Complementation group assignments of moderately UV-sensitive CHO mutants isolated by large-scale screening (FAECB).

Abstract:

:The complementation group (CG) assignment is presented for 74 moderately sensitive (approximately 2-4x sensitivity of parental line based on ratio of D10s) UV-sensitive mutants of Chinese hamster ovary (CHO) cells from the Facility for Automated Experiments in Cell Biology (FAECB) collection. The distribution of mutants within the first five rodent UV CGs was similar to that of previously reported highly sensitive (> 4x wild-type UV sensitivity) mutants from this collection. This analysis nearly completes the identification of this large collection of over 200 mutant lines isolated after screening an estimated 3 million total colonies of mutagenized CHO cells from approximately 20 mutant hunts with up to about 400,000 colonies screened. Only eight lines with less than about 2x parental line UV sensitivity remain unassigned. One CG of UV mutants (CG6), which now has five identified representatives in the collection, has only been found among moderately UV-sensitive CHO cells. Mutant UV40, a mitomycin C (MMC)- and X-ray-sensitive line with moderate UV cross-sensitivity, is not in CGs 1-6 and apparently is not a nucleotide excision repair mutant. Also identified were new alleles of CG1 and CG4 mutants with profoundly deficient unscheduled DNA synthesis and moderate UV sensitivity but low sensitivity to MMC. The first CG5 mutant derived from MMC-sensitive MC5 cells has been identified as the second CG5 mutant in the collection. No representatives of rodent CGs 7-11 were found, suggesting that AA8 cells have a chromosomal makeup that precludes easy isolation of mutants in these CGs.

journal_name

Mutagenesis

journal_title

Mutagenesis

authors

Busch D,Greiner C,Rosenfeld KL,Ford R,de Wit J,Hoeijmakers JH,Thompson LH

doi

10.1093/mutage/9.4.301

subject

Has Abstract

pub_date

1994-07-01 00:00:00

pages

301-6

issue

4

eissn

0267-8357

issn

1464-3804

journal_volume

9

pub_type

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