In response to PTH infusion (6 units/kg over 4 hours) FHR subjects exhibited a mean 34% decrease in TRP and a 22-fold increase in cAMP excretion, both comparable to the control response.
In response to PTH infusion (6 units/kg over 4 hours) FHR subjects exhibited a mean 34% decrease in TRP and a 22-fold increase in cAMP excretion, both comparable to the control response.
In response to PTH infusion (6 units/kg over 4 hours) FHR subjects exhibited a mean 34% decrease in TRP and a 22-fold increase in cAMP excretion, both comparable to the control response.
We have localized the locus for the vitamin D receptor (VDR) responsible for hypocalcemic vitamin D-resistant rickets (HVDRR), close to the pseudovitamin D-deficient rickets (PDDR) locus, another disorder related to impaired vitamin D metabolism.
A unique mutation in the vitamin D receptor gene in three Japanese patients with vitamin D-dependent rickets type II: utility of single-strand conformation polymorphism analysis for heterozygous carrier detection.
A method for assay of 25-hydroxyvitamin D-24-hydroxylase (24-hydroxylase) activity in phytohemagglutinin (PHA)-stimulated lymphocytes was applied to determine whether vitamin D-dependent rickets type II (VDDR II) is hereditary.
Nevertheless, these results suggest that absolute PTH resistance is not a feature of X-linked hypophosphatemic ricket, although subtle forms of resistance at the level of the 25-hydroxyvitamin D 1 alpha-hydroxylase enzyme are not excluded by these data.
Vitamin D dependent rickets type II and normal vitamin D receptor cDNA sequence. A cluster in a rural area of Cauca, Colombia, with more than 200 affected children.
Two new mutations in the vitamin D receptor which cause hereditary vitamin D resistant rickets have been described and using molecular modelling we have been able to analyse the genesis of this inherited disease at the level of stereochemistry.
DNA polymorphism analysis of the Bc1I site of exons 17-18 of factor VIII gene of the woman and her last two fetuses seemed to be compatible with a linkage between the XLH locus and factor VIII gene.
We have identified and characterized two mutations in the hormone binding domain of the vitamin D receptor (VDR) in patients with hereditary vitamin D-resistant rickets.
New tools (molecular probes and antibodies) have allowed dissection out of some of the molecular and cellular mechanisms underlying the adaptation of phosphate transport to dietary content, the phosphaturic effect of parathyroid hormone or glucocorticoids and the renal phosphate leak in hypophosphataemic rickets.
We have examined the X inactivation pattern in peripheral blood cells from 12 females belonging to seven families with XLH using PCR analysis at the androgen receptor locus.
Two novel point mutations (I314S and R391C) identified in the hormone-binding domain of the human vitamin D receptor (VDR) from patients with hereditary hypocalcemic vitamin D-resistant rickets confer the receptor with sharply reduced 1,25-(OH)2D3-dependent transactivation.
That all three classes of VDR mutations generate the HVDRR phenotype is consistent with a basic model of the active receptor as a DNA-bound, 1,25(OH)2D3-liganded heterodimer of VDR and RXR.
In conclusion, the Arg30stop mutation truncates the VDR and leads to a hormone-resistant condition which is the molecular basis of HVDRR in this patient.
PHEX mutations have been observed in XLH patients, and we have undertaken studies to characterize such mutations in 46 unrelated XLH kindreds and 22 unrelated patients with nonfamilial XLH by single stranded conformational polymorphism and DNA sequence analysis.