Abstract
Whole mount in situ hybridization (WMISH) is a method for detecting specific messenger ribonucleic acids (mRNAs) at their site of expression within an embryo or intact tissue fragment. Like conventional in situ hybridization, WMISH depends upon the availability of a complementary nucleic acid probe which can be labeled, annealed to the mRNA fixed within the tissue, and subsequently detected. Whereas the conventional approach uses radioactive probes hybridized to tissue sections, WMISH refers to hybridization to intact tissue or embryos using nonradioactive probes that are detected using standard immunohistochemical methods. For developmental biologists, WMISH offers the advantage of visualizing the domain of expression of a gene within the context of the entire embryo. In addition, WMISH can be used to study more than one gene in the same embryo, allowing spatial and temporal overlaps in expression to be clearly discerned (Fig 1). Similar to conventional in situ hybridization, one can determine the precise cellular distribution of expression by embedding and sectioning embryos following WMISH. For these reasons WMISH has become an essential and standard tool for studying gene expression during embryonic development (e.g., see 1).
(See color plate 5 appearing after p. 262.) An example of a two-color WMISH. The E8.5 embryo has been hybridized with a DIG-labeled probe to the Paraxis gene (15) and a fluorescein-labeled probe to the Brachyury gene (16). Color detection was done using BM Purple for Brachyury and BCIP for Paraxis. The embryo is viewed from its ventral side with anterior (rostral) towards the top. The light blue color marks the somites and the dark blue/purple marks the developing notochord in the middle of the embryo as well as marking the posterior (caudal) end.
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Lowe, L.A., Kuehn, M.R. (2000). Whole Mount In Situ Hybridization to Study Gene Expression During Mouse Development. In: Tuan, R.S., Lo, C.W. (eds) Developmental Biology Protocols. Methods in Molecular Biology™, vol 137. Humana Press. https://doi.org/10.1385/1-59259-066-7:125
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DOI: https://doi.org/10.1385/1-59259-066-7:125
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