JOURNAL ARTICLE
RESEARCH SUPPORT, U.S. GOV'T, NON-P.H.S.
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In situ hybridization of embryos with antisense RNA probes.

Detection of transcripts in situ is a rapid means by which gene expression can be characterized in many systems. In the nematode, Caenorhabditis elegans, the ease with which transgenics can be made and the general reliability of reporter fusion expression patterns, have made this technique comparatively less popular than in other systems. There are, however, still applications in which in situ hybridization is desired, such as for maternally expressed genes, or in related species without established transgene methods. The most frequently used method of in situ hybridization uses DNA probes and formaldehyde fixation. A newer approach that permits single-transcript detection has been reported and will not be described here (Raj and Tyagi, 2010). Rather, we describe an alternative protocol that uses RNA probes with a different fixative. This approach has been applied to C. elegans and related nematodes, providing reliable, sensitive detection of endogenous transcripts.

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