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One Bacterial Cell, One Complete Genome One Bacterial Cell, One Complete Genome Tanja Woyke1, Damon Tighe1, Konstantinos Mavromatis1, Alicia Clum1, Alex Copeland1, Wendy Schackwitz1, Alla Lapidus1, Dongying Wu1, John P. McCutcheon2, Bradon R. McDonald2, Nancy A. Moran2, James Bristow1, Jan-Fang Cheng1* 1 Department of Energy Joint Genome Institute, Walnut Creek, California, United States of America, 2 Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, Arizona, United States of America Abstract While the bulk of the finished microbial genomes sequenced to date are derived from cultured bacterial and archaeal representatives, the vast majority of microorganisms elude current culturing attempts, severely limiting the ability to recover complete or even partial genomes from these environmental species. Single cell genomics is a novel culture- independent approach, which enables access to the genetic material of an individual cell. No single cell genome has to our knowledge been closed and finished to date. Here we report the completed genome from an uncultured single cell of Candidatus Sulcia muelleri DMIN. Digital PCR on single symbiont cells isolated from the bacteriome of the green sharpshooter Draeculacephala minerva bacteriome allowed us to assess that this bacteria is polyploid with genome copies ranging from approximately 200–900 per cell, making it a most suitable target for single cell finishing efforts. For single cell shotgun sequencing, an individual Sulcia cell was isolated and whole genome amplified by multiple displacement amplification (MDA). Sanger-based finishing methods allowed us to close the genome. To verify the correctness of our single cell genome and exclude MDA-derived artifacts, we independently shotgun sequenced and assembled the Sulcia genome from pooled bacteriomes using a metagenomic approach, yielding a nearly identical genome. Four variations we detected appear to be genuine biological differences between the two samples. Comparison of the single cell genome with bacteriome metagenomic sequence data detected two single nucleotide polymorphisms (SNPs), indicating extremely low genetic diversity within a Sulcia population. This study demonstrates the power of single cell genomics to generate a complete, high quality, non-composite reference genome within an environmental sample, which can be used for population genetic analyzes. Citation: Woyke T, Tighe D, Mavromatis K, Clum A, Copeland A, et al. (2010) One Bacterial Cell, One Complete Genome. PLoS ONE 5(4): e10314. doi:10.1371/ journal.pone.0010314 Editor: Niyaz Ahmed, University of Hyderabad, India Received March 2, 2010; Accepted March 11, 2010; Published April 23, 2010 Copyright: ß 2010 Woyke et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Funding: This work was performed under the auspices of the US Department of Energy’s Office of Science, Biological and Environmental Research Program, and by the University of California, Lawrence Berkeley National Laboratory under contract No. DE-AC02-05CH11231, Lawrence Livermore National Laboratory under Contract No. DE-AC52-07NA27344, and Los Alamos National Laboratory under contract No. DE-AC02-06NA25396. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript. Competing Interests: The authors have declared that no competing interests exist. * E-mail: [email protected] Introduction assembly for given community members is likely not feasible, or only at the very high cost of deep sequencing. Moreover, Microorganisms on Earth have undergone an estimated 3.8 heterogeneity within complex environmental samples can pose a billion years of evolution and comprise the vast majority of major challenge during sequence assembly. The more recently biological diversity. The characterization of these life forms not developed single cell genomic approach allows the genome only aids our understanding of genetic and physiological diversity, analysis of individual community members, largely independent community ecology and biogeochemistry, but also furthers the of the complexity of the sample environment [4,13]. Single cells development of novel compounds and processes for biotechnology, can be isolated from the environment using optical tweezers, pharmaceuticals and other applications and industries. As only a micromanipulation, FACS, serial dilutions, microfluidic chips or minute fraction of microbial species are estimated to grow using laser capture microdissection. After cell lysis, the microbial current culturing techniques [1], culture-independent methods are genome is amplified using multiple displacement amplification crucial. Metagenomics [1] and, more recently, single cell genomics (MDA) [4,14], enabling random genome shotgun sequencing. [2,3,4] have become the methods of choice to access the genetic Several uncultured single microbial genomes have recently been material of the uncultured microbial majority to enable predictions sequenced using the single cell approach [15,16,17,18]. While the and drive hypothesis about the life-style of these species as based recovery of .0.5 Mb large contigs has been demonstrated for on their coding potential. Metagenomics has provided the first some of these single amplified genomes (SAGs), no single cell glimpse into the life of uncultured microorganisms [5], a genome has to our knowledge been closed and finished to date. breakthrough that not only led to a large array of new gene In this study, we applied single cell genomics to recover the discoveries [6,7,8], but also enabled close-to-complete [9,10] and complete Candidatus Sulcia muelleri DMIN (hereafter simply complete [11,12] genome access of various uncultured microbes. referred to as Sulcia) genome from the green sharpshooter (GSS) In highly diverse environments, however, notable genome Draeculacephala minerva Ball (Insecta: Hemiptera: Cicadellidae). GSS PLoS ONE | www.plosone.org 1 April 2010 | Volume 5 | Issue 4 | e10314 Symbiont Single Cell Genome are a prominent group of sap-feeding leafhoppers that are involved in the spread of the plant pathogen Xylella fastidiosa, which causes a number of serious plant diseases [19,20]. Sharpshooters are inhabited by two obligate bacterial symbionts, the Gammapro- teobacterial Candidatus Baumannia cicadellinicola [21] and Sulcia,a Bacteroidetes [22]. Vertically transmitted via eggs, they are housed in a specialized host organ called a bacteriome. Besides inhabiting leafhoppers, Sulcia has been found in a wide range of additional related insect hosts, such as treehoppers, cicadas, spittlebugs, and planthoppers, representing an ancient symbiont, that was most likely acquired by an ancient shared ancestor of these related insect hosts [21,22]. The genome of Sulcia from the glassy-winged sharpshooter (GWSS) Homalodisca vitripennis and the cicada Diceroprocta semicincta have previously been sequenced using metagenomics [23,24,25]. In both cases, the metagenomic data were dominated by contaminating host reads, and therefore to obtain complete Sulcia genomes the samples needed to be ‘oversequenced’ to a large degree [24,25]. Here, we report the recovery of the complete circular Sulcia genome from a single polyploid bacterial cell derived from the GSS bacteriome. To validate the correctness of the single cell genome, we independently reconstructed the Sulcia genome using metagenomics, yielding a nearly identical genome. The variations we detected are likely of true biological origin. To evaluate the genetic diversity within the Sulcia community, metagenomic sequence data were generated and aligned to the finished single cell derived reference. We were able to locate two single nucleotide polymorphisms (SNPs) within the metagenomic data, indicating that there is very low genetic diversity within the bacteriome Sulcia community within the sample insect population. Figure 1. Sulcia cell isolation and sequence coverage, closure and polishing locations along the Sulcia DMIN single cell Results and Discussion genome. (A) Micromanipulation of the single Sulcia cell from the sharpshooter bacteriome metasample. (B) Sequence coverage including Polyploidy in Sulcia closure and polishing locations along the finished, circular Sulcia DMIN To assess whether complete sequencing from a single uncul- genome with circles corresponding to following features, starting with tured bacterial cell is feasible, we aimed to sequence a polyploid outermost circle: (1) Illumina sequence coverage ranging from 0–3276 (mean 303+2386), (2) pyrosequence sequence coverage ranging from genome. The presence of multiple genome copies could enable 0–231 (mean 42+239), (3) Sanger sequence coverage ranging from 0– finishing a single cell genome, even if double-stranded DNA 30 (mean 10+27), (4) locations of captured (green) and uncaptured breaks were introduced during the single cell lysis step and gaps (orange), (5) polishing locations corrected using Illumina (blue) handling for whole genome amplification. While polyploidy has and Sanger (purple) seqeunce, (6) GC content heat map (dark blue to been reported in the intracellular aphid symbiont Buchnera [26,27], light green = low to high values) and (7) GC skew. it was only suspected for Sulcia, based on the intensity of DNA doi:10.1371/journal.pone.0010314.g001 staining in the very large Sulcia cells. In pea aphid hosts, Buchnera
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