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GGC and Collaborators Identify New Genetic Cause for Polycystic Genetic Kidney Disease

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Greenwood Genetic Center
GGC and Collaborators Identify New Genetic Cause for Polycystic Genetic Kidney Disease

At age 11, Aaron Ritz woke up with side pain. His pediatrician sent him to the hospital where he was found to be in complete renal failure. He started dialysis the next day.


Young boy asleep on hospital bed“Aaron was diagnosed with polycystic kidney disease, which he likely had from birth, but aside from being small for his age, we had no signs that anything was wrong,” said Aaron’s mother Brandy Ritz. “In less than 24 hours, our world was turned completely upside down.”


There are two forms of polycystic kidney disease (PKD). The autosomal dominant form affects approximately 1/1000 individuals. It typically presents in adulthood and is most often caused by a single genetic mutation in one of two genes, PKD1 or PKD2. The autosomal recessive form of PKD is less common (1/20,000) and presents prenatally or in early childhood with two mutations within the same gene.


Aaron’s nephrologist suggested genetic testing due to the unusual nature of his clinical presentation, so he was seen at the Greenwood Genetic Center. Testing revealed no mutations in the genes most commonly associated with polycystic kidney disease, but he did have a single variant in a gene called NEK8.


“NEK8 is known to be a rare cause of autosomal recessive PKD when there are two mutations present, and typically there are also other extra-renal manifestations such as liver and pancreatic involvement,” said Rich Steet, PhD, Director of Research at the Greenwood Genetic Center (GGC). “But Aaron, who had no other organ involvement, only had a single genetic change in NEK8 which had never been associated with kidney disease.”


Steet noted that this is important work that expands our understanding of both the NEK8 gene and polycystic kidney disease. “In the future, clinicians should pay attention to single NEK8 variants in patients with PKD, include this gene in genetic testing panels, and consider the possibility of a single NEK8 variant as disease-causing,” added Steet.


The collaborators published these new findings in Kidney International, a journal of the International Society of Nephrology, in August.


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