HuluFISH non-denaturing in situ detection of genomic DNA opened by CRISPR-Cas9 Nickase and Exonuclease
Han, K.; Liu, S.; Cheng, Y.
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DNA fluorescence in situ hybridization (FISH) has been widely used in diagnosis and genetic research. Traditional Bacterial artificial chromosome (BAC) or oligonucleotide based probe to detect DNA in situ is only effective when the target is relatively large, usually over 150Kb DNA fragments. And it involves heat denaturation steps to open the DNA for in situ hybridization. The heat process can affect the fine structure of nuclei. Here we reported a novel method based on Cas9 nickase and exonuclease digestion of double strand DNA and permanently mark the DNA in single strand state for FISH. With this novel design, we detected non-repetitive genomic loci as small as 2Kb.
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