Background Pseudovitamin Ddeficiency rickets is characterizedby the early onset of rickets with hypocalcemia and is thoughtto be caused by a deficit in renal 25-hydroxyvitamin D3 1-hydroxylase,the key enzyme for the synthesis of 1,25-dihydroxyvitamin D3.
Methods We cloned human 25-hydroxyvitamin D3 1-hydroxylase complementaryDNA (cDNA) using a mouse 1-hydroxylase cDNA fragment as a probe.Its genomic structure was determined, and its chromosomal locationwas mapped by fluorescence in situ hybridization. We then identifiedmutations in the 1-hydroxylase gene in four unrelated patientswith pseudovitamin Ddeficiency rickets by DNA-sequenceanalysis. Both the normal and the mutant 1-hydroxylase proteinswere expressed in COS-1 cells and were assayed for 1-hydroxylaseactivity.
Results The gene for 25-hydroxyvitamin D3 1-hydroxylase wasmapped to chromosome 12q13.3, which had previously been reportedto be the locus for pseudovitamin Ddeficiency ricketsby linkage analysis. Four different homozygous missense mutationswere detected in this gene in the four patients with pseudovitaminDdeficiency rickets. The unaffected parents and one siblingtested were heterozygous for the mutations. Functional analysisof the mutant 1-hydroxylase protein revealed that all four mutationsabolished 1-hydroxylase activity.
Conclusions Inactivating mutations in the 25-hydroxyvitaminD3 1-hydroxylase gene are a cause of pseudovitamin Ddeficiencyrickets.
Source Information
From the Institute of Molecular and Cellular Biosciences, University of Tokyo, Tokyo (S. Kitanaka, K.T., A.M., T.S., J.Y., S. Kato); Core Research for Evolutional Science and Technology, Japan Science and Technology Corporation, Saitama (S. Kato); the Faculty of Bioresources, Mie University, Mie (K.O., M.N.); Tokyo Metropolitan Kiyose Children's Hospital, Tokyo (Y.H.); the Department of Pediatrics, Chiba University School of Medicine, Chiba (H.N.); and the Department of Endocrinology and Metabolism, National Children's Medical Research Center, Tokyo (T.T.) all in Japan.
Address reprint requests to Dr. Kato at the Institute of Molecular and Cellular Biosciences, University of Tokyo, Yayoi, Bunkyo-ku, Tokyo 113-0032, Japan.
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