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mRNA pseudouridylation affects RNA metabolism in the parasite Toxoplasma gondii

RNA contains over 100 modified nucleotides that are created post-transcriptionally, among which pseudouridine (Ψ) is one of the most abundant. Although it was one of the first modifications discovered, the biological role of this modification is still not fully understood. Recently, we reported that...

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Autores principales: Nakamoto, Margaret A., Lovejoy, Alexander F., Cygan, Alicja M., Boothroyd, John C.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Cold Spring Harbor Laboratory Press 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5689004/
https://www.ncbi.nlm.nih.gov/pubmed/28851751
http://dx.doi.org/10.1261/rna.062794.117
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author Nakamoto, Margaret A.
Lovejoy, Alexander F.
Cygan, Alicja M.
Boothroyd, John C.
author_facet Nakamoto, Margaret A.
Lovejoy, Alexander F.
Cygan, Alicja M.
Boothroyd, John C.
author_sort Nakamoto, Margaret A.
collection PubMed
description RNA contains over 100 modified nucleotides that are created post-transcriptionally, among which pseudouridine (Ψ) is one of the most abundant. Although it was one of the first modifications discovered, the biological role of this modification is still not fully understood. Recently, we reported that a pseudouridine synthase (TgPUS1) is necessary for differentiation of the single-celled eukaryotic parasite Toxoplasma gondii from active to chronic infection. To better understand the biological role of pseudouridylation, we report here gel-based and deep-sequencing methods to identify TgPUS1-dependent Ψ’s in Toxoplasma RNA, and the use of TgPUS1 mutants to examine the effect of this modification on mRNAs. In addition to identifying conserved sites of pseudouridylation in Toxoplasma rRNA, tRNA, and snRNA, we also report extensive pseudouridylation of Toxoplasma mRNAs, with the Ψ’s being relatively depleted in the 3′-UTR but enriched at position 1 of codons. We show that many Ψ’s in tRNA and mRNA are dependent on the action of TgPUS1 and that TgPUS1-dependent mRNA Ψ’s are enriched in developmentally regulated transcripts. RNA-seq data obtained from wild-type and TgPUS1-mutant parasites shows that genes containing a TgPUS1-dependent Ψ are relatively more abundant in mutant parasites, while pulse/chase labeling of RNA with 4-thiouracil shows that mRNAs containing TgPUS1-dependent Ψ have a modest but statistically significant increase in half-life in the mutant parasites. These data are some of the first evidence suggesting that mRNA Ψ’s play an important biological role.
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spelling pubmed-56890042018-12-01 mRNA pseudouridylation affects RNA metabolism in the parasite Toxoplasma gondii Nakamoto, Margaret A. Lovejoy, Alexander F. Cygan, Alicja M. Boothroyd, John C. RNA Article RNA contains over 100 modified nucleotides that are created post-transcriptionally, among which pseudouridine (Ψ) is one of the most abundant. Although it was one of the first modifications discovered, the biological role of this modification is still not fully understood. Recently, we reported that a pseudouridine synthase (TgPUS1) is necessary for differentiation of the single-celled eukaryotic parasite Toxoplasma gondii from active to chronic infection. To better understand the biological role of pseudouridylation, we report here gel-based and deep-sequencing methods to identify TgPUS1-dependent Ψ’s in Toxoplasma RNA, and the use of TgPUS1 mutants to examine the effect of this modification on mRNAs. In addition to identifying conserved sites of pseudouridylation in Toxoplasma rRNA, tRNA, and snRNA, we also report extensive pseudouridylation of Toxoplasma mRNAs, with the Ψ’s being relatively depleted in the 3′-UTR but enriched at position 1 of codons. We show that many Ψ’s in tRNA and mRNA are dependent on the action of TgPUS1 and that TgPUS1-dependent mRNA Ψ’s are enriched in developmentally regulated transcripts. RNA-seq data obtained from wild-type and TgPUS1-mutant parasites shows that genes containing a TgPUS1-dependent Ψ are relatively more abundant in mutant parasites, while pulse/chase labeling of RNA with 4-thiouracil shows that mRNAs containing TgPUS1-dependent Ψ have a modest but statistically significant increase in half-life in the mutant parasites. These data are some of the first evidence suggesting that mRNA Ψ’s play an important biological role. Cold Spring Harbor Laboratory Press 2017-12 /pmc/articles/PMC5689004/ /pubmed/28851751 http://dx.doi.org/10.1261/rna.062794.117 Text en © 2017 Nakamoto et al.; Published by Cold Spring Harbor Laboratory Press for the RNA Society http://creativecommons.org/licenses/by-nc/4.0/ This article is distributed exclusively by the RNA Society for the first 12 months after the full-issue publication date (see http://rnajournal.cshlp.org/site/misc/terms.xhtml). After 12 months, it is available under a Creative Commons License (Attribution-NonCommercial 4.0 International), as described at http://creativecommons.org/licenses/by-nc/4.0/.
spellingShingle Article
Nakamoto, Margaret A.
Lovejoy, Alexander F.
Cygan, Alicja M.
Boothroyd, John C.
mRNA pseudouridylation affects RNA metabolism in the parasite Toxoplasma gondii
title mRNA pseudouridylation affects RNA metabolism in the parasite Toxoplasma gondii
title_full mRNA pseudouridylation affects RNA metabolism in the parasite Toxoplasma gondii
title_fullStr mRNA pseudouridylation affects RNA metabolism in the parasite Toxoplasma gondii
title_full_unstemmed mRNA pseudouridylation affects RNA metabolism in the parasite Toxoplasma gondii
title_short mRNA pseudouridylation affects RNA metabolism in the parasite Toxoplasma gondii
title_sort mrna pseudouridylation affects rna metabolism in the parasite toxoplasma gondii
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5689004/
https://www.ncbi.nlm.nih.gov/pubmed/28851751
http://dx.doi.org/10.1261/rna.062794.117
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