Confirmation of association between multiple sclerosis and CYP27B1.

European Journal of Human Genetics : EJHG
Emilie SundqvistIngrid Kockum

Abstract

Multiple sclerosis, MS (OMIM No. 126200), is a complex inflammatory disease that is characterized by lesions in the central nervous system. Both genes and other environmental factors influence disease susceptibility. One of the environmental factors that has been implicated in MS and autoimmune disease, such as type 1 diabetes, is vitamin D deficiency, in which patients have lower levels of 25-hydroxyvitamin D3 (25-OHD(3)) in blood than do controls. Previtamin D(3) is produced in the skin, and turned into 25-OHD(3) in the liver. In the kidney, skin and immune cells, 25-OHD(3) is turned into bioactive 1,25(OH)(2)D(3) by the enzyme coded by CYP27B1 (cytochrome P450 family 27 subfamily B peptide 1) on chromosome 12q13.1-3. 1,25(OH)(2)D(3) binds to the vitamin D receptor, expressed in T cells and antigen-presenting cells. 1,25(OH)(2)D(3) has a suppressive role in the adaptive immune system, decreasing T-cell and dendritic cell maturation, proliferation and differentiation, shifting the balance between T-helper 1 (Th1) and Th2 cells in favor of Th2 cells and increasing the suppressive function of regulatory T cells. Rs703842 in the 12q13-14 region was associated with MS in a recent study by the Australian and New Zealand Multiple Sc...Continue Reading

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