Yes, there are genetic forms of nephrotic syndrome, although they are relatively rare compared to other types. These forms occur when a specific mutation or ‘fault’ in a person’s DNA affects the structure and function of the podocytes—the specialised cells that make up the kidney’s filtration barrier. Genetic nephrotic syndrome is most frequently identified in infants and young children, where it often presents as ‘steroid-resistant’ disease.
In the UK, genetic testing is increasingly used within the NHS to identify these hereditary forms, especially when a patient does not respond to standard treatments or has a family history of kidney disease. Understanding the genetic basis of the condition is vital because genetic forms typically do not respond to traditional steroid therapy. Identifying a specific mutation helps clinicians tailor treatment plans, avoid unnecessary medications with heavy side effects, and provide accurate information to families regarding the risk of the condition affecting future children.
What We’ll Discuss in This Article
- The role of podocytes and how genetic mutations cause protein leaks.
- Common genetic types, including Congenital Nephrotic Syndrome (Finnish type).
- The difference between autosomal dominant and recessive inheritance patterns.
- Why genetic forms are often ‘steroid-resistant’.
- When UK doctors recommend genetic testing for patients.
- The impact of genetics on the success of kidney transplants.
How genetics affect the kidney’s filters
To understand genetic nephrotic syndrome, it helps to look at the ‘podocytes’. These are finger-like cells that wrap around the small blood vessels (glomeruli) in the kidneys. They create a fine mesh that lets waste products pass into the urine while keeping essential proteins in the blood.
In genetic forms of the syndrome, mutations in specific genes such as NPHS1, NPHS2, or WT1 cause these podocytes to develop incorrectly or fail prematurely. When the ‘mesh’ is faulty from birth due to DNA instructions, the kidneys begin to leak protein almost immediately or very early in life. Because the problem is structural (built into the cell’s blueprint), the inflammation-reducing effects of steroids usually cannot fix the leak.
Common types of genetic nephrotic syndrome
Genetic forms are typically categorised based on when they first appear and which gene is involved.
- Congenital Nephrotic Syndrome (CNS): This appears within the first three months of life. The most famous is the ‘Finnish type’ (caused by the NPHS1 gene), which causes massive protein loss starting in the womb.
- Infantile Nephrotic Syndrome: This develops between 3 and 12 months of age and is often linked to mutations in the NPHS2 gene (producing a protein called podocin).
- Familial Focal Segmental Glomerulosclerosis (FSGS): This can appear in older children or adults. It often runs in families and is caused by genetic mutations that lead to progressive scarring of the kidney filters.
Inheritance Patterns
In the UK, genetic counselling is offered to families to explain how these genes are passed down:
- Autosomal Recessive: Both parents must carry a copy of the faulty gene. There is a 1 in 4 chance for each child to be affected. This is common in the very early-onset types.
- Autosomal Dominant: Only one parent needs to have the mutation. This often presents later in life (adolescence or adulthood).
| Gene Mutation | Common Name/Type | Typical Age of Onset |
| NPHS1 | Congenital (Finnish Type) | Birth to 3 months |
| NPHS2 | Steroid-Resistant (Podocin) | 3 months to 5 years |
| WT1 | Denys-Drash Syndrome | Infancy/Childhood |
| INF2 / TRPC6 | Familial FSGS | Adolescence to Adulthood |
Steroid resistance and genetic testing
One of the hallmarks of genetic nephrotic syndrome is ‘steroid resistance’. In the UK, the standard first-line treatment for nephrotic syndrome is a high dose of corticosteroids. However, if a child’s kidneys do not respond to this treatment after 4 to 8 weeks, they are classified as steroid resistant.
At this stage, NICE guidelines and NHS protocols often suggest genetic testing. If a genetic mutation is found, doctors may stop the steroids to avoid their side effects (such as stunted growth or weakened bones), as they are unlikely to work. Instead, the focus shifts to blood pressure control, nutritional support, and preparing for future treatments like dialysis or a kidney transplant.
Genetic nephrotic syndrome and transplants
For many patients with genetic forms, the condition eventually leads to kidney failure. A significant advantage of knowing the condition is genetic relates to kidney transplantation.
In ‘primary’ (non-genetic) FSGS, there is a high risk (around 30 to 50 percent) that the disease will return and attack the new donor kidney. However, in many ‘genetic’ forms, the risk of the disease returning in the new kidney is very low. This is because the new kidney has ‘healthy’ DNA and healthy podocytes that are not affected by the patient’s original genetic mutation.
Nephrotic vs Nephritic: The Genetic Link
While nephrotic syndrome has many well-defined genetic causes, nephritic syndrome is less commonly purely genetic. Nephritic syndrome is usually caused by the immune system’s reaction to an infection or an autoimmune ‘flare’. However, some rare genetic conditions, such as Alport Syndrome, can cause features of both, highlighting the importance of a clear diagnosis.
Evidence and Clinical Data
In the UK, the use of ‘Next Generation Sequencing’ (NGS) has revolutionised how genetic kidney diseases are managed. Clinical data from the UK Kidney Association shows that identifying a genetic cause in children with steroid-resistant disease happens in approximately 20 to 30 percent of cases. This information is documented in the National Registry of Rare Kidney Diseases (RaDaR), which helps UK researchers better understand the long-term outcomes for these specific genetic mutations.
To Summarise
Genetic forms of nephrotic syndrome are rare but important to identify, especially in infants and those who do not respond to steroids. These conditions are caused by DNA mutations that affect the structure of the kidney’s filters. Unlike other types, genetic nephrotic syndrome is usually permanent and does not respond to traditional drug therapy, often requiring a focus on long-term kidney support and transplantation.
If you experience severe, sudden, or worsening symptoms, such as extreme facial swelling or difficulty breathing, call 999 immediately.
Is all nephrotic syndrome in babies genetic?
Not all, but the vast majority of cases appearing before the age of three months (congenital) have a genetic basis.
If I have the gene, will I definitely get the syndrome?
It depends on the specific gene. For ‘recessive’ types, you only get the syndrome if you have two copies. For ‘dominant’ types, one copy is enough, but symptoms may vary in severity.
How is the genetic test done in the UK?
It is usually a simple blood test arranged by a nephrologist or a clinical geneticist through the NHS Genomic Medicine Service.
Can adults have genetic nephrotic syndrome?
Yes, certain forms of FSGS are genetic and may not appear until a person is in their 20s, 30s, or even later.
Can genetic nephrotic syndrome be cured?
Currently, there is no way to ‘fix’ the DNA mutation, so the focus is on managing symptoms and eventually replacing kidney function through a transplant.
Should my other children be tested?
If a genetic mutation is identified in one child, a clinical geneticist will discuss the risks and benefits of testing siblings or other family members.
Authority Snapshot
This article was reviewed by Dr. Stefan Petrov, a UK-trained physician with experience in general medicine and diagnostic procedures. The information provided is in line with NHS genomic medicine protocols and NICE guidance on the management of steroid-resistant nephrotic syndrome. Our aim is to provide families with a clear understanding of how genetics can play a role in complex kidney conditions.
