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PubMed This is a summary of 20 peer-reviewed journal articles Updated
Nephrology · Steroid-Resistant Nephrotic Syndrome

The Blueprint and the Filter: Why Genetics Matter

At a Glance

Genetic testing is central to steroid-resistant nephrotic syndrome care because it can identify inherited kidney-filter problems, guide medication decisions, clarify transplant recurrence risk, and inform counseling for relatives and future children.

To understand why your kidneys are leaking protein, we have to look at the microscopic filters of the kidney. At the heart of these filters are specialized cells called podocytes. When you have Steroid-Resistant Nephrotic Syndrome (SRNS), these podocytes are structurally impaired or damaged [1][2].

Scientists now broadly investigate SRNS by looking for underlying causes, which include monogenic (genetic), secondary, and presumed primary/idiopathic (often suspected to be immune-mediated, though the exact mechanisms are complex) [3].

The Podocyte: The Kidney’s Master Filter

Think of your kidney filters like a very fine mesh screen. The podocytes are cells with long, finger-like “foot processes” that wrap around the blood vessels in the kidney. Between these fingers is a structure called the slit diaphragm [1].

In healthy kidneys, this mesh is so tight that it keeps large proteins (like albumin) in your blood while letting waste products pass through into the urine [1]. In SRNS, the podocytes lose their shape and pull away from the filter—a process called effacement [2]. This creates gaps in the mesh, allowing protein to spill into the urine [4].

Monogenic SRNS: The ‘Blueprint’ Error

In monogenic SRNS, the “blueprint” for building or maintaining the podocyte is flawed. This means a single mutation in a specific gene is responsible for the disease.

  • How common is it? In children, roughly 20% to 30% of SRNS cases are found to be monogenic [5][6]. The younger a child is when diagnosed, the more likely it is to be genetic. For example, in infants under one year old, the genetic cause can be found in 40% to 66% of cases [5][7].
  • Key Genes:
    • NPHS1 & NPHS2: These genes provide instructions for building the slit diaphragm. Mutations here are very common in early-onset cases [8][9].
    • WT1: This gene is a “master switch” for kidney development. Mutations can sometimes be associated with other symptoms outside the kidney [10].
    • COQ6 & ADCK4: These involve the cell’s energy centers (mitochondria). These are rare but important because some patients may benefit from specific supplements like Coenzyme Q10 under specialist guidance [11][12].

Presumed Primary SRNS: The Immune-Mediated Suspect

If genetic testing does not find a mutation, the condition is often considered presumed primary/idiopathic. A negative panel does not strictly prove the disease is immune-mediated; it may reflect incomplete testing, a “Variant of Uncertain Significance” (VUS), or a secondary form of the disease [3]. However, in many presumed primary cases, doctors suspect that a “circulating factor” in the blood or an immune system dysregulation is damaging the podocytes [13].

Why Genetic Testing Is Absolutely Crucial

Genetic testing is no longer just “extra” information; it is a critical tool for planning your care. Knowing if the disease is monogenic changes three major things:

  1. Medication Decisions: Monogenic SRNS usually does not respond to intensive immune-suppressing drugs [14]. If a genetic cause is found, your doctor may formulate a plan to taper high-dose medications to avoid unnecessary side effects [15]. Never stop or abruptly taper steroids or other immunosuppressants on your own; this must be carefully managed by your care team.
  2. Transplant Planning: This is perhaps the most vital piece of information. If the cause is presumed primary/immune-mediated, there is a higher risk that the underlying factors will attack a newly transplanted kidney [16]. If the cause is monogenic, the risk of the disease returning in a new kidney is generally very low because the new kidney comes with its own healthy “blueprints” [14][17].
  3. Family Guidance: Testing, alongside genetic counseling, can identify if other family members are at risk or if there are implications for future children [18].

Because of these high stakes, current guidelines recommend offering genetic testing to all children with SRNS and many adults, especially those with early-onset or familial disease [19][20]. Finding an answer—even if it is a genetic one—helps your team stop guessing and start targeting the right path for you.

Common questions in this guide

What can cause steroid-resistant nephrotic syndrome?
Steroid-resistant nephrotic syndrome can result from a single gene change that affects the kidney’s filtering cells, a presumed primary process that may involve the immune system, or a secondary cause. Finding no gene change does not by itself prove that the condition is immune-mediated.
Why is genetic testing recommended for SRNS?
Genetic testing can show whether a gene change is contributing to SRNS and help guide medicines, transplant planning, and family counseling. It is especially important when SRNS starts early, affects several relatives, or occurs in a child, and it is recommended for all children and many adults with SRNS.
Does a negative SRNS genetic test rule out a genetic cause?
No. A negative result can reflect limits of the test, a genetic change that was not included or detected, a change whose meaning is unclear, or a secondary cause; it does not prove that SRNS is immune-mediated. Your nephrology and genetics team can decide whether additional testing or evaluation is appropriate.
Can genetic results change my SRNS medications?
Yes. SRNS caused by a single gene change often does not improve with intensive immune-suppressing medicines, so the care team may reconsider high-dose treatment and reduce side effects. Never stop or rapidly lower steroids or other immune-suppressing medicines without medical supervision.
Does genetic SRNS come back after a kidney transplant?
SRNS caused by a gene change generally has a very low chance of returning in a transplanted kidney because the donated kidney has its own healthy genetic instructions. Presumed primary or immune-mediated SRNS has a higher recurrence risk, so transplant planning depends on the cause and the individual.
What does a genetic diagnosis mean for my family?
It may show that relatives have an increased chance of kidney disease or that future children could be affected, depending on the gene and inheritance pattern. A genetic counselor can explain who might benefit from testing and help you decide how to use the information.

Questions For You

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Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.What is the likelihood that the SRNS is monogenic versus primary/idiopathic?
  2. 2.Which specific genetic testing panel are you recommending, and does it include copy-number variant detection to look for missing or extra pieces of genetic material?
  3. 3.If a genetic mutation is found, how will it change the medications we are currently using?
  4. 4.If the genetic test comes back negative, what are the next steps to rule out other secondary causes?
  5. 5.How does our genetic status affect the risk of the disease coming back if a kidney transplant is needed in the future?

References

References (20)
  1. 1

    Structural and functional insights of the podocyte slit diaphragm complex.

    Qadri AH, Prajapati J, Praghna D, et al.

    Tissue barriers 2026; (14(2)):2575198 doi:10.1080/21688370.2025.2575198.

    PMID: 41100809
  2. 2

    A critical role of the podocyte cytoskeleton in the pathogenesis of glomerular proteinuria and autoimmune podocytopathies.

    Ye Q, Lan B, Liu H, et al.

    Acta physiologica (Oxford, England) 2022; (235(4)):e13850 doi:10.1111/apha.13850.

    PMID: 35716094
  3. 3

    Molecular stratification of idiopathic nephrotic syndrome.

    Saleem MA

    Nature reviews. Nephrology 2019; (15(12)):750-765 doi:10.1038/s41581-019-0217-5.

    PMID: 31654044
  4. 4

    KANK deficiency leads to podocyte dysfunction and nephrotic syndrome.

    Gee HY, Zhang F, Ashraf S, et al.

    The Journal of clinical investigation 2015; (125(6)):2375-84.

    PMID: 25961457
  5. 5

    Spectrum of steroid-resistant and congenital nephrotic syndrome in children: the PodoNet registry cohort.

    Trautmann A, Bodria M, Ozaltin F, et al.

    Clinical journal of the American Society of Nephrology : CJASN 2015; (10(4)):592-600 doi:10.2215/CJN.06260614.

    PMID: 25635037
  6. 6

    Comparison of different genetic testing modalities applied in paediatric patients with steroid-resistant nephrotic syndrome.

    Cheng X, Chen J, Yang X, et al.

    Italian journal of pediatrics 2024; (50(1)):85 doi:10.1186/s13052-024-01655-4.

    PMID: 38654395
  7. 7

    Whole Exome Sequencing of Patients with Steroid-Resistant Nephrotic Syndrome.

    Warejko JK, Tan W, Daga A, et al.

    Clinical journal of the American Society of Nephrology : CJASN 2018; (13(1)):53-62 doi:10.2215/CJN.04120417.

    PMID: 29127259
  8. 8

    Next-Generation Sequencing for Congenital Nephrotic Syndrome: A Multi-Center Cross-Sectional Study from India.

    Joshi A, Sinha A, Sharma A, et al.

    Indian pediatrics 2021; (58(5)):445-451.

    PMID: 33980730
  9. 9

    Variability in phenotype induced by the podocin variant R229Q plus a single pathogenic mutation.

    Phelan PJ, Hall G, Wigfall D, et al.

    Clinical kidney journal 2015; (8(5)):538-42 doi:10.1093/ckj/sfv063.

    PMID: 26413278
  10. 10

    Genotype-phenotype analysis of pediatric patients with WT1 glomerulopathy.

    Ahn YH, Park EJ, Kang HG, et al.

    Pediatric nephrology (Berlin, Germany) 2017; (32(1)):81-89 doi:10.1007/s00467-016-3395-4.

    PMID: 27300205
  11. 11

    Variation of the clinical spectrum and genotype-phenotype associations in Coenzyme Q10 deficiency associated glomerulopathy.

    Drovandi S, Lipska-Ziętkiewicz BS, Ozaltin F, et al.

    Kidney international 2022; (102(3)):592-603 doi:10.1016/j.kint.2022.02.040.

    PMID: 35483523
  12. 12

    Focal segmental glomerulosclerosis and medullary nephrocalcinosis in children with ADCK4 mutations.

    Park E, Kang HG, Choi YH, et al.

    Pediatric nephrology (Berlin, Germany) 2017; (32(9)):1547-1554 doi:10.1007/s00467-017-3657-9.

    PMID: 28405841
  13. 13

    Autoantibodies Targeting Nephrin in Podocytopathies.

    Hengel FE, Dehde S, Lassé M, et al.

    The New England journal of medicine 2024; (391(5)):422-433 doi:10.1056/NEJMoa2314471.

    PMID: 38804512
  14. 14

    Response to First Course of Intensified Immunosuppression in Genetically Stratified Steroid Resistant Nephrotic Syndrome.

    Mason AE, Sen ES, Bierzynska A, et al.

    Clinical journal of the American Society of Nephrology : CJASN 2020; (15(7)):983-994 doi:10.2215/CJN.13371019.

    PMID: 32317330
  15. 15

    Consensus Guidelines on Management of Steroid-Resistant Nephrotic Syndrome.

    Vasudevan A, Thergaonkar R, Mantan M, et al.

    Indian pediatrics 2021; (58(7)):650-666.

    PMID: 33408286
  16. 16

    A Systematic Review and Meta-Analysis of the Rate and Risk Factors for Post-transplant Disease Recurrence in Children With Steroid Resistant Nephrotic Syndrome.

    Morello W, Proverbio E, Puccio G, Montini G

    Kidney international reports 2023; (8(2)):254-264 doi:10.1016/j.ekir.2022.10.030.

    PMID: 36815113
  17. 17

    Post-transplant recurrence of steroid resistant nephrotic syndrome in children: the Italian experience.

    Morello W, Puvinathan S, Puccio G, et al.

    Journal of nephrology 2020; (33(4)):849-857 doi:10.1007/s40620-019-00660-9.

    PMID: 31617157
  18. 18

    Genetic testing in steroid-resistant nephrotic syndrome: why, who, when and how?

    Preston R, Stuart HM, Lennon R

    Pediatric nephrology (Berlin, Germany) 2019; (34(2)):195-210 doi:10.1007/s00467-017-3838-6.

    PMID: 29181713
  19. 19

    Genetic tests in children with steroid-resistant nephrotic syndrome.

    Cheong HI

    Kidney research and clinical practice 2020; (39(1)):7-16 doi:10.23876/j.krcp.20.001.

    PMID: 32155690
  20. 20

    Identification of disease-causing variants by comprehensive genetic testing with exome sequencing in adults with suspicion of hereditary FSGS.

    Braunisch MC, Riedhammer KM, Herr PM, et al.

    European journal of human genetics : EJHG 2021; (29(2)):262-270 doi:10.1038/s41431-020-00719-3.

    PMID: 32887937

This page explains the role of genetic testing in steroid-resistant nephrotic syndrome for informational purposes only and does not constitute medical advice. Discuss test selection, medication changes, and transplant planning with your nephrology and genetics team.