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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

Banding technique used for the detection of chromosomal aberrations induced by radiation and alkylating agents TEPA and epichlorohydrin.

Blood samples from two healthy donors were exposed, (1) to 200 R of X-rays in G0 and G1S phases of the cell cycle, and (2) to epichlorohydrin 10(-6) M and TEPA 10(-4) M in G0 and/or in G1S and G2 phases. Part of the cells was processed for chromosome studies conventionally and the other part by the trypsinization banding technique. Detailed chromosomal analysis showed that, after irradiation, 38.2% of aberrations in G0 and 18.7% in G1S phases escaped cytogenetic detection when the conventional technique was used. After exposures to TEPA and ECHH, 10.9% of aberrations were undectable in G0 and 3.3% in G1S and G2 phases. The distribution of chromosome breaks was non-random both after irradiation and after exposure to alkylating agents. However, it differed according to the mutagen used. Some chromosomal segments were broken significantly more frequently than the others (e.g. 9q12), some were resistant to breakage (e.g. the whole Y chromsome). The segments represented by G-negative bands were more fragile than the G-positive and G-variable segments.[1]

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