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Table 2 Gene amplification analysis in MTX-resistant clones

From: Gene amplification in human cells knocked down for RAD54

   

N° (%) MTX-resistant clones with

Knocked-down

gene

N° clones

analyzed

N° amplified

clones (%)

HSR

DMs

HSR DMs

i(5q)

DMs i(5q)

HSR DMs i(5q)

None (HeLa wt)

11

4 (36%)

0

4 (100%)

0

0

0

0

DNA-PKcs

24

16 (67%)

0

14 (87.5%)

1 (6.2%)

0

0

1 (6.2%)

RAD54

24

16 (67%)

1 (6.2%)

6 (37.5%)

3 (18.7%)

4 (25%)

2 (12.5%)

0

RAD54 and DNA-PKcs

11

7 (64%)

2 (28.6%)

1 (14.3%)

0

3 (42.8%)

1 (14.3%)

0

  1. The clones analyzed derived from cell lines with different repair functions impaired. The organization of the DHFR gene was analyzed on mitotic chromosomes by FISH with a specific DHFR probe. HSR: homologous staining regions, DMs: double minutes, i(5q): isochromosome.