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Autosomal dominant tubulointerstitial kidney disease

Autosomal dominant tubulointerstitial kidney disease



Overview

Autosomal dominant tubulointerstitial kidney disease–UMOD (ADTKD-UMOD) is a rare genetic disorder caused by mutations in the UMOD gene that leads to slowly progressive chronic kidney disease and high uric acid levels

Symptoms

Elevated blood creatinine: Often found by chance during routine blood tests. 

Decreased GFR: A drop in the glomerular filtration rate showing reduced kidney function. High uric acid and gout: High blood levels of uric acid leading to painful joint inflammation (gout) often start in the teen years for patients with specific gene types like ADTKD-UMOD.

Nocturia and thirst: Waking up at night to pass urine (nocturia) or feeling an increased thirst because kidneys lose the ability to concentrate urine. 

Fatigue and weakness: Extreme tiredness caused by anemia (low red blood cell count).

Loss of appetite: Decreased desire to eat.

High blood pressure: Can develop or modestly increase as kidney damage progresses.

End-stage kidney disease (ESKD): Total loss of kidney function, typically requiring dialysis or a transplant between early adulthood and later life (ages 20 to 80, with a mean around 45)

Causes

ADTKD is classified based on the specific gene that carries the mutation. An autosomal dominant pattern means only one copy of the mutated gene from a parent is needed to cause the condition.

MOD Gene: Encodes uromodulin (Tamm-Horsfall protein). Mutations cause abnormal protein buildup in kidney cells, leading to cell death and ADTKD-UMOD, which is frequently linked to high uric acid and gout.

MUC1 Gene: Encodes mucin-1. A frameshift mutation creates a mutant protein that accumulates inside tubular cells, causing ADTKD-MUC1 kidney disease. 

REN Gene: Encodes renin. Mutations disrupt normal renin production and processing, causing ADTKD-REN which often presents in childhood with low blood pressure and high potassium. 

HNF1B Gene: Encodes hepatocyte nuclear factor 1-beta. Mutations cause ADTKD-HNF1B, which can also involve developmental cysts and early-onset diabetes (MODY5).

Rare/Atypical Genes: SEC61A1 and DNAJB11 mutations are less common genetic causes of the disorder.

Diagnosis

Doctors suspect ADTKD based on clinical clues and family history rather than distinct early symptoms, as the condition progresses silently.

Family History: A clear pattern of chronic kidney disease (CKD) passed from parent to child across generations (autosomal dominant inheritance). 

Bland Urinalysis: Normal or near-normal urine tests with little to no protein and no red blood cells, which rules out primary glomerular diseases. 

Associated Features: Early-onset hyperuricemia (high uric acid) and gout, especially in teenagers or young adults with UMOD or REN mutations. Low blood pressure or high potassium may point specifically to REN mutations. 

Imaging: Ultrasound scans may show normal or small kidneys, sometimes with small cysts. 

Definitive Genetic Test: Next-generation sequencing or gene panels targeting ADTKD-related genes confirm the exact molecular diagnosis.

Treatments

Follow standard KDIGO Guidelines for chronic kidney disease progression.

Drink plenty of fluids to avoid dehydration due to water and salt loss.Avoid nephrotoxic drugs like nonsteroidal anti-inflammatory drugs (NSAIDs).Avoid routine low-sodium diets or diuretics unless specifically advised, as some subtypes involve salt-wasting and hypotension

ADTKD-UMOD & ADTKD-REN: Use allopurinol or febuxostat to control high uric acid and prevent gout.

ADTKD-REN: Use fludrocortisone to help correct low blood pressure, high potassium, and acid levels in the blood.

ADTKD-SEC61A1: Manage congenital anemia and watch for opportunistic infections.

Dialysis: Used when kidney function declines to end-stage renal disease.

Kidney Transplantation: Considered the definitive and curative treatment option because the disease does not recur in the transplanted kidney. Living donors from the family should undergo genetic testing first to ensure they do not carry the condition. 

Type of Doctor Department : A nephrologist

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