A Nephraware Explainer

Why do some kidney problems run in families?

Your kidneys clean your blood every day. Sometimes a tiny instruction called a gene can make a kidney work differently. Genes get passed from parents to kids, just like eye color or height.

500+genes linked to kidney disease [1]

10-20%of adult CKD traced to one gene [2]

30-75%estimated heritability of CKD risk [3]

Start here

What's a gene, anyway?

A gene is a tiny instruction inside every cell in your body. Genes tell your body how to build itself, including your kidneys.

You have thousands of genes. You got half from your mom and half from your dad.

Kidneys use hundreds of genes just to build one tiny filter [1]

How traits travel

Two copies, two parents

For most kidney genes, you get one copy from your mom and one from your dad. Tap a button below to see what can happen.

The cast of characters

Meet the genes behind 5 kidney conditions

Each card below is about one kidney condition. Some of these conditions are caused directly by a gene change. For others, a gene change raises the chance of developing the condition.

PKD1 & PKD2

"The bubble-wrap genes" · ADPKD

Autosomal dominant

These genes help kidney tubes grow the right way. When they change, tiny fluid-filled bubbles called cysts slowly form and grow on the kidneys over many years.

Estimated to affect around 1 in 400-1,000 people [5]

PKHD1

"The early starter" · ARPKD

Recessive

This gene also helps kidney tubes grow. But to get this condition, a baby needs a changed copy from both parents. It shows up very early, sometimes even before birth.

Historical estimates: ~1 in 20,000 births; carrier rate ~1 in 70 (European populations) [5]

COL4A3 · A4 · A5

"The support-rope genes" · Alport syndrome

X-linked or autosomal

These genes build a strong material that holds the kidney's filter together. The same material is also used in your ears and eyes. When the genes change, the filter can leak and hearing or eyesight may be affected too.

Can affect kidney function, hearing, and vision [7]

APOL1

"The ancient bodyguard gene"

Risk highest with 2 copies

A long time ago, a special form of this gene helped protect people from a harmful parasite. Having two changed copies can raise the chance of kidney problems. But most people with two changed copies stay healthy.

Estimated 15-20% lifetime risk with two risk alleles; varies between individuals [8]

NPHS1 & NPHS2

"The gatekeeper genes" · Nephrotic syndrome

Recessive

Deep inside the kidney's filter are tiny gates. These genes build those gates. When the genes change, the gates stop working and protein leaks into the pee. Doctors call this nephrotic syndrome.

Important causes of childhood genetic steroid-resistant nephrotic syndrome [10]

Finding out

Being a kidney detective

A gene test reads your body's instructions to find the change that caused the kidney problem. It is usually just a quick blood draw or a cheek swab.

Give a sample

A quick blood draw or cheek swab. No surgery needed.

The lab reads the code

Scientists read the relevant genes and look for any changes.

A genetic counselor explains it

A specialist sits with the family and explains what the results mean in plain language.

The family gets the full picture

Other family members can choose to be tested too, sometimes before they have any symptoms.

It's nobody's fault

Genes are shuffled randomly every time a baby is made. Nobody chooses which genes get passed down. A genetic kidney condition is never something a parent did or a kid caused. It is simply how the instructions were copied.

Looking ahead

Science is racing ahead

Scientists are working to use what they know about kidney genes to help kids and families get better care.

Earlier treatment, better outcomes

Starting ACE-inhibitor therapy in Alport syndrome before protein even appears in urine now meaningfully slows kidney damage. [16]

Gene therapy trials are underway

Investigational genetic therapies for Alport syndrome and drugs targeting the PKD pathway are in active clinical trials. [13] [14] [15]

Testing guides real decisions

Major kidney organizations (KDIGO, the National Kidney Foundation) now recommend considering genetic testing for unexplained kidney disease. [11] [12]

Bigger genetic biobanks, faster discoveries

Large research databases are helping scientists find new kidney genes and build tools to estimate risk more precisely. [3]

Bring this to clinic

Questions worth asking

A few conversation starters families have found useful at a nephrology appointment.

Has a specific gene been identified, or is testing still in progress?

What's the inheritance pattern, and should siblings or other relatives be tested?

Does this diagnosis change which treatments are likely to help?

Are there clinical trials our family might be eligible for?

Show your work

References

Every claim, stat, and gene fact on this page traces back to one of the sources below - mostly peer-reviewed journals and clinical guidelines published between 2021 and 2026.

View all 16 references

Simons M, Hoefele J. Genetic kidney diseases - from discovery to precision care. Med Genet. 2026;38(1):1-2. pmc.ncbi.nlm.nih.gov/articles/PMC12910340More than 500 genes described; scope of hundreds of genes involved in kidney/nephron formation.
Paterson AL, Chan MMY, Roufosse C. Genetic kidney disease in adults - the pathologists' perspective. Nephrol Dial Transplant. 2026;41(8):1421-1428. academic.oup.com/ndtMonogenic disease accounts for 10-20% of adult CKD; 2024 KDIGO CKD guideline on genetic testing.
Sadeghi-Alavijeh O, et al. Using large genomic biobanks to generate insights into genetic kidney disease. Semin Nephrol. 2025;45(5):151651. pmc.ncbi.nlm.nih.gov/articles/PMC12411989Family/twin studies estimate CKD heritability at 30--75%; role of genomic biobanks in discovery.
Autosomal dominant polycystic kidney disease: an overview of recent genetic and clinical advances. Ren Fail. 2025;Article 2492374. tandfonline.comPKD1 (~78%) and PKD2 (~15%) account for most ADPKD; ADPKD is the most common inherited kidney disease.
Pediatric Polycystic Kidney Disease: Background, Etiology, Epidemiology. Medscape. emedicine.medscape.comADPKD prevalence ~1 in 400--1,000; ARPKD ~1 in 20,000 births with a carrier rate of ~1 in 70.
A 15-year experience highlighting the spectrum of Alport kidney disease in the pediatric population and novel genetic variants in COL4A3--5. Pediatr Nephrol. 2025. pmc.ncbi.nlm.nih.gov/articles/PMC12116809Cohort of 85 pediatric patients: ~80% X-linked, ~20% autosomal COL4A3/4/5-related Alport disease.
Exploration of Gene Therapy for Alport Syndrome. Int J Mol Sci / PMC. pmc.ncbi.nlm.nih.gov/articles/PMC11200676Reported Alport syndrome incidence ranges from about 1 in 5,000 to 1 in 53,000 individuals.
APOL1-Mediated Kidney Disease (AMKD). National Kidney Foundation. kidney.orgPeople with two APOL1 risk variants have roughly a 15--20% lifetime chance of kidney disease; about 80% never develop it.
Friedman DJ, Pollak MR. APOL1 Nephropathy: From Genetics to Clinical Applications. Clin J Am Soc Nephrol. 2021;16(2):294--303. journals.lww.com/cjasnPopulation genetics and evolutionary origin of APOL1 risk variants; recessive-pattern risk framing.
NPHS Mutations in Pediatric Patients with Congenital and Steroid-Resistant Nephrotic Syndrome. PMC. 2024. pmc.ncbi.nlm.nih.gov/articles/PMC11594456NPHS1 (nephrin) and NPHS2 (podocin) variants as a leading cause of steroid-resistant nephrotic syndrome.
Franceschini N, Feldman DL, Berg JS, et al. Advancing Genetic Testing in Kidney Diseases: Report From a National Kidney Foundation Working Group. Am J Kidney Dis. 2024;84(6):751--766.Recommendations on when and how to pursue genetic testing in CKD, including family and transplant-donor testing.
Kidney Disease: Improving Global Outcomes (KDIGO). 2025 Clinical Practice Guideline for the Evaluation, Management, and Treatment of ADPKD. Kidney Int. 2025;107(2S):S1--S239.Guideline basis for considering genetic testing and specialist evaluation in ADPKD care.
A Confirmatory Trial of Dapagliflozin in Adolescents and Young Adults with Alport Syndrome (DOUBLE PRO-TECT Alport). ClinicalTrials.gov NCT05944016. clinicaltrials.gov/study/NCT05944016Active phase 3 trial of an SGLT2 inhibitor in pediatric/young-adult Alport syndrome.
EXACT Trial (exaluren), an investigational genetic therapy for COL4A3/4/5 nonsense variants. Alport Syndrome Foundation - Clinical Trials. alportsyndrome.orgPhase 2 trial of an investigational genetic therapy for Alport syndrome.
Prospects for Gene Therapy in Polycystic Kidney Disease. Curr Opin Nephrol Hypertens. 2025;34(1):121--127. pmc.ncbi.nlm.nih.gov/articles/PMC11606769Review of gene-therapy and gene-editing approaches under investigation for ADPKD/ARPKD.
Alport Syndrome. Nephraware.org condition guide. nephraware.org/diseases/alport-syndromeConsistency reference for inheritance percentages and early ACE-inhibitor treatment guidance used elsewhere on the site.

This list favors recent (2021-2026), peer-reviewed or guideline-level sources. Prevalence figures vary across studies and populations - treat the ranges above as general orientation, not a specific family's risk, which a genetic counselor can estimate precisely.