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Researchers find gene linked to birth defects
Date:5/30/2010

An international group of researchers has identified the genetic cause of an inherited condition that causes severe foetal abnormalities.

The work, co-led by geneticists at the University of Leeds, together with colleagues from institutes and universities in Paris, Rome and San Diego, should allow couples at risk of conceiving babies with the profoundly disabling Meckel-Gruber and Joubert syndromes to be identified beforehand through genetic screening.

Their findings, which show how the disease gene stops cells' finger-like antennae or 'cilia' from detecting and relaying information, may ultimately lead to treatments for more common related disorders, such as spina bifida and polycystic kidney disease. The paper is published in Nature Genetics today.

"By understanding the science behind this relatively rare condition, we can gain insight into other developmental conditions that are less serious but far more frequent," said University of Leeds researcher Professor Colin A. Johnson. "Spina bifida, for example, is one of the most common birth defects, affecting in one in every 1000 children."

Meckel-Gruber syndrome and Joubert syndrome are part of a wider family of disorders known as 'ciliopathies' so-called because the cilia are not working as they should and do not respond properly to signals.

This lack of communication can prevent the neural tube from developing correctly in growing embryos, leading to abnormalities in the brain. Affected embryos can also develop abnormalities in the eyes, extra fingers or toes, and multiple cysts in their kidneys. These defects are often only picked up on a 12 week ultrasound scan.

To find the gene responsible for Meckel-Gruber and Joubert syndromes, the researchers examined DNA from families with a history of the disorder, from skin cells donated by patients, and from cells grown in the laboratory. They also studied zebrafish, which have very visible embryos.<
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Contact: Paula Gould
p.a.gould@leeds.ac.uk
44-113-343-8059
University of Leeds
Source:Eurekalert

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