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Gene expression metadata analysis reveals molecular mechanisms employed by Phanerochaete chrysosporium during lignin degradation and detoxification of plant extractives

Current Genetics volume 63, pages 877–894 (2017)Cite this article

Abstract

Lignin, most complex and abundant biopolymer on the earth’s surface, attains its stability from intricate polyphenolic units and non-phenolic bonds, making it difficult to depolymerize or separate from other units of biomass. Eccentric lignin degrading ability and availability of annotated genome make Phanerochaete chrysosporium ideal for studying lignin degrading mechanisms. Decoding and understanding the molecular mechanisms underlying the process of lignin degradation will significantly aid the progressing biofuel industries and lead to the production of commercially vital platform chemicals. In this study, we have performed a large-scale metadata analysis to understand the common gene expression patterns of P. chrysosporium during lignin degradation. Gene expression datasets were retrieved from NCBI GEO database and analyzed using GEO2R and Bioconductor packages. Commonly expressed statistically significant genes among different datasets were further considered to understand their involvement in lignin degradation and detoxification mechanisms. We have observed three sets of enzymes commonly expressed during ligninolytic conditions which were later classified into primary ligninolytic, aromatic compound-degrading and other necessary enzymes. Similarly, we have observed three sets of genes coding for detoxification and stress-responsive, phase I and phase II metabolic enzymes. Results obtained in this study indicate the coordinated action of enzymes involved in lignin depolymerization and detoxification-stress responses under ligninolytic conditions. We have developed tentative network of genes and enzymes involved in lignin degradation and detoxification mechanisms by P. chrysosporium based on the literature and results obtained in this study. However, ambiguity raised due to higher expression of several uncharacterized proteins necessitates for further proteomic studies in P. chrysosporium.

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Acknowledgements

This work was supported by NSERC-RDF Fund to Wensheng Qin and Ontario Trillium Scholarship (OTS) to Ayyappa Kumar Sista Kameshwar.

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  1. Department of Biology, Lakehead University, 955 Oliver Road, Thunder Bay, ON, P7B 5E1, Canada

    Ayyappa Kumar Sista Kameshwar & Wensheng Qin

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  1. Ayyappa Kumar Sista Kameshwar
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Correspondence to Wensheng Qin.

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Communicated by M. Kupiec.

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Kameshwar, A.K.S., Qin, W. Gene expression metadata analysis reveals molecular mechanisms employed by Phanerochaete chrysosporium during lignin degradation and detoxification of plant extractives. Curr Genet 63, 877–894 (2017). https://doi.org/10.1007/s00294-017-0686-7

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  • DOI: https://doi.org/10.1007/s00294-017-0686-7

Keywords

  • Phanerochaete chrysosporium
  • Transcriptome
  • Lignocellulose
  • Gene expression omnibus (GEO)
  • GEO2R
  • Detoxification responses
  • Phase I and phase II metabolic enzymes