Send to

Choose Destination
J Pediatr Endocrinol Metab. 2018 Aug 28;31(8):861-868. doi: 10.1515/jpem-2017-0312.

Hereditary 1,25-dihydroxyvitamin D-resistant rickets (HVDRR): clinical heterogeneity and long-term efficacious management of eight patients from four unrelated Arab families with a loss of function VDR mutation.

Author information

Department of Pathology, Molecular Genetics Pathology Unit, College of Medicine, King Khalid University Hospital, King Saud University, Riyadh, Saudi Arabia.
Department of Pediatrics, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia.
Department of Pediatrics - MBC 58, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia.
Department of Pathology, College of Medicine, King Saud University, Riyadh, Saudi Arabia.
Department of Orthopedic, King Saud University, Riyadh, Saudi Arabia.
Genome Technologies, Ontario Institute for Cancer Research, Toronto, Canada.



Vitamin D regulates the concentrations of calcium and phosphate in blood and promotes the growth and remodeling of bones. The circulating active form of vitamin D, 1,25-dihydroxyvitamin D, binds to the vitamin D receptor (VDR), which heterodimerizes with the retinoid X receptor to regulate the expression of target genes. Inactivating mutations in the VDR gene cause hereditary vitamin D-resistant rickets (HVDRR), a rare disorder characterized by an early onset of rickets, growth retardation, skeletal deformities, hypocalcemia, hypophosphatemia and secondary hyperparathyroidism, and in some cases alopecia.


We describe eight new HVDRR patients from four unrelated consanguineous families. The VDR gene was sequenced to identify mutations. The management of patients over a period of up to 11 years following the initial diagnosis is assessed.


Although all patients exhibit main features of HVDRR and carry the same c.885C>A (p.Y295*) loss of function mutation in the VDR gene, there was heterogeneity of the manifestations of HVDRR-associated phenotypes and developmental milestones. These eight patients were successfully treated over a period of 11 years. All clinical symptoms were improved except alopecia.


The study concludes that VDR sequencing and laboratory tests are essential to confirm HVDRR and to assess the effectiveness of the treatment.


alopecia; growth retardation; hereditary 1,25-dihydroxyvitamin D-resistant rickets; treatment; vitamin D receptor mutation

[Indexed for MEDLINE]

Supplemental Content

Full text links

Icon for Sheridan PubFactory
Loading ...
Support Center