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Next-generation metabolic screening: targeted and untargeted metabolomics for the diagnosis of inborn errors of metabolism in individual patients.

Abstract：

:The implementation of whole-exome sequencing in clinical diagnostics has generated a need for functional evaluation of genetic variants. In the field of inborn errors of metabolism (IEM), a diverse spectrum of targeted biochemical assays is employed to analyze a limited amount of metabolites. We now present a single-platform, high-resolution liquid chromatography quadrupole time of flight (LC-QTOF) method that can be applied for holistic metabolic profiling in plasma of individual IEM-suspected patients. This method, which we termed "next-generation metabolic screening" (NGMS), can detect >10,000 features in each sample. In the NGMS workflow, features identified in patient and control samples are aligned using the "various forms of chromatography mass spectrometry (XCMS)" software package. Subsequently, all features are annotated using the Human Metabolome Database, and statistical testing is performed to identify significantly perturbed metabolite concentrations in a patient sample compared with controls. We propose three main modalities to analyze complex, untargeted metabolomics data. First, a targeted evaluation can be done based on identified genetic variants of uncertain significance in metabolic pathways. Second, we developed a panel of IEM-related metabolites to filter untargeted metabolomics data. Based on this IEM-panel approach, we provided the correct diagnosis for 42 of 46 IEMs. As a last modality, metabolomics data can be analyzed in an untargeted setting, which we term "open the metabolome" analysis. This approach identifies potential novel biomarkers in known IEMs and leads to identification of biomarkers for as yet unknown IEMs. We are convinced that NGMS is the way forward in laboratory diagnostics of IEMs.

journal_name

J Inherit Metab Dis

journal_title

Journal of inherited metabolic disease

authors

Coene KLM,Kluijtmans LAJ,van der Heeft E,Engelke UFH,de Boer S,Hoegen B,Kwast HJT,van de Vorst M,Huigen MCDG,Keularts IMLW,Schreuder MF,van Karnebeek CDM,Wortmann SB,de Vries MC,Janssen MCH,Gilissen C,Engel J,Wevers RA

doi

10.1007/s10545-017-0131-6

subject

Has Abstract

pub_date

2018-05-01 00:00:00

pages

337-353

issue

eissn

0141-8955

issn

1573-2665

pii

10.1007/s10545-017-0131-6

journal_volume

pub_type

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Next-generation metabolic screening: targeted and untargeted metabolomics for the diagnosis of inborn errors of metabolism in individual patients.