An Improved Target-decoy Strategy for Evaluation of Database Search Engines and Quality Control Methods in Shotgun Proteomics

DOI

10.2991/bbe-16.2016.56How to use a DOI?

Keywords

Proteomics, Tandem mass spectrometry, Entrapment sequences method, Target-decoy, Quality control.

Abstract

With the advance of mass spectrometry and experimental techniques, proteome research has broken through the bottleneck of data generation, and a huge amount of mass spectrometry (MS) data has been accumulated rapidly in the past few years. Meanwhile, the lack of efficient data analysis and quality control methods has greatly hindered proteome development. Target-decoy searching strategy has become one of the most popular strategies to control the false identification in MS/MS data analysis. While this strategy can estimate the false discovery rate (FDR) within a dataset, it cannot directly evaluate the false positive matches in target identifications. In this study, we developed an improved target-decoy strategy: the entrapment sequences method, to set up an objective standard to evaluate the performance of quality control methods and database search tools. We started with a preliminary study of the size of entrapment sequences and found ten times the sample sequences could be a reasonable size of entrapment sequences. Then,we went on to give thedefinition and equation of Estimated FDR and Actual FDR. We found the entrapment sequences method can be a good supplement to target-decoy strategy.

Copyright

© 2016, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

Download article (PDF)

TY  - CONF
AU  - Xiaodong Feng
AU  - Jie Ma
AU  - Cheng Chang
AU  - Kunxian Shu
AU  - Yunping Zhu
PY  - 2016/07
DA  - 2016/07
TI  - An Improved Target-decoy Strategy for Evaluation of Database Search Engines and Quality Control Methods in Shotgun Proteomics
BT  - Proceedings of the 2016 International Conference on Biomedical and Biological Engineering
PB  - Atlantis Press
SP  - 366
EP  - 372
SN  - 2468-5747
UR  - https://doi.org/10.2991/bbe-16.2016.56
DO  - 10.2991/bbe-16.2016.56
ID  - Feng2016/07
ER  -