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Incorporation characteristics of exogenous N-labeled thymidine, deoxyadenosine, deoxyguanosine and deoxycytidine into bacterial DNA

PLoS ONE, ISSN: 1932-6203, Vol: 15, Issue: 2, Page: e0229740
2020
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Article Description

Bacterial production has been often estimated from DNA synthesis rates by using tritium-labeled thymidine. Some bacteria species cannot incorporate extracellular thymidine into their DNA, suggesting their biomass production might be overlooked when using the conventional method. In the present study, to evaluate appropriateness of deoxyribonucleosides for evaluating bacterial production of natural bacterial communities from the viewpoint of DNA synthesis, incorporation rates of four deoxyribonucleosides (thymidine, deoxyadenosine, deoxyguanosine and deoxycytidine) labeled by nitrogen stable isotope (N) into bacterial DNA were examined in both ocean (Sagami Bay) and freshwater (Lake Kasumigaura) ecosystems in July 2015 and January 2016. In most stations in Sagami Bay and Lake Kasumigaura, we found that incorporation rates of deoxyguanosine were the highest among those of the four deoxyribonucleosides, and the incorporation rate of deoxyguanosine was approximately 2.5 times higher than that of thymidine. Whereas, incorporation rates of deoxyadenosine and deoxycytidine were 0.9 and 0.2 times higher than that of thymidine. These results clearly suggest that the numbers of bacterial species which can incorporate exogenous deoxyguanosine into their DNA are relatively greater as compared to the other deoxyribonucleosides, and measurement of bacterial production using deoxyguanosine more likely reflects larger numbers of bacterial species productions.

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http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85080062602&origin=inward; http://dx.doi.org/10.1371/journal.pone.0229740; http://www.ncbi.nlm.nih.gov/pubmed/32106263; https://dx.plos.org/10.1371/journal.pone.0229740.g004; http://dx.doi.org/10.1371/journal.pone.0229740.g004; https://dx.plos.org/10.1371/journal.pone.0229740.g005; http://dx.doi.org/10.1371/journal.pone.0229740.g005; https://dx.plos.org/10.1371/journal.pone.0229740.g003; http://dx.doi.org/10.1371/journal.pone.0229740.g003; https://dx.plos.org/10.1371/journal.pone.0229740.g002; http://dx.doi.org/10.1371/journal.pone.0229740.g002; https://dx.plos.org/10.1371/journal.pone.0229740; https://dx.plos.org/10.1371/journal.pone.0229740.t001; http://dx.doi.org/10.1371/journal.pone.0229740.t001; https://dx.plos.org/10.1371/journal.pone.0229740.g001; http://dx.doi.org/10.1371/journal.pone.0229740.g001; https://dx.doi.org/10.1371/journal.pone.0229740.g002; https://journals.plos.org/plosone/article/figure?id=10.1371/journal.pone.0229740.g002; https://dx.doi.org/10.1371/journal.pone.0229740.g004; https://journals.plos.org/plosone/article/figure?id=10.1371/journal.pone.0229740.g004; https://dx.doi.org/10.1371/journal.pone.0229740.g001; https://journals.plos.org/plosone/article/figure?id=10.1371/journal.pone.0229740.g001; https://dx.doi.org/10.1371/journal.pone.0229740.g003; https://journals.plos.org/plosone/article/figure?id=10.1371/journal.pone.0229740.g003; https://dx.doi.org/10.1371/journal.pone.0229740; https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0229740; https://dx.doi.org/10.1371/journal.pone.0229740.t001; https://journals.plos.org/plosone/article/figure?id=10.1371/journal.pone.0229740.t001; https://dx.doi.org/10.1371/journal.pone.0229740.g005; https://journals.plos.org/plosone/article/figure?id=10.1371/journal.pone.0229740.g005; https://journals.plos.org/plosone/article/file?id=10.1371/journal.pone.0229740&type=printable

Kenji Tsuchiya; Tomoharu Sano; Noriko Tomioka; Ayato Kohzu; Kazuhiro Komatsu; Ryuichiro Shinohara; Shinji Shimode; Tatsuki Toda; Akio Imai; Hideyuki Doi

Public Library of Science (PLoS)

Multidisciplinary

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