alexa Chromosome structure as revealed by a combined chemical and immunochemical procedure.
Biochemistry

Biochemistry

Biochemistry & Analytical Biochemistry

Author(s): Schreck RR, Warburton D, Miller OJ, Beiser SM, Erlanger BF

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Abstract Human metaphase chromosomes were photooxidized in the presence of methylene blue, a process that destroys guanine residues in DNA. Indirect immunofluorescence showed that such chromosomes reacted with a cytosine-specific antibody revealing a consistent fluorescent banding pattern by which each chromosome could be identified. The observed fluorescent patterns were the reverse of those produced in formamide-denatured chromosomes treated with an antibody specific for adenine and of the patterns obtained with quinacrine and with Giemsa staining by the G-banding techniques. The patterns were identical to Giemsa R-banding patterns. The chromosome banding patterns, therefore, appeared to reflect DNA base composition, indicating the feasibility of a combined chemical-immunochemical investigation of the chemical organization of chromosomes.
This article was published in Proc Natl Acad Sci U S A and referenced in Biochemistry & Analytical Biochemistry

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