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  1. NTU Theses and Dissertations Repository
  2. 生物資源暨農學院
  3. 植物病理與微生物學系
請用此 Handle URI 來引用此文件: http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/96173
完整後設資料紀錄
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dc.contributor.advisor歐海仁zh_TW
dc.contributor.advisorHiran A. Ariyawansaen
dc.contributor.author林祐楨zh_TW
dc.contributor.authorYu-Chen Linen
dc.date.accessioned2024-11-19T16:09:45Z-
dc.date.available2024-11-20-
dc.date.copyright2024-11-19-
dc.date.issued2024-
dc.date.submitted2024-11-13-
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dc.identifier.urihttp://tdr.lib.ntu.edu.tw/jspui/handle/123456789/96173-
dc.description.abstract蟲草屬類群主要由昆蟲病原菌組成,其中多個物種在東亞被視為傳統藥材。近期研究中,Chuang 等人(2024)描述了來自臺灣的五個新種蟲草(Cordyceps hehuanensis、C. locastrae、C. malleiformis、C. pseudorosea 和 C. siangyangensis)。本研究初步探討了這五個新種與兩株 C. militaris 菌株的基因體多樣性,並進行全新的生物合成基因簇(BGCs)預測。本研究選取的蟲草屬物種以 Nanopore 長讀序列技術進行高品質基因體定序,並分析整個屬內的基因體特徵。從5098個直系同源基因 (single-copy orthologous) 獲得的基因體親緣演化樹所代表的演化關係,與從 ITS、nrLSU、tef1-α、rpb1和rpb2 片段獲得的多基因親緣演化樹具有相同的樹型結構。此外,average nucleotide identity (ANI)、average amino acid identity (AAI) 與percentage of conserved proteins (POCP) 的結果建議一致的蟲草屬物種界定。Biosynthetic gene cluster (BGC) 預測結果揭示了蟲草屬內代謝物的多樣性,其中如 beauvericin、beauverolide 和蟲草素等代謝物多樣性內演化存在一定的相關性。另外,Chuang(2020)對這七隻蟲草菌株的生物活性潛力進行了評估,特別探討了其蟲草素的生成能力。蟲草素為蟲草屬類群大量研究之生物活性物質,而該研究結果顯示僅有 C. militaris 和 C. hehuanensis 能夠生成蟲草素。然而近期研究指出,不產生蟲草素的蟲草屬物種同樣具有生物活性,這指出這些生物活性可能來源於其他代謝物。本研究假設臺灣新發現的蟲草屬物種中的生物活性可能來源於蟲草素以外的代謝物,並通過測定總酚含量、總黃酮含量、抗發炎活性和抗癌活性進行評估。在這些物種中,不產生蟲草素的 C. pseudorosea 顯示出與或超過產生蟲草素物種(C. militaris 和 C. hehuanensis)相當的抗癌潛力,而 C. locastrae、C. malleiformis 和 C. siangyangensis 則未顯示顯著的生物活性。
為了進一步了解這些物種間生物活性的差異,本研究使用 UHPLC-MS/MS 進行 untargeted 代謝體學分析,針對具細胞毒性和無細胞毒性物種(C. pseudorosea、C. locastrae 和 C. militaris)進行代謝物分析。主成分分析(PCA)和正交最小二偏差判別分析(OPLS-DA)揭示這三個物種間的明顯分群。在鑑定出的 208 種代謝物中,C. pseudorosea 顯著產生更多的 4-acetamidobutanoic acid、thalidomide、clozapine、biotin、salicylamide 和 (R)-(E)-sulforaphene,這些化合物可能作為潛在的生物標記物。值得注意的是,其中部分代謝物從未在真菌中報導過,故需要進一步分析或驗證以釐清預測結果。本研究鑑定了臺灣具生物活性的蟲草屬物種,並提供了其基因體和代謝體的全面見解。
zh_TW
dc.description.abstractThe cordyceps-like species mainly consist of entomopathogenic fungi, with several species traditionally used in Eastern medicine. In a recent study, Chuang et al. (2024) described five new Cordyceps species (Cordyceps hehuanensis, C. locastrae, C. malleiformis, C. pseudorosea, and C. siangyangensis) from Taiwan. The present study initially explored the genomic diversity of these five new Cordyceps species together with two C. militaris strains and predicted their Biosynthetic gene clusters (BGCs) de novo. Selected Cordyceps species were sequenced using Nanopore long reads to provide high-quality genomes and analyze the general genomic features across the whole genus. The evolutionary relationship represented in the phylogenomic tree obtained from 5098 single-copy orthologous genes showed identical topology with the multi-locus phylogenetic tree obtained from ITS, nrLSU, tef1-α, rpb1, and rpb2 regions. Additionally, pairwise genome comparisons, including average nucleotide identity (ANI), average amino acid identity (AAI), and the percentage of conserved proteins (POCP), suggested a consistent pattern in their species delineation. Furthermore, BGCs were predicted to elucidate the metabolic diversity among Cordyceps species. The annotated BGCs, such as beauvericin, beauverolide, and cordycepin, exhibit a loss-based correlation with the evolutionary relationships within the genus.
The bioactivity potential of these seven Cordyceps strains was assessed by Chuang (2020) by evaluating their cordycepin-production, a compound with significant medicinal potential. The results demonstrated that only C. militaris and C. hehuanensis were capable of producing cordycepin. However, recent findings suggested that non-cordycepin-producing Cordyceps species also exhibit bioactivities, indicating other metabolites may contribute to the observed bioactivities. The current study hypothesizes that metabolites other than cordycepin may contribute to the bioactivity observed in the Cordyceps species introduced in Taiwan. The bioactivities were evaluated by assessing total phenolic content, total flavonoid content, anti-inflammatory activity, and anti-cancer activity. Among these species, the non-cordycepin producing species, C. pseudorosea exhibited anti-cancer potential comparable to or exceeding that of cordycepin-producing species (C. militaris and C. hehuanensis), while other non-cordycepin species such as C. locastrae, C. malleiformis, and C. siangyangensis did not show significant bioactivities.
To understand the bioactivity variation among these species, the present study, further conducted untargeted metabolomics using UHPLC-MS/MS to analyze the metabolomic profiles of cytotoxic and non-cytotoxic species, namely C. pseudorosea, C. locastrae, and C. militaris. Principal component analysis (PCA) and orthogonal partial least squares discriminant analysis (OPLS-DA) revealed distinct groupings among the three species. Among the 208 identified metabolites, C. pseudorosea produced significantly more 4-acetamidobutanoic acid, thalidomide, clozapine, biotin, salicylamide, and (R)-(E)-sulforaphene compared to C. locastrae, suggesting these compounds as potential biomarkers. Notably, some of the identified metabolites have never been reported from fungal materials, and further analysis or validation is required to clarify the current prediction. Overall, this study identified bioactive Cordyceps species in Taiwan and provided comprehensive insights into their genomic and metabolomic profiles.
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dc.description.tableofcontents致謝 i
Acknowledgment iii
摘要 vi
Abstract viii
Table of Contents xi
List of Tables xv
List of Figures xvi
Chapter One. Comparative genomics of Genus Cordyceps 1
Introduction 1
Materials and Methods 4
Strain selection for comparative genomic analysis 4
Fungal cultivation and genome extraction 6
Nanopore sequencing, genome assembly, prediction, and annotation 7
Phylogenomics and comparative genomics of Cordyceps 8
Biosynthetic gene clusters (BGCs) analysis 9
Results 10
Dataset preparation 10
General genomic features 11
Phylogenomic Analysis 12
Comparative genomics 13
Biosynthetic gene clusters (BGCs) prediction 14
Identification of BGCs for the metabolite diversity of Cordyceps 15
Discussion 16
Chapter Two. Biochemical and bioactivity screening of new Taiwanese Cordyceps 21
Introduction 21
General information and traditional use of cordyceps-like fungi 21
Chemical properties of cordyceps-like fungi 22
Bioactivities of cordyceps-like fungi 23
Previous studies on bioactivity screening of cordyceps-like fungi in Taiwan 24
Hypothesis and experimental design 26
Materials and Methods 27
Fungal cultivation and metabolite extraction 27
Chemical property screening 28
Anti-cancer screening 29
Anti-inflammation screening 30
Statistical analysis and visualization 31
Results 31
Fungal cultivation and extraction 31
Chemical properties of methanolic extract of 32
Anti-cancer potential of Cordyceps methanolic extract 33
Anti-inflammation potential of Cordyceps methanolic extract 34
Discussion 35
Biochemical properties and Anti-oxidation activit 35
Species with anti-cancer potential 36
Species with anti-inflammation potential 37
Strains selection for further analysis 39
Chapter Three. Comparative metabolomics of cytotoxic and non-cytotoxic Cordyceps (Preliminary Data) 40
Introduction 40
Metabolomic studies of cordyceps-like fungi 40
General information of metabolomic analysis 41
Hypothesis and experimental design 42
Materials and Methods 44
Fungal cultivation and extraction 44
UPLC-MS/MS analysis for untargeted metabolomics 44
Data acquisition and processing 45
Statistical analysis 45
Results 46
Quality control of untargeted metabolomic profiling 46
The metabolic variations among the three Cordyceps species 47
Screening and classification of the differential metabolites 47
KEGG Pathway analysis 49
Discussion 49
General Conclusion 52
References 55
Tables 80
Figures 100
Supplementary Materials 113
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dc.language.isoen-
dc.subject代謝體zh_TW
dc.subject演化zh_TW
dc.subject比較基因體學zh_TW
dc.subject生物活性zh_TW
dc.subjectmetabolomeen
dc.subjectbioactivityen
dc.subjectcomparative genomicsen
dc.subjectevolutionen
dc.title利用比較基因體學與代謝體學研究臺灣新種蟲草的功能性基因及生物活性zh_TW
dc.titleStudy of functional genomics and bioactivities of Taiwan novel Cordyceps species using comparative genomics and metabolomicsen
dc.typeThesis-
dc.date.schoolyear113-1-
dc.description.degree碩士-
dc.contributor.oralexamcommittee沈湯龍;張皓巽;黃良得zh_TW
dc.contributor.oralexamcommitteeTang-Long Shen;Hao-Xun Chang;Lean-Teik Ngen
dc.subject.keyword生物活性,比較基因體學,演化,代謝體,zh_TW
dc.subject.keywordbioactivity,comparative genomics,evolution,metabolome,en
dc.relation.page159-
dc.identifier.doi10.6342/NTU202404572-
dc.rights.note同意授權(全球公開)-
dc.date.accepted2024-11-13-
dc.contributor.author-college生物資源暨農學院-
dc.contributor.author-dept植物病理與微生物學系-
顯示於系所單位:植物病理與微生物學系

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