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Discrimintion and Mapping of the Primary and Processed Transcripts in Maize Mitochondrion Using a Circular RT-PCR-based Strategy
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Localization, sequence and expression of the gene coding for tRNA(Pro) (UGG) in plant mitochondria.

P Runeberg-Roos1, J M Grienenberger, P Guillemaut

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Summary

Researchers identified a proline transfer RNA (tRNA) gene in wheat mitochondrial DNA, also found in maize and bean mitochondria. This gene is actively transcribed in both wheat and maize mitochondria.

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Area of Science:

  • Mitochondrial genetics
  • Molecular biology
  • Plant genomics

Background:

  • Wheat mitochondrial DNA contains ribosomal RNA genes.
  • Transfer RNA (tRNA) genes are essential for protein synthesis.
  • Investigating mitochondrial genomes reveals functional genetic elements.

Purpose of the Study:

  • To identify tRNA genes within wheat mitochondrial DNA fragments containing ribosomal RNA genes.
  • To determine the presence and transcription of a specific tRNA(Pro) (UGG) gene in related plant species.
  • To map the localization of this tRNA gene in the maize mitochondrial genome.

Main Methods:

  • Sal I digestion of wheat mitochondrial DNA.
  • DNA sequencing of specific fragments.
  • Gene localization studies in maize.
  • In vitro transcription and post-labeling techniques.

Main Results:

  • A tRNA(Pro) (UGG) gene was identified in two of four Sal I fragments of wheat mitochondrial DNA.
  • The corresponding gene was localized on the maize mitochondrial genome.
  • This tRNA(Pro) (UGG) gene is transcribed in both wheat and maize mitochondria.
  • The sequence of the bean mitochondrial tRNA(Pro) (UGG) was determined.

Conclusions:

  • Wheat mitochondrial DNA harbors a functional tRNA(Pro) (UGG) gene.
  • This gene is conserved and transcribed across different plant mitochondrial genomes (wheat, maize, bean).
  • The findings contribute to understanding mitochondrial gene organization and expression in plants.