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Primary cilia formation provides insight into genetic diseases
Date:4/14/2010

A team of scientists at the University of California, San Diego School of Medicine have identified a network of genes that initiate and manage cilia formation. Although scientists have known about cilia for decades, only recently have they discovered their role in disease. This new discovery, which may lead to new therapies for ciliopathies, will appear in the April 15 edition of Nature.

Primary cilia are small, hair-like appendages attached to the surface of human cells. They act like antennae, sensing and evaluating extracellular signals to coordinate the development and stability of a wide variety of organs. Ciliopathies are a newly emerging group of genetic diseases caused by defects in the function or structure of cellular primary cilia. These diseases present symptoms such as mental retardation, retinal blindness, obesity, polycystic kidney disease, liver fibrosis, ataxia and some forms of cancer.

The scientists, led by Joe Gleeson, MD, professor of neurosciences and pediatrics at UC San Diego and a Howard Hughes Medical Institute Investigator, and Joon Kim, a UC San Diego postdoctoral fellow, utilized a high-throughput, cell-based screen to evaluate the impact of more than 8,000 genes and their relation to cilia function and development.

"Utilizing high-throughput screening, we were able view a wider array of the genes implicated in ciliopathies and enact systematic approaches, which enabled us to gain deeper insight into the molecular mechanisms of cilia formation," said Gleeson.

Additional investigation revealed that the endocytic recycling pathway, which absorbs and processes plasma membrane, also plays a key role in primary cilia formation. The scientists also identified protein groups that are key modulators between cilia and the endocytic recycling pathway. These findings suggest that there are specific protein targets for the development of ciliopathy therapy, according to Gleeson.

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Contact: Jamee Lynn Smith
jlynnsmith@ucsd.edu
619-543-6163
University of California - San Diego
Source:Eurekalert

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