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Liu YM, Wang S, Dickenson A, Mao J, Bai X, Liao X. An on-line SPE-LC-MS/MS method for quantification of nucleobases and nucleosides present in biological fluids. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2024; 16:2505-2512. [PMID: 38584507 PMCID: PMC11151739 DOI: 10.1039/d4ay00100a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/09/2024]
Abstract
Solid phase extraction (SPE) and liquid chromatographic (LC) separation of nucleobases and nucleosides are challenging due to the high hydrophilicity of these compounds. Herein we report a novel on-line SPE-LC-MS/MS method for their quantification after pre-column derivatization with chloroacetaldehyde (CAA). The method proposed is selective and sensitive with limits of detection at the nano-molar level. Analysis of urine and saliva samples by using this method is demonstrated. Adenine, guanine, cytosine, adenosine, guanosine, and cytidine were found in the range from 0.19 (guanosine) to 1.83 μM (cytidine) in urine and from 0.015 (guanosine) to 0.79 μM (adenine) in saliva. Interestingly, methylation of cytidine was found to be significantly different in urine from that in saliva. While 5-hydroxymethylcytidine was detected at a very low level (<0.05 μM) in saliva, it was found to be the most prominent methylated cytidine in urine at a high level of 3.33 μM. Since on-line SPE is deployed, the proposed LC-MS/MS quantitative assay is convenient to carry out and offers good assay accuracy and repeatability.
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Affiliation(s)
- Yi-Ming Liu
- Department of Chemistry, Physics, and Atmospheric Science, Jackson State University, Jackson, MS 39217, USA.
| | - Shuguan Wang
- Department of Chemistry, Physics, and Atmospheric Science, Jackson State University, Jackson, MS 39217, USA.
| | - Amani Dickenson
- Department of Chemistry, Physics, and Atmospheric Science, Jackson State University, Jackson, MS 39217, USA.
| | - Jinghe Mao
- Department of Biology, Tougaloo College, Tougaloo, MS 39174, USA
| | - Xiaolin Bai
- Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China.
| | - Xun Liao
- Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China.
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Liao X, Bai X, Wang S, Liggins C, Pan L, Wang M, Tchounwou P, Mao J, Liu YM. A novel one-pot fluorescence tagging and depyrimidination strategy for quantification of global DNA methylation. Anal Chim Acta 2023; 1239:340636. [PMID: 36628742 PMCID: PMC9834644 DOI: 10.1016/j.aca.2022.340636] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Revised: 11/14/2022] [Accepted: 11/16/2022] [Indexed: 11/22/2022]
Abstract
DNA methylation is intensively studied in medical science. Current HPLC methods for quantification of global DNA methylation involve digestion of a DNA sample and HPLC determination of both cytosine (C) and 5-methylcytosine (5mC) so that percentage of 5mC in total cytosine can be calculated as DNA methylation level. Herein we report a novel HPLC method based on a one-pot fluorescence tagging and depyrimidination reaction between DNA and chloroacetaldehyde (CAA) for highly sensitive quantification of global DNA methylation. In the one-pot reaction, C and 5mC residues in a DNA sequence react with CAA, forming fluorescent etheno-adducts that are then released from the sequence through depyrimidination. Interestingly, etheno-5mC (ε-5mC) is ∼20 times more fluorescent than ε-C and other ε-nucleobases resulting from the reaction, which greatly facilitates the quantification. Further, due to the tagging-induced increase in structural aromaticity, ε-nucleobases are far more separable by HPLC than intact nucleobases. The proposed HPLC method with fluorescence detection (HPLC-FD) is quick (i.e., < 1h per assay) and highly sensitive with a detection limit of 0.80 nM (or 250 fg on column) for 5mC. Using the method, DNA samples isolated from yeast, HCT-116 cells, and tissues were analyzed. Global DNA methylation was measured to be in the range from 0.35% to 2.23% in the samples analyzed. This sensitive method allowed accurate analyses of minute DNA samples (∼100 ng) isolated from milligrams of tissues.
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Affiliation(s)
- Xun Liao
- Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, China
| | - Xiaolin Bai
- Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, China
| | - Shuguan Wang
- Department of Physics, Chemistry and Atmospheric Science, Jackson State University, Jackson, MS, 39217, USA
| | - Christany Liggins
- Department of Physics, Chemistry and Atmospheric Science, Jackson State University, Jackson, MS, 39217, USA
| | - Li Pan
- Department of Physics, Chemistry and Atmospheric Science, Jackson State University, Jackson, MS, 39217, USA
| | - Meiyuan Wang
- Department of Physics, Chemistry and Atmospheric Science, Jackson State University, Jackson, MS, 39217, USA
| | - Paul Tchounwou
- Department of Biology, Jackson State University, Jackson, MS, 39217, USA
| | - Jinghe Mao
- Department of Biology, Tougaloo College, Tugaloo, MS, 39174, USA
| | - Yi-Ming Liu
- Department of Physics, Chemistry and Atmospheric Science, Jackson State University, Jackson, MS, 39217, USA.
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Kohler I, Verhoeven M, Haselberg R, Gargano AF. Hydrophilic interaction chromatography – mass spectrometry for metabolomics and proteomics: state-of-the-art and current trends. Microchem J 2022. [DOI: 10.1016/j.microc.2021.106986] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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Németh K, Mészáros K, Szabó B, Butz H, Arányi T, Szabó PT. A relative quantitation method for measuring DNA methylation and hydroxymethylation using guanine as an internal standard. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2021; 13:4614-4622. [PMID: 34528637 DOI: 10.1039/d1ay00897h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Global DNA methylation and hydroxymethylation play an important role in gene expression. They can be connected with several diseases. The modification status could be a biomarker to determine the status of disease. A fast, easy and accurate liquid chromatography - tandem mass spectrometry method has been developed for the precise quantitation of 5-methylcytosine and 5-hydroxymethylcytosine. Formic acid was used for the hydrolysis of the DNA strand resulting in nucleobases. These polar hydrolysis products were separated on a normal phase column using reversed phase eluents in inverse gradient mode. Multiple reaction monitoring was applied to achieve high selectivity and sensitivity for the quantitation. A new relative quantitation model was developed by using guanine, as an internal standard, present in samples. The new method was successfully validated with excellent accuracy and precision values in the range of 0.005-0.5% for 5hmC and 1-15% for 5mC. The main advantages of this quantitation method are that, due to relative quantitation, calibration curves can be used without reacquiring the calibration points and no additional isotope labeled internal standards are required. The method was tested to identify the concentrations of 5mC and 5hmC in various sample types. The lowest level of DNA sample required in the case of 0.005% 5hmC is 0.5 μg.
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Affiliation(s)
- Krisztina Németh
- Institute of Chemistry, Eötvös Loránd University, Pázmány Péter stny. 1/A, H-1117 Budapest, Hungary
- MS Metabolomics Research Group, Centre for Structural Study, Research Centre for Natural Sciences, Eötvös Loránd Research Network, Magyar tudósok krt. 2, H-1117 Budapest, Hungary.
| | - Katalin Mészáros
- Hereditary Tumours Research Group, Eötvös Loránd Research Network, Semmelweis University, Szentkirályi u. 46, H-1088 Budapest, Hungary
| | - Borbála Szabó
- Department of Laboratory Medicine, Semmelweis University, Bókay János u. 53-54, H-1089 Budapest, Hungary
| | - Henriett Butz
- Hereditary Tumours Research Group, Eötvös Loránd Research Network, Semmelweis University, Szentkirályi u. 46, H-1088 Budapest, Hungary
- Department of Laboratory Medicine, Semmelweis University, Bókay János u. 53-54, H-1089 Budapest, Hungary
| | - Tamás Arányi
- Institute of Enzymology, Research Centre for Natural Sciences, Eötvös Loránd Research Network, Magyar tudósok krt. 2, H-1117 Budapest, Hungary
- Department of Molecular Biology, Semmelweis University, Tűzoltó u. 37-47, H-1094 Budapest, Hungary
| | - Pál T Szabó
- MS Metabolomics Research Group, Centre for Structural Study, Research Centre for Natural Sciences, Eötvös Loránd Research Network, Magyar tudósok krt. 2, H-1117 Budapest, Hungary.
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Burgos-Gil R, Peris-García E, Ruiz-Angel M, Baeza-Baeza J, García-Alvarez-Coque M. Protocol to compare column performance applied to hydrophilic interaction liquid chromatography. Microchem J 2019. [DOI: 10.1016/j.microc.2019.103973] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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