Intrachromosomal localization of breakpoints induced by the restriction endonucleases AluI and BamHI in Chinese hamster ovary cells treated in S phase of the cell cycle.
The restriction endonucleases (REs) AluI and BamHI were electroporated into Chinese hamster ovary (CHO) cells during S phase of the cell cycle and breakpoints in G-banded metaphases were mapped to Giemsa-light or -dark bands or to band junctions. The majority of AluI- and BamHI-induced breakpoints were located in Giemsa-light bands. Both REs induced similar distributions of breakpoint clusters. The localization pattern of S phase-induced breakpoints in CHO cells is similar to the pattern of G1-induced breakpoints reported earlier. These data show that breakpoint localization for both REs is independent of the cell cycle stage (G1 or S) in which aberrations are induced and give further support to the hypothesis that nuclease hypersensitive regions (NHRs) associated with active genes play an important role in the distribution of breakpoints.
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División de Citogenética Humana y Microscopía Cuantitativa, Instituto de Investigaciones Biológicas Clemente Estable, Montevideo, Uruguay.
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D000818:Animals; D016466:CHO Cells; D002869:Chromosome Aberrations; D002871:Chromosome Banding; D006224:Cricetinae; D015245:Deoxyribonuclease BamHI / Q000494:pharmacology*; D015252:Deoxyribonucleases, Type II Site-Specific / Q000494:pharmacology*; D016196:S Phase
D015245:Deoxyribonuclease BamHI; C024669:endodeoxyribonuclease AluI; D015252:Deoxyribonucleases, Type II Site-Specific