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Estimation of the Mutagenic Potential of 8-Oxog in Nuclear Extracts of Mouse Cells Using the "Framed Mirror" Method. Methods Protoc 2020; 3:mps3010003. [PMID: 31947764 PMCID: PMC7189664 DOI: 10.3390/mps3010003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2019] [Revised: 12/24/2019] [Accepted: 12/31/2019] [Indexed: 01/01/2023] Open
Abstract
We propose an improved earlier described “mirror” method for detecting in cell nuclear extracts mutations that arise in DNA during its replication due to the misincorporation of deoxyadenosine-5′-monophosphate (dAMP) opposite 7,8-dihydro-8-oxoguanine (8-oxoG). This method is based on the synthesis of a complementary chain (“mirror”) by nuclear extracts of different mice organs on a template containing 8-oxoG and dideoxycytidine residue (ddC) at the 3′‑end. The “mirror” was amplified by PCR using primers part of which was non-complementary to the template. It allowed obtaining the “framed mirror” products. The misincorporation of dAMP in “framed mirror” products forms an EcoRI restriction site. The restriction analysis of double-stranded “framed mirror” products allows a quantification of the mutation frequency in nuclear extracts. The data obtained show that the mutagenic potential of 8-oxoG markedly varied in different organs of adult mice and embryos.
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Duan M, Xiong D, Bai X, Gao Y, Xiong Y, Gao X, Ding G. Transgenerational effects of heavy fuel oil on the sea urchin Strongylocentrotus intermedius considering oxidative stress biomarkers. MARINE ENVIRONMENTAL RESEARCH 2018; 141:138-147. [PMID: 30177415 DOI: 10.1016/j.marenvres.2018.08.010] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2018] [Revised: 08/12/2018] [Accepted: 08/14/2018] [Indexed: 06/08/2023]
Abstract
Stranding of oil onto a coastline after an oil spill threatens the health of marine benthic organisms. Here, the transgenerational effects of exposure to stranded heavy fuel oil (HFO) on the sea urchin Strongylocentrotus intermedius were assessed. The column containing gravel coated with HFO was prepared in the laboratory to simulate HFO-contaminated gravel shorelines. Adult sea urchins were exposed for 21 days to either a HFO-oiled gravel column at the oil loading of 3000 μg oil/g gravel or a non-HFO-oiled gravel column (as the control treatment) and then offspring were either exposed to HFO or ambient seawater conditions. The sublethal exposure to HFO for 21 days induced polycyclic aromatic hydrocarbons (PAHs) accumulation in gonads, accompanied by increased levels of oxidative lipid, protein and DNA damage and a reduction in total antioxidant capacity. Analysis of gametes indicated that both maternal and paternal exposure could result in the transfer of PAHs and DNA damage to their offspring. Parental (maternal, paternal or both) exposure to HFO caused increases in malformation rates of offspring compared to those from control parents under ambient seawater condition. Continued HFO exposure in the offspring resulted in further increased malformation rates compared with those reared in ambient seawater, as well as oxidative lipid, protein and DNA damage. Furthermore, mother exposure history reduced the total antioxidant capacity of larvae to response to continued HFO exposure. Overall, the results suggest an increased sensitivity to toxic effects of HFO in larvae from exposed both parents compared with those from control parents in S. intermedius, which may consequently affect the recruitment and population maintenance.
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Affiliation(s)
- Meina Duan
- School of Environmental Science and Engineering, Dalian Maritime University, Dalian, 116026, Liaoning, China
| | - Deqi Xiong
- School of Environmental Science and Engineering, Dalian Maritime University, Dalian, 116026, Liaoning, China.
| | - Xue Bai
- School of Environmental Science and Engineering, Dalian Maritime University, Dalian, 116026, Liaoning, China
| | - Yali Gao
- School of Environmental Science and Engineering, Dalian Maritime University, Dalian, 116026, Liaoning, China
| | - Yijun Xiong
- Department of Biological Chemistry, Grinnell College, 1115 8th Ave, Grinnell, IA, 50112, USA
| | - Xiang Gao
- School of Environmental Science and Engineering, Dalian Maritime University, Dalian, 116026, Liaoning, China
| | - Guanghui Ding
- School of Environmental Science and Engineering, Dalian Maritime University, Dalian, 116026, Liaoning, China
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Zakharcheva KA, Gening LV, Kazachenko KY, Tarantul VZ. Cells resistant to toxic concentrations of manganese have increased ability to repair DNA. BIOCHEMISTRY (MOSCOW) 2017; 82:38-45. [DOI: 10.1134/s0006297917010047] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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