Bariatric surgery is a surgical procedure frequently used to treat obesity and its comorbidities. Roux-en-Y gastric bypass (RYGB) is the gold standard bariatric surgery technique, which involves gastric reduction and intestinal bypass. Nutritional deficiencies are among the most common complications of bariatric surgery, including vitamin A deficiency, which may reach 11% after 1 year of RYGB, even with vitamin supplementation. Experimentally, the anatomical changes induced by the RYGB technique may influence the absorption of this micronutrient, since vitamin A is mainly absorbed in the duodenum and proximal jejunum, a segment excluded from the nutrient flux after RYGB. Two key genes are involved in vitamin A metabolism: the SCARB1 gene responsible for the passage of ²-carotene into the duodenum and the protein encoded by the BCO1 gene is the key enzyme that converts ²-carotene in vitamin A. In the present study, genes related to vitamin A metabolism will be analyzed in intestinal biopsies of patients submitted to RYGB, as well as the amount of supplementation received by these patients and plasma vitamin A concentrations. The study of the expression of genes involved in the metabolism of vitamin A in the intestinal tissue of patients after RYGB may lead us to better understand the potential mechanisms that contribute to the deficiency of this micronutrient.
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