Calib-RT: an open source python package for peptide retention time calibration in DIA mass spectrometry data.

Area of Science:

• Proteomics
• Mass Spectrometry
• Bioinformatics

Background:

• Data independent acquisition (DIA) mass spectrometry (MS) is a widely used proteomics technique.
• Accurate peptide identification in DIA-MS is challenging due to the loss of ion-to-spectrum correspondence.
• Retention time (RT) calibration is crucial for reducing false positive identifications by comparing estimated and measured RTs.

Purpose of the Study:

• To address the lack of engine-independent RT calibration toolkits in the DIA algorithm ecosystem.
• To introduce Calib-RT, a novel RT calibration method for DIA mass spectrometry.
• To enhance the accuracy of peptide identification in DIA-based proteomics.

Main Methods:

• Developed Calib-RT, a retention time calibration method specifically designed for DIA-MS data characteristics.
• The method performs nonlinear calibration adaptable to various data scales.
• Calib-RT demonstrates tolerance to noise interference, ensuring robust performance.

Main Results:

• Calib-RT provides a reliable and engine-independent solution for RT calibration in DIA proteomics.
• The tool facilitates accurate comparison of spectral library RTs with measured RTs.
• Successful implementation of nonlinear calibration across diverse data scales.

Conclusions:

• Calib-RT enriches the open-source DIA algorithm toolchain.
• The software assists in the development and improvement of DIA identification algorithms.
• Calib-RT is available as an open-source Python module on PyPi and GitHub.