Experimental Nephrology and Genetics: Case Study of Genetic Interest

Zhang X.a,b,c· Zhi X.d· Wang X.a,e· Dong Y.d· Shu J.a,b,c· Wang W.a,e· Cai C.a,b,c

Author affiliations

aTianjin Children’s Hospital (Children’s Hospital of Tianjin University), Tianjin, China
bTianjin Pediatric Research Institute, Tianjin, China
cTianjin Key Laboratory of Birth Defects for Prevention and Treatment, Tianjin, China
dGraduate College, Tianjin Medical University, Tianjin, China
eDepartment of Nephrology, Tianjin Children’s Hospital, Tianjin, China

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Article / Publication Details

Received: July 31, 2022
Accepted: January 02, 2023
Published online: March 06, 2023

Number of Print Pages: 10
Number of Figures: 4
Number of Tables: 2

ISSN: 1660-8151 (Print)
eISSN: 2235-3186 (Online)

For additional information: https://www.karger.com/NEF

Abstract

Nephronophthisis is an autosomal recessive cystic kidney disease characterized by tubular injury and commonly results in kidney failure. We reported a case of 4-year-old Chinese boy presented with severe anemia, kidney, and liver dysfunction. Whole exome sequencing (WES) was performed to identify the candidate variant with a negative result initially. After complete collection of clinical information, reanalysis of WES identified a homozygous NPHP3 variant c.3813-3A>G (NM_153240.4). The effect on mRNA splicing of the intronic variant was predicted through software (three in silico splice tools). Furthermore, in vitro minigene assay was conducted to validate the predicted deleterious effects of the intronic variant. All of the splice prediction programs and minigene assay indicated that the variant had an impact on the normal splicing pattern of NPHP3. Our study confirmed the effect of the c.3813-3A>G variant on NPHP3 splicing in vitro, which gives additional evidence for the clinical significance of the variant and provides a basis for genetic diagnosis of nephronophthisis 3. In addition, we think that it is essential to reanalyze WES data after the complete clinical information collection to avoid missing some important candidate variants.

© 2023 S. Karger AG, Basel

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Received: July 31, 2022
Accepted: January 02, 2023
Published online: March 06, 2023

Number of Print Pages: 10
Number of Figures: 4
Number of Tables: 2

ISSN: 1660-8151 (Print)
eISSN: 2235-3186 (Online)

For additional information: https://www.karger.com/NEF

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