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Garde Sagardoy, Edurne

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https://academica-e.unavarra.es/handle/2454/52403

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Garde Sagardoy

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Edurne

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Agronomía, Biotecnología y Alimentación

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IMAB. Research Institute for Multidisciplinary Applied Biology

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0000-0002-5224-8257

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811615

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2023 - 20242
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Author: Jiménez Miguel, Idoia ×

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    PublicationOpen Access
    Transcriptome metabolic characterization of tuber borchii SP1-A new spanish strain for in vitro studies of the bianchetto truffle
    (MDPI, 2023) Chuina Tomazeli, Emilia; Alfaro Sánchez, Manuel; Zambonelli, Alessandra; Garde Sagardoy, Edurne; Pérez Garrido, María Gumersinda; Jiménez Miguel, Idoia; Ramírez Nasto, Lucía; Salman, Hesham; Pisabarro de Lucas, Gerardo; Institute for Multidisciplinary Research in Applied Biology - IMAB
    Truffles are ascomycete hypogeous fungi belonging to the Tuberaceae family of the Pezizales order that grow in ectomycorrhizal symbiosis with tree roots, and they are known for their peculiar aromas and flavors. The axenic culture of truffle mycelium is problematic because it is not possible in many cases, and the growth rate is meager when it is possible. This limitation has prompted searching and characterizing new strains that can be handled in laboratory conditions for basic and applied studies. In this work, a new strain of Tuber borchii (strain SP1) was isolated and cultured, and its transcriptome was analyzed under different in vitro culture conditions. The results showed that the highest growth of T. borchii SP1 was obtained using maltose-enriched cultures made with soft-agar and in static submerged cultures made at 22 °C. We analyzed the transcriptome of this strain cultured in different media to establish a framework for future comparative studies, paying particular attention to the central metabolic pathways, principal secondary metabolite gene clusters, and the genes involved in producing volatile aromatic compounds (VOCs). The results showed a transcription signal for around 80% of the annotated genes. In contrast, most of the transcription effort was concentrated on a limited number of genes (20% of genes account for 80% of the transcription), and the transcription profile of the central metabolism genes was similar in the different conditions analyzed. The gene expression profile suggests that T. borchii uses fermentative rather than respiratory metabolism in these cultures, even in aerobic conditions. Finally, there was a reduced expression of genes belonging to secondary metabolite clusters, whereas there was a significative transcription of those involved in producing volatile aromatic compounds.
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    PublicationOpen Access
    In silico analysis of the expression profile of AA9 Lytic Polysaccharide Monooxygenases (LPMOs) and the CDH Cellobiose Dehydrogenase enzyme in wood-degrader Agaricomycetes. The Pleurotus ostreatus case
    (Elsevier, 2024-08-22) Jiménez Miguel, Idoia; Roscales, Gabriel; Garde Sagardoy, Edurne; Chuina Tomazeli, Emilia; Honda, Yoichi; Lipzen, Anna; Lail, Kathleen; Bauer, Diane; Barry, Kerrie; Grigoriev, Igor V.; Ramírez L.; Ramírez Nasto, Lucía; Institute for Multidisciplinary Research in Applied Biology - IMAB; Universidad Pública de Navarra / Nafarroako Unibertsitate Publikoa
    Lignocellulose, the Earth's most abundant biopolymer, is degraded by wood-decaying fungi, specifically white rot fungi (WRF) and brown rot fungi (BRF), which use different strategies. This study examines the expression profiles of the AA9 and CDH enzymes of three WRF species (Heterobasidion annosum, Phanerochaete chrysosporium, and Pleurotus ostreatus) and two BRF species (Fomitopsis pinicola and Rhodonia placenta) from the Agaricomycetes class, grown on poplar wood or glucose as the sole carbon source. Mycelia were collected between days 10 and 12, revealing distinct lignocellulose degradation strategies between WRF and BRF, evidenced by the upregulation of AA9 LPMO (lytic polysaccharide monooxygenases) and AA3_1 (Cellobiose Dehydrogenase) genes, with the co-occurrence of both types of transcripts at the time of mycelial collection. The genome analysis showed variability in the number of AA9LPMO genes between WRF and BRF, which were differentially regulated depending on the carbon source. WRF exhibited a significant upregulation of AA9 LPMO genes,. In Phanerochaete chrysosporium, only one AA9LPMO gene was homologous to Pleurotus ostreatus, which had the highest number of AA9LPMO genes among the WRF studied. Some AA9 LPMO genes in Pleurotus ostreatus were associated to transposable elements (TEs, mainly footprints of LTRs) and grouped in clustered. LTRs were found either in the flanking or within the gene coding regions with no effect on gene transcription. In silico analysis of the AA9LPMO proteins in WRF uncovered distinct features at their C-terminal ends. Most of them lacked an appended module, but those with a CBM1 were highly induced in poplar wood media. The proportion of AA9 proteins with a CBM1 module was similar in Phanerochaete chrysosporium and Heterobasidion irregulare, but lower in Pleurotus ostreatus, which contained more AA9LPMO genes overall. In Pleurotus ostreatus, AA9LPMO proteins were grouped into three clades based on their C oxidizing type, with each clade containing proteins with specific features. The abundance (redundancy) of AA9LPMO genes in WRF especially associated to footprints LTRs in Pleurotus ostreatus suggests these genes may have other roles beyond lignocellulose degradation.