Abstract
We describe a whole-mount RNA in situ hybridization (ISH) method optimized for detection of the cellular and subcellular distributions of specific mRNA within Drosophila testes and male genital tract. Digoxygenin (dig)-labeled antisense RNA probes are in vitro transcribed from a template synthesized by (RT)-PCR; the probe length is reduced by hydrolysis. Testes and male genital tracts are dissected from adult flies, fixed and processed for hybridization. Both probe and fixed testes can be stored before use. Extensive post-hybridization washing reduces the background. Detection is through alkaline phosphatase-conjugated anti-dig antibodies followed by a color reaction. This protocol is suitable for low-medium throughput applications with parallel processing of 2–48 samples, and takes 4–5 d to complete. We have used this protocol, which is similar to other RNA ISH protocols, but optimized for whole-mount Drosophila testes, to document the expression of about 1,000 genes in Drosophila melanogaster male genital tract.
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Acknowledgements
We thank the succession of project students, technicians, PhD students and post-docs who have over the years carried out RNA in situ hybridization in the lab. Between all of us we have probably made every mistake possible in this protocol, thus identifying the important steps. We are very grateful for support from the UK Biotechnology and Biological Sciences Research Council for our testis RNA in situ hybridization projects (Grants BB/C503903/1 and BB_D009324_1). H.W.-C. is a Royal Society University Research Fellow.
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All authors contributed extensively to the work presented in this paper. H.W.-C. adapted and optimized the non-radioactive ISH methods from Drosophila ovaries and testes to work reliably and with minimal background in Drosophila testes and contributed extensively to the paper writing. E.B. previously performed many experiments with the method and contributed to making it a robust assay, particularly by teaching others. She acted as the 'experienced operator' and gave feedback/technical tips on the protocol/paper. C.M. acted as the 'inexperienced operator,' contributed extensively to the writing of the paper and ran many of the experiments used in the figures, all of which are novel and have not been previously published.
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Morris, C., Benson, E. & White-Cooper, H. Determination of gene expression patterns using in situ hybridization to Drosophila testes. Nat Protoc 4, 1807–1819 (2009). https://doi.org/10.1038/nprot.2009.192
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DOI: https://doi.org/10.1038/nprot.2009.192
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