Abstract
The Arabidopsis thaliana promoter trap line GUS-650 showing uidA reporter gene expression specifically in mature embryo sacs was found to carry transfer DNA (T-DNA) insertion in the 5′ untranslated region (UTR) of At3g17150. At3g17140 and At3g17150 are a pair of head-to-head-oriented genes separated by a 668-bp intergenic region encoding for a putative pectin methyl esterase inhibitor protein. In the GUS-650 line, uidA reporter gene was inserted in head-to-head orientation to the At3g17140 gene. Presence of At3g17140 transcripts in the GUS-650 line indicated that T-DNA insertion did not affect this gene and the 668-bp intergenic region functions as a bi-directional promoter. The 672-bp fragment separating the uidA and At3g17140 genes was cloned and placed in forward or reverse orientation next to the uidA gene. Transgenic Arabidopsis plants carrying either of these constructs showed β-glucuronidase (GUS) activity in the ovules confirming that the 672-bp sequence is a bi-directional promoter specific to ovules. These results were also supported by the presence of cis-acting motifs such as TATA box, CAAT box, seed storage protein element (CAACAC), endosperm-specific elements (AACA), Skn-1 motif (GTCAT) and bZIP transcription factor binding element (ACGT) within the 672-bp sequence in both orientations. The significance of a promoter trap approach and the utility of such a promoter are discussed.
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Acknowledgments
The authors thank the Indian Council of Agricultural Research, New Delhi, India, for financial assistance through the National Agricultural Innovative Project (NAIP/C4/C1072/2006-07) and are grateful to the Council of Scientific and Industrial Research (CSIR), New Delhi, India, for providing infrastructural and financial support in the form of projects MLP-072 and BSC-0107. The manuscript represents CSIR-IHBT communication number 3700.
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Sharma, I., Srinivasan, R., Ahuja, P.S. et al. Identification and Characterization of a T-DNA Promoter Trap Line of Arabidopsis thaliana Uncovers an Embryo Sac-Specific Bi-directional Promoter. Plant Mol Biol Rep 33, 1404–1412 (2015). https://doi.org/10.1007/s11105-014-0829-7
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DOI: https://doi.org/10.1007/s11105-014-0829-7