Pollen-Specific CRISPR/Cas9 System to Increase Heritable Gene Mutations in Maize
The CRISPR/Cas9 system has been widely utilized in plant biotechnology as a gene editing tool. However, a conventional design with ubiquitously expressed CRISPR/Cas9 was observed to cause large numbers of somatic mutations that complicated the identification of heritable mutations. We constructed a...
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MDPI AG
2021-08-01
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| Series: | Agriculture |
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| author | Changshuang Jing Min Wei Peng Fang Rentao Song Weiwei Qi |
| author_facet | Changshuang Jing Min Wei Peng Fang Rentao Song Weiwei Qi |
| author_sort | Changshuang Jing |
| collection | DOAJ |
| description | The CRISPR/Cas9 system has been widely utilized in plant biotechnology as a gene editing tool. However, a conventional design with ubiquitously expressed CRISPR/Cas9 was observed to cause large numbers of somatic mutations that complicated the identification of heritable mutations. We constructed a pollen-specific CRISPR/Cas9 (PSC) system using pollen-specific promoters of maize <i>Profilin 1</i> and <i>Profilin 3</i> (pZmPRO1 and pZmPRO3) to drive <i>Cas9</i> expression, and the bZIP transcription factor <i>Opaque2</i> (<i>O2</i>) was employed as the target gene. The maize ubiquitin promoter (pZmUbi)-driven CRISPR/Cas9 (UC) system was employed as a control. We generated transgenic plants for the PSC and UC systems and analyzed three independent events for each system. We found that the pZmPRO1 PSC system generated no target gene mutations in the T0 generation but successfully generated 0–90% target gene mutations in the T1 generation. A total of 31 of 33 mutations in the T1 generation could be inherited in the T2 generation. In addition, 88.9–97.3% of T2 mutations were from the T1 generation. The UC system generated mutations in the T0 generation, and 0%, 50% and 92.9% of T1 mutations were from the T0 generation. Our results demonstrate that the PSC system provided stable, heritable mutants in the next generation, and this approach might also be applied in other crops using germinal cell-specific CRISPR/Cas9 systems to facilitate plant breeding. |
| first_indexed | 2024-03-10T09:06:23Z |
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| institution | Directory Open Access Journal |
| issn | 2077-0472 |
| language | English |
| last_indexed | 2024-03-10T09:06:23Z |
| publishDate | 2021-08-01 |
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| series | Agriculture |
| spelling | doaj.art-84fa37f1f374437e93c95d314c7db1272023-11-22T06:23:09ZengMDPI AGAgriculture2077-04722021-08-0111875110.3390/agriculture11080751Pollen-Specific CRISPR/Cas9 System to Increase Heritable Gene Mutations in MaizeChangshuang Jing0Min Wei1Peng Fang2Rentao Song3Weiwei Qi4Shanghai Key Laboratory of Bio-Energy Crops, School of Life Sciences, Shanghai University, Shanghai 200444, ChinaShanghai Key Laboratory of Bio-Energy Crops, School of Life Sciences, Shanghai University, Shanghai 200444, ChinaShanghai Key Laboratory of Bio-Energy Crops, School of Life Sciences, Shanghai University, Shanghai 200444, ChinaState Key Laboratory of Plant Physiology and Biochemistry, National Maize Improvement Center, College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, ChinaShanghai Key Laboratory of Bio-Energy Crops, School of Life Sciences, Shanghai University, Shanghai 200444, ChinaThe CRISPR/Cas9 system has been widely utilized in plant biotechnology as a gene editing tool. However, a conventional design with ubiquitously expressed CRISPR/Cas9 was observed to cause large numbers of somatic mutations that complicated the identification of heritable mutations. We constructed a pollen-specific CRISPR/Cas9 (PSC) system using pollen-specific promoters of maize <i>Profilin 1</i> and <i>Profilin 3</i> (pZmPRO1 and pZmPRO3) to drive <i>Cas9</i> expression, and the bZIP transcription factor <i>Opaque2</i> (<i>O2</i>) was employed as the target gene. The maize ubiquitin promoter (pZmUbi)-driven CRISPR/Cas9 (UC) system was employed as a control. We generated transgenic plants for the PSC and UC systems and analyzed three independent events for each system. We found that the pZmPRO1 PSC system generated no target gene mutations in the T0 generation but successfully generated 0–90% target gene mutations in the T1 generation. A total of 31 of 33 mutations in the T1 generation could be inherited in the T2 generation. In addition, 88.9–97.3% of T2 mutations were from the T1 generation. The UC system generated mutations in the T0 generation, and 0%, 50% and 92.9% of T1 mutations were from the T0 generation. Our results demonstrate that the PSC system provided stable, heritable mutants in the next generation, and this approach might also be applied in other crops using germinal cell-specific CRISPR/Cas9 systems to facilitate plant breeding.https://www.mdpi.com/2077-0472/11/8/751CRISPR/Cas9pollen-specificheritable gene mutationmaize |
| spellingShingle | Changshuang Jing Min Wei Peng Fang Rentao Song Weiwei Qi Pollen-Specific CRISPR/Cas9 System to Increase Heritable Gene Mutations in Maize Agriculture CRISPR/Cas9 pollen-specific heritable gene mutation maize |
| title | Pollen-Specific CRISPR/Cas9 System to Increase Heritable Gene Mutations in Maize |
| title_full | Pollen-Specific CRISPR/Cas9 System to Increase Heritable Gene Mutations in Maize |
| title_fullStr | Pollen-Specific CRISPR/Cas9 System to Increase Heritable Gene Mutations in Maize |
| title_full_unstemmed | Pollen-Specific CRISPR/Cas9 System to Increase Heritable Gene Mutations in Maize |
| title_short | Pollen-Specific CRISPR/Cas9 System to Increase Heritable Gene Mutations in Maize |
| title_sort | pollen specific crispr cas9 system to increase heritable gene mutations in maize |
| topic | CRISPR/Cas9 pollen-specific heritable gene mutation maize |
| url | https://www.mdpi.com/2077-0472/11/8/751 |
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