Abstract
Methylmalonic acidemia (MMA) is an inherited metabolic disease. In this condition, metabolism from methylmalonyl coenzyme A (CoA) to succinyl-CoA is inhibited because of either low methylmalonyl-CoA mutase (MCM) activity or adenosylcobalamin deficiency owing to altered vitamin B12 metabolism. A high-precision assay for detecting MCM activity would facilitate not only MMA diagnosis but also the ability to determine the severity of MMA. We developed an MCM assay method based on ultrahigh-performance liquid chromatography–tandem mass spectrometry (UPLC–MS/MS) that involves the determination of succinyl-CoA, which is formed in an enzyme reaction, using peripheral lymphocytes. Using 0.05, 0.5, and 5 μmol/L succinyl-CoA, the intra-assay coefficient of variation (CV) was less than 5.2 % and the inter-assay CV was less than 8.7 %. The MCM activities of five healthy individuals and four patients were investigated with this assay. The MCM activities of the patients were very low in relation to those of healthy individuals. Together, these results show that the UPLC–MS/MS method is useful for a detailed MCM activity assay.
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This research was supported by a Grant-in-Aid for Research in Nagoya City University.
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Published in the topical collection New Applications of Mass Spectrometry in Biomedicine with guest editors Fumio Nomura, Mitsutoshi Setou, and Toshimitsu Niwa.
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Gotoh, K., Nakajima, Y., Tajima, G. et al. Assay for methylmalonyl coenzyme A mutase activity based on determination of succinyl coenzyme A by ultrahigh-performance liquid chromatography tandem mass spectrometry. Anal Bioanal Chem 407, 5281–5286 (2015). https://doi.org/10.1007/s00216-015-8753-8
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DOI: https://doi.org/10.1007/s00216-015-8753-8