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A familial case of severe infantile nephronophthisis explained by oligogenic inheritance
Valentin Penchev1, Anelia Boueva2, Kunka Kamenarova1
1Molecular Medicine Center, Department of Medical Chemistry and Biochemistry, Medical University of Sofia, Sofia 1463, Bulgaria.
Insights
Severe kidney cysts in a family were linked to multiple mutations in nephronophthisis (NPHP) genes. This suggests complex genetic interactions contribute to renal cystic diseases.
Area of Science:
- Genetics
- Nephrology
- Developmental Biology
Background:
- Renal cystic diseases are common congenital malformations, often leading to chronic kidney disease or end-stage renal disease (ESRD).
- Over 70 genes are implicated in renal cyst pathology, with many involved in cilia function (ciliopathies) or crucial developmental transcription factors.
Observation:
- A systematic genetic approach was used to investigate a severe familial renal cystic disease.
- High-throughput mutation screening was performed on parents and an affected child.
Findings:
- The affected child inherited three deleterious mutations in two key nephronophthisis genes: NPHP3 and NPHP4.
- This finding points to a complex genetic etiology for the severe phenotype.
Implications:
- The study highlights the potential for epistatic interactions between NPHP mutations to cause severe renal cystic disease.
- Inherited genetic variants may also modify disease severity, underscoring the complexity of genetic contributions to kidney disorders.
Abstract:
Renal cysts are common malformation during the prenatal and postnatal period and frequent cause of chronic kidney or ESRD. More than 70 genes have been shown to play role in their pathology. Part of them are responsible for the structure and function of the cilia, which assigns a large proportion of the renal cystic diseases in the ciliopathies. Another group of genes responsible for cystic kidneys encodes transcription factors with crucial role during organogenesis. We describe here a systematic approach for identifying the genetic cause(s) of an unusually severe form of renal cystic disease in a family with multiple affected siblings. High throughput mutations screening of the parents and one of the children was applied for identifying the genetic causes of the disease. The affected child was found to have inherited 3 deleterious mutations in two nephronophthisis genes, NPHP3 and NPHP4. The possibility for epistatic interaction of the NPHP mutations as well as the modifying effect of other inherited genetic variants is discussed.