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Genome-wide analysis shows previously undetected abnormalities in parents of affected children
Date:6/24/2012

Nuremberg, Germany: The use of genome-wide array analysis[1] in parents whose children are suspected of having a genetic disease shows that the parents frequently also have previously undetected genetic abnormalities, a researcher from The Netherlands told the annual conference of the European Society of Human Genetics today (Sunday). Being aware of this is important to parents because it means that their risk of having another affected child is significantly increased.

Dr. Nicole de Leeuw, a clinical laboratory geneticist in the Department of Human Genetics of the Radboud University Nijmegen Medical Centre in Nijmegen, and colleagues performed genome-wide SNP[2] array analysis in 6,500 patients and 1,874 parents. The patients had intellectual disability and/or congenital abnormalities, and the parents of those in whom an aberration was detected were tested in a similar way to determine whether they had the same aberration as their child. Mosaic aberrations, where both genetically normal and abnormal cells are present in an individual, were not only found in one in every 300 patients, but in one in every 270 parents as well. "These abnormalities occurred more frequently than we had expected", said Dr. de Leeuw. "Armed with this knowledge, we can try to understand not only why, but also how genetic disease arises in individuals, and this can help us to provide better genetic counselling."

Analysis of patients' genomes showed 6.5% de novo (spontaneously arising) genomic imbalances, 9.1% of rare, inherited imbalances, and 0.8% of X-linked abnormalities. Moreover, with the additional data from their SNP array test results, the researchers were able to subsequently find pathogenic mutations in recessive disease genes, uniparental disomies (where a single chromosome is doubled leading to two genetically identical ones), and mosaic aneuploidies (an extra or missing chromosome in some of the cells of the body) in about 30 patients.

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Contact: Mary Rice
mary.rice@riceconseil.eu
European Society of Human Genetics
Source:Eurekalert

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