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Design of high-oleic tobacco (Nicotiana tabacum L.) seed oil by CRISPR-Cas9-mediated knockout of NtFAD2–2
BACKGROUND: Tobacco seed oil could be used as an appropriate feedstock for biodiesel production. However, the high linoleic acid content of tobacco seed oil makes it susceptible to oxidation. Altering the fatty acid profile by increasing the content of oleic acid could improve the properties of biod...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
BioMed Central
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7249356/ https://www.ncbi.nlm.nih.gov/pubmed/32450806 http://dx.doi.org/10.1186/s12870-020-02441-0 |
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author | Tian, Yinshuai Chen, Kai Li, Xiao Zheng, Yunpu Chen, Fang |
author_facet | Tian, Yinshuai Chen, Kai Li, Xiao Zheng, Yunpu Chen, Fang |
author_sort | Tian, Yinshuai |
collection | PubMed |
description | BACKGROUND: Tobacco seed oil could be used as an appropriate feedstock for biodiesel production. However, the high linoleic acid content of tobacco seed oil makes it susceptible to oxidation. Altering the fatty acid profile by increasing the content of oleic acid could improve the properties of biodiesel produced from tobacco seed oil. RESULTS: Four FAD2 genes, NtFAD2–1a, NtFAD2–1b, NtFAD2–2a, and NtFAD2–2b, were identified in allotetraploid tobacco genome. Phylogenetic analysis of protein sequences showed that NtFAD2–1a and NtFAD2–2a originated from N. tomentosiformis, while NtFAD2–1b and NtFAD2–2b from N. sylvestris. Expression analysis revealed that NtFAD2–2a and NtFAD2–2b transcripts were more abundant in developing seeds than in other tissues, while NtFAD2–1a and NtFAD2–1b showed low transcript levels in developing seed. Phylogenic analysis showed that NtFAD2–2a and NtFAD2–2b were seed-type FAD2 genes. Heterologous expression in yeast cells demonstrated that both NtFAD2–2a and NtFAD2–2b protein could introduce a double bond at the Δ(12) position of fatty acid chain. The fatty acid profile analysis of tobacco fad2–2 mutant seeds derived from CRISPR-Cas9 edited plants showed dramatic increase of oleic acid content from 11% to over 79%, whereas linoleic acid decreased from 72 to 7%. In addition, the fatty acid composition of leaf was not affected in fad2–2 mutant plants. CONCLUSION: Our data showed that knockout of seed-type FAD2 genes in tobacco could significantly increase the oleic acid content in seed oil. This research suggests that CRISPR-Cas9 system offers a rapid and highly efficient method in the tobacco seed lipid engineering programs. |
format | Online Article Text |
id | pubmed-7249356 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | BioMed Central |
record_format | MEDLINE/PubMed |
spelling | pubmed-72493562020-06-04 Design of high-oleic tobacco (Nicotiana tabacum L.) seed oil by CRISPR-Cas9-mediated knockout of NtFAD2–2 Tian, Yinshuai Chen, Kai Li, Xiao Zheng, Yunpu Chen, Fang BMC Plant Biol Research Article BACKGROUND: Tobacco seed oil could be used as an appropriate feedstock for biodiesel production. However, the high linoleic acid content of tobacco seed oil makes it susceptible to oxidation. Altering the fatty acid profile by increasing the content of oleic acid could improve the properties of biodiesel produced from tobacco seed oil. RESULTS: Four FAD2 genes, NtFAD2–1a, NtFAD2–1b, NtFAD2–2a, and NtFAD2–2b, were identified in allotetraploid tobacco genome. Phylogenetic analysis of protein sequences showed that NtFAD2–1a and NtFAD2–2a originated from N. tomentosiformis, while NtFAD2–1b and NtFAD2–2b from N. sylvestris. Expression analysis revealed that NtFAD2–2a and NtFAD2–2b transcripts were more abundant in developing seeds than in other tissues, while NtFAD2–1a and NtFAD2–1b showed low transcript levels in developing seed. Phylogenic analysis showed that NtFAD2–2a and NtFAD2–2b were seed-type FAD2 genes. Heterologous expression in yeast cells demonstrated that both NtFAD2–2a and NtFAD2–2b protein could introduce a double bond at the Δ(12) position of fatty acid chain. The fatty acid profile analysis of tobacco fad2–2 mutant seeds derived from CRISPR-Cas9 edited plants showed dramatic increase of oleic acid content from 11% to over 79%, whereas linoleic acid decreased from 72 to 7%. In addition, the fatty acid composition of leaf was not affected in fad2–2 mutant plants. CONCLUSION: Our data showed that knockout of seed-type FAD2 genes in tobacco could significantly increase the oleic acid content in seed oil. This research suggests that CRISPR-Cas9 system offers a rapid and highly efficient method in the tobacco seed lipid engineering programs. BioMed Central 2020-05-25 /pmc/articles/PMC7249356/ /pubmed/32450806 http://dx.doi.org/10.1186/s12870-020-02441-0 Text en © The Author(s) 2020 Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data. |
spellingShingle | Research Article Tian, Yinshuai Chen, Kai Li, Xiao Zheng, Yunpu Chen, Fang Design of high-oleic tobacco (Nicotiana tabacum L.) seed oil by CRISPR-Cas9-mediated knockout of NtFAD2–2 |
title | Design of high-oleic tobacco (Nicotiana tabacum L.) seed oil by CRISPR-Cas9-mediated knockout of NtFAD2–2 |
title_full | Design of high-oleic tobacco (Nicotiana tabacum L.) seed oil by CRISPR-Cas9-mediated knockout of NtFAD2–2 |
title_fullStr | Design of high-oleic tobacco (Nicotiana tabacum L.) seed oil by CRISPR-Cas9-mediated knockout of NtFAD2–2 |
title_full_unstemmed | Design of high-oleic tobacco (Nicotiana tabacum L.) seed oil by CRISPR-Cas9-mediated knockout of NtFAD2–2 |
title_short | Design of high-oleic tobacco (Nicotiana tabacum L.) seed oil by CRISPR-Cas9-mediated knockout of NtFAD2–2 |
title_sort | design of high-oleic tobacco (nicotiana tabacum l.) seed oil by crispr-cas9-mediated knockout of ntfad2–2 |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7249356/ https://www.ncbi.nlm.nih.gov/pubmed/32450806 http://dx.doi.org/10.1186/s12870-020-02441-0 |
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