ArticleChromosome research : an international journal on the molecular, supramolecular and evolutionary aspects of chromosome biology2025
CRISPR-CISH: an in situ chromogenic DNA repeat detection system for research and life science education.
Article in Chromosome research : an international journal on the molecular, supramolecular and evolutionary aspects of chromosome biology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
In situ hybridization is a technique to visualize specific DNA sequences within nuclei and chromosomes. Various DNA in situ fluorescent labeling methods have been developed, which typically involve global DNA denaturation prior to the probe hybridization and often require fluorescence microscopes for visualization. Here, we report the development of a CRISPR/dCas9-mediated chromogenic in situ DNA detection (CRISPR-CISH) method that combines chromogenic signal detection with CRISPR imaging. This non-fluorescent approach uses 3' biotin-labeled tracrRNA and target-specific crRNA to form mature gRNA, which activates dCas9 to bind to target sequences. The subsequent application of streptavidin alkaline phosphatase or horseradish peroxidase generates chromogenic, target-specific signals that can be analyzed using conventional bright-field microscopes. Additionally, chromatin counterstains were identified to aid in the interpretation of CRISPR-CISH-generated target signals. This advancement makes in situ DNA detection techniques more accessible to researchers, diagnostic applications, and educational institutions in resource-limited settings.
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