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- W2086724871 abstract "Vitamin D-dependent rickets type 1A (VDDR-IA, OMIM 264700) is a rare autosomal recessive disorder and is caused by mutations in the CYP27B1 gene.We aim to investigate CYP27B1 mutation in seven patients from four separate families and characterize the genotype-phenotype correlation.The entire coding region of the CYP27B1 gene was sequenced, and genotype-phenotype correlation among patients was assessed.Sequencing analysis identified biallelic CYP27B1 mutations in all patients and monoallelic mutations in their parents. One patient from the first family was compound heterozygous for c.1166G>A (p.Arg389His) and a novel nonsense mutation c.1079 C>A (p.Ser360*). Two patients from the second family were homozygous for a novel splice donor site mutation in intron 1 (c.195 + 2 T>G), causing partial retention of the intron and a shift in the reading frame. Both novel mutations lead to the complete loss of vitamin D1α-hydroxylase activity. Four patients from families 3 and 4 were homozygous for a previously reported duplication mutation in exon 8 (1319-1325dupCCCACCC, Phe443Profs*24). Interestingly, one patient who was presented with severe hypocalcaemia and seizures at 4 months of age as a result of Phe443Profs*24 has improved spontaneously since 11 years of age and does not need regular treatment. Her laboratory tests showed normal serum calcium and 1,25(OH)(2) D after refusing to take medication for 12 months.There is a good genotype-phenotype correlation in VDDR-IA. However, some patients may recover from the loss of CYP27B1 function, probably due to 1α-hydroxylase activity exerted by a non-CYP27B1 enzyme." @default.
- W2086724871 created "2016-06-24" @default.
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- W2086724871 date "2012-08-14" @default.
- W2086724871 modified "2023-10-16" @default.
- W2086724871 title "Clinical and genetic analysis of patients with vitamin D-dependent rickets type 1A" @default.
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- W2086724871 doi "https://doi.org/10.1111/j.1365-2265.2012.04394.x" @default.
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