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A novel PHEX mutation associated with vitamin D-resistant rickets
Saori Sako1, Yo Niida2, Kosuke Robert Shima1
11Department of Endocrinology and Metabolism, Kanazawa University Graduate School of Medical Sciences, 13-1 Takara-machi, Kanazawa, Ishikawa 920-8640 Japan.
Human Genome Variation
|February 23, 2019
Summary
X-linked hypophosphatemic rickets (XLH) is a common inherited bone disorder. This study identifies a novel mutation in the PHEX gene associated with XLH, potentially altering protein structure and function.
Area of Science:
- Genetics
- Molecular Biology
- Biochemistry
Background:
- X-linked hypophosphatemic rickets (XLH) is the most prevalent inherited form of rickets, characterized by phosphate wasting.
- The phosphate-regulating gene with homologies to endopeptidases on the X chromosome (PHEX) is implicated in XLH pathogenesis.
Observation:
- A case of XLH was investigated, focusing on genetic analysis of the PHEX gene.
- The study utilized PCR-direct sequencing to identify mutations within the PHEX gene.
Findings:
- A novel mutation, c.2202del [p.Asn736Ilefs*4], was discovered in exon 22 of the PHEX gene.
- This mutation is located near the 3'-UTR, affecting the COOH-terminal extracellular domain of the PHEX protein.
- In silico analysis suggests this mutation significantly alters protein structure and function.
Implications:
- Identification of novel PHEX mutations deepens the understanding of XLH genetic underpinnings.
- This finding may contribute to improved diagnostic strategies for XLH.
- Understanding the structural impact of mutations can inform future therapeutic approaches for phosphate metabolism disorders.
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