Protocol: A fast and simple in situ PCR method for localising gene expression in plant tissue

Asmini Athman, Sandra K. Tanz, Vanessa M. Conn, Charlotte Jordans, Gwenda M. Mayo, Weng W. Ng, Rachel Anita Burton, Simon J. Conn, Matthew Gilliham

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24 Citations (Scopus)

Abstract

Background: An important step in characterising the function of a gene is identifying the cells in which it is expressed. Traditional methods to determine this include in situ hybridisation, gene promoter-reporter fusions or cell isolation/purification techniques followed by quantitative PCR. These methods, although frequently used, can have limitations including their time-consuming nature, limited specificity, reliance upon well-annotated promoters, high cost, and the need for specialized equipment. In situ PCR is a relatively simple and rapid method that involves the amplification of specific mRNA directly within plant tissue whilst incorporating labelled nucleotides that are subsequently detected by immunohistochemistry. Another notable advantage of this technique is that it can be used on plants that are not easily genetically transformed.Results: An optimised workflow for in-tube and on-slide in situ PCR is presented that has been evaluated using multiple plant species and tissue types. The protocol includes optimised methods for: (i) fixing, embedding, and sectioning of plant tissue; (ii) DNase treatment; (iii) in situ RT-PCR with the incorporation of DIG-labelled nucleotides; (iv) signal detection using colourimetric alkaline phosphatase substrates; and (v) mounting and microscopy. We also provide advice on troubleshooting and the limitations of using fluorescence as an alternative detection method. Using our protocol, reliable results can be obtained within two days from harvesting plant material. This method requires limited specialized equipment and can be adopted by any laboratory with a vibratome (vibrating blade microtome), a standard thermocycler, and a microscope. We show that the technique can be used to localise gene expression with cell-specific resolution.Conclusions: The in situ PCR method presented here is highly sensitive and specific. It reliably identifies the cellular expression pattern of even highly homologous and low abundance transcripts within target tissues, and can be completed within two days of harvesting tissue. As such, it has considerable advantages over other methods, especially in terms of time and cost. We recommend its adoption as the standard laboratory technique of choice for demonstrating the cellular expression pattern of a gene of interest.

Original languageEnglish
Article number29 (2014)
Number of pages19
JournalPlant Methods
Volume10
Issue number1
DOIs
Publication statusPublished - 18 Sep 2014
Externally publishedYes

Bibliographical note

This is an Open Access article distributed under the terms of the CreativeCommons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, andreproduction in any medium, provided the original work is properly credited. The Creative Commons Public DomainDedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article,unless otherwise stated

Keywords

  • Cell-specific localisation
  • Immunohistochemistry
  • In situ PCR
  • Plant tissue
  • RT-PCR

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    Athman, A., Tanz, S. K., Conn, V. M., Jordans, C., Mayo, G. M., Ng, W. W., Burton, R. A., Conn, S. J., & Gilliham, M. (2014). Protocol: A fast and simple in situ PCR method for localising gene expression in plant tissue. Plant Methods, 10(1), [29 (2014)]. https://doi.org/10.1186/1746-4811-10-29