A Rutgers-led study used CRISPR to alter a gene in the roundworm Caenorhabditis elegans and examine a worm version of a human genetic change associated with autosomal dominant polycystic kidney disease (ADPKD). The altered protein failed to reach its usual location in cilia, and mutant male worms showed impaired mating behavior. The result helps explain how a selected change affects protein function in worms; it does not show what happens in human kidneys or offer a treatment.
What did the worm study find about polycystic kidney disease?
The team introduced a change in worm polycystin-2 corresponding to a human genetic change classified as likely to cause disease and associated with ADPKD. The study, by Juan Wang and colleagues, was published in Genetics in 2026 as “A C. elegans model for functional analysis of conserved ADPKD variants in cilia, extracellular vesicles, and sensory signaling” (DOI: 10.1093/genetics/iyag182).
In the altered worms, polycystin-2 levels in the main part of nerve cells fell to about 15% of normal, according to Rutgers’ September 21, 2026 summary. The protein was not detectable in cilia, small projections from cells. The amount of its partner, polycystin-1, also fell, and that protein was absent from cilia. These observations point to a problem with protein abundance and location in the worm model.
The behavioral test
Male worms use sensory neurons to detect and respond to potential mates. In the Rutgers-reported experiment, 20% of mutant males initiated the expected mating behavior after contacting a partner, compared with all normal males tested. Researchers tested 60 males in each group. These are results from worm behavior assays, not estimates of disease risk, prevalence, or severity in people.
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Why use a worm to study a kidney-disease gene?
Worms do not have kidneys, so this was not a miniature model of kidney disease. The reason to use C. elegans is that it has corresponding polycystin proteins that function in cilia. In male worms, the proteins’ roles in sensory neurons also make it possible to measure a related behavior. The experiment therefore tests selected, conserved protein functions rather than kidney structure or disease progression.
ADPKD is an inherited condition in which fluid-filled sacs grow in the kidneys and may eventually lead to kidney failure. Rutgers describes most cases as involving changes in one of two genes encoding the cooperating proteins polycystin-1 and polycystin-2. A worm experiment focused on one modeled change cannot explain every genetic cause or feature of ADPKD.
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What happened when worms had both healthy and altered gene copies?
In worms carrying both healthy and altered copies, the healthy polycystin-2 reached cilia while the mutant protein did not. The animals performed normally in the mating tests. Rutgers reports that the altered protein did not displace the healthy protein from its location or prevent it from functioning normally in this assay.
This finding suggests that, in the tested worm model and measured behavior, one healthy copy was sufficient to support normal performance. It does not establish how the corresponding human genetic change behaves in kidney cells.
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What the study does—and does not—show
- It shows: The engineered worm protein was reduced in nerve-cell bodies and was not detected in cilia; its partner protein also declined, and mutant male worms had a lower rate of initiating the measured mating behavior.
- It does not show: That the human genetic change has the same effect in kidney cells, that the worms developed kidney disease, or that the result establishes a diagnosis or predicts an individual’s health.
- It did not test: A treatment. The work is a functional study of a genetic change, not evidence that a therapy works.
Lead author Juan Wang, an associate research professor in Rutgers’ Department of Genetics, said: “As genetic testing becomes more common in medicine, doctors are finding many DNA changes whose effects are difficult to understand.” He described the worm model as a way to investigate such changes, but its relevance to a person depends on further evidence in human cells and other appropriate models.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Who conducted the research?
The work was led by Juan Wang in the laboratory of Maureen Barr, a Rutgers Distinguished Professor of Genetics. Rutgers also names Carlos Nava Cruz, Inna Nikonorova, Jonathan Walsh, and Elizabeth desRanleau among the researchers. The university says the work was funded by the National Institutes of Health and the Polycystic Kidney Disease Foundation.
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Rutgers’ account of the study is available at Rutgers University; Medical Xpress also reported the paper title and DOI in its September 21, 2026 coverage.
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