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Updated: May 4, 2026

Optimization and Comparative Analysis of Plant Organellar DNA Enrichment Methods Suitable for Next-generation Sequencing
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Optimization and Comparative Analysis of Plant Organellar DNA Enrichment Methods Suitable for Next-generation Sequencing

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Comparative analyses of two Geraniaceae transcriptomes using next-generation sequencing.

Jin Zhang, Tracey A Ruhlman, Jeffrey P Mower

  • 1Department of Integrative Biology and Institute of Cellular and Molecular Biology, The University of Texas at Austin, 205 W, 24th St, Stop C0930, Austin, TX 78712, USA. jansen@austin.utexas.edu.

BMC Plant Biology
|December 31, 2013
PubMed
Summary
This summary is machine-generated.

Organelle genomes in Geraniaceae show unusual evolution. Sequencing nuclear transcriptomes revealed insights into nuclear-organelle genome co-evolution in Geranium and Pelargonium species.

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Area of Science:

  • Plant genomics
  • Evolutionary biology
  • Comparative genomics

Background:

  • Geraniaceae organelle genomes display unique evolutionary traits like rapid substitution rates and gene loss.
  • Nuclear-encoded proteins interact with organelle proteins, suggesting nuclear genome evolution is influenced by organellar changes.
  • Understanding nuclear-organelle genome co-evolution is crucial for this plant family.

Purpose of the Study:

  • To investigate the co-evolutionary relationship between nuclear and organelle genomes in Geraniaceae.
  • To sequence and analyze nuclear transcriptomes of Geranium maderense and Pelargonium x hortorum.
  • To identify optimal methods for de novo transcriptome sequencing and assembly in these species.

Main Methods:

  • Nuclear transcriptomes were sequenced using Illumina and 454 technologies.
  • Five assemblers (MIRA, Newbler, SOAPdenovo, SOAPtrans, Trinity) were evaluated for transcriptome assembly.
  • De novo assembly optimization involved analyzing sequencing depth and tissue sampling strategies.

Main Results:

  • Trinity assembler with Illumina data yielded the highest quality transcriptome assembly.
  • Transcriptome analysis revealed fewer PPR protein transcripts, correlating with reduced RNA editing in Geraniaceae.
  • Functional plastid-targeted sigma factors were identified, suggesting a functional organellar gene.

Conclusions:

  • Illumina platform and assemblers like Trinity or SOAPtrans are recommended for high-quality de novo transcriptome assembly.
  • Extensive sequencing or multi-tissue sampling did not significantly improve transcriptome breadth.
  • Cross-compartmental genomic analysis is powerful for studying plant genome co-evolution.