Autosomal Dominant Tubulointerstitial Kidney Disease (ADTKD-UMOD) / Familial Juvenile Hyperuricemic Nephropathy: A Patient Guide

Autosomal Dominant Tubulointerstitial Kidney Disease related to the UMOD gene (ADTKD-UMOD) is an inherited condition that causes a gradual decline in kidney function over many years. In the past, this condition was known by several different names, including Familial Juvenile Hyperuricemic Nephropathy (FJHN) and Medullary Cystic Kidney Disease type 2 (MCKD2). Today, doctors use a gene-based naming system to group these conditions together because they are all caused by mutations in the same blueprint: the UMOD gene ^[1][2].

The disease begins with a biological “traffic jam” inside your kidney cells. The UMOD gene is responsible for producing a protein called uromodulin, which is normally released into the urine. In people with this condition, a genetic mutation causes the protein to “misfold” into the wrong shape. These misfolded proteins cannot leave the cell and instead pile up in a part of the cell called the endoplasmic reticulum. This buildup creates chronic cellular stress, leading to inflammation and eventual scarring of the kidney’s tubules, which are the delicate tubes responsible for processing waste and water ^[3][4].

One of the most unique features of ADTKD-UMOD is how “quiet” it can be on standard medical tests. Unlike many other kidney diseases, it rarely causes blood or large amounts of protein to appear in the urine. Because of this “bland” urine, the disease often goes undetected until kidney function has significantly declined. However, the disease often announces itself early through high levels of uric acid in the blood. This often leads to painful gout flares, which can start as early as the teenage years or young adulthood, providing a vital clue for doctors and families ^[5][6].

Because the condition is autosomal dominant, there is a 50% chance of passing the mutation to each child. A pathogenic or likely pathogenic result on genetic testing, combined with a compatible clinical and family context, supports the diagnosis and provides an answer that a kidney biopsy often cannot. Testing is particularly crucial for family members who wish to be living kidney donors; they must be genetically screened to ensure they do not carry the familial mutation, as donating a kidney would be unsafe for them ^[7][8].

While there is currently no targeted cure to fix the protein-misfolding problem, ADTKD-UMOD is manageable through a partnership with your medical team. Treatment focuses on protecting your kidney function through individualized blood pressure control, a healthy lifestyle, and specialized medications for gout. For those who eventually face kidney failure, kidney transplantation is a successful option. The disease does not return in the new kidney, allowing many patients to live long, full lives. Understanding the genetics of your condition is not just about a diagnosis—it is about empowering you and your family to take proactive steps in your long-term care ^[9][10].