Strategies to Avoid Artifacts in Mass Spectrometry-Based Epitranscriptome Analyses.

Strategies to Avoid Artifacts in Mass Spectrometry-Based Epitranscriptome Analyses.
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DOI:
10.1002/anie.202106215
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发表时间:
2021-10-25
期刊:
Angewandte Chemie (International ed. in English)
影响因子:
--
通讯作者:
Kellner S
Kellner S
中科院分区:
其他
文献类型:
--
作者:
Kaiser S;Byrne SR;Ammann G;Asadi Atoi P;Borland K;Brecheisen R;DeMott MS;Gehrke T;Hagelskamp F;Heiss M;Yoluç Y;Liu L;Zhang Q;Dedon PC;Cao B;Kellner S

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In this report, we perform structure validation of recently reported RNA phosphorothioate (PT) modifications, a new set of epitranscriptome marks found in bacteria and eukaryotes including humans. By comparing synthetic PT‐containing diribonucleotides with native species in RNA hydrolysates by high‐resolution mass spectrometry (MS), metabolic stable isotope labeling, and PT‐specific iodine‐desulfurization, we disprove the existence of PTs in RNA from E. coli, S. cerevisiae, human cell lines, and mouse brain. Furthermore, we discuss how an MS artifact led to the initial misidentification of 2′‐O‐methylated diribonucleotides as RNA phosphorothioates. To aid structure validation of new nucleic acid modifications, we present a detailed guideline for MS analysis of RNA hydrolysates, emphasizing how the chosen RNA hydrolysis protocol can be a decisive factor in discovering and quantifying RNA modifications in biological samples. For discovery of novel RNA modifications, a stringent workflow for structure validation is necessary to avoid misinterpretation of artifacts. The comparison of the synthetic standard to the native compound's retention time, full mass spectrum, high‐resolution mass spectrum and metabolic isotope labeling allow for confident identification of RNA modifications.
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