|Other names: Medullary cystic kidney disease (historical), familial juvenile nephronophthisis|
|Nephronophthisis has an autosomal recessive pattern of inheritance.|
|Symptoms||Infantile: Oligohydramnios sequence|
Juvenile&adult: Increased urination, delayed milestone, low red blood cells
|Types||Infantile, juvenile, adolescent|
|Causes||Genetic mutation (autosomal recessive)|
|Diagnostic method||Based on lab tests, urine tests, and ultrasound|
|Differential diagnosis||Autosomal recessive polycystic kidney disease, autosomal dominant tubulointerstitial kidney disease|
|Treatment||Management of high blood pressure, electrolyte abnormalities, low red blood cells, dialysis, kidney transplant|
|Frequency||1 in 50,000 to 1,000,000|
Nephronophthisis (NPHP) is a genetic disorder of the kidneys. There are three types infantile, juvenile, and adolescent. The infantile form begins before birth and presents with oligohydramnios sequence. The juvenile and adolescent forms presents in childhood with increased urination, delayed milestone, and low red blood cells. Kidney failure occurs before the age of 30.
It is due to mutations in the NPHP genes. It is inherited in an autosomal recessive fashion. Up to 20% of cases may present as part of another syndrome such as Joubert or Bardet-Biedl. It is classified as a ciliopathy. Diagnosis is based on on lab tests, urine tests, and ultrasound of the kidneys.
Treatment may include managing high blood pressure, electrolyte abnormalities, and low red blood cells. Growth hormone may be useful in certain cases. Kidney failure may be treated with dialysis or kidney transplant.
It effects between 1 in 50,000 newborns in Canada and Finland to 1 in a million in the United States. It is the most common genetic cause of kidney failure before the age of 30. Nephronophthisis was first described by Smith and Graham in 1945. The word itself means "wasting of the nephrons".
Signs and symptoms
Infantile, juvenile, and adolescent forms of nephronophthisis have been identified. Although the range of characterizations is broad, people affected by nephronophthisis typically present with polyuria (production of a large volume of urine), polydipsia (excessive liquid intake), and after several months to years, end-stage kidney disease, a condition necessitating either dialysis or a kidney transplant in order to survive. Some individuals that suffer from nephronophthisis also have so-called "extra-renal symptoms" which can include tapetoretinal degeneration, liver problems, ocularmotor apraxia, and cone-shaped epiphysis (Saldino-Mainzer syndrome).
Mechanism of nephronophthisis indicates that all proteins mutated in cystic kidney diseases express themselves in primary cilia. NPHP gene mutations cause defects in signaling resulting in flaws of planar cell polarity. The ciliary theory indicates that multiple organs are involved in NPHP (retinal degeneration, cerebellar hypoplasia, liver fibrosis, and intellectual disability).
Related genetic disorders
Nephronophthisis is a ciliopathy. Other known ciliopathies include primary ciliary dyskinesia, Bardet–Biedl syndrome, polycystic kidney and liver disease, Alström syndrome, Meckel–Gruber syndrome and some forms of retinal degeneration.
NPHP2 is infantile type of nephropthisis and sometimes associated with situs inversus this can be explained by its relation with inversin gene. NPHP1, NPHP3, NPHP4, NPHP5, and NPHP6 are sometimes seen with retinitis pigmentosa, this particular association has a name, Senior-Loken syndrome.
The management of this condition can be done via-improvement of any electrolyte imbalance, as well as, high blood pressure and low red blood cell counts (anemia) treatment as the individual's condition warrants.
Nephronophthisis occurs equally in both sexes and has an estimate 9 in about 8 million rate in individuals. Nephronophthisis is the leading monogenic cause of end-stage kidney disease.
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