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Clinical Chemistry 45: 1157-1161, 1999;
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(Clinical Chemistry. 1999;45:1157-1161.)
© 1999 American Association for Clinical Chemistry, Inc.

Articles

Four Common Mutations of the Cystathionine ß-Synthase Gene Detected by Multiplex PCR and Matrix-assisted Laser Desorption/Ionization Time-of-Flight Mass Spectrometry

Angela Harksen, Per Magne Ueland, Helga Refsum and Klaus Meyera

Department of Pharmacology, University of Bergen, Armauer Hansens Hus, 5021 Bergen, Norway.
a Author for correspondence. Fax 47-55-974605; e-mail klaus.meyer{at}farm.uib.no

Background: A deficiency of cystathionine ß-synthase (CBS) is the most frequent cause of homocystinuria. The effect of therapy is related to the underlying CBS genotype, which makes early diagnosis of this genetic defect important. Our aim was to develop a fast and reliable method based on matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) mass spectrometry for the determination of common mutations of the CBS gene.

Methods: We used MALDI-TOF mass spectrometry to detect four common CBS mutations (G307S, T272M, I278T, and V320A). The method is based on multiplex PCR of exons 7, 8, and 9, followed by single nucleotide extension in the presence of dideoxy NTPs of four primers targeted at the separate mutation sites. The extension products, as well as the 3-hydroxypicolinic acid matrix, were incubated with cation-exchange beads to remove disturbing salt contaminants.

Results: The above-mentioned mutations were determined in samples from 12 homocystinuria patients. The MALDI-TOF spectra allowed unambiguous discrimination between primers and extension products (>9 Da) in the mass range between 4500 and 7500 Da. No labeled primers or ddNTPs were required. The genotyping was verified by reference technique.

Conclusion: Our results demonstrate fast, simple, and unambiguous multiplex genotyping of four common CBS mutations by MALDI-TOF mass spectrometry.© 1999 American Association for Clinical Chemistry




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