Elevated CSF N-acetylaspartylglutamate suggests specific molecular diagnostic abnormalities in patients with white matter diseases.

Biochimica Et Biophysica Acta
Fanny MochelOdile Boespflug-Tanguy

Abstract

In order to identify biomarkers useful for the diagnosis of genetic white matter disorders we compared the metabolic profile of patients with leukodystrophies with a hypomyelinating or a non-hypomyelinating MRI pattern. We used a non-a priori method of in vitro ¹H-NMR spectroscopy on CSF samples of 74 patients with leukodystrophies. We found an elevation of CSF N-acetylaspartylglutamate (NAAG) in patients with Pelizaeus-Merzbacher disease (PMD)-PLP1 gene, Pelizaeus-Merzbacher-like disease-GJC2 gene and Canavan disease-ASPA gene. In the PMD group, NAAG was significantly elevated in the CSF of all patients with PLP1 duplication (19/19) but was strictly normal in 6 out of 7 patients with PLP1 point mutations. Additionally, we previously reported increased CSF NAAG in patients with SLC17A5 mutations. Elevated CSF NAAG is a biomarker that suggests specific molecular diagnostic abnormalities in patients with white matter diseases. Our findings also point to unique pathological functions of the overexpressed PLP in PMD patients with duplication of this gene.

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Citations

Feb 22, 2012·Journal of Neuroimmunology·Ghaniah Hassan-SmithAlexandra J Sinclair
Aug 19, 2014·Glia·Johannes Hirrlinger, Klaus-Armin Nave
Jul 31, 2013·The Biochemical Journal·Julia Lodder-GadaczekMatthias Eckhardt
Oct 21, 2015·Journal of Computer Assisted Tomography·Stephan UlmerFrank J Ahlhelm
Apr 2, 2011·The Journal of Biological Chemistry·Julia Lodder-GadaczekMatthias Eckhardt

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