1
|
Zaidi MA, O'Leary SJB, Wu S, Chabot D, Gleddie S, Laroche A, Eudes F, Robert LS. Investigating Triticeae anther gene promoter activity in transgenic Brachypodium distachyon. PLANTA 2017; 245:385-396. [PMID: 27787603 DOI: 10.1007/s00425-016-2612-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/09/2016] [Accepted: 10/18/2016] [Indexed: 06/06/2023]
Abstract
In this report, we demonstrate that Brachypodium distachyon could serve as a relatively high throughput in planta functional assay system for Triticeae anther-specific gene promoters. There remains a vast gap in our knowledge of the promoter cis-acting elements responsible for the transcriptional regulation of Triticeae anther-specific genes. In an attempt to identify conserved cis-elements, 14 pollen-specific and 8 tapetum-specific Triticeae putative promoter sequences were analyzed using different promoter sequence analysis tools. Several cis-elements were found to be enriched in these sequences and their possible role in gene expression regulation in the anther is discussed. Despite the fact that potential cis-acting elements can be identified within putative promoter sequence datasets, determining whether particular promoter sequences can in fact direct proper tissue-specific and developmental gene expression still needs to be confirmed via functional assays preferably performed in closely related plants. Transgenic functional assays with Triticeae species remain challenging and Brachypodium distachyon may represent a suitable alternative. The promoters of the triticale pollen-specific genes group 3 pollen allergen (PAL3) and group 4 pollen allergen (PAL4), as well as the tapetum-specific genes chalcone synthase-like 1 (CHSL1), from wheat and cysteine-rich protein 1 (CRP1) from triticale were fused to the green fluorescent protein gene (GFP) and analyzed in transgenic Brachypodium. This report demonstrates that this model species could serve to accelerate the functional analysis of Triticeae anther-specific gene promoters.
Collapse
Affiliation(s)
- Mohsin A Zaidi
- Agriculture and Agri-Food Canada, Ottawa Research and Development Centre, 960 Carling Avenue, Ottawa, ON, K1A 0C6, Canada
| | - Stephen J B O'Leary
- Agriculture and Agri-Food Canada, Ottawa Research and Development Centre, 960 Carling Avenue, Ottawa, ON, K1A 0C6, Canada
- National Research Council of Canada, Aquatic and Crop Resource Development, 1411 Oxford Street, Halifax, NS, B3H 3Z1, Canada
| | - Shaobo Wu
- Agriculture and Agri-Food Canada, Ottawa Research and Development Centre, 960 Carling Avenue, Ottawa, ON, K1A 0C6, Canada
- Beijing YouAn Hospital, Capital Medical University, Beijing Institute of Hepatology, No. 8 Xi Tou Tiao, You An Men Wai, Fengtai District, Beijing, 100069, People's Republic of China
| | - Denise Chabot
- Agriculture and Agri-Food Canada, Ottawa Research and Development Centre, 960 Carling Avenue, Ottawa, ON, K1A 0C6, Canada
| | - Steve Gleddie
- Agriculture and Agri-Food Canada, Ottawa Research and Development Centre, 960 Carling Avenue, Ottawa, ON, K1A 0C6, Canada
| | - André Laroche
- Agriculture and Agri-Food Canada, Lethbridge Research and Development Centre, Lethbridge, AB, T1J 4B1, Canada
| | - François Eudes
- Agriculture and Agri-Food Canada, Lethbridge Research and Development Centre, Lethbridge, AB, T1J 4B1, Canada
| | - Laurian S Robert
- Agriculture and Agri-Food Canada, Ottawa Research and Development Centre, 960 Carling Avenue, Ottawa, ON, K1A 0C6, Canada.
| |
Collapse
|
2
|
Wang R, Zhu M, Ye R, Liu Z, Zhou F, Chen H, Lin Y. Novel green tissue-specific synthetic promoters and cis-regulatory elements in rice. Sci Rep 2015; 5:18256. [PMID: 26655679 PMCID: PMC4676006 DOI: 10.1038/srep18256] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2015] [Accepted: 11/16/2015] [Indexed: 02/02/2023] Open
Abstract
As an important part of synthetic biology, synthetic promoter has gradually become a hotspot in current biology. The purposes of the present study were to synthesize green tissue-specific promoters and to discover green tissue-specific cis-elements. We first assembled several regulatory sequences related to tissue-specific expression in different combinations, aiming to obtain novel green tissue-specific synthetic promoters. GUS assays of the transgenic plants indicated 5 synthetic promoters showed green tissue-specific expression patterns and different expression efficiencies in various tissues. Subsequently, we scanned and counted the cis-elements in different tissue-specific promoters based on the plant cis-elements database PLACE and the rice cDNA microarray database CREP for green tissue-specific cis-element discovery, resulting in 10 potential cis-elements. The flanking sequence of one potential core element (GEAT) was predicted by bioinformatics. Then, the combination of GEAT and its flanking sequence was functionally identified with synthetic promoter. GUS assays of the transgenic plants proved its green tissue-specificity. Furthermore, the function of GEAT flanking sequence was analyzed in detail with site-directed mutagenesis. Our study provides an example for the synthesis of rice tissue-specific promoters and develops a feasible method for screening and functional identification of tissue-specific cis-elements with their flanking sequences at the genome-wide level in rice.
Collapse
Affiliation(s)
- Rui Wang
- National Key Laboratory of Crop Genetic Improvement and National Centre of Plant Gene Research, Huazhong Agricultural University, Wuhan, China
| | - Menglin Zhu
- National Key Laboratory of Crop Genetic Improvement and National Centre of Plant Gene Research, Huazhong Agricultural University, Wuhan, China
| | - Rongjian Ye
- National Key Laboratory of Crop Genetic Improvement and National Centre of Plant Gene Research, Huazhong Agricultural University, Wuhan, China
| | - Zuoxiong Liu
- College of Foreign Language, Huazhong Agricultural University, Wuhan, China
| | - Fei Zhou
- National Key Laboratory of Crop Genetic Improvement and National Centre of Plant Gene Research, Huazhong Agricultural University, Wuhan, China
| | - Hao Chen
- National Key Laboratory of Crop Genetic Improvement and National Centre of Plant Gene Research, Huazhong Agricultural University, Wuhan, China
| | - Yongjun Lin
- National Key Laboratory of Crop Genetic Improvement and National Centre of Plant Gene Research, Huazhong Agricultural University, Wuhan, China
| |
Collapse
|
3
|
Manimaran P, Raghurami Reddy M, Bhaskar Rao T, Mangrauthia SK, Sundaram RM, Balachandran SM. Identification of cis-elements and evaluation of upstream regulatory region of a rice anther-specific gene, OSIPP3, conferring pollen-specific expression in Oryza sativa (L.) ssp. indica. PLANT REPRODUCTION 2015; 28:133-42. [PMID: 26081459 DOI: 10.1007/s00497-015-0264-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2015] [Accepted: 06/01/2015] [Indexed: 05/22/2023]
Abstract
Pollen-specific expression. Promoters comprise of various cis-regulatory elements which control development and physiology of plants by regulating gene expression. To understand the promoter specificity and also identification of functional cis-acting elements, progressive 5' deletion analysis of the promoter fragments is widely used. We have evaluated the activity of regulatory elements of 5' promoter deletion sequences of anther-specific gene OSIPP3, viz. OSIPP3-∆1 (1504 bp), OSIPP3-∆2 (968 bp), OSIPP3-∆3 (388 bp) and OSIPP3-∆4 (286 bp) through the expression of transgene GUS in rice. In silico analysis of 1504-bp sequence harboring different copy number of cis-acting regulatory elements such as POLLENLELAT52, GTGANTG10, enhancer element of LAT52 and LAT56 indicated that they were essential for high level of expression in pollen. Histochemical GUS analysis of the transgenic plants revealed that 1504- and 968-bp fragments directed GUS expression in roots and anthers, while the 388- and 286-bp fragments restricted the GUS expression to only pollen, of which 388 bp conferred strong GUS expression. Further, GUS staining analysis of different panicle development stages (P1-P6) confirmed that the GUS gene was preferentially expressed only at P6 stage (late pollen stage). The qRT-PCR analysis of GUS transcript revealed 23-fold higher expression of GUS transcript in OSIPP3-Δ1 followed by OSIPP3-Δ2 (eightfold) and OSIPP3-Δ3 (threefold) when compared to OSIPP3-Δ4. Based on our results, we proposed that among the two smaller fragments, the 388-bp upstream regulatory region could be considered as a promising candidate for pollen-specific expression of agronomically important transgenes in rice.
Collapse
Affiliation(s)
- P Manimaran
- Biotechnology Laboratory, ICAR-Indian Institute of Rice Research, Rajendranagar, Hyderabad, 500030, India
| | - M Raghurami Reddy
- Biotechnology Laboratory, ICAR-Indian Institute of Rice Research, Rajendranagar, Hyderabad, 500030, India
| | - T Bhaskar Rao
- Biotechnology Laboratory, ICAR-Indian Institute of Rice Research, Rajendranagar, Hyderabad, 500030, India
| | - Satendra K Mangrauthia
- Biotechnology Laboratory, ICAR-Indian Institute of Rice Research, Rajendranagar, Hyderabad, 500030, India
| | - R M Sundaram
- Biotechnology Laboratory, ICAR-Indian Institute of Rice Research, Rajendranagar, Hyderabad, 500030, India
| | - S M Balachandran
- Biotechnology Laboratory, ICAR-Indian Institute of Rice Research, Rajendranagar, Hyderabad, 500030, India.
| |
Collapse
|
4
|
Dong Q, Jiang H, Xu Q, Li X, Peng X, Yu H, Xiang Y, Cheng B. Cloning and characterization of a multifunctional promoter from maize (Zea mays L.). Appl Biochem Biotechnol 2014; 175:1344-57. [PMID: 25391545 DOI: 10.1007/s12010-014-1277-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2014] [Accepted: 09/23/2014] [Indexed: 10/24/2022]
Abstract
The use of tissue-specific promoters to drive the expression of target genes during certain developmental stages or in specific organs can prevent unnecessary gene expression caused by constitutive promoters. Utilizing heterologous promoters to regulate the expression of genes in transgenic receptors can help prevent gene silencing. Here, we engineered heterologous maize promoters that regulate gene-specific expression in rice plant receptors. We performed a histochemical and quantitative β-glucuronidase (GUS) analysis of the Zea mays legumin1 (ZM-LEGF) gene promoter and detailed detection of stably transformed rice expressing the GUS gene under the control of the promoter of ZM-LEGF (pZM-LEGF) and its truncated promoters throughout development. When the promoter sequence was truncated, the location and intensity of GUS expression changed. The results suggest that the sequence from -140 to +41 is a critical region that confers the expression of the entire promoter. Truncation of pZM-LEG (3'-deleted region of pZM-LEGF) markedly increased the GUS activity, with the core cis-elements located in the -273 to -140 regions, namely pZM-LEG6. Detailed analysis of pZM-LEG6::GUS T2 transformant rice seeds and plant tissues at different developmental stages indicated that this promoter is an ideal vegetative tissue-specific promoter that can serve as a valuable tool for transgenic rice breeding and genetic engineering studies.
Collapse
Affiliation(s)
- Qing Dong
- Key Lab of Biomass Improvement and Conversion, Anhui Agricultural University, Hefei, 230036, China
| | | | | | | | | | | | | | | |
Collapse
|
5
|
Agrobacterium-mediated genetic transformation and regeneration of transgenic plants using leaf midribs as explants in ramie [Boehmeria nivea (L.) Gaud]. Mol Biol Rep 2014; 41:3257-69. [PMID: 24488319 DOI: 10.1007/s11033-014-3188-4] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2013] [Accepted: 01/21/2014] [Indexed: 12/21/2022]
Abstract
In this study, leaf midribs, the elite explants, were used for the first time to develop an efficient regeneration and transformation protocol for ramie [Boehmeria nivea (L.) Gaud.] via Agrobacterium-mediated genetic transformation. Sensitivity of leaf midribs regeneration to kanamycin was evaluated, which showed that 40 mg l(-1) was the optimal concentration needed to create the necessary selection pressure. Factors affecting the ramie transformation efficiency were evaluated, including leaf age, Agrobacterium concentration, length of infection time for the Agrobacterium solution, acetosyringone concentration in the co-cultivation medium, and the co-cultivation period. The midrib explants from 40-day-old in vitro shoots, an Agrobacterium concentration at OD600 of 0.6, 10-min immersion in the bacteria solution, an acetosyringone concentration of 50 mg l(-1) in the co-cultivation medium and a 3-day co-cultivation period produced the highest efficiencies of regeneration and transformation. In this study, the average transformation rate was 23.25%. Polymerase chain reactions using GUS and NPTII gene-specific primers, Southern blot and histochemical GUS staining analyses further confirmed that the transgene was integrated into the ramie genome and expressed in the transgenic ramie. The establishment of this system of Agrobacterium-mediated genetic transformation and regeneration of transgenic plants will be used not only to introduce genes of interest into the ramie genome for the purpose of trait improvement, but also as a common means of testing gene function by enhancing or inhibiting the expression of target genes.
Collapse
|
6
|
Vyacheslavova AO, Berdichevets IN, Tyurin AA, Shimshilashvili KR, Mustafaev ON, Goldenkova-Pavlova IV. Expression of heterologous genes in plant systems: New possibilities. RUSS J GENET+ 2012. [DOI: 10.1134/s1022795412110130] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
7
|
Agrobacterium tumefaciens-mediated transformation of Phellodendron amurense Rupr. using mature-seed explants. Mol Biol Rep 2012; 40:281-8. [DOI: 10.1007/s11033-012-2059-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2012] [Accepted: 10/03/2012] [Indexed: 10/27/2022]
|
8
|
Sahoo RK, Tuteja N. Development of Agrobacterium-mediated transformation technology for mature seed-derived callus tissues of indica rice cultivar IR64. GM CROPS & FOOD 2012; 3:123-8. [PMID: 22538224 DOI: 10.4161/gmcr.20032] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Indica rice cultivar IR64 is most recalcitrant to regenerate, which affects the transformation efficiency especially when mature seed-derived callus tissues are used as explants. Therefore, a simple, rapid and improved genetic transformation protocol has been developed for the indica rice cultivar IR64 using Agrobacterium-mediated genetic transformation. With different hormonal combination tested, the maximum callus induction was observed on MS medium supplemented with 2.5 mg/l 2,4-D and 0.15 mg/l BAP from the scutellum explants. Three weeks old scutellum derived callus explants were immersed in Agrobacterium suspension (strain LBA4404, OD600=1.0) and co-cultured at 26±2°C in dark for 2 d. The maximum transformation efficiency (12%) was achieved with infection of callus explants for 20 min along with use of 150 μm acetosyringone. The maximum plant regeneration was observed on MS medium supplemented with 3 mg/l BAP, 1 mg/l Kinetin and 0.5 mg/l NAA. The maximum root induction was observed on MS medium along with 10 g/l glucose and 20 g/l sucrose. The integration of the transgene in T1 transgenic plants was confirmed by polymerase chain reaction and Southern blot analyses. The copy number of transgenes has been found to vary from 1 to 2 in transgenic plants. By using this improved method we have successfully raised transgenic rice plants within 3 mo from seed inoculation to plant regeneration.
Collapse
Affiliation(s)
- Ranjan Kumar Sahoo
- International Centre for Genetic Engineering and Biotechnology (ICGEB), New Delhi, India
| | | |
Collapse
|