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Isolation, Characterization, and Total DNA Extraction to Identify Endophytic Fungi in Mycoheterotrophic Plants

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Single-Molecule Real-Time Sequencing Combined with Optical Mapping Yields Completely Finished Fungal Genome.

Luigi Faino¹, Michael F Seidl¹, Erwin Datema²

¹Laboratory of Phytopathology, Wageningen University, Wageningen, The Netherlands.

|August 20, 2015

Summary

Achieving complete eukaryotic genome assemblies is now possible using PacBio long reads and optical mapping. This advanced sequencing approach overcomes fragmentation issues, enabling detailed study of complex genomes like Verticillium dahliae.

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Area of Science:

Genomics
Fungal Biology
Bioinformatics

Background:

Next-generation sequencing (NGS) has advanced genomic studies but often results in fragmented eukaryotic genome assemblies.
Essential biological information may be lost in unassembled genomic regions.
The filamentous fungus Verticillium dahliae serves as a model for assessing genome assembly strategies.

Purpose of the Study:

To evaluate various sequencing and assembly strategies for producing contiguous and complete eukaryotic genome assemblies.
To investigate methods for achieving gapless telomere-to-telomere genome assemblies.
To enable in-depth genomic analyses for functional studies in fungal biology.

Main Methods:

Comparative analysis of Illumina-based, hybrid (Illumina and PacBio), and PacBio-only long-read sequencing strategies.
Integration of optical mapping data with long-read sequencing.
Genome assembly and analysis of the filamentous fungus Verticillium dahliae.

Main Results:

Hybrid assemblies using PacBio long reads showed improved contiguity over Illumina-only assemblies.
PacBio-only assemblies, with sufficient depth, outperformed hybrid assemblies and achieved fully assembled chromosomes.
The combination of PacBio long reads and optical mapping produced a gapless, telomere-to-telomere assembly of the eight V. dahliae chromosomes.

Conclusions:

PacBio long reads and optical mapping are effective for generating complete and gapless fungal genome assemblies.
This approach allows for the analysis of previously inaccessible genomic regions, including repetitive elements.
Complete genome assemblies facilitate a comprehensive understanding of an organism's biology and evolution.