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Chen YZ, Rong WT, Qin YC, Lu LY, Liu J, Li MJ, Xin L, Li XD, Guan DL. Integrative analysis of microbiota and metabolomics in chromium-exposed silkworm ( Bombyx mori) midguts based on 16S rDNA sequencing and LC/MS metabolomics. Front Microbiol 2023; 14:1278271. [PMID: 37954243 PMCID: PMC10635416 DOI: 10.3389/fmicb.2023.1278271] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2023] [Accepted: 09/27/2023] [Indexed: 11/14/2023] Open
Abstract
The gut microbiota, a complex ecosystem integral to host wellbeing, is modulated by environmental triggers, including exposure to heavy metals such as chromium. This study aims to comprehensively explore chromium-induced gut microbiota and metabolomic shifts in the quintessential lepidopteran model organism, the silkworm (Bombyx mori). The research deployed 16S rDNA sequence analysis and LC/MS metabolomics in its experimental design, encompassing a control group alongside low (12 g/kg) and high (24 g/kg) feeding chromium dosing regimens. Considerable heterogeneity in microbial diversity resulted between groups. Weissella emerged as potentially resilient to chromium stress, while elevated Propionibacterium was noted in the high chromium treatment group. Differential analysis tools LEfSe and random forest estimation identified key species like like Cupriavidus and unspecified Myxococcales, offering potential avenues for bioremediation. An examination of gut functionality revealed alterations in the KEGG pathways correlated with biosynthesis and degradation, suggesting an adaptive metabolic response to chromium-mediated stress. Further results indicated consequential fallout in the context of metabolomic alterations. These included an uptick in histidine and dihydropyrimidine levels under moderate-dose exposure and a surge of gentisic acid with high-dose chromium exposure. These are critical players in diverse biological processes ranging from energy metabolism and stress response to immune regulation and antioxidative mechanisms. Correlative analyses between bacterial abundance and metabolites mapped noteworthy relationships between marker bacterial species, such as Weissella and Pelomonas, and specific metabolites, emphasizing their roles in enzyme regulation, synaptic processes, and lipid metabolism. Probiotic bacteria showed robust correlations with metabolites implicated in stress response, lipid metabolism, and antioxidant processes. Our study reaffirms the intricate ties between gut microbiota and metabolite profiles and decodes some systemic adaptations under heavy-metal stress. It provides valuable insights into ecological and toxicological aspects of chromium exposure that can potentially influence silkworm resilience.
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Affiliation(s)
- Ya-Zhen Chen
- Guangxi Key Laboratory of Sericulture Ecology and Applied Intelligent Technology, Hechi University, Hechi, China
- Guangxi Collaborative Innovation Center of Modern Sericulture and Silk, Hechi University, Hechi, China
| | - Wan-Tao Rong
- Guangxi Key Laboratory of Sericulture Ecology and Applied Intelligent Technology, Hechi University, Hechi, China
- Guangxi Collaborative Innovation Center of Modern Sericulture and Silk, Hechi University, Hechi, China
| | - Ying-Can Qin
- Guangxi Key Laboratory of Sericulture Ecology and Applied Intelligent Technology, Hechi University, Hechi, China
- Guangxi Collaborative Innovation Center of Modern Sericulture and Silk, Hechi University, Hechi, China
| | - Lin-Yuan Lu
- Guangxi Key Laboratory of Sericulture Ecology and Applied Intelligent Technology, Hechi University, Hechi, China
- Guangxi Collaborative Innovation Center of Modern Sericulture and Silk, Hechi University, Hechi, China
| | - Jing Liu
- Guangxi Key Laboratory of Sericulture Ecology and Applied Intelligent Technology, Hechi University, Hechi, China
- Guangxi Collaborative Innovation Center of Modern Sericulture and Silk, Hechi University, Hechi, China
| | - Ming-Jie Li
- Guangxi Key Laboratory of Sericulture Ecology and Applied Intelligent Technology, Hechi University, Hechi, China
- Guangxi Collaborative Innovation Center of Modern Sericulture and Silk, Hechi University, Hechi, China
| | - Lei Xin
- Guangxi Key Laboratory of Sericulture Ecology and Applied Intelligent Technology, Hechi University, Hechi, China
- Guangxi Collaborative Innovation Center of Modern Sericulture and Silk, Hechi University, Hechi, China
| | - Xiao-Dong Li
- Guangxi Key Laboratory of Sericulture Ecology and Applied Intelligent Technology, Hechi University, Hechi, China
- Guangxi Collaborative Innovation Center of Modern Sericulture and Silk, Hechi University, Hechi, China
| | - De-Long Guan
- Guangxi Key Laboratory of Sericulture Ecology and Applied Intelligent Technology, Hechi University, Hechi, China
- Guangxi Collaborative Innovation Center of Modern Sericulture and Silk, Hechi University, Hechi, China
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Patterns in Genotype Composition of Indian Isolates of the Bombyx mori Nucleopolyhedrovirus and Bombyx mori Bidensovirus. Viruses 2021; 13:v13050901. [PMID: 34068017 PMCID: PMC8152266 DOI: 10.3390/v13050901] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Revised: 05/05/2021] [Accepted: 05/11/2021] [Indexed: 11/17/2022] Open
Abstract
The mulberry silkworm, Bombyx mori (L.), is a model organism of lepidopteran insects with high economic importance. The viral diseases of the silkworm caused by Bombyx mori nucleopolyhedrovirus (BmNPV) and Bombyx mori bidensovirus (BmBDV) inflict huge economic losses and significantly impact the sericulture industry of India and other countries. To understand the distribution of Indian isolates of the BmNPV and to investigate their genetic composition, an in-depth population structure analysis was conducted using comprehensive and newly developed genomic analysis methods. The seven new Indian BmNPV isolates from Anantapur, Dehradun, Ghumarwin, Jammu, Kashmir, Mysore and Salem grouped in the BmNPV clade, and are most closely related to Autographa californica multiple nucleopolyhedrovirus and Rachiplusia ou multiple nucleopolyhedrovirus on the basis of gene sequencing and phylogenetic analyses of the partial polh, lef-8 and lef-9 gene fragments. The whole genome sequencing of three Indian BmNPV isolates from Mysore (-My), Jammu (-Ja) and Dehradun (-De) was conducted, and intra-isolate genetic variability was analyzed on the basis of variable SNP positions and the frequencies of alternative nucleotides. The results revealed that the BmNPV-De and BmNPV-Ja isolates are highly similar in their genotypic composition, whereas the population structure of BmNPV-My appeared rather pure and homogenous, with almost no or few genetic variations. The BmNPV-De and BmNPV-Ja samples further contained a significant amount of BmBDV belonging to the Bidnaviridae family. We elucidated the genotype composition within Indian BmNPV and BmBDV isolates, and the results presented have broad implications for our understanding of the genetic diversity and evolution of BmNPV and co-occurring BmBDV isolates.
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Senem JV, Torquato EFB, de Fátima Chasko Ribeiro L, Brancalhão RMC. Cytopathology of the trachea of Bombyx mori (Lepidoptera: Bombycidae) to Bombyx mori nucleopolyhedrovirus. Micron 2016; 80:39-44. [DOI: 10.1016/j.micron.2015.09.005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2015] [Revised: 09/04/2015] [Accepted: 09/07/2015] [Indexed: 11/28/2022]
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Craveiro SR, Melo FL, Ribeiro ZMA, Ribeiro BM, Báo SN, Inglis PW, Castro MEB. Pseudoplusia includens single nucleopolyhedrovirus: genetic diversity, phylogeny and hypervariability of the pif-2 gene. J Invertebr Pathol 2013; 114:258-67. [PMID: 24012501 DOI: 10.1016/j.jip.2013.08.005] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2013] [Revised: 08/16/2013] [Accepted: 08/22/2013] [Indexed: 11/30/2022]
Abstract
The soybean looper (Pseudoplusia includens Walker, 1857) has become a major pest of soybean crops in Brazil. In order to determine the genetic diversity and phylogeny of variants of Pseudoplusia includens single nucleopolyhedrovirus (PsinSNPV-IA to -IG), partial sequences of the genes lef-8, lef-9, pif-2, phr and polh were obtained following degenerate PCR and phylogenetic trees constructed using maximum parsimony and Bayesian methods. The aligned sequences showed polymorphisms among the isolates, where the pif-2 gene was by far the most variable and is predicted to be under positive selection. Furthermore, some of the pif-2 DNA sequence mutations are predicted to result in significant amino acid substitutions, possibly leading to changes in oral infectivity of this baculovirus. Cladistic analysis revealed two closely related monophyletic groups, one containing PsinNPV isolates IB, IC and ID and another containing isolates IA, IE, IF and IG. The phylogeny of PsinSNPV in relation to 56 other baculoviruses was also determined from the concatenated partial LEF-8, LEF-9, PIF-2 and POLH/GRAN deduced amino acid sequences, using maximum-parsimony and Bayesian methods. This analysis clearly places PsinSNPV with the Group II Alphabaculovirus, where PsinSNPV is most closely related to Chrysodeixis chalcites NPV and Trichoplusia ni SNPV.
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Affiliation(s)
- Saluana R Craveiro
- Departamento de Biologia Celular, Universidade de Brasília-UnB, Brasília, DF, Brazil; Embrapa Recursos Genéticos e Biotecnologia, Parque Estação Biológica, W5 Norte Final, 70770-917 Brasília, DF, Brazil
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