Improved Small Molecule Identification through Learning Combinations of Kernel Regression Models

Metabolites
Céline BrouardJuho Rousu

Abstract

In small molecule identification from tandem mass (MS/MS) spectra, input-output kernel regression (IOKR) currently provides the state-of-the-art combination of fast training and prediction and high identification rates. The IOKR approach can be simply understood as predicting a fingerprint vector from the MS/MS spectrum of the unknown molecule, and solving a pre-image problem to find the molecule with the most similar fingerprint. In this paper, we bring forward the following improvements to the IOKR framework: firstly, we formulate the IOKRreverse model that can be understood as mapping molecular structures into the MS/MS feature space and solving a pre-image problem to find the molecule whose predicted spectrum is the closest to the input MS/MS spectrum. Secondly, we introduce an approach to combine several IOKR and IOKRreverse models computed from different input and output kernels, called IOKRfusion. The method is based on minimizing structured Hinge loss of the combined model using a mini-batch stochastic subgradient optimization. Our experiments show a consistent improvement of top-k accuracy both in positive and negative ionization mode data.

References

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Citations

Jun 18, 2020·Metabolites·Ulf W LiebalLars M Blank
Mar 12, 2021·Emerging Topics in Life Sciences·Sophie Alvarez, Michael J Naldrett
Mar 25, 2021·Briefings in Bioinformatics·Christoph A Krettler, Gerhard G Thallinger
May 13, 2021·Chemical Reviews·Ricardo M BorgesRyan S Renslow
May 7, 2021·Rapid Communications in Mass Spectrometry : RCM·Youzhong LiuWouter Heyndrickx
Jul 6, 2021·Frontiers in Molecular Biosciences·Hayat Ali ShahJing Feng

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Software Mentioned

Chemistry Development Kit ( CDK )
ADAPTIVE
IOKRfusion
FingerID
ALIGNF
SIRIUS
IOKR
SIMPLE
Unimkl
IOKRreverse

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