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De novo Assembly of a 40 Mb Eukaryotic Genome from Short Sequence Reads: Sordaria macrospora, a Model Organism for Fungal Morphogenesis

Journal Article · · PLoS Genetics
 [1];  [2];  [3];  [4];  [5];  [6];  [4];  [7];  [8];  [3];  [8];  [9];  [3];  [10];  [11];  [5];  [4];  [11]
  1. Ruhr Univ., Bochum (Germany). Lehrstuhl fur Allgemeine und Molekulare Botanik; DOE/OSTI
  2. Univ. of California, Riverside, CA (United States). Dept. of Plant Pathology and Microbiology
  3. Univ. of Edinburgh, Scotland (United Kingdom). Inst. of Cell Biology. Fungal Cell Biology Group
  4. Ruhr Univ., Bochum (Germany). Lehrstuhl fur Allgemeine und Molekulare Botanik
  5. Univ. Paris-Sud, Orsay (France). Inst. de Genetique et Microbiologie
  6. Univ. of Edinburgh, Scotland (United Kingdom). Biological Sciences. Inst. of Molecular Plant Sciences
  7. Christian-Albrechts-Universitat zu Kiel (Germany). Botanisches Institut und Botanischer Garten. Abteilung Botanische Genetik und Molekularbiologie
  8. Johann Wolfgang Goethe Univ., Frankfurt (Germany). Faculty for Biosciences and Cluster of Excellence Macromolecular Complexes. Inst. of Molecular Biosciences
  9. Georg-August Univ., Gottingen (Germany). Dept. of Genetics of Eukaryotic Microorganisms. Inst. of Microbiology and Genetics
  10. Georg-August Univ., Gottingen (Germany). DFG Research Center Molecular Physiology of the Brain (CMPB). Dept. of Molecular Microbiology and Genetics. Inst. of Microbiology and Genetics
  11. Oregon State Univ., Corvallis, OR (United States). Dept. of Biochemistry and Biophysics. Center for Genome Research and Biocomputing

Filamentous fungi are of great importance in ecology, agriculture, medicine, and biotechnology. Thus, it is not surprising that genomes for more than 100 filamentous fungi have been sequenced, most of them by Sanger sequencing. While nextgeneration sequencing techniques have revolutionized genome resequencing, e.g. for strain comparisons, genetic mapping, or transcriptome and ChIP analyses, de novo assembly of eukaryotic genomes still presents significant hurdles, because of their large size and stretches of repetitive sequences. Filamentous fungi contain few repetitive regions in their 30–90 Mb genomes and thus are suitable candidates to test de novo genome assembly from short sequence reads. Here, we present a high-quality draft sequence of the Sordaria macrospora genome that was obtained by a combination of Illumina/ Solexa and Roche/454 sequencing. Paired-end Solexa sequencing of genomic DNA to 85-fold coverage and an additional 10-fold coverage by single-end 454 sequencing resulted in ~4 Gb of DNA sequence. Reads were assembled to a 40 Mb draft version (N50 of 117 kb) with the Velvet assembler. Comparative analysis with Neurospora genomes increased the N50 to 498 kb. The S. macrospora genome contains even fewer repeat regions than its closest sequenced relative, Neurospora crassa. Comparison with genomes of other fungi showed that S. macrospora, a model organism for morphogenesis and meiosis, harbors duplications of several genes involved in self/nonself-recognition. Furthermore, S. macrospora contains more polyketide biosynthesis genes than N. crassa. Phylogenetic analyses suggest that some of these genes may have been acquired by horizontal gene transfer from a distantly related ascomycete group. Our study shows that, for typical filamentous fungi, de novo assembly of genomes from short sequence reads alone is feasible, that a mixture of Solexa and 454 sequencing substantially improves the assembly, and that the resulting data can be used for comparative studies to address basic questions of fungal biology.

Research Organization:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER). Biological Systems Science Division; German Research Foundation (DFG); American Cancer Society; Biotechnological and Biological Sciences Research Council (BBSRC)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1627282
Journal Information:
PLoS Genetics, Journal Name: PLoS Genetics Journal Issue: 4 Vol. 6; ISSN 1553-7404
Publisher:
Public Library of ScienceCopyright Statement
Country of Publication:
United States
Language:
English

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Metatranscriptome analysis of fungal strains Penicillium camemberti and Geotrichum candidum reveal cheese matrix breakdown and potential development of sensory properties of ripened Camembert-type cheese journal January 2014
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Repeat-induced point mutation in Neurospora crassa causes the highest known mutation rate and mutational burden of any cellular life journal June 2020
Genome Sequencing and Comparative Transcriptomics of the Model Entomopathogenic Fungi Metarhizium anisopliae and M. acridum journal January 2011
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The Genome and Development-Dependent Transcriptomes of Pyronema confluens: A Window into Fungal Evolution journal September 2013
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