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[Clinical feature and variant analysis of a case with hereditary hypophosphatemic rickets with hypercalciuria]

Libing Liu¹, Xiaojie Gao, Yijiao Ma

¹Department of Nephrology, Shenzhen Children's Hospital, Shenzhen, Guangdong 518000, China. gxj0824@hotmail.com.

Zhonghua Yi Xue Yi Chuan Xue Za Zhi = Zhonghua Yixue Yichuanxue Zazhi = Chinese Journal of Medical Genetics

|May 31, 2020

Abstract

Objective:

To explore the clinical features and genetic basis for a patient with hereditary hypophosphatemic rickets with hypercalciuria(HHRH).

Methods:

Clinical data of the patient was collected. The patient was subjected to whole exome capture and next generation sequencing (NGS). Suspected variants were verified by Sanger sequencing.

Results:

The patient presented with hypophosphatemic rickets, short stature, hypercalciuria, and renal stones. NGS showed that he has carried compound heterozygous variants of the SLC34A3 gene, namely c.532_533delCA(p.Q178Vfs*6) and c.894_925+69del(splicing). His parents were asymptomatic heterozygous carriers of one of the variants. Based on ACMG guidelines, both variants were classified as pathogenic.

Conclusion:

The compound heterozygous variants c.532_533delCA (p.Q178Vfs*6) and c.894_925+69del(splicing) of the SLC34A3 gene probably underlie the disease in this child. Above finding has enriched the variant spectrum for HHRH. Based on the results, prenatal diagnosis may be provided for the family.

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