Gateway-compatible tissue-specific vectors for plant transformation
© Michniewicz et al.; licensee BioMed Central. 2015
Received: 25 July 2014
Accepted: 11 February 2015
Published: 3 March 2015
Understanding regulation of developmental events has increasingly required the use of tissue-specific expression of diverse genes affecting plant growth and environmental responses.
To allow for cloning of presumptive promoters with tissue-specific activities, we created two plant expression vectors with multiple cloning sites upstream of a Gateway cassette for expression of either untagged or YFP-tagged genes of interest. For fast and easy tissue-specific expression of desired genes, we further developed an initial set of Gateway-compatible tissue-specific gene expression vectors that allow for the expression of YFP-tagged or untagged proteins driven by the ALCOHOL DEHYDROGENASE1, CHLOROPHYLL A/B BINDING PROTEIN 1, COBRA LIKE1, EXPANSIN7, LATERAL ORGAN BOUNDARIES-DOMAIN 16, SCARECROW, UBIQUITIN10, and WOODEN LEG upstream regulatory regions.
These vectors provide an invaluable resource to the plant community, allowing for rapid generation of a variety of tissue-specific expression constructs.
Multiple genes contribute to plant development, and these contributions can vary by tissue type. Increasingly, researchers are turning to tissue-specific gene expression to gain spatial resolution of these plant processes. For example, cell-type specific gene expression has allowed for dissection of the control of many processes, including ovule development , cell-autonomous and non-cell-autonomous controls of photoperiodic flowering , and the spatial specificity of phytochrome responses .
The currently available systems for tissue- and cell-type-specific gene expression include either cloning desired promoters individually or using two-component systems [4-9]. In some of these two-component systems consisting of a transcription factor and a target promoter, treatment with inducers such as 17-β-estradiol  or ethanol [4,10,11] promotes the transcription factor binding to and activating the target promoter to allow for temporal control of gene activation in addition to the spatial control afforded by tissue-specific promoters. Although these systems have been instrumental in understanding spatial and temporal gene functions, they have the disadvantage of being unwieldy when studying tissue-specific gene rescue in higher order mutants. Additionally, the alternative of cloning individual promoters can be time-consuming.
To overcome the limitations of the current systems for creating plants with tissue-specific expression of desired genes, we have developed a set of Gateway-compatible destination vectors for tissue-specific expression to facilitate spatial analysis of gene function. This novel vector set will allow for rapid, uncomplicated construct creation for spatial examination of desired genes in higher-order mutant backgrounds.
We have generated a vector set to provide a rapid method for creating transgenic plants expressing genes of interest in a tissue-specific manner. Vector details, including the complete DNA sequences, can be found on the website http://pages.wustl.edu/strader/vectors, which will be updated as additional vectors are created.
Promoterless Gateway-compatible destination vectors with multiple cloning sites for creation of plant expression constructs
We generated promoterless Gateway-compatible plant expression vectors from pEarleyGate100  and pEarleyGate104  by replacing the cauliflower mosaic virus 35S promoter  with a multiple cloning site. pEarleyGate100  and pEarleyGate104  were built from pFGC5941 vector (http://chromdb.org) derived from the pCAMBIA (http://www.cambia.org) vector.
The pMCS:GW vector consists of a T-DNA left border, followed by the Basta herbicide resistance gene, a multiple cloning site, the Gateway cassette (attR1, chloramphenicol resistance gene, ccdB, attR2), the 3′ sequence of the octopine synthase gene, and T-DNA right border (Figure 1). The pMCS:YFP-GW vector consists of a T-DNA left border, followed by the Basta herbicide resistance gene, a multiple cloning site, the in-frame coding region for yellow fluorescent protein (YFP), the Gateway cassette (attR1, chloramphenicol resistance gene, ccdB, attR2), the 3′ sequence of the octopine synthase gene, and T-DNA right border for creation of N-terminal YFP fusion proteins (Figure 1). pMCS:GW, pMCS:YFP-GW, and variants thereof confer kanamycin resistance to Escherichia coli and Agrobacterium tumefaciens. The T-DNA from these vectors confers phosphinothricin (Basta) resistance to plants.
Gateway-compatible destination vectors for tissue-specific expression
Presumptive promoter regions used in vector set
Region used in construct
Expected tissue expression
−1092 to -1
root, anoxic tissues
−2148 to -1
shoot, photosynthetic tissues
−730 to -5
lateral root primordia, columella, leaf vascular tissue and hydathodes
−1866 to -1
−1309 to +1
lateral root primordia
−2162 to +1
root endodermis, endodermis initials, quiescent center, shoot apical meristem L1 layer, shoot endodermis, shoot tissue surrounding vascular bundles
−1612 to -28
throughout the plant
−2085 to +1
root vascular cylinder and pericycle
UBIQUITIN10 (UBQ10) is a transcript expressed throughout the plant and is often used as a control in expression profiling experiments. Large-scale transcript profiling experiments have revealed that UBQ10 is stably expressed and is in the top percentile of highly expressed genes in Arabidopsis , suggesting that genes driven by the UBQ10 promoter would be highly expressed throughout the plant. To create a Gateway-compatible plant expression vector for uniform expression to serve as an alternative to 35S-driven vectors, we cloned the upstream regulatory region of UBQ10 into pMCS:GW and pMCS:YFP-GW. These new vectors, named pUBQ10:GW and pUBQ10:YFP-GW, can be used to create constructs for expressing genes encoding untagged or YFP-tagged proteins behind the UBQ10 presumptive promoter.
General shoot and root expression
We were interested in developing Gateway-compatible expression constructs for shoot and root tissues. CHLOROPHYLL A/B BINDING PROTEIN 1 (CAB1) expression is light-regulated in a phytochrome-dependent manner [15,16], induced by cold treatment , and regulated by circadian rhythms [18,19] and sugar homeostasis [20,21]. Additionally, CAB1 is expressed in leaf and stem tissues, but not in root tissues in peas and tobacco [22-24]. Because both near and far upstream regions of the Arabidopsis CAB1 promoter are involved in the specificity of CAB1 expression , we captured the region from -2148 to -1 (where +1 is the A of the CAB1 ATG) upstream of CAB1 to drive expression of our Gateway-compatible constructs. We cloned this CAB1 upstream regulatory region into pMCS:GW and pMCS:YFP-GW to create pCAB1p:GW and pCAB1p:YFP-GW.
The ALCOHOL DEHYDROGENASE1 (ADH1) promoter region has previously been used to express genes exclusively in root tissues; however, ADH1 expression in roots is not developmentally regulated. Instead, ADH1 expression is upregulated in horizontally-grown roots on agar plates because these roots are experiencing the stress of hypoxia [25,26]. Additionally, ADH1 expression is upregulated by dehydration [26,27], ABA treatment [27,28], cold [26,27], and is altered by space flight . Because Dolferus et al.  reported the region 1 kb upstream of ADH1 was sufficient to drive GUS reporter expression to mimic the developmental and tissue-specific expression of the endogenous ADH1 gene, we cloned the ADH1 upstream regulatory region from -1092 to -1 (where +1 is the A of the ADH1 ATG) into pMCS:GW and pMCS:YFP-GW to create Gateway-compatible vectors for expression of genes in roots of horizontally-grown seedlings on agar plates. These new vectors are named pADH1:GW and pADH1:YFP-GW.
Tissue-specific expression throughout shoots and roots
SCARECROW (SCR) exhibits tissue-specific expression in both shoot and roots. SCR expression is detected in the endodermis, endodermis initials, and occasionally the quiescent center of roots [30,31]. In addition, SCR is expressed in the endodermis of seedling hypocotyls, in the L1 layer of the shoot apical meristem, and in the tissue layer adjacent to vascular bundles . The 2.5-kb region upstream of SCR is sufficient to drive this expression pattern [30,32]. We cloned the SCR upstream regulatory region into pMCS:GW and pMCS:YFP-GW to create pSCR:GW and pSCR:YFP-GW.
COBRA LIKE1 (COBL1) is expressed in several tissues throughout the root, including columella, weakly in the stele, and strongly in lateral root primordia . In addition, COBL1 is expressed in leaf vascular tissue and hydathodes . The 687-bp region upstream of COBL1 is sufficient to drive this expression pattern . We cloned the COBL1 upstream regulatory region into pMCS:GW and pMCS:YFP-GW to create pCOBL1:GW and pCOBL1:YFP-GW.
Tissue-specific expression in roots
Plant roots serve as an ideal developmental model because cells within an individual root are at various developmental stages, ordered from the root tip to the root-shoot junction. Root cells are also organized by radial symmetry, allowing for analysis along the radial axis. In addition to the Gateway-compatible tissue-specific vectors described above, which allows for expression in both root and shoot tissues, we created root tissue-specific Gateway-compatible vectors. We chose a representative set of promoters expressed in cell-type-specific manner within the roots, including EXPANSIN7, LATERAL ORGAN BOUNDARIES-DOMAIN 16, and WOODEN LEG upstream regions, and cloned them into pMCS:GW and pMCS:YFP-GW.
EXPANSIN7 (EXP7) is strictly expressed in root hair cells, and is not expressed in aerial portions of the plant . The 386-bp region upstream of EXP7 was sufficient to drive this expression pattern . We cloned the EXP7 upstream regulatory region into pMCS:GW and pMCS:YFP-GW to create pEXP7:GW and pEXP7:YFP-GW.
The enhancer trap line J0192  has been used to drive expression of genes in lateral root primordia . The insertion in J0192 is upstream of LATERAL ORGAN BOUNDARIES-DOMAIN 16 (LBD16) . LBD16 is predominantly expressed in roots . In young seedlings, LBD16 is expressed strongly in the primary root tip and at the root-shoot junction , whereas, in older seedlings, LBD16 expression is restricted to young lateral root primordia (Stages I-IV) and is no longer detected in root tips . Additionally, LBD16 is weakly expressed in the root vasculature . The 1.5-kb region upstream of LBD16 is sufficient to drive this expression pattern . We cloned the LBD16 upstream regulatory region into pMCS:GW and pMCS:YFP-GW to create pLBD16:GW and pLBD16:YFP-GW.
WOODEN LEG/CYTOKININ RESPONSE1/ARABIDOPSIS HISTIDINE KINASE4 (WOL/CRE1/AHK4) is expressed in the vascular cylinder and pericycle of root tissues [38,39]. We cloned the WOL upstream regulatory region into pMCS:GW and pMCS:YFP-GW to create pWOL:GW and pWOL:YFP-GW.
These tissue-speficic-promoter-driven Gateway-compatible constructs allow for easy insertion of genes of interest and can be used to drive expression of genes of interest in various root and shoot tissues.
Evaluation of tissue-specific expression
Our observed expression patterns from all tested constructs matched expected expression patterns (Table 1), suggesting that these Gateway-compatible vectors will allow spatial examination of the effects of genes of interest.
In summary, we have generated two plant expression vectors with multiple cloning sites upstream of a Gateway cassette for expression of either untagged or YFP-tagged genes of interest. We have further developed an initial set of ten Gateway-compatible tissue-specific gene expression vectors that allow for the expression of YFP-tagged or untagged proteins driven by the ALCOHOL DEHYDROGENASE1, CHLOROPHYLL A/B BINDING PROTEIN 1, COBRA LIKE1, EXPANSIN7, LATERAL ORGAN BOUNDARIES-DOMAIN 16, SCARECROW, UBIQUITIN10, and WOODEN LEG presumptive promoters. These vectors provide an invaluable resource to the plant community to allow for rapid generation of tissue-specific plant expression constructs.
Although our observed expression patterns (Figure 2) matched our expected expression patterns (Table 1), the tissues in which these constructs are expressed may be affected by growth conditions and mutant background. For example, the ADH1 promoter, which responds to anoxia for root expression [25,26] is also responsive to dehydration [26,27], ABA treatment [27,28], cold [26,27], and space flight . Thus, caution and appropriate controls should be used when interpreting data.
We anticipate that additional tissue-specific Gateway-compatible vectors based on the MCS:GW and MCS:YFP-GW vectors will be created by our lab and by other labs. We will maintain a database of further constructs created from the MCS:GW and MCS:YFP-GW backbones at http://pages.wustl.edu/strader/vectors.
In summary, we have engineered a set of Gateway-compatible vectors for tissue-specific expression to provide a reliable cloning method for quick creation of expression constructs for multiple tissues. We anticipate that these vectors will be a useful addition to the many Gateway-compatible vectors currently available to the plant community.
Materials and methods
pMCS:GW and pMCS:YFP-GW vectors
To remove the EcoRI site from the chloramphenicol resistance gene region of pEarleyGate100  and pEarlyGate104 , we performed site-directed mutagenesis using the QuikChange Lightning Multi Site-Directed Mutagenesis Kit (Agilent) and primers CM-M1 (5′ – CATCCGGAGTTCCGTATGGCAATGAAAGACGGTGAGCTG – 3′) and CM-M2 (5′ – CAGCTCACCGTCTTTCATTGCCATACGGAACTCCGGATG – 3′). To remove the XhoI and EcoRI sites from the YFP region of pEarlyGate104 , we performed site-directed mutagenesis using the QuikChange Lightning Multi Site-Directed Mutagenesis Kit (Agilent) and primers YFP-M1 (5′-GACTCAGATCACGAGCTCAAGCTTCAAATTCTGCAGTCGACGGTA-3′) and YFP-M2 (5′-TACCGTCGACTGCAGAATTTGAAGCTTGAGCTCGTGATCTGAGTC-3′). To create a double-stranded multiple cloning site (MCS), we annealed MCS-1 (5′-AATTCGCGACGTCCCTAGGAGATCTTCGAACACGTGAGGCC-3′) and MCS-2 (5′-TCGAGGCCTCACGTGTTCGAAGATCTCCTAGGGACGTCGCG-3′) by heating 100 pmol of each oligonucleotide in 2x SSC to 100°C for 5 minutes before cooling to room temperature on the bench top. This annealed double-stranded MCS had overhangs compatible with EcoRI and XhoI restriction sites. The mutant pEarleyGate100 and pEarlyGate104 vectors were digested with EcoRI and XhoI to excise the 35S promoter. The double-stranded MCS was cloned into the mutant pEarleyGate100 and pEarlyGate104 backbones to create pMCS:GW (derived from pEarleyGate100) and pMCS:YFP-GW (derived from pEarleyGate104).
Cloning upstream regulatory regions
Genomic DNA was extracted from Arabidopsis thaliana Columbia-0 (Col-0) seedling tissue . Upstream regulatory regions for use in tissue-specific expression vectors were PCR-amplified from Col-0 genomic DNA using Pfx Platinum Taq (Life Technologies) and the following primer pairs: ADH1-EcoRI (5′-GAATTCCACACTGAAGAAAAAGATTACACC-3′) and ADH1-XhoI (5′-CTCGAGCAACAGTGAAGAACTTGCTTTTG-3′); CAB1-NruI (5′-TCGCGAGACTAACTTGTGAGTGAGAGTG-3′) and CAB1-XhoI (5′-CTCGAGGAGGTTGAGTAGTGCAGCAC-3′); COBL1-NruI (5′-TCGCGACTCATGTTTGGTTGTACTACTG-3′) and COBL1-XhoI (5′-CTCGAGCTGAAGCAAAAAAAGAGAGAG-3′); EXP7-EcoRI (5′-GAATTCCGTCAAGGCTGGATATGCTGTG-3′) and EXP7-XhoI (5′-CTCGAGGCTGCGATCTAACAATTTCAGAC-3′); LBD1-EcoRI (5′-GAATTCGCGGAAGAACTTATAAAATAAC-3′) and LBD1-XhoI (5′-CTCGAGCGGCGAAACGAACAAAAAAGTG-3′); SCR-EcoRI (5′-GAATTCGATTGTGATCCTCTGCAACAAAGC-3′) and SCR-XhoI (5′-CTCGAGGGAGATTGAAGGGTTGTTGGTCG-3′); UBQ10-AatII (5′-GACGTCGTATGATCGCGAAGCACCCACCCTAAGC-3′) and UBQ10-XhoI (5′-CTCGAGGACAAATTCGATCGCACAAAC-3′); and WOL1-AatII (5′-GACGTCCTCACACACCACACCATCATTATC-3′) and WOL1-XhoI (5′-CTCGAGCACTTCAAATGTAGGTATTCC-3′). The resulting PCR products were captured into the pCR4 vector (Life Technologies) to create pCR4-ADH1p, pCR4-CAB1p, pCR4-COBL1p, pCR4-EXP7p, pCR4-LBD16p, pCR4-SCRp, pCR4-UBQ10p, and pCR4-WOL1p. All constructs were sequenced (GeneWiz, Inc.) to confirm error-free clones.
Gateway-compatible tissue-specific expression vectors
The ADH1 upstream regulatory region was excised from pCR4-ADH1p using EcoRI and XhoI and subcloned into pMCS:GW and pMCS:YFP-GW to create pADH1:GW and pADH1:YFP-GW. The CAB1 upstream regulatory region was excised from pCR4-CAB1p using NruI and XhoI and subcloned into pMCS:GW and pMCS:YFP-GW to create pCAB1:GW and pCAB1:YFP-GW. The COBL1 upstream regulatory region was excised from pCR4-COBL1p using NruI and XhoI and subcloned into pMCS:GW and pMCS:YFP-GW to create pCOBL1:GW and pCOBL1:YFP-GW. The EXP7 upstream regulatory region was excised from pCR4-EXP7p using EcoRI and XhoI and subcloned into pMCS:GW and pMCS:YFP-GW to create pEXP7:GW and pEXP7:YFP-GW. The LBD16 upstream regulatory region was excised from pCR4-LBD16p using EcoRI and XhoI and subcloned into pMCS:GW and pMCS:YFP-GW to create pLBD16:GW and pLBD16:YFP-GW. The SCR upstream regulatory region was excised from pCR4-SCRp using EcoRI and XhoI and subcloned into pMCS:GW and pMCS:YFP-GW to create pSCR:GW and pSCR:YFP-GW. The UBQ10 upstream regulatory region was excised from pCR4-UBQ10p using AatII and XhoI and subcloned into pMCS:GW and pMCS:YFP-GW to create pUBQ10:GW and pUBQ10:YFP-GW. The WOL1 upstream regulatory region was excised from pCR4-WOL1p using AatII and XhoI and subcloned into pMCS:GW and pMCS:YFP-GW to create pWOL1:GW and pWOL1:YFP-GW. All constructs were sequenced (GeneWiz, Inc.) to confirm error-free clones.
Plant transformation and plant growth conditions
The pADH1:YFP-GW, pCAB1:YFP-GW, pCOBL1:YFP-GW, pEXP7:YFP-GW, pLBD16:YFP-GW, pSCR:YFP-GW, pUBQ10:YFP-GW, and pWOL:YFP-GW plasmids were electroporated into Agrobacterium tumefaciens strain GV3101 . Arabidopsis thaliana Col-0 was transformed by the floral dip method . Transformants were selected on plant nutrient (PN) medium  solidified with 0.6% (w/v) agar and supplemented with 7.5 μg/mL Basta (phosphinothricin).
Seedlings were mounted and imaged using either a Leica MZ10F fluorescence stereomicroscope with a YFP filter set (510/20 nm excitation, 560/40 nm emission) or with a Zeiss LSM510 laser scanning microscope. Images were converted and merged using NIH Image software.
Distribution of materials
All described plant expression vectors are deposited at the Arabidopsis Biological Resource Center (ABRC; www.arabidopsis.org). ABRC stock numbers, vector maps, and sequences can be found at http://pages.wustl.edu/strader/vectors.
We are grateful to the ABRC for providing the pEarleyGate100 and pEarleyGate104 vectors and Tara Enders, David Korasick, and Samantha Powers for critical comments on the manuscript. This research was supported by the National Institutes of Health (R00 GM089987-03 to L.C.S.).
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