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Molecular mechanisms involved in the production of chromosomal aberrations. I. Utilization of Neurospora endonuclease for the study of aberration production in G2 stage of the cell cycle

Journal Article:

Abstract

Chinese hamster ovary cells (CHO) were X-irradiated in G2 stage of the cell cycle and immediately treated, in the presence of inactivated Sendai virus, with Neurospora endonuclease (E.C. 3.1.4.), an enzyme which is specific for cleaving single-stranded DNA. With this treatment, the frequencies of all types of chromosome aberrations increased when compared to X-irradiated controls. These results are interpreted as due to the conversion of some of the X-ray induced single-stranded DNA breaks into double-strand breaks by this enzyme. Similar enhancement due to this enzyme was found following treatment with methyl methanesulfonate (MMS) and bleomycin, but not following UV and mitomycin C. Addition of Micrococcus endonuclease and Neurospora endonuclease to the cells did not alter the frequencies of aberrations induced by UV. The introduction of enzymes with specific DNA-repair function offers possibilities to probe into the molecular events involved in the formation of structural chromosome aberrations induced by different classes of physical and chemical mutagens.
Authors:
Natarajan, A T; Obe, G [1] 
  1. Rijksuniversiteit Leiden (Netherlands). J.A. Cohen Inst. voor Radiopathologie en Stralingsbescherming
Publication Date:
Oct 01, 1978
Product Type:
Journal Article
Reference Number:
AIX-10-441098; EDB-79-113531
Resource Relation:
Journal Name: Mutat. Res.; (Netherlands); Journal Volume: 52:1
Subject:
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.; ANIMAL CELLS; CHROMOSOMAL ABERRATIONS; CELL CYCLE; MUTATION FREQUENCY; BIOLOGICAL MODELS; RADIOINDUCTION; BLEOMYCIN; ENZYMES; HAMSTERS; METHYL METHANESULFONATE; MITOMYCIN; OVARIES; ULTRAVIOLET RADIATION; X RADIATION; ANIMALS; ANTIBIOTICS; ANTIMITOTIC DRUGS; BODY; DRUGS; ELECTROMAGNETIC RADIATION; ESTERS; FEMALE GENITALS; GONADS; IONIZING RADIATIONS; MAMMALS; MUTAGENS; MUTATIONS; ORGANIC COMPOUNDS; ORGANIC SULFUR COMPOUNDS; ORGANS; RADIATIONS; RODENTS; SULFONIC ACID ESTERS; VERTEBRATES; 560121* - Radiation Effects on Cells- External Source- (-1987); 560152 - Radiation Effects on Animals- Animals
OSTI ID:
6099782
Country of Origin:
Netherlands
Language:
English
Other Identifying Numbers:
Journal ID: CODEN: MUREA
Submitting Site:
INIS
Size:
Pages: 137-149
Announcement Date:

Journal Article:

Citation Formats

Natarajan, A T, and Obe, G. Molecular mechanisms involved in the production of chromosomal aberrations. I. Utilization of Neurospora endonuclease for the study of aberration production in G2 stage of the cell cycle. Netherlands: N. p., 1978. Web.
Natarajan, A T, & Obe, G. Molecular mechanisms involved in the production of chromosomal aberrations. I. Utilization of Neurospora endonuclease for the study of aberration production in G2 stage of the cell cycle. Netherlands.
Natarajan, A T, and Obe, G. 1978. "Molecular mechanisms involved in the production of chromosomal aberrations. I. Utilization of Neurospora endonuclease for the study of aberration production in G2 stage of the cell cycle." Netherlands.
@misc{etde_6099782,
title = {Molecular mechanisms involved in the production of chromosomal aberrations. I. Utilization of Neurospora endonuclease for the study of aberration production in G2 stage of the cell cycle}
author = {Natarajan, A T, and Obe, G}
abstractNote = {Chinese hamster ovary cells (CHO) were X-irradiated in G2 stage of the cell cycle and immediately treated, in the presence of inactivated Sendai virus, with Neurospora endonuclease (E.C. 3.1.4.), an enzyme which is specific for cleaving single-stranded DNA. With this treatment, the frequencies of all types of chromosome aberrations increased when compared to X-irradiated controls. These results are interpreted as due to the conversion of some of the X-ray induced single-stranded DNA breaks into double-strand breaks by this enzyme. Similar enhancement due to this enzyme was found following treatment with methyl methanesulfonate (MMS) and bleomycin, but not following UV and mitomycin C. Addition of Micrococcus endonuclease and Neurospora endonuclease to the cells did not alter the frequencies of aberrations induced by UV. The introduction of enzymes with specific DNA-repair function offers possibilities to probe into the molecular events involved in the formation of structural chromosome aberrations induced by different classes of physical and chemical mutagens.}
journal = {Mutat. Res.; (Netherlands)}
volume = {52:1}
journal type = {AC}
place = {Netherlands}
year = {1978}
month = {Oct}
}