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Important clue to understanding the pathogenesis of ciliary disorders
Date:7/22/2010

Scientists led by Dr. Heiko Lickert, research group leader at the Institute of Stem Cell Research of Helmholtz Zentrum Mnchen, have identified the first gene shown to regulate cilia disassembly in a living organism. If the gene is defective, double and forked cilia develop thus the name Pitchfork. The consequences of the mutation include typical defects in the left-right asymmetry of body organs and heart failure.

The functional investigations were conducted primarily on the mouse model, together with the Institute of Developmental Genetics and the Department of Protein Analytics of Helmholtz Zentrum Mnchen. However, Dr. Lickert and his collaboration partner Nicolas Katsanis of Duke University in the U.S. were also able to show mutations in the Pitchfork gene in patients with ciliary diseases. In humans, the substitution of merely one amino acid in the Pitchfork protein can lead to an inversed position of all internal organs (situs inversus), to kidney and liver diseases, but also to severe heart defects. "Our study" Dr. Lickert said, "provides a new entry point to understand and categorize ciliary disease."

Background:

Cilia are hair-like cell protuberances, 5 to 10 m long and 250 nm thick, which are present in almost all human or animal cells. They function like antennas in the cells and play a pivotal role in the perception of the cellular surroundings and signal transduction.

Defective cilia usually have genetic causes and severe consequences: In recent years more than 30 diseases could be traced to ciliary dysfunctions. These ciliopathies affect numerous organ systems and show diverse clinical symptoms, but the molecular and cellular basis for this is not yet understood. The resulting disorders include developmental defects such as polycystic kidney, liver and pancreas diseases (incidence 1:800) and also heart defects and adiposity. An increased risk for common diseases such as diabetes or cancer is also very
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Contact: Sven Winkler
presse@helmholtz-muenchen.de
49-089-318-73946
Helmholtz Zentrum Mnchen - German Research Center for Environmental Health
Source:Eurekalert

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