Medical Sciences Commons^™

Alpha-Amino-Beta-Carboxy-Muconate-Semialdehyde Decarboxylase Controls Dietary Niacin Requirements For Nad+ Synthesis, Laura Palzer, Jessica J. Bader, Frances Angel, Megan Witzel, Sydney Blaser, Alexis Mcneil, Miles K. Wandersee, N. Adrian Leu, Christopher J. Lengner, Clara E. Cho, Kevin D. Welch, James B. Kirkland, Ralph G. Meyer, Mirella L. Meyer-Ficca

Animal, Dairy, and Veterinary Science Faculty Publications

NAD⁺ is essential for redox reactions in energy metabolism and necessary for DNA repair and epigenetic modification. Humans require sufficient amounts of dietary niacin (nicotinic acid, nicotinamide, and nicotinamide riboside) for adequate NAD⁺ synthesis. In contrast, mice easily generate sufficient NAD⁺ solely from tryptophan through the kynurenine pathway. We show that transgenic mice with inducible expression of human alpha-amino-beta-carboxy-muconate-semialdehyde decarboxylase (ACMSD) become niacin dependent similar to humans when ACMSD expression is high. On niacin-free diets, these acquired niacin dependency (ANDY) mice developed reversible, mild-to-severe NAD⁺ deficiency, depending on the nutrient composition of the diet. NAD deficiency …