1
|
da Silva HE, Benvindo-Souza M, Silva DDME, Filho NRA. Genotoxic and mutagenic evaluation in Eisenia foetida annelids exposed to iron ore tailings from the region of Brumadinho, MG, Brazil. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2023; 102:104247. [PMID: 37586653 DOI: 10.1016/j.etap.2023.104247] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2023] [Revised: 07/16/2023] [Accepted: 08/13/2023] [Indexed: 08/18/2023]
Abstract
Soils that have a disproportion of metallic elements due to anthropic activities endanger the terrestrial fauna. This study evaluated whether earthworms (Eisenia foetida) exposed to ore tailings from Brumadinho region presented a higher frequency of genotoxic and mutagenic damages than annelids from a reference area (control). The animals were exposed to substrates containing 0%, 25%, 50%, 75%, and 100% iron mining waste. The results indicated increased DNA damage (p < 0.05), detected by the comet assay at 25% and 50%. There was a three-fold increase in micronuclei in animals on the substrates with the highest concentrations (75% and 100%) [F = 3.095; p = 0.02]. The earthworms lost weight as the percentage of mining waste increased. We concluded that E. foetida presented DNA damage in the contaminated soils of Brumadinho. However, more research is fundamental, once the environmental disaster in Brumadinho was one of the biggest mining catastrophe in Brazil.
Collapse
Affiliation(s)
- Hélio Elias da Silva
- Laboratory of Extraction and Separation Methods, Institute of Chemistry, Federal University of Goiás, Goiânia, Goiás, Brazil.
| | - Marcelino Benvindo-Souza
- Postgraduate Program in Natural Resources of the Cerrado at the State University of Goiás, Anápolis, Brazil; Laboratory of Mutagenesis, Department of Genetics. Federal University of Goiás, Goiânia, Goiás, Brazil
| | - Daniela de Melo E Silva
- Laboratory of Mutagenesis, Department of Genetics. Federal University of Goiás, Goiânia, Goiás, Brazil
| | - Nelson Roberto Antoniosi Filho
- Laboratory of Extraction and Separation Methods, Institute of Chemistry, Federal University of Goiás, Goiânia, Goiás, Brazil
| |
Collapse
|
2
|
Diaz Arenas C, Ardaševa A, Miller J, Mikheyev AS, Yokobayashi Y. Ribozyme Mutagenic Evolution: Mechanisms of Survival. ORIGINS LIFE EVOL B 2022; 51:321-339. [PMID: 34994918 DOI: 10.1007/s11084-021-09617-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2021] [Accepted: 11/16/2021] [Indexed: 11/24/2022]
Abstract
Primeval populations replicating at high error rates required a mechanism to overcome the accumulation of mutations and information deterioration. Known strategies to overcome mutation pressures include RNA processivity, epistasis, selection, and quasispecies. We investigated the mechanism by which small molecular ribozyme populations can survive under high error rates by propagating several lineages under different mutagen concentrations. We found that every population that evolved without mutagen went extinct, while those subjected to mutagenic evolution survived. To understand how they survived, we characterized the evolved genotypic diversity, the formation of genotype-genotype interaction networks, the fitness of the most common mutants for each enzymatic step, and changes in population size along the course of evolution. We found that the elevated mutation rate was necessary for the populations to survive in the novel environment, in which all the steps of the metabolism worked to promote the survival of even less catalytically efficient ligases. Besides, an increase in population size and the mutational coupling of genotypes in close-knit networks, which helped maintain or recover lost genotypes making their disappearance transient, prevented Muller's ratchet and extinction.
Collapse
Affiliation(s)
- Carolina Diaz Arenas
- Okinawa Institute of Science and Technology Graduate University (OIST), Okinawa Prefecture, Japan. .,Yale University, New Haven, CT, USA.
| | - Aleksandra Ardaševa
- Wolfson Centre for Mathematical Biology, Mathematical Institute, University of Oxford, Oxford, UK
| | - Jonathan Miller
- Okinawa Institute of Science and Technology Graduate University (OIST), Okinawa Prefecture, Japan
| | - Alexander S Mikheyev
- Okinawa Institute of Science and Technology Graduate University (OIST), Okinawa Prefecture, Japan.,Evolutionary Genomics Lab, Research School of Biology, Australian National University, Canberra, Australia
| | - Yohei Yokobayashi
- Okinawa Institute of Science and Technology Graduate University (OIST), Okinawa Prefecture, Japan
| |
Collapse
|
3
|
Effects of Manganese on Genomic Integrity in the Multicellular Model Organism Caenorhabditis elegans. Int J Mol Sci 2021; 22:ijms222010905. [PMID: 34681565 PMCID: PMC8535284 DOI: 10.3390/ijms222010905] [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: 09/05/2021] [Revised: 09/24/2021] [Accepted: 09/30/2021] [Indexed: 12/30/2022] Open
Abstract
Although manganese (Mn) is an essential trace element, overexposure is associated with Mn-induced toxicity and neurological dysfunction. Even though Mn-induced oxidative stress is discussed extensively, neither the underlying mechanisms of the potential consequences of Mn-induced oxidative stress on DNA damage and DNA repair, nor the possibly resulting toxicity are characterized yet. In this study, we use the model organism Caenorhabditis elegans to investigate the mode of action of Mn toxicity, focusing on genomic integrity by means of DNA damage and DNA damage response. Experiments were conducted to analyze Mn bioavailability, lethality, and induction of DNA damage. Different deletion mutant strains were then used to investigate the role of base excision repair (BER) and dePARylation (DNA damage response) proteins in Mn-induced toxicity. The results indicate a dose- and time-dependent uptake of Mn, resulting in increased lethality. Excessive exposure to Mn decreases genomic integrity and activates BER. Altogether, this study characterizes the consequences of Mn exposure on genomic integrity and therefore broadens the molecular understanding of pathways underlying Mn-induced toxicity. Additionally, studying the basal poly(ADP-ribosylation) (PARylation) of worms lacking poly(ADP-ribose) glycohydrolase (PARG) parg-1 or parg-2 (two orthologue of PARG), indicates that parg-1 accounts for most of the glycohydrolase activity in worms.
Collapse
|
4
|
Liu K, Li C, Dai C, Qin R, Liang X, Li Y, Yu F. A novel role of sulfate in promoting Mn phytoextraction efficiency and alleviating Mn stress in Polygonum lapathifolium Linn. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2021; 213:112036. [PMID: 33588187 DOI: 10.1016/j.ecoenv.2021.112036] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2020] [Revised: 01/27/2021] [Accepted: 01/31/2021] [Indexed: 06/12/2023]
Abstract
A hydroponic method was performed to explore the effects of sulfate supply on the growth, manganese (Mn) accumulation efficiency and Mn stress alleviation mechanisms of Polygonum lapathifolium Linn. Three Mn concentrations (1, 8 and 16 mmol L-1, representing low (Mn1), medium (Mn8) and high (Mn16) concentrations, respectively) were used. Three sulfate (S) levels (0, 200, and 400 μmol L-1, abbreviated as S0, S200 and S400, respectively) were applied for each Mn concentration. (1) The average biomass (g plant-1) of P. lapathifolium was ordered as Mn8 (6.36) > Mn1 (5.25) > Mn16 (4.16). Under Mn16 treatment, S addition increased (P < 0.05) biomass by 29.96% (S200) and 53.07% (S400) compared to that S0. The changes in the net photosynthetic rate and mean daily increase in biomass were generally consistent with the changes in biomass. (2) Mn accumulation efficiency (g plant-1) was ordered as Mn8 (99.66) > Mn16 (58.33) > Mn1 (27.38); and S addition increased (p < 0.05) plant Mn accumulation and Mn transport, especially under Mn16 treatment. (3) In general, antioxidant enzyme activities (AEAs) and malondialdehyde (MDA) in plant leaves were ordered in Mn16 > Mn8 > Mn1. Sulfate addition decreased (P < 0.05) AEAs and MDA under Mn16 treatment, while the changes were minor under Mn1 and Mn8 treatments. (4) Amino acid concentrations generally increased with increasing Mn concentration and S level. In summary, the medium Mn treatment promoted plant growth and Mn bioaccumulation; sulfate, especially at 400 µmol L-1 S, can effectively promote plant growth and Mn accumulation efficiency. The most suitable bioremediation strategy was Mn16 with 400 µmol L-1 S.
Collapse
Affiliation(s)
- Kehui Liu
- Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection (Guangxi Normal University), the Ministry of Education, 541004 Guilin, China; College of Life Science, Guangxi Normal University, 541004 Guilin, China
| | - Chunming Li
- College of Life Science, Guangxi Normal University, 541004 Guilin, China; School of Life Sciences, Fudan University, 200438 Shanghai, China
| | - Chenglong Dai
- Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection (Guangxi Normal University), the Ministry of Education, 541004 Guilin, China; College of Life Science, Guangxi Normal University, 541004 Guilin, China
| | - Rilan Qin
- Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection (Guangxi Normal University), the Ministry of Education, 541004 Guilin, China; College of Life Science, Guangxi Normal University, 541004 Guilin, China
| | - Xiaolu Liang
- Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection (Guangxi Normal University), the Ministry of Education, 541004 Guilin, China; College of Life Science, Guangxi Normal University, 541004 Guilin, China
| | - Yi Li
- Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection (Guangxi Normal University), the Ministry of Education, 541004 Guilin, China; College of Environment and Resource, Guangxi Normal University, 541004 Guilin, China.
| | - Fangming Yu
- Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection (Guangxi Normal University), the Ministry of Education, 541004 Guilin, China; College of Environment and Resource, Guangxi Normal University, 541004 Guilin, China.
| |
Collapse
|
5
|
Monakhova MV, Penkina AI, Pavlova AV, Lyaschuk AM, Kucherenko VV, Alexeevski AV, Lunin VG, Friedhoff P, Klug G, Oretskaya TS, Kubareva EA. Endonuclease Activity of MutL Protein of the Rhodobacter sphaeroides Mismatch Repair System. BIOCHEMISTRY. BIOKHIMIIA 2018; 83:281-293. [PMID: 29625547 DOI: 10.1134/s0006297918030082] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
We have purified the MutL protein from Rhodobacter sphaeroides mismatch repair system (rsMutL) for the first time. rsMutL demonstrated endonuclease activity in vitro, as predicted by bioinformatics analysis. Based on the alignment of 1483 sequences of bacterial MutL homologs with presumed endonuclease activity, conserved functional motifs and amino acid residues in the rsMutL sequence were identified: five motifs comprising the catalytic site responsible for DNA cleavage were found in the C-terminal domain; seven conserved motifs involved in ATP binding and hydrolysis and specific to the GHKL family of ATPases were found in the N-terminal domain. rsMutL demonstrated the highest activity in the presence of Mn2+. The extent of plasmid DNA hydrolysis declined in the row Mn2+ > Co2+ > Mg2+ > Cd2+; Ni2+ and Ca2+ did not activate rsMutL. Divalent zinc ions inhibited rsMutL endonuclease activity in the presence of Mn2+ excess. ATP also suppressed plasmid DNA hydrolysis by rsMutL. Analysis of amino acid sequences and biochemical properties of five studied bacterial MutL homologs with endonuclease activity revealed that rsMutL resembles the MutL proteins from Neisseria gonorrhoeae and Pseudomonas aeruginosa.
Collapse
Affiliation(s)
- M V Monakhova
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, 119991, Russia.
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|