Role of cobalamin (vitamin B12) and folic acid in nucleic acid and myelin metabolism. Lack of either cobalamin or folic acid retards DNA synthesis (A)

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Role of cobalamin (vitamin B12) and folic acid in nucleic acid and myelin metabolism. Lack of either cobalamin or folic acid retards DNA synthesis (A) and lack of cobalamin leads to loss of folic acid, which cannot be held intracellularly unless polyglutamated. Lack of cobalamin also leads to abnormal myelin synthesis, probably via a deficiency in methionine production (B). (Redrawn, with permission, from Chandrasoma P et al. Concise Pathology, 3rd ed. Originally published by Appleton & Lange. Copyright © 1998 by The McGraw-Hill Companies, Inc.) Source: Blood Disorders, Pathophysiology of Disease: An Introduction to Clinical Medicine, 7e Citation: Hammer GD, McPhee SJ. Pathophysiology of Disease: An Introduction to Clinical Medicine, 7e; 2013 Available at: https://accesspharmacy.mhmedical.com/DownloadImage.aspx?image=/data/Books/961/Ham007_Fig_06-08.png&sec=53628490&BookID=961&ChapterSecID=53555687&imagename= Accessed: December 26, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved

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