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UCSF team describes genetic basis of rare human diseases
Date:7/8/2011

Researchers at the University of California, San Francisco and in Michigan, North Carolina and Spain have discovered how genetic mutations cause a number of rare human diseases, which include Meckel syndrome, Joubert syndrome and several other disorders.

The work gives doctors new possible targets for designing better diagnostics to detect and drugs to treat these diseases, which together affect perhaps one in 200 people in the United States.

On the surface, these diseases look very different. Meckel syndrome causes deadly brain malformations and kidney cysts. Joubert syndrome strikes people with severe movement disorders. But the work of the UCSF-led team, published this week in the journal Nature Genetics, found similarities between the diseases at the molecular level.

"We think these diseases have a common underlying cause," said UCSF developmental biologist Jeremy Reiter. "They are fundamentally caused by defects in 'antenna' on cells."

Seen in Twins from Bangladesh

Technically known as cilia, these antennae are protrusions that dangle off cells and, like tiny receivers, allow the cells to explore and interact with their environment. Found everywhere from the brain to the eyes to the lungs in humans, these antennae also exist in creatures as diverse as gorillas, gnats, aardvarks and algae.

What cilia do depends on where they are in the body. In the eyes or deep within the nostrils, they are covered with sensory proteins and help capture light and odors, forming the basis of our senses of sight and smell. In the lungs, cilia move, helping to expel foreign particles from the airways. They also lend mobility to sperm.

This wide range of functions is also reflected in people with genetic disorders like Joubert syndrome, which affects cilia in specific parts of their body. People with these diseases suffer symptoms related to what those cilia do, such things as blindness, infertility or
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Contact: Jason Socrates Bardi
jason.bardi@ucsf.edu
415-502-6397
University of California - San Francisco
Source:Eurekalert  

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