Differential synthesis and replication of DNA in the Neurospora crassa slime mutant versus normal cells: role of carcinogens.

Abstract:

:Small quantities of carcinogens, dl-ethionine, thiotepa, actinomycin D, and 1-(2-chloroethyl-3-cyclohexyl)-1-nitrosourea (CCNU) stimulated in vitro deoxyribonucleic acid (DNA) synthesis of the slime mutant of Neurospora crassa, while there was practically no effect on the DNA from the normal wild type 74A strain. All of these compounds caused increased strand separation in the mutant DNA of N. crassa, but no separation of normal DNA strands. The growth (in vivo tests) of the N. crassa slime mutant, but not its wild type, was markedly increased when nontoxic concentrations of one of the carcinogens (dl-ethionine) tested were present in the growth medium. These observations suggest that, unlike the wild type N. crassa, the slime mutant allows an excessive and unscheduled replication, indicating destabilized nature of its DNA.

journal_name

Oncology

journal_title

Oncology

authors

Beljanski M,Dutta SK

doi

10.1159/000226503

subject

Has Abstract

pub_date

1987-01-01 00:00:00

pages

327-30

issue

5

eissn

0030-2414

issn

1423-0232

journal_volume

44

pub_type

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