Abstract
This protocol enables transcriptome profiling of specific cell or tissue types that are isolated from tomato using laser microdissection (LM). To prepare tissue for LM, fruit samples are first fixed in optimal cutting temperature (OCT) medium and frozen in molds. The tissue is then sectioned using a cryostat before being dissected using an LM instrument. The RNAs contained in the harvested cells are purified and subjected to two rounds of amplification to yield sufficient quantities of RNA to generate cDNA libraries. Unlike several other techniques that are used to isolate specific cell types, LM has the advantage of being readily applied to any plant species without having to generate transgenic plants. Using the protocols described here, LM-mediated cell-type transcriptomic analysis of two samples requires ∼8 d from tissue harvest to RNA sequencing (RNA-seq), whereas each additional sample, up to a total of 12 samples, requires ∼1 additional day for the LM step. RNA obtained using this method has been successfully used for deep-coverage transcriptome profiling, which is a particularly effective strategy for identifying genes that are differentially expressed between cell or tissue types.
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Acknowledgements
We acknowledge the Imaging Facility of Cornell University's Biotechnology Resource Center (Institute of Biotechnology) for the use of its Zeiss laser microdissection system. J.K.C.R. and C.C. were supported by a grant from the US National Science Foundation (Plant Genome Research Program; IOS-1339287), and Y.S. was partially supported by a Grant-in-Aid for JSPS Fellows from the Japan Society for the Promotion of Science (16J00582). A.J.M. was supported by the Spanish Ministry of Economy and Competitiveness with the Ramón y Cajal Fellowship (RYC-2011-08839).
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L.B.B.M., A.J.M., P.N. and Y.S. developed the protocol. L.B.B.M., P.N., C.C. and J.K.C.R. wrote the paper.
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Supplementary Figure 1 Annotation of cryostat features
a, block-holder; b, block in embedding mold; c, UV box; d, Object-holder; e, tightening screw; f, object-orientation knob; g, knife holder; h, angle control; i, anti-roll glass plate; j, CFSA 1X slide inside its protective wrapping; k, adhesive tape window; l, frame slide with PET-membrane; m, roller.
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Cryostat nomenclature. (PDF 266 kb)
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Martin, L., Nicolas, P., Matas, A. et al. Laser microdissection of tomato fruit cell and tissue types for transcriptome profiling. Nat Protoc 11, 2376–2388 (2016). https://doi.org/10.1038/nprot.2016.146
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DOI: https://doi.org/10.1038/nprot.2016.146
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