A examine printed within the journal Metabolism describes the impact of a polyphenol-rich Mediterranean weight loss plan on epigenetic regulation.
Examine: A polyphenol-rich inexperienced Mediterranean weight loss plan enhances epigenetic regulatory potential: the DIRECT PLUS randomized managed trial. Picture Credit score: Antonina Vlasova / Shutterstock
Background
Persistent low-grade irritation is taken into account a significant hallmark of varied metabolic ailments, together with weight problems. Due to this fact, way of life interventions, similar to a nutritious diet and bodily exercise, are very important in managing physique weight and decreasing morbidity and mortality dangers associated to metabolic ailments.
Plant-based polyphenols with excessive antioxidant properties are identified to have useful results on metabolism. Mechanistically, polyphenols inhibit key epigenetic regulators, similar to DNA-methyltransferases (DNMTs) or methylenetetrahydrofolate reductase (MTHFR), to modulate one-carbon metabolism and methylation processes. Furthermore, folic acid and B nutritional vitamins as methyl donors play essential roles in regulating DNA and histone methylases.
The Dietary Intervention Randomized Managed Trial Polyphenols Unprocessed (DIRECT PLUS) has been performed for 18 months to guage the metabolic influence of wholesome dietary tips (HDG), the Mediterranean (MED) weight loss plan, and a modified MED weight loss plan enriched with polyphenols (green-MED).
The findings of this randomized managed trial have revealed that each MED diets have a average influence on weight reduction and a powerful influence on hepatic fats discount. Particularly, the green-MED, which incorporates excessive quantities of walnuts and Mankai (duckweed or watermeal), has been discovered to trigger the very best discount in waist circumference, low-density lipoprotein-cholesterol serum degree, diastolic blood stress, C- reactive protein, and visceral adipose tissue. Each walnut and Mankai are wealthy sources of folate and B nutritional vitamins.
Within the present examine, scientists have explored whether or not green-MED diet-mediated metabolic enhancements noticed within the trial are related to its influence on genome-wide DNA methylation and mRNA expression patterns.
Examine design
The examine inhabitants included 260 individuals (common age: 51 years; physique mass index: 31 Kg/m2) from the DIRECT PLUS trial. They had been randomly categorized into three intervention teams, together with the HDG, MED weight loss plan, and green-MED weight loss plan teams. Whereas the MED weight loss plan included 440 mg of polyphenols moreover offered by walnuts, the green-MED weight loss plan included 1240 mg of polyphenols moreover offered by walnuts, inexperienced tea, and Mankai.
Blood samples collected from the individuals had been analyzed for genome-wide DNA methylation and mRNA expression patterns at baseline and after the completion of the 18-month intervention interval.
Necessary observations
The evaluation of genome-wide DNA methylation patterns earlier than and after the dietary interventions recognized 1,573 differentially methylated areas within the green-MED group, 377 within the HDG group, and 174 within the MED group. These findings corresponded to 1753 differentially expressed genes within the green-MED group, 738 within the HDG group, and solely 7 within the MED group.
The consumption of a polyphenol-rich green-MED weight loss plan for 18 months resulted in considerably increased ranges of folic acid and vitamin B-12 within the serum in comparison with different dietary interventions. The elevated ranges of folic acid and vitamin B-12 noticed within the MED group individuals at baseline might be attributed to decrease ranges of epigenetic modifications noticed on this group after the dietary intervention.
The excessive quantities of walnuts, inexperienced tea, and Mankai within the green-MED weight loss plan confirmed a direct affiliation with the elevated ranges of one-carbon precursors (folic acid and vitamin B-12) in individuals consuming this explicit weight loss plan. These observations collectively point out that green-MED diet-mediated modifications in DNA methylation patterns are related to elevated serum ranges of folic acid and vitamin B-12.
Along with having a considerable impact on one-carbon precursors related to de novo methylation processes, a polyphenol-rich green-MED weight loss plan confirmed a direct impact on the methylation and transcription of genes encoding epigenetic modulators, together with lysine demethylase 2B, lysine demethylase 5B, and histone lysine methyltransferase.
Weighted Cluster Community Evaluation
The examine performed a Weighted Cluster Community evaluation to establish key drivers of phenotypic modifications related to green-MED weight loss plan consumption. Three fundamental modules containing many of the differentially methylated area genes had been recognized. Of those modules, one was considerably related to C-reactive protein, folic acid, interleukin 6 (IL-6), and alter in deep-subcutaneous adipose tissue space; one was related to waist circumference; and one was related to waist circumference and physique weight change.
Within the first module, the mRNA expression of the KIR3DS1 gene confirmed a damaging affiliation with modifications in polyphenols however a optimistic affiliation with modifications in superficial-subcutaneous adipose tissue space, physique weight, and waist circumference. KIR3DS1 is a killer cell immunoglobulin-like receptor related to autoimmune ailments.
This module additionally included the differentially methylated area gene Cystathionine Beta-Synthase, an enzyme chargeable for decreasing homocysteine ranges. The mRNA expression of this gene was related to modifications in polyphenols.
Examine significance
The examine highlights {that a} polyphenol-rich MED weight loss plan can considerably regulate DNA methylation patterns by growing key epigenetic drivers similar to folic acid and vitamin B-12. Moreover, polyphenols current within the weight loss plan have excessive efficiency in regulating one-carbon metabolism with penalties in autoimmune responses.
Supply
Hoffmann A. 2023. A polyphenol-rich inexperienced Mediterranean weight loss plan enhances epigenetic regulatory potential: the DIRECT PLUS randomized managed trial. Metabolism. https://www.metabolismjournal.com/article/S0026-0495(23)00198-1/fulltext
