ArticleJournal of clinical laboratory analysis2024
Identification of a Novel Deletion Variant (c.2999_3005delTGTGTGT/p.Asn1000SerfsTer4) in NPHP4 Associated With Nephronophthisis-4.
Article in Journal of clinical laboratory analysis, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 3 papers.
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Who cites it
3 citing papers in PubMed.
- Detection of the NPHP4 c.2999_3005del (p.Asn1000SerfsTer4) variant in an Iranian family with nephronophthisis-4.Molecular genetics and genomics : MGG · 2026Article
- Response to the Letter to the Editor Entitled "From Variant of Unknown Significance to Likely Pathogenic: Adult-Onset - Nephronophthisis Linked to NPHP4 p.T680M".Kidney international reports · 2025Article
- Galloway-mowat syndrome 3 (GAMOS3): a novel disease-causing variant in OSGEP gene and expansion of the clinical spectrum.Neurological sciences : official journal of the Italian Neurological Society and of the Italian Society of Clinical Neurophysiology · 2025Article
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Authors and funding
11 authors.
Funding
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Abstract
backgroundNephronophthisis-4 (NPHP4) is an inherited renal ciliopathy described by renal fibrosis and progressive impairment of kidney function. This study aimed to investigate the genetic basis and clinical manifestations of NPHP4 in two Iranian siblings.
methodsThe proband was a 27-year-old male with features of end-stage renal disease, including anemia, uremia, polyuria, and polydipsia. It is worth mentioning that he has a 22-year-old sister with a similar presentation. Clinical diagnosis procedures, such as renal biopsy, brain imaging, blood and urine tests, cardiac evaluation, ophthalmic inspection, and auditory function assessment, were carried out to evaluate organ involvement and potential comorbidities. Whole-exome sequencing (WES) and segregation analysis were performed to identify and confirm genetic variants associated with the condition. Computational variant analysis was conducted to evaluate the pathogenicity of the candidate variant. Furthermore, the SWISS-MODEL server was utilized for protein modeling.
resultsThe brain, cardiac, ocular, and auditory functions were normal. Renal biopsy of the proband showed chronic interstitial inflammation and fibrosis. We found a novel homozygous 7-base pair deletion (c.2999_3005delTGTGTGT/ p.Asn1000SerfsTer4) in exon 21 of NPHP4 by WES. Segregation analysis confirmed homozygosity for the NPHP4 variant in affected individuals and heterozygous carrier status in parents, supporting autosomal recessive inheritance. 3D protein modeling indicated significant structural changes due to the variant.
conclusionThis study expands the genetic causes and phenotypic spectrum of nephronophthisis-4 and reveals the importance of genetic analysis in diagnosing and managing rare inherited kidney disorders, particularly those involving consanguinity.
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