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Genome Sequences

High-Quality Draft Genome Sequence of the Causal Agent of the Current Panama Disease Epidemic

Rachel J. Warmington, William Kay, Aaron Jeffries, Paul O’Neill, Audrey Farbos, Karen Moore, Daniel P. Bebber, David J. Studholme
Antonis Rokas, Editor
Rachel J. Warmington
Eden Project, Bodelva, United Kingdom
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William Kay
Department of Biosciences, University of Exeter, Exeter, United Kingdom
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Aaron Jeffries
Department of Biosciences, University of Exeter, Exeter, United Kingdom
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Paul O’Neill
Department of Biosciences, University of Exeter, Exeter, United Kingdom
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Audrey Farbos
Department of Biosciences, University of Exeter, Exeter, United Kingdom
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Karen Moore
Department of Biosciences, University of Exeter, Exeter, United Kingdom
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Daniel P. Bebber
Department of Biosciences, University of Exeter, Exeter, United Kingdom
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David J. Studholme
Department of Biosciences, University of Exeter, Exeter, United Kingdom
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Antonis Rokas
Vanderbilt University
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DOI: 10.1128/MRA.00904-19
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ABSTRACT

We present a high-quality draft genome assembly for Fusarium oxysporum f. sp. cubense tropical race 4 (Fusarium odoratissimum), assembled from PacBio reads and consisting of 15 contigs with a total assembly size of 48.59 Mb. This strain appears to belong to vegetative compatibility group complex 01213/16.

ANNOUNCEMENT

Ascomycete fungus Fusarium oxysporum f. sp. cubense is the causal agent of Fusarium wilt (Panama disease), which decimated banana plantations in the 1950s (1–3). The tropical race 4 (TR4) variant of F. oxysporum f. sp. cubense, also known as Fusarium odoratissimum (4), is responsible for a current epidemic spreading through Asia, Africa, and Latin America (4–9). Here, we present a high-quality draft sequence of F. oxysporum TR4; previously available TR4 genome assemblies were assembled from short reads (10) and were highly fragmented. The data from a recently reported PacBio-based TR4 assembly are not publicly available (11).

We isolated F. oxysporum f. sp. cubense TR4 strain UK0001 from a symptomatic banana plant (Musa sp.) at the Eden Project (Cornwall, UK). Genomic DNA was extracted from microconidia (that is, asexual spores) cultured in potato dextrose broth, shaken at 140 rpm, and stored at 25°C for 5 days. Lysis buffer (500 μl; 1% SDS, 100 mM Tris, 10 mM EDTA) was added to a pellet of filtered and washed spores before it was placed on a Vibrax for 30 mins at 2,500 rpm. Five hundred microliters of 25:24:1 phenol-chloroform-isoamyl alcohol was added to tubes before vortexing for 60 s and centrifuging for 10 min at 16,000 × g. The resulting supernatant was mixed with 28 μl cold 7.5 M ammonium acetate and 204 μl cold isopropanol and incubated at −20°C overnight. The following day, the pellets were washed twice in 70% ethanol and twice in 96% ethanol before tubes were inverted and air dried for 60 min at room temperature. Pellets were resuspended in 40 μl MilliQ water and treated with RNase If (Biolabs, UK).

The genome was sequenced using one PacBio single-molecule real-time (SMRT) cell with v3.0 chemistry. Libraries were prepared with the SMRTbell Express template preparation kit and size selected with a 15-kb cutoff using BluePippin (Sage Science, MA, USA). Additionally, we used the Illumina MiSeq system to sequence paired-end libraries prepared with the NEXTFLEX 8-barcode kit (Perkin Elmer), generating 2,889,905 pairs of 300-bp reads.

A total of 723,327 filtered PacBio subreads (N50 length, 19,851 bp) were assembled using the Hierarchical Genome Assembly Process (HGAP) v4 in SMRT Link v7.0.0.63985 (12). Illumina sequence reads were not used in the assembly. The assembly yielded 15 contigs with a total assembly size of 48,588,396 bp (47.54% G+C content, N50 length of 4,494,293 bp). Completeness was estimated using the Sordariomycetes data set in Benchmarking Universal Single-Copy Orthologs (BUSCO) v3.0.2 (13, 14). Of 3,725 target genes, 3,676 (98.6%) occurred as intact and single copies, similar to the 3,673 in a recent PacBio-based assembly of an F. oxysporum f. sp. cubense race 1 genome (15).

We used the MAKER pipeline (16, 17) v2.31.10, including AUGUSTUS (18) v3.1 for ab initio gene prediction with the “Fusarium” species option and homology evidence from a set of 53,031 F. oxysporum f. sp. cubense proteins from the NCBI Proteins database (19) after soft masking by RepeatMasker v4.0.7 against the “Ascomycota” section of RepBase (20–22). This predicted 14,472 protein-coding genes. BLASTN searches against discriminative sequences (23) suggest that UK0001 belongs to vegetative compatibility group complex 01213/16.

Data availability.These data are deposited at DDBJ/ENA/GenBank under the accession number VMNF00000000 and the Sequence Read Archive (24) under BioProject accession number PRJNA556111.

ACKNOWLEDGMENTS

This work was supported by a grant from the Gatsby Charitable Foundation, titled “Banana genetic resources at Eden Project.” Sequencing infrastructure was supported by a Medical Research Council Clinical Infrastructure award (MR/M008924/1), the Wellcome Trust Institutional Strategic Support Fund (WT097835MF), a Wellcome Trust Multi-user Equipment Grant (WT101650MA), and a BBSRC Longer and Larger (LOLA) award (BB/K003240/1).

We acknowledge the University of Exeter Sequencing Service and high-performance computing facilities (Isca) at the University of Exeter.

FOOTNOTES

    • Received 13 August 2019.
    • Accepted 16 August 2019.
    • Published 5 September 2019.
  • Copyright © 2019 Warmington et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 International license.

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High-Quality Draft Genome Sequence of the Causal Agent of the Current Panama Disease Epidemic
Rachel J. Warmington, William Kay, Aaron Jeffries, Paul O’Neill, Audrey Farbos, Karen Moore, Daniel P. Bebber, David J. Studholme
Microbiology Resource Announcements Sep 2019, 8 (36) e00904-19; DOI: 10.1128/MRA.00904-19

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High-Quality Draft Genome Sequence of the Causal Agent of the Current Panama Disease Epidemic
Rachel J. Warmington, William Kay, Aaron Jeffries, Paul O’Neill, Audrey Farbos, Karen Moore, Daniel P. Bebber, David J. Studholme
Microbiology Resource Announcements Sep 2019, 8 (36) e00904-19; DOI: 10.1128/MRA.00904-19
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