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Identification of a novel PHEX mutation in a Chinese family with X-linked hypophosphatemic rickets using exome
Insights
Researchers identified a new PHEX gene mutation causing familial hypophosphatemic rickets (HR) in a Chinese family. This discovery advances understanding of HR genetics and aids diagnosis and counseling.
Area of Science:
- Genetics
- Molecular Biology
- Pediatrics
Background:
- Familial hypophosphatemic rickets (HR) is the most common inherited disorder of phosphate metabolism.
- Characterized by bone deformities, growth retardation, and hypophosphatemia, HR presents significant clinical challenges.
- Genetic and clinical heterogeneity complicates the diagnosis and management of HR.
Purpose of the Study:
- To identify the specific genetic mutation underlying familial HR in a multi-generational Chinese Han pedigree.
- To elucidate the molecular basis of HR in this cohort.
- To evaluate the utility of exome sequencing in diagnosing HR.
Main Methods:
- Exome sequencing and Sanger sequencing were employed to analyze the genetic makeup of the affected family.
- Clinical data, including skeletal, dental, and auditory features, were correlated with genetic findings.
- Functional prediction of the identified mutation was performed.
Main Results:
- A novel deletion mutation, c.1553delT (p.F518Sfs*4), was discovered in the phosphate regulating endopeptidase homolog (PHEX) gene.
- This mutation is predicted to lead to a truncated, non-functional PHEX protein.
- Clinical manifestations in the family included skeletal deformities, dental abnormalities, and hearing impairments.
Conclusions:
- Exome sequencing is a highly effective method for identifying causative mutations in genetically heterogeneous disorders like HR.
- The identified PHEX mutation provides new insights into the pathogenesis of familial hypophosphatemic rickets.
- These findings have significant implications for genetic counseling, diagnosis, and clinical management of HR patients.
Abstract:
Familial hypophosphatemic rickets (HR), the most common inherited form of rickets, is a group of inherited renal phosphate wasting disorders characterized by growth retardation, rickets with bone deformities, osteomalacia, poor dental development, and hypophosphatemia. The purpose of this study was to identify the genetic defect responsible for familial HR in a four-generation Chinese Han pedigree by exome sequencing and Sanger sequencing. Clinical features include skeletal deformities, teeth abnormalities, hearing impairments and variable serum phosphate level in patients of this family. A novel deletion mutation, c.1553delT (p.F518Sfs*4), was identified in the X-linked phosphate regulating endopeptidase homolog gene (PHEX). The mutation is predicted to result in prematurely truncated and loss-of-function PHEX protein. Our data suggest that exome sequencing is a powerful tool to discover mutation(s) in HR, a disorder with genetic and clinical heterogeneity. The findings may also provide new insights into the cause and diagnosis of HR, and have implications for genetic counseling and clinical management.
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