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• W2912046117 abstract "RATIONALE: Histone PTMs play key roles in regulating eukaryotic gene expression. Mass spectrometry (MS) has emerged as a powerful method to characterize and quantify histone PTMs as it allows unbiased identification and quantification of multiple histone PTMs including combinations of the modifications present. METHODS: In this study we compared a range of data acquisition methods for the identification and quantification of the histone PTMs using a Q Exactive HF Orbitrap. We compared three different data-dependent analysis (DDA) methods with MS2 resolutions of 120K, 60K, 30K. We also compared a range of data-independent analysis (DIA) methods using MS2 isolation windows of 20 m/z and DIAvw to identify and quantify histone PTMs in Chinese Hamster Ovary (CHO) cells. RESULTS: The increased number of MS2 scans afforded by the lower resolution methods resulted in a higher number of queries, peptide sequence matches (PSMs) and a higher number of peptide proteoforms with a Mascot Ion score greater than 46. No difference in the proportion of peptide proteoforms with Delta scores >17 was observed. Comparing the data acquisition methods increased repeatability in terms of lower CVs afforded by DIA MS1 60K MS2 30K 20m/z isolation windows was observed. CONCLUSION: We observed that DIA which offers advantages in flexibility and identification of isobaric peptide proteoforms performs as well as DDA in the analysis of histone PTMs. We were able to identify 71 modified histone peptides for histone H3 and H4 and quantified 64 across each of the different acquisition methods." @default.
• W2912046117 created "2019-02-21" @default.
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• W2912046117 date "2019-04-26" @default.
• W2912046117 modified "2023-10-13" @default.
• W2912046117 title "Comparison of data‐acquisition methods for the identification and quantification of histone post‐translational modifications on a Q Exactive HF hybrid quadrupole Orbitrap mass spectrometer" @default.
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• W2912046117 doi "https://doi.org/10.1002/rcm.8401" @default.
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