Last reviewed: May 12, 2026 Last updated: May 12, 2026

Written by: Jay Hastings , CEO of PlexusDx

Jay Hastings is the CEO of PlexusDx, a precision health company focused on genetic testing, blood biomarker insights, and personalized wellness recommendations. He has more than 20 years of experience across healthcare innovation, genomics, laboratory operations, healthcare investing, and strategic finance. His work has included scaling healthcare startups, leading CLIA lab integrations, and helping expand consumer access to precision health tools.

Medically reviewed by: Jayden Lee, PharmD, EMBA

Jayden Lee, PharmD, EMBA, is the PlexusDx Medical Science Liaison with a PharmD and MBA specializing in pharmacogenomics and clinical product development, with a proven ability to bridge the gap between genomic research and practical patient outcomes. Dr. Lee has more than 10 years of professional experience in clinical pharmacy, academia, and research.

This article is part of the PlexusDx Education Hub — your resource for evidence-based guidance on Genetics & Kidney Health. Browse all Genetics & Kidney Health education

IgA nephropathy, also called Berger's disease, is one of the most common causes of primary glomerular kidney disease worldwide. It develops when a specific antibody — immunoglobulin A — deposits in the kidney's filtering units and triggers inflammation that can slowly scar the tissue. Its course varies enormously between people, and much of that variation traces back to genetics. Understanding the inherited biology behind IgA nephropathy helps explain why it clusters in families and differs so much across populations.

What IgA nephropathy is

The kidneys filter blood through millions of tiny structures called glomeruli. In IgA nephropathy, an abnormal form of IgA antibody accumulates in these glomeruli, provoking immune complexes, inflammation, and, over years, potential scarring that can reduce kidney function. Early signs are often subtle — blood or protein in the urine detected on a routine test — which is why the condition can go unnoticed until it is well established. Its progression ranges from stable and benign to advancing kidney impairment.

The genetic factors behind the disease

Genome-wide research has identified a clear hereditary component. A central mechanism involves galactose-deficient IgA1, an incompletely built antibody that the immune system treats as foreign. The gene C1GALT1 encodes the enzyme responsible for adding galactose to IgA1, and variants that reduce its activity are associated with higher levels of the deficient antibody. Variants across the HLA region — particularly HLA-DQ and HLA-DR genes — shape the immune response to those antibodies and are among the strongest signals in genetic studies. Deletions in the complement-related CFHR3/CFHR1 genes appear to be protective, linking the disease to the complement arm of immunity. These genes converge on the same immune and glycosylation pathways that drive the condition.

What the research shows

Large international studies show that IgA nephropathy risk varies markedly by ancestry, with higher genetic risk scores in East Asian populations — a pattern that mirrors real-world differences in disease frequency. The strongest and most reproducible associations sit in the HLA region, reinforcing that this is fundamentally an immune-mediated disease. Researchers describe a multi-hit model: inherited tendencies to produce galactose-deficient IgA1, plus immune and complement variants that determine how the body reacts to it, combine with environmental triggers such as mucosal infections.

Understanding genetic factors, not treatment

It is important to be clear about what genetics can and cannot do here. IgA nephropathy is diagnosed by a kidney biopsy and managed by nephrologists, and treatment decisions — blood pressure control, medications that reduce protein in the urine, and specialist care — belong entirely with your medical team. Genetic insight does not diagnose the disease, does not select a therapy, and is not a substitute for clinical evaluation. Its value is in understanding the immune and glycosylation pathways involved so that conversations with your provider are better informed.

What pathway-level genetic insight offers

The PlexusDx Precision Peptide Genetic Test analyzes 14 pathways, 49 peptides, 150+ genetic insights, including immune-signaling and inflammation pathways that are central to kidney biology. It provides context about your biology, not a diagnosis or a treatment plan. If you have blood or protein in your urine, or a family history of kidney disease, the essential next step is evaluation by a healthcare provider. Genetic context can complement — never replace — that clinical care.

Protecting kidney health with an informed approach

General kidney-supportive habits benefit everyone: managing blood pressure, staying well hydrated, limiting excess salt, avoiding unnecessary NSAID use, and not smoking. For anyone with a family history of IgA nephropathy or unexplained urinary findings, regular monitoring through a provider is the priority, because early detection gives the most options. Pairing that clinical vigilance with an understanding of your immune-pathway tendencies helps you engage with your care team as an informed partner.

Want pathway-level insight into your immune and inflammation biology? Take the Precision Peptide Genetic Test to better understand your baseline before your next conversation with a provider.

Frequently Asked Questions

Is IgA nephropathy inherited?

IgA nephropathy has a strong genetic component but is not simply passed down. Variants in C1GALT1, the HLA region, and complement genes like CFHR3 shape risk, and it can cluster in families. Environmental triggers such as mucosal infections also contribute to whether disease develops.

Can a genetic test diagnose IgA nephropathy?

No. IgA nephropathy is diagnosed by a kidney biopsy, not a genetic test. The Precision Peptide Genetic Test offers pathway-level insight into immune and inflammation biology. Any blood or protein in the urine should be evaluated by a healthcare provider or nephrologist.

Which genes are linked to IgA nephropathy?

C1GALT1 affects how the IgA1 antibody is built, HLA-DQ and HLA-DR variants shape the immune response to it, and CFHR3/CFHR1 deletions appear protective through the complement pathway. Together these genes point to an immune-mediated, multi-hit disease mechanism rather than a single causal variant.

How is IgA nephropathy managed?

Management is directed entirely by a nephrologist and typically centers on controlling blood pressure, reducing urinary protein, and monitoring kidney function over time. Genetic insight does not select treatment; it can help you understand the immune pathways involved and support informed conversations with your care team.

This article is part of the PlexusDx Education Hub. Browse all Genetics & Kidney Health education

The Precision Peptide Genetic Test analyzes how your genes influence peptide-related biological pathways. It does not recommend, prescribe, or determine which peptides you should use. Consult a qualified healthcare provider before beginning any peptide protocol.

Medical and Editorial Standards

Medical review process: This article was reviewed for medical accuracy, scientific clarity, evidence alignment, and appropriate discussion of genetics, medications, supplements, biomarkers, and health-related claims.

Sources and evidence: PlexusDx educational content is developed using peer-reviewed research, clinical literature, reputable medical references, and, where applicable, public health or regulatory guidance. References are included at the end of the article when scientific, medical, or health-related claims are discussed.

Commercial transparency: PlexusDx offers genetic testing, blood biomarker testing, personalized supplement recommendations, and related precision wellness services. Product mentions are intended to help readers understand available options and should not be interpreted as medical advice.

Important disclaimer: PlexusDx educational content is for informational purposes only and should not be used as a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making decisions about medications, supplements, genetic testing, lab testing, or health-related care.