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Preparation of fluorescent labeled dna and its application as a probe for molecular hybridization

, : Preparation of fluorescent labeled dna and its application as a probe for molecular hybridization. Bioorganicheskaya Khimiya 12(11): 1508-1513

A method of the fluorescent-labeled DNA preparation for visualization of the complementary nucleotide sequences has been developed. Polynucleotide probes were alkylated randomly by 4-(N-methylamino-N-2-chloroethyl)-benzylamine followed by modification with such fluorochromes as dansyl chloride or fluoresceine isothiocyanate (FITC). It was found that the FITC but not dansyl-labeled polynucleotides could serve as efficient probes when about 4% of nitrogen bases were modified. The conditions minimizing the loss of the alkylated bases from DNA were determined. The procedure for hybridization with FITC-labeled DNA as a probe is described, concentration of DNA probe being about 4 ng/mm2 of the nitrocellulose filter.

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