Autosomal recessive polycystic kidney
|Autosomal recessive polycystic kidney disease|
ARPKD is inherited in an autosomal recessive pattern
|Classification and external resources|
Autosomal recessive polycystic kidney disease (ARPKD) is the recessive form of polycystic kidney. It is associated with a group of congenital fibrocystic syndromes. Mutations in the PKHD1 (chromosomal locus 6p12.2) cause ARPKD.
Signs and symptoms
Symptoms and signs include abdominal discomfort, polyuria, polydipsia, incidental discovery of hypertension, abdominal mass. The classic presentation for ARPKD is systemic hypertension with progression to end-stage renal disease (ESRD) by the age of 15. In atypical presentation, a small number of ARPKD sufferers live to adulthood with some kidney function; but with significant deterioration in liver function. This outcome is postulated to result from expression of the polycystic kidney and hepatic disease gene PKHD1, which is located on chromosome 6p.
The cause of autosomal recessive polycystic kidney disease is linked to mutations in the PKHD1 gene.
ARPKD is a significant hereditary renal disease in that appears in childhood. The prevalence is estimated to be of 1 in 20,000 live births. With a reported carrier frequency of up to 1:70. The single gene mutation called ‘’PKHD1’’ is fully responsible for the disease presentation of ARPKD. This PKHD1 is located on the human chromosome region 6p21.1-6p12.2. It is also one of the largest genes in the genome as it occupies approximately 450 kb of DNA, and contains at least 86 exons.
It is capable of producing multiple alternatively spliced transcripts. The largest known transcript encodes fibrocystin /polyductin (FPC), which is a large receptor-like integral membrane protein of 4074 amino acids. The structure of the FPC consist of a single transmembrane, a large N-terminal extracellular region, and a short intracellular cytoplasmic domain. The FPC protein is found on the primary cilia of epithelia cells of cortical and medullary collecting ducts and cholangiocytes of bile ducts, and show similarity to polycystins and several other ciliopathy proteins. FPC is also found to be expressed on the basal body and plasma membrane. It is presumed that the large extracellular domain of FPC binds to a ligand(s) that is yet unknown and that is also involved in cell-cell and cell-matrix interactions.
It is known that FPC interacts with ADPKD protein PC2 and may also participate in this regulation pathday of the mechanosensory function of the primary cilia, calcium signaling, and PCP. This is suggesting a common mechanism underlying cystogenesis between ADPKD and ARPKD. The FPC protein is also found on the centrosomes and mitotic spindle and may regulate centrosome duplication and mitotic spindle assembly during cell division. There have been a large number of various single gene mutations found throughout PKHD1 and are unique to individual families. Most of the patients are compound heterozygotes for PKHD1 mutations. Patients with two nonsense mutations appear to have an earlier onset of the disease.
Ultrasonography is the primary method to evaluate autosomal recessive polycystic kidney disease (ARPKD),particularly in the perinatal and neonatal. Diagnostic criteria require two or more cysts in one kidney and at least one cyst in the contralateral kidney in young subjects, but four or more in subjects older than 60 years, because of the increased frequency of benign simple cysts. Most often, the diagnosis is made from a positive family history and imaging studies showing large kidneys with multiple bilateral cysts and possibly liver cysts. Before the age of 30 years, CT scan or T2-weighted MRI is more sensitive for detecting presymptomatic disease because the sensitivity of ultrasound falls to 95% for ADPKD type 1 and <70% for ADPKD type 2.[medical citation needed] Genetic counseling is essential for those being screened. It is recommended that screening for asymptomatic intracranial aneurysms should be restricted to patients with a personal or family history of intracranial hemorrhage. Intervention should be limited to aneurysms larger than 10 mm. Someone with this disease has a 5% chance of getting brain aneurysms.[medical citation needed]Von Meyenburg complex is often co-existent with autosomal recessive polycystic kidney disease.
The treatment options for autosomal recessive polycystic kidney disease ,given there is no current cure,are:
- medications to deal with hypertension
- medications and/or surgery for pain
- antibiotics in the event of any infection
- kidney transplantation, in more serious cases
- and dialysis should there be renal failure
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- ARPKD/CHF Alliance at http://www.arpkdchf.org, for information on ARPKD and Congenital Hepatic Fibrosis (CHF).
- Global Rare Diseases Patient Registry and Data Repository (GRDR) for clinical research: http://arpkd-chf.grdr.info/index.php
- The Polycystic Kidney Disease Foundation website - more details on trials, treatments, nutrition, and support.