Background There is no practical and reliable premortem testfor CreutzfeldtJakob disease and the related transmissiblespongiform encephalopathies. Two proteins, designated 130 and131, which have been detected in low concentrations in cerebrospinalfluid from patients with CreutzfeldtJakob disease, appearto be sensitive and specific markers for the disease. Attemptsto identify these proteins, however, have been unsuccessful.We hypothesized that they may be present in the normal brain.
Methods We detected proteins 130 and 131 in normal human brain,partially sequenced their amino acids, and found that they matchedthe brain protein known as 14-3-3. We then developed a simple,rapid immunoassay for this protein and tested it in cerebrospinalfluid samples from 71 humans and 30 animals with spongiformencephalopathies and in control samples from 186 humans and94 animals.
Results The immunoassay detected the 14-3-3 protein in cerebrospinalfluid from 68 of the 71 patients with CreutzfeldtJakobdisease (96 percent; 95 percent confidence interval, 92 to 99percent). Among 94 patients with other dementias, the specificitywas 96 percent. If one excludes the three patients with dementiawho had had strokes within one month before testing, the specificitywas 99 percent. The test was positive in 12 of 24 patients withviral encephalitis. In animals the sensitivity of the assaywas 87 percent and the specificity was 99 percent.
Conclusions In patients with dementia, a positive immunoassayfor the 14-3-3 brain protein in cerebrospinal fluid stronglysupports a diagnosis of CreutzfeldtJakob disease. Thisfinding, however, does not support the use of the test in patientswithout clinically evident dementia.
Source Information
From the Laboratory of Central Nervous System Studies, National Institutes of Health, Bethesda, Md. (G.H., K.K., C.J.G.), and the Biology Division, California Institute of Technology, Pasadena (K.H.L., M.G.H.).
Address reprint requests to Dr. Gibbs at the Laboratory of Central Nervous System Studies, Basic Neurosciences Program, Division of Intramural Research, Bldg. 36, Rm. 4A05, 9000 Rockville Pike, Bethesda, MD 20892-4122, or to Dr. Harrington at Mailstop 139/74, California Institute of Technology, Pasadena, CA 91125.
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