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A new metabolic path in type 3 rickets.

Toshiya Senda1, Yoshihisa Hirota2

  • 1Structural Biology Research Center, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Tsukuba, Japan.

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|December 30, 2025
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Summary

Newly identified type 3 rickets involves a gain-of-function mutation in CYP3A4, leading to an inactive vitamin D metabolite and insufficient active vitamin D levels. This discovery offers a new research direction for rickets.

Keywords:
11α,25‐dihydroxyvitamin D3 [11α,25(OH)2D3]CYP3A4(I301T)cytochrome P450dependent ricketsgain‐of‐function mutationtype 3 ricketsvitamin Dvitamin D inactivation/C‐11 hydroxylation

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Area of Science:

  • Biochemistry
  • Genetics
  • Endocrinology

Background:

  • Rickets, a bone disorder, was historically linked to vitamin D deficiency.
  • Genetic mutations affecting vitamin D activation or mineral metabolism cause various rickets forms.
  • Recent research identified a novel genetic cause of rickets.

Purpose of the Study:

  • To describe a newly identified genetic form of rickets.
  • To elucidate the molecular mechanism behind this new rickets type.
  • To introduce a novel gain-of-function mutation in CYP3A4 as a cause of rickets.

Main Methods:

  • Genetic sequencing to identify mutations.
  • Enzyme activity assays to study vitamin D metabolism.
  • Metabolite analysis to identify vitamin D products.

Main Results:

  • A gain-of-function mutation (Ile301Thr) in the CYP3A4 gene was identified as the cause of type 3 rickets.
  • The mutant CYP3A4 enzyme produces an inactive vitamin D metabolite, 11α,25(OH)2D3.
  • This results in a deficiency of the active form of vitamin D.

Conclusions:

  • Type 3 rickets is caused by a unique gain-of-function mutation in CYP3A4.
  • The discovery of this mechanism and metabolite provides new insights into rickets.
  • This finding opens new avenues for rickets research and potential therapeutic strategies.