Defective CYP27B1 causes Rickets vitamin D-dependent 1A (VDDR1A)

Stable Identifier
R-HSA-5579014
Type
Pathway
Species
Homo sapiens
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Vitamin D3 (cholecalciferol), synthesised in human skin by ultraviolet radiation action on 7-dehydrocholesterol, does not possess any biological activity. Vitamin D hormonal activity requires hydroxylation at the 25 and 1-alpha positions by cytochrome P450 enzymes CYP2R1 and CYP27B1 respectively. Vitamin D 25-hydroxylase (CYP2R1) catalyses the hydroxylation of vitamin D3 to calcidiol (CDL). Subsequent 1-alpha-hydroxylation of CDL by CYP27B1 produces calcitriol (CTL). CTL binds and activates the nuclear vitamin D receptor, with subsequent regulation of physiologic events such as calcium homeostasis, cellular differentiation and proliferation.

Defects in CYP27B1 can cause rickets, vitamin D-dependent 1A (VDDR1A; MIM:264700), a disorder caused by deficiency of the active form of vitamin D (CTL) resulting in defective bone mineralization and clinical features of rickets. To date, 47 mutations have been identified, the majority of them (28) being missense mutations (Kim 2011, Cui et al. 2012).

Literature References
PubMed ID Title Journal Year
21503197 Vitamin D dependent rickets type I

Kim, CJ

Korean J Pediatr 2011
22588163 Novel mutations of CYP27B1 gene lead to reduced activity of 1?-hydroxylase in Chinese patients

Cui, N, Xia, W, Su, H, Pang, L, Jiang, Y, Sun, Y, Nie, M, Xing, X, Li, M, Wang, O, Yuan, T, Chi, Y, Hu, Y, Liu, H, Meng, X, Zhou, X

Bone 2012
Participants
Participant Of
Disease
Name Identifier Synonyms
rickets 10609 vitamin D-dependent rickets, active rickets, Rickets, active
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