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Related Experiment Videos

Transcript mapping and genome annotation of ascidian mtDNA using EST data.

Carmela Gissi1, Graziano Pesole

  • 1Dipartimento di Scienze Biomolecolari e Biotecnologie, Università di Milano, Milano, Italy.

Genome Research
|August 14, 2003
PubMed
Summary

Researchers reconstructed mitochondrial transcripts from ascidian species using mitochondrial expressed sequence tags (mt-ESTs). This novel approach aids in sequencing and annotating mitochondrial genomes (mtDNAs) and reveals conserved transcript features in Chordata.

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Area of Science:

  • Mitochondrial genomics
  • Molecular evolution
  • Bioinformatics

Background:

  • Mitochondrial genomes (mtDNAs) are crucial for cellular energy production and understanding evolutionary relationships.
  • Sequencing and annotation of mtDNAs can be challenging, especially for previously uncharacterized genomes.
  • Ascidians are important model organisms for studying chordate evolution.

Purpose of the Study:

  • To reconstruct mitochondrial transcripts from two ascidian species (Ciona intestinalis and Halocynthia roretzi) using publicly available mt-ESTs.
  • To analyze mitochondrial transcript processing, mapping, and gene organization.
  • To develop a new strategy for facilitating mtDNA sequencing and annotation.

Main Methods:

  • Sequence assembly of mitochondrial expressed sequence tags (mt-ESTs).

Related Experiment Videos

  • Analysis of transcript processing, mapping, and gene organization.
  • Confirmation of sequences via amplification and sequencing of entire mtDNAs (Ciona intestinalis).

    • Main Results:

    • Successfully reconstructed mitochondrial transcripts and predicted gene organization for Ciona intestinalis mtDNA.
    • Refined gene boundaries and identified a novel Phe-tRNA gene in Halocynthia roretzi.
    • Identified conserved features in mitochondrial transcripts, including polycistronic transcripts, polyadenylation-mediated stop codons, and specific processing/termination signals.

    Conclusions:

    • The mt-EST assembly strategy is effective for mtDNA sequencing and annotation.
    • Mitochondrial transcript processing and gene organization exhibit conserved features across Chordata.
    • This approach significantly facilitates the study of mitochondrial genomes in diverse species.