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University of Groningen Cultivation of Bacteria from Aplysina Aerophoba University of Groningen Cultivation of Bacteria From Aplysina aerophoba: Effects of Oxygen and Nutrient Gradients Gutleben, J.; Loureiro, C.; Ramírez Romero, L.A.; Shetty, S.; Wijffels, R.H.; Smidt, H.; Sipkema, D. Published in: Frontiers in Microbiology DOI: 10.3389/fmicb.2020.00175 IMPORTANT NOTE: You are advised to consult the publisher's version (publisher's PDF) if you wish to cite from it. Please check the document version below. Document Version Publisher's PDF, also known as Version of record Publication date: 2020 Link to publication in University of Groningen/UMCG research database Citation for published version (APA): Gutleben, J., Loureiro, C., Ramírez Romero, L. A., Shetty, S., Wijffels, R. H., Smidt, H., & Sipkema, D. (2020). Cultivation of Bacteria From Aplysina aerophoba: Effects of Oxygen and Nutrient Gradients. Frontiers in Microbiology, 11, [175]. https://doi.org/10.3389/fmicb.2020.00175 Copyright Other than for strictly personal use, it is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license (like Creative Commons). The publication may also be distributed here under the terms of Article 25fa of the Dutch Copyright Act, indicated by the “Taverne” license. More information can be found on the University of Groningen website: https://www.rug.nl/library/open-access/self-archiving-pure/taverne- amendment. Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. Downloaded from the University of Groningen/UMCG research database (Pure): http://www.rug.nl/research/portal. For technical reasons the number of authors shown on this cover page is limited to 10 maximum. Download date: 06-10-2021 fmicb-11-00175 February 17, 2020 Time: 16:56 # 1 ORIGINAL RESEARCH published: 19 February 2020 doi: 10.3389/fmicb.2020.00175 Cultivation of Bacteria From Aplysina aerophoba: Effects of Oxygen and Nutrient Gradients Johanna Gutleben1, Catarina Loureiro1, Laura Adriana Ramírez Romero1, Sudarshan Shetty1, René H. Wijffels2, Hauke Smidt1 and Detmer Sipkema1* 1 Laboratory of Microbiology, Wageningen University & Research, Wageningen, Netherlands, 2 Bioprocess Engineering, AlgaePARC, Wageningen University, Wageningen, Netherlands Sponge-associated bacteria possess biotechnologically interesting properties but as yet have largely evaded cultivation. Thus, “omics”-based information on the ecology and functional potential of sponge symbionts is awaiting its integration into the design of innovative cultivation approaches. To cultivate bacteria derived from the marine sponge Aplysina aerophoba, nine novel media formulations were created based on the predicted genomic potential of the prevalent sponge symbiont lineage Poribacteria. In addition, to maintain potential microbial metabolic interactions in vitro, a Liquid- Edited by: Solid cultivation approach and a Winogradsky-column approach were applied. The vast Marcelino T. Suzuki, Sorbonne Université, France majority of microorganisms in the inoculum appeared viable after cryopreservation of Reviewed by: sponge specimen as determined by selective propidium monoazide DNA modification of Cristiane Cassiolato Pires membrane-compromised cells, however, only 2% of the initial prokaryotic diversity could Hardoim, São Paulo State University, Brazil be recovered through cultivation. In total, 256 OTUs encompassing seven prokaryotic Alexandre Soares Rosado, phyla were cultivated. The diversity of the cultivated community was influenced by Federal University of Rio de Janeiro, the addition of the antibiotic aeroplysinin-1 as well as by medium dilution, rather than Brazil carbon source. Furthermore, the Winogradsky-column approach reproducibly enriched *Correspondence: Detmer Sipkema distinct communities at different column depths, amongst which were numerous [email protected] Clostridia and OTUs that could not be assigned to a known phylum. While some Specialty section: bacterial taxa such as Pseudovibrio and Ruegeria were recovered from nearly all This article was submitted to applied cultivation conditions, others such as Bacteroidetes were specific to certain Aquatic Microbiology, medium types. Predominant sponge-associated prokaryotic taxa remained uncultured, a section of the journal Frontiers in Microbiology nonetheless, alternative cultivation approaches applied here enriched for previously Received: 22 July 2019 uncultivated microbes. Accepted: 24 January 2020 Published: 19 February 2020 Keywords: microbial cultivation, marine sponge, Aplysina aerophoba, viability PCR, antibiotic resistance, environmental microbes Citation: Gutleben J, Loureiro C, Ramírez Romero LA, Shetty S, INTRODUCTION Wijffels RH, Smidt H and Sipkema D (2020) Cultivation of Bacteria From Aplysina aerophoba: Effects Marine sponges represent the oldest, living lineage of the animal kingdom, with a longstanding of Oxygen and Nutrient Gradients. association to microorganisms (Hooper and Van Soest, 2012; McFall-Ngai et al., 2013). To date, Front. Microbiol. 11:175. 41 prokaryotic phyla have been found in association with sponges (Thomas et al., 2016) and doi: 10.3389/fmicb.2020.00175 accordingly, this vast genetic potential is hypothesized to be accountable for numerous interactions Frontiers in Microbiology| www.frontiersin.org 1 February 2020| Volume 11| Article 175 fmicb-11-00175 February 17, 2020 Time: 16:56 # 2 Gutleben et al. Cultivation of Bacteria From Aplysina aerophoba between sponge symbionts and their hosts (Webster and Thomas, A predominant fraction of the A. aerophoba microbiota 2016; Moitinho-Silva et al., 2017; Chaib De Mares et al., 2018). is constituted by members of the bacterial candidate phylum In recent years, omics-based methods (Horn et al., 2016; Slaby Poribacteria. This ubiquitous and widely distributed sponge- et al., 2017) as well as physiological in situ studies have shed associated phylum represents a phylogenetically distant some light on microbial processes in sponges (Bayer et al., member of the Planctomycetes-Verrucomicrobia-Clamydiae 2008; Becerro et al., 2012). Microbes filtered from the seawater superphylum (Fieseler et al., 2006; Wagner and Horn, 2006). comprise the primary food source for most sponges, whilst While poribacteria have remained recalcitrant to cultivation specific microbes evade digestion by the sponge cells and get despite multiple approaches (Pimentel-Elardo et al., 2003; established in the mesohyl where they grow on metabolic waste Hardoim et al., 2014; Lavy et al., 2014), recent cultivation- products or host-derived carbohydrates (Vogel, 2006; Taylor independent multi-omics studies illuminated on the lifestyle of et al., 2007; Simpson, 2011; Kamke et al., 2013; Bayer et al., 2018). this candidate phylum (Fieseler et al., 2004, 2006; Kamke et al., Additionally, carbon fixation by photosynthesis (Burgsdorf 2013, 2014; Jahn et al., 2016) postulating a heterotrophic, aerobic et al., 2015), nitrification (Bayer et al., 2008; Hoffmann et al., metabolism with the genetic potential to degrade a wide range of 2009), sulfur cycling (Keren et al., 2015), phosphorus cycling carbohydrates and glycoproteins. (Zhang et al., 2015), vitamin synthesis by microorganisms, Keeping the above in mind, this study aims to address and prokaryotic production of secondary metabolites for host the discrepancy between the cultivable and total community defense (Kennedy et al., 2007; Hochmuth and Piel, 2009; of A. aerophoba and investigates several issues potentially Freeman et al., 2012; Indraningrat et al., 2016) all occur in contributing to the current uncultivability of sponge-associated the sponge holobiont (Webster and Thomas, 2016). However, bacteria. Firstly, we investigate whether sample processing detailed disentanglement of prokaryotic functionalities is majorly and cryopreservation impacts the viability of sponge-associated hindered by the lack of cultured representatives of sponge- bacteria. Secondly, we explore the use of -omics data in defining associated bacteria and archaea. Despite numerous approaches, nutrients and cultivation conditions for Poribacteria and the none of the predominant sponge associated phylotypes belonging addition of a sponge derived antibiotic (aeroplysinin-1). Lastly, to the Acidobacteria, Chloroflexi, Cyanobacteria, Nitrospirae, we describe the first attempts to enrich a complex microbial Poribacteria or Thaumarchaeota could be cultivated in vitro community maintaining at least some metabolic interactions of (Sipkema et al., 2011; Lavy et al., 2014; Steinert et al., 2014; Keren the sponge microbiome in a stratified cultivation system based et al., 2015; Versluis et al., 2017). One of the reasons might include on the Winogradsky-column approach (Madigan et al., 2014; the inability to recreate sponge-mesohyl conditions adequately, Rundell et al., 2014) and within Liquid-Solid cultures. since sponges and their microbiomes evolved complex networks Subsequently, 16S rRNA gene amplicon sequencing was used of cross-feeding and other interactions (Pande and Kost, 2017). to investigate the diversity and composition of (i) the total By using conventional cultivation approaches, such interaction prokaryotic community of A. aerophoba, (ii) its viable fraction networks are mostly disrupted during the early stages of isolation. after cryopreservation, and (iii) its cultivable fraction. With these Recent advances
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