Steroid Resistant Nephrotic Syndrome-Genetic Consideration.

Area of Science:

• Nephrology
• Genetics
• Pediatrics

Background:

• Steroid-resistant nephrotic syndrome (SRNS) is a severe kidney disorder often leading to end-stage renal failure, particularly in children and young adults.
• The underlying causes of SRNS have been largely unknown, hindering effective treatment and management strategies.
• Hereditary forms of SRNS may have a lower risk of recurrence after kidney transplantation.

Purpose of the Study:

• To investigate the genetic basis of SRNS using advanced diagnostic techniques.
• To identify specific gene mutations responsible for SRNS in a large international cohort.
• To explore the therapeutic implications of genetic findings in SRNS patients.

Main Methods:

• Utilized next-generation sequencing to analyze a comprehensive panel of 27 SRNS-associated genes (21 recessive, 6 dominant).
• Tested a large international cohort of 1783 families with SRNS manifesting before 25 years of age.
• Correlated identified mutations with clinical presentation and potential treatment responses.

Main Results:

• A single-gene cause was identified in 29.5% (526/1783) of families with SRNS.
• Recessive mutations in NPHS1, NPHS2, LAMB2, or WT1 explained a high percentage of early-onset SRNS.
• Identified mutations in COQ2, COQ6, ADCK4, PDSS2, PLCE1, and CUBN suggest specific therapeutic avenues.

Conclusions:

• Genetic testing is crucial for diagnosing SRNS, revealing a significant genetic etiology.
• Identification of causative mutations enables personalized treatment strategies, such as coenzyme Q10 or vitamin B12 supplementation.
• Genetic findings are vital for accurate familial genetic counseling and prenatal diagnosis in SRNS.