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Related Experiment Videos

Vitamin D-dependent rickets type I and type II

E Takeda1, H Yamamoto, Y Taketani

  • 1Department of Clinical Nutrition, School of Medicine, University of Tokushima, Japan.

Acta Paediatrica Japonica : Overseas Edition
|August 1, 1997
PubMed
Summary

Vitamin D-dependent rickets types I and II are distinct genetic disorders affecting vitamin D metabolism. Type I involves a renal enzyme deficiency, while Type II features vitamin D receptor defects, requiring different treatment approaches.

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Area of Science:

  • Endocrinology
  • Genetics
  • Metabolic Disorders

Background:

  • Two primary hereditary forms of vitamin D metabolism defects exist: vitamin D-dependent rickets type I (VDDR I) and type II (VDDR II).
  • VDDR I is linked to a deficiency in the renal enzyme 25-hydroxyvitamin D-1 alpha-hydroxylase.
  • VDDR II is characterized by defects in the intracellular vitamin D receptor (VDR), often due to VDR gene mutations.

Purpose of the Study:

  • To differentiate between VDDR I and VDDR II based on their underlying mechanisms and clinical presentations.
  • To outline the distinct therapeutic strategies required for each type of vitamin D-dependent rickets.

Main Methods:

  • Clinical observation and biochemical analysis of patients with rickets.
  • Genetic analysis to identify mutations in the VDR gene for VDDR II.

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  • Assessment of response to different vitamin D metabolites and analogs.

    • Main Results:

    • VDDR I presents with muscle weakness and rickets, responsive to normal doses of 1 alpha-hydroxyvitamin D3 or 1,25-dihydroxyvitamin D3.
    • VDDR II is marked by early-onset severe rickets and alopecia, necessitating high-dose vitamin D analogs and calcium supplementation.
    • Treatment response in VDDR II can be variable.

    Conclusions:

    • VDDR I and VDDR II represent distinct genetic defects in vitamin D metabolism with differing clinical courses and treatment requirements.
    • Accurate diagnosis is crucial for effective management of these rare rickets types.