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Developmental problems: Some exist in the genes
Date:8/17/2010

Philadelphia, PA, 17 August 2010 - Everyone is special in their own unique way. From a genetic point of view, no two humans are genetically identical. This means that DNA for each individual contains variants that are more or less comm. on in the overall population.

Some gene variations are actually genetic deletions, where sections of DNA 'code' are missing entirely. These variants are likely to have important effects on gene function and, therefore, likely to contribute to diseases associated with that gene. But what happens when multiple genes are disrupted in a single family?

A large collaborative study led by scientists based in Oxford, Bologna and Utrecht sheds some light on this complicated situation by describing the genomic characterization of a family with two rare microdeletions, in CNTNAP5 and DOCK4. Multiple members of this family were diagnosed with autism, dyslexia, and/or learning or social difficulties.

The genetic analysis revealed that the CNTNAP5 deletion segregated with autism. In contrast, the DOCK4 deletion was present in multiple individuals without autism, but this gene microdeletion co-segregated with reading difficulties.

"This report provides further evidence linking CNTNAP genes with autism, one of the most promising gene families in autism research," commented Dr. John Krystal, Editor of Biological Psychiatry, where this research is published. "But it also highlights how complex the connection between genes and syndromes can be, supporting the importance of DOCK4 for brain development particularly in circuits involved in reading- but questioning its role in autism."

"This is another example of the emerging theme whereby multiple rare genomic variants within a single family might, in combination, lead to the variable phenotypes associated with autism spectrum disorders," said first author Dr. Alistair Pagnamenta.

Interestingly, CNTNAP5 is closely related to other g
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Contact: Maureen Hunter
m.hunter@elsevier.com
215-239-3674
Elsevier
Source:Eurekalert

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