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A biomarker model of sublethal genotoxicity (DNA single-strand breaks and adducts) using the sentinel organism Aporrectodea longa in spiked soil.

Martin, Francis L. and Piearce, Trevor G. and Hewer, Alan and Phillips, David H. and Semple, Kirk T. (2005) A biomarker model of sublethal genotoxicity (DNA single-strand breaks and adducts) using the sentinel organism Aporrectodea longa in spiked soil. Environmental Pollution, 138 (2). pp. 307-315. ISSN 0269-7491

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Abstract

There is a need to develop risk biomarkers during the remediation of contaminated land. We employed the earthworm, Aporrectodea longa (Ude), to determine whether genotoxicity measures could be applied to this organism's intestinal tissues. Earthworms were added, for 24 h or 7 days, to soil samples spiked with benzo[a]pyrene (B[a]P) and/or lindane. After exposure, intestinal tissues (crop/gizzard or intestine) were removed prior to the measurement in disaggregated cells of DNA single-strand breaks (SSBs) by the alkaline comet assay. Damage was quantified by comet tail length (CTL, μm). B[a]P 24-h exposure induced dose-related increases (P<0.0001) in SSBs. Earthworm intestine was significantly (P<0.0001) more susceptible than crop/gizzard to B[a]P and/or lindane. However, both tissues appeared to acquire resistance following 7-day exposure. B[a]P-DNA adducts, measured by 32P-postlabelling, showed a two-adduct-spot pattern. This preliminary investigation suggests that earthworm tissues may be incorporated into genotoxicity assays to facilitate hazard identification within terrestrial ecosystems.

Item Type: Article
Journal or Publication Title: Environmental Pollution
Uncontrolled Keywords: Adducts ; Benzo[a]pyrene ; Contaminated soil ; Comet assay ; DNA single-strand breaks ; Earthworms
Subjects: Q Science > QH Natural history > QH301 Biology
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 9183
Deposited By: Dr Francis L Martin
Deposited On: 30 May 2008 13:54
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 18:33
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/9183

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