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Novel test streamlines testing for Huntington Disease
Date:2/12/2013

Philadelphia, PA, February 13, 2013 A new test may help to streamline genetic testing for Huntington Disease (HD) by generating accurate results, avoiding unnecessary additional testing, and improving turnaround time. The test, which uses chimeric or triplet repeat primed PCR (TP PCR) methodology, yielded results that were 100% concordant with standard genotyping methods in an analysis of 246 samples. The high sensitivity and specificity of the test could reduce the number of false negative results and facilitate both diagnosis and prognosis by correctly sizing the genetic abnormality characteristic of HD.

Huntington disease (also known as Huntington's disease or Huntington's chorea) is an inherited and progressive neurodegenerative disorder that typically becomes apparent during a person's thirties or forties. With time, HD patients develop diminished muscle coordination that is evident in walking, speaking, and swallowing and undergo changes in personality and thinking ability. A mutation in the Huntingtin gene leads to an abnormal number of repeats of a sequence of three nucleotides known as CAG. Based on the number of CAG repeats, a person may be deemed to be normal (10-35 repeats), at low risk (36-39 repeats), or at high risk (greater than 40 repeats) of having or developing HD symptoms. That is why accurately determining the number of CAG repeats is so important.

In this study, 246 samples that had been previously analyzed by other methods were tested with the new method (TP PCR). The samples included 14 DNA reference samples from the Coriell Cell Repositories, three samples from the College of American Pathologists 2002 Survey, and 229 samples from individuals tested at ARUP Laboratories for clinical purposes by standard technologies, explained lead investigator Elaine Lyon, PhD, Medical Director of Molecular Genetics, ARUP Laboratories and its Institute for Clinical and Experimental Pathology, and Department of Pathology, University o
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Contact: David Sampson
jmdmedia@elsevier.com
215-239-3171
Elsevier Health Sciences
Source:Eurekalert

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