans-fat intake, an altered lipid profile, and decreased folic acid intake.
Therefore, considering that DNA methylation may have an impact in adulthood because of its persistence, in particular in regard to the development of non-communicable diseases, data from this study may help in the use of DNA methylation as an effective biomarker. Moreover, the study of epigenetic changes may contribute to a better understanding of the frequently observed associations between lifestyle factors, genetics, and metabolic disorders. However, additional studies must be conducted to determine if the findings of this study are causal or correlative.
total antioxidant capacity
Multiple Source Method
high-performance liquid chromatography
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RPAL contributed to data management, statistical analysis, data interpretation, and the writing of the manuscript. MRR, ES, DC and RAFN contributed to data acquisition and biochemical tests. RCP Luna contributed to data management. NFPO coordinated the DNA methylation analyses and was involved in the critical review of the manuscript. MCRG and RPTV, were involved in the development of the manuscript or in the critical review of relevant intellectual content. ATCA and RMM contributed to study design and statistical analysis. MJCC contributed to study design, statistical analysis, data interpretation, and writing the manuscript; she coordinated data collection and was involved in the development of the manuscript or in the critical review of relevant intellectual content. All authors read and approved the final manuscript.
We would like to acknowledge the project coordinator, Prof. Dr. Maria José de Carvalho Costa, and her team composed of teachers, master’s, doctoral and undergraduate students and research collaborators (Post-Graduation program in Nutritional Sciences/Federal University of Paraíba).
The authors declare that they have no competing interests.
Availability of data and materials
The data generated in this study are coordinated by Dr. Maria José de Carvalho Costa.
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The study was approved by the Research Ethics Committee of the CCS/UFPB, under the Protocol Number 0569/15.
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Lima, R.P.A., Ribeiro, M.R., de Farias Lima, K.Q. et al. Methylation profile of the ADRB3 gene and its association with lipid profile and nutritional status in adults. Biol Res 52, 21 (2019). https://doi.org/10.1186/s40659-019-0226-7
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