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Mayo Clinic researchers identify gene for inherited kidney and liver disease in young children

ROCHESTER, MINN.- Researchers at Mayo Clinic have identified the gene causing an inherited form of childhood kidney disease associated with renal failure and neonatal death. The discovery may improve prospects for gene testing and diagnosis of this life-threatening disease.

The results of the Mayo Clinic study are published in the March issue of Nature Genetics.

Autosomal recessive polycystic kidney disease (ARPKD) is one of the most common childhood diseases of the kidneys. ARPKD, also known as infantile PKD, affects one in 20,000 Americans. The disease results in the development of multiple fluid-filled cysts in the kidney, fibrosis in the liver and often poor lung development and neonatal death.

"Identifying the causative gene is a major step forward, as the progression of the disease can now be studied. It improves the prospects for gene-based diagnostics," says Peter C. Harris, Ph.D., Mayo Clinic nephrologist and the lead researcher in the study.

Improved respiratory treatment has increased newborn survival, but roughly 30 percent of affected babies still die in infancy. Renal disease is usually evident in the neonate. However, when ARPKD appears later in childhood, it is usually associated with less massive renal enlargement and more variability in cyst size. Approximately 50 percent of affected babies who survive the neonatal period progress to end-stage renal disease (ESRD) within 10 years. About 45 percent of infants with ARPKD also have liver disease, which is often a major feature in older children.

Two genes have been identified for the more common, dominant form of PKD. The genetic cause of the recessive type, inherited only when both parents carry an abnormal copy of the disease gene, was more difficult to isolate. In 1994, a German group narrowed the area of the disease gene to a region on chromosome 6. Dr. Harris and colleagues at Mayo Clinic were able to identify the gene by first finding a gene that ca
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Contact: John Murphy
newsbureau@mayo.edu
507-284-2511
Mayo Clinic
4-Feb-2002


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