LSM-MS2: A Foundation Model Bridging Spectral Identification and Biological Interpretation

TL;DR

LSM-MS2 is a large-scale deep learning model that significantly improves spectral identification accuracy and enables biological interpretation of mass spectrometry data, advancing untapped chemical and biological insights.

Contribution

The paper introduces LSM-MS2, a novel foundation model trained on millions of spectra that enhances spectral identification and facilitates biological interpretation from minimal data.

Findings

30% improvement in spectral identification accuracy

42% more correct identifications in complex samples

Effective differentiation of disease states and clinical outcome prediction

Abstract

A vast majority of mass spectrometry data remains uncharacterized, leaving much of its biological and chemical information untapped. Recent advances in machine learning have begun to address this gap, particularly for tasks such as spectral identification in tandem mass spectrometry data. Here, we present the latest generation of LSM-MS2, a large-scale deep learning foundation model trained on millions of spectra to learn a semantic chemical space. LSM-MS2 achieves state-of-the-art performance in spectral identification, improving on existing methods by 30% in accuracy of identifying challenging isomeric compounds, yielding 42% more correct identifications in complex biological samples, and maintaining robustness under low-concentration conditions. Furthermore, LSM-MS2 produces rich spectral embeddings that enable direct biological interpretation from minimal downstream data, successfully differentiating disease states and predicting clinical outcomes across diverse translational applications.