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Researchers identify new biomarker for Creutzfeldt-Jakob disease, the human form of mad cow disease
Date:3/9/2011

ce these biomarkers are elevated in several other diseases besides sCJD, the incidence of false positive results is high. Replacement of 14-3-3 with Tf increases the specificity of the test significantly, providing a superior biomarker combination for the diagnosis of sCJD.

The ability to accurately diagnose patients while they are still living is critical to prevent inadvertent spread of sCJD to healthy individuals, to reduce the misdiagnosis of potentially treatable causes of dementia, and to eventually develop potential therapies for sCJD, according to Dr. Singh.

As a part of their study, Dr. Singh and her team estimated levels of Tf in the CSF collected up to 24 months before death from confirmed cases of sCJD (n=99) and dementia of non-CJD origin (n=74). They found that levels of Tf were decreased significantly in sCJD cases compared to dementia of non-CJD origin. Further testing revealed that measurement of CSF Tf alone identified sCJD with a sensitivity of 85 percent, specificity of 72 percent, and accuracy of 80 percent. When combined with the surrogate biomarker T-tau, the CSF Tf and T-tau combination identified sCJD with an improved specificity of 87 percent and accuracy of 86 percent according to the research.

In addition to providing improved diagnostic accuracy, Dr. Singh notes that CSF Tf has several other advantages. It is resistant to degradation by enzymes, ensuring consistent results even in poorly preserved CSF samples; Tf-β2, the brain specific isoform of Tf is equally efficient in identifying sCJD and is likely to provide accurate results even from samples that are accidentally contaminated with blood during the collection process; and, Tf is abundant in the CSF relative to the currently used biomarkers 14-3-3 and T-tau, allowing accurate diagnosis from a small sample volume.

Moving forward, researchers will work to establish a user-friendly, quantitative test for CSF Tf to provide a quick and uniform method o
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Contact: Jessica Studeny
jessica.studeny@case.edu
216-368-4692
Case Western Reserve University
Source:Eurekalert

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