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Metatranscriptomics As a Tool to Identify Fungal Species and Subspecies in Mixed Communities

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Metatranscriptomics As a Tool to Identify Fungal Species and Subspecies in Mixed Communities bioRxiv preprint doi: https://doi.org/10.1101/584649; this version posted March 21, 2019. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY-NC-ND 4.0 International license. 1 Metatranscriptomics as a tool to identify fungal species 2 and subspecies in mixed communities 3 4 5 Vanesa R. Marcelino1,2, Laszlo Irinyi1,2,3, John-Sebastian Eden1,2, Wieland Meyer1,2,3, Edward 6 C. Holmes1,4, Tania C. Sorrell1,2 7 8 9 1Marie Bashir Institute for Infectious Diseases and Biosecurity and Faculty of Medicine and 10 Health, Sydney Medical School, Westmead Clinical School, The University of Sydney, 11 Sydney, NSW 2006, Australia. 12 13 2Molecular Mycology Research Laboratory, Centre for Infectious Diseases and 14 Microbiology, Westmead Institute for Medical Research, Westmead, NSW 2145, Australia. 15 16 3Westmead Hospital (Research and Education Network), Westmead, NSW 2145, Australia. 17 18 4School of Life & Environmental Sciences, Charles Perkins Centre, The University of 19 Sydney, Sydney, NSW 2006, Australia. 20 1 bioRxiv preprint doi: https://doi.org/10.1101/584649; this version posted March 21, 2019. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY-NC-ND 4.0 International license. 21 Abstract 22 High-throughput sequencing (HTS) enables the generation of large amounts of genome 23 sequence data at a reasonable cost. Organisms in mixed microbial communities can now 24 be sequenced and identified in a culture-independent way, usually using amplicon 25 sequencing of a DNA barcode. Bulk RNA-seq (metatranscriptomics) has several 26 advantages over DNA-based amplicon sequencing: it is less susceptible to amplification 27 biases, it captures only living organisms, and it enables a larger set of genes to be used for 28 taxonomic identification. Using a defined mock community comprised of 17 fungal isolates, 29 we evaluated whether metatranscriptomics can accurately identify fungal species and 30 subspecies in mixed communities. Overall, 72.9% of the RNA transcripts were classified, 31 from which the vast majority (99.5%) were correctly identified at the species-level. Of the 15 32 species sequenced, 13 were retrieved and identified correctly. We also detected strain-level 33 variation within the Cryptococcus species complexes: 99.3% of transcripts assigned to 34 Cryptococcus were classified as one of the four strains used in the mock community. 35 Laboratory contaminants and/or misclassifications were diverse but represented only 36 0.44% of the transcripts. Hence, these results show that it is possible to obtain accurate 37 species- and strain-level fungal identification from metatranscriptome data as long as taxa 38 identified at low abundance are discarded to avoid false-positives derived from 39 contamination or misclassifications. This study therefore establishes a base-line for the 40 application of metatranscriptomics in clinical mycology and ecological studies. 2 bioRxiv preprint doi: https://doi.org/10.1101/584649; this version posted March 21, 2019. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY-NC-ND 4.0 International license. 41 Introduction 42 Microscopic fungal species, such as yeasts and some filamentous fungi, do not live in 43 isolation, they are most commonly found within mixed microbial communities inhabiting 44 soil, water systems, plants and animal hosts. Assessing the diversity of fungi in mixed 45 communities is important because different fungal taxa may exhibit distinctive phenotypes, 46 and consequently may have different pathogenicity or functional roles. For example, in the 47 rhizosphere, changes in fungal community composition have been associated with shifts in 48 nutrient cycling (Hannula et al. 2017). Humans also harbor, or are exposed to, a diverse 49 fungal community that provides a source of opportunistic pathogens (Bandara et al. 2019; 50 Huffnagle & Noverr 2013; Seed 2014). Although it is typically assumed that invasive fungal 51 infections are caused by a single strain, multiple Candida strains have been observed 52 during the course of a single episode of infection (Soll et al. 1988). Furthermore, nearly 20% 53 of patients with cryptococcosis are infected with multiple strains, with different phenotypes 54 and virulence traits (Desnos-Ollivier et al. 2015; Desnos-Ollivier et al. 2010). Strain-level 55 fungal diversity may influence therapeutic responsiveness and needs further investigation. 56 Despite its importance, fungal taxonomic diversity is poorly characterized. From 57 over two million fungal species estimated to exist, less than 8% have been described 58 (Hawksworth & Lucking 2017). Even well-known fungal species are often overlooked during 59 routine diagnostic procedures, surveillance and biodiversity surveys (Brown et al. 2012; 60 Enaud et al. 2018; Yahr et al. 2016). This is in part due to challenges in the detection and 61 classification of these organisms, especially microscopic and cryptic species, for example, 62 the etiologic agents of cryptococcosis. Currently, two species complexes are recognized: 63 Cryptococcus neoformans and Cryptococcus gattii (Kwon-Chung et al. 2002). Seven major 64 haploid lineages are found within these two species complexes (C. neoformans species 65 complex: VNI, VNII, VNIV, and C. gattii species complex: VGI, VGII, VGIII and VGIV) and 66 their recognition as distinct biological species has been debated (Hagen et al. 2015; Kwon- 67 Chung et al. 2017; Ngamskulrungroj et al. 2009). Being able to distinguish closely-related 68 lineages is important because their phenotype, virulence and ecophysiology can vary 69 substantially. For example, the JEC21 and B-3501 strains of C. neoformans var. 70 neoformans (VNIV) are 99.5% identical at the genomic sequence level but differ 71 substantially in thermotolerance and virulence (Loftus et al. 2005). Likewise, different 72 virulence and antifungal tolerance traits were observed within lineages of C. gattii VGIII 73 (Firacative et al. 2016). 74 The introduction of high-throughput sequencing (HTS) marked a new era in 75 mycological research, where the vast diversity of fungi can be studied without the need for 3 bioRxiv preprint doi: https://doi.org/10.1101/584649; this version posted March 21, 2019. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY-NC-ND 4.0 International license. 76 culture (Nilsson et al. 2019). To date, amplicon sequencing of marker genes 77 (metabarcoding) has been the most popular HTS method used to identify fungal species in 78 mixed communities. Despite its indisputable utility, metabarcoding surveys are affected by 79 PCR amplification biases, and even abundant species can go undetected due to primer 80 mismatch (Marcelino & Verbruggen 2016; Nilsson et al. 2019; Tedersoo et al. 2015). In 81 addition, DNA fragments from dead organisms inflate biodiversity estimates in 82 metabarcoding surveys (Carini et al. 2016). Stool samples, for instance, naturally contain 83 food-derived DNA, which cannot be distinguished from the genetic material of the resident 84 gut microbiota when using DNA-based methods. These challenges can be circumvented by 85 directly sequencing actively transcribed genes, via RNA-Seq, hence avoiding the 86 amplification step, and obtaining an unbiased characterization of the living microbial 87 community. Metatranscriptomics has been used to identify RNA viruses in a range of 88 animal samples (Shi et al. 2016; Shi et al. 2017; Wille et al. 2018; Zhang et al. 2018) and to 89 characterize the functional profile of microbial communities (Bashiardes et al. 2016; Kuske 90 et al. 2015). Studies applying metatranscriptomics to mycorrhizal communities have 91 provided valuable insights into the functional roles of fungi in these symbiotic systems 92 (Gonzalez et al. 2018; Liao et al. 2014). However, links between functional and species-level 93 taxonomy have been sought infrequently, likely because fungal identification from 94 metatranscriptome data is considered unreliable below phylum level (Nilsson et al. 2019). 95 Critically, it is currently unknown whether metatranscriptomics can accurately identify fungi 96 at the species and subspecies level within a mixed community. This information is 97 fundamental to the investigation of the potential and utility of metatranscriptomics in 98 diagnostics and ecological studies. 99 Herein, we evaluated the utility of metatranscriptomics as a tool for the 100 simultaneous identification of fungal species, using a defined mock community containing 101 15 fungal species. In addition, we investigated whether strains belonging to sister species, 102 such as the C. neoformans and C. gattii species complexes could be identified correctly 103 using metatranscriptomics. Rather than focusing on marker genes, we sought to classify 104 fungal species using the information from all expressed genes, using the totality of NCBI’s 105 nucleotide collection as a reference database. This study paves the way to apply state-of- 106 the
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