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DNA transposition between plant organellar genomes.

D B Stern1

  • 1Department of Botany, University of California, Berkeley 94720.

Journal of Cell Science. Supplement
|January 1, 1987
PubMed
Summary

Plant mitochondria and chloroplasts share DNA sequences, with many chloroplast DNA (ctDNA) sequences found in mitochondrial genomes. However, their distribution is sporadic, and some may be transcribed.

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Area of Science:

  • Molecular Biology
  • Plant Genetics
  • Organelle Genomics

Background:

  • Higher plant mitochondrial DNA (mtDNA) and chloroplast DNA (ctDNA) exhibit significant sequence homology.
  • Previous observations suggest DNA exchange or shared ancestry between these organelles.

Purpose of the Study:

  • To investigate the distribution patterns of ctDNA sequences within various mitochondrial genomes.
  • To determine the frequency of DNA transposition between mitochondria and chloroplasts.
  • To ascertain whether transposed ctDNA sequences are transcribed within the mitochondrial environment.

Main Methods:

  • Comparative sequence analysis of mitochondrial and chloroplast genomes from higher plants.
  • Bioinformatic approaches to identify and map ctDNA sequences in mtDNA.
  • Analysis of mitochondrial transcripts for homology with ctDNA sequences, using watermelon as a model.

Main Results:

  • Numerous ctDNA sequences, including functional genes, are widely distributed across different plant mitochondrial genomes and are often highly conserved.
  • The presence of specific ctDNA sequences is sporadic, varying even within the same plant family.
  • Preliminary data suggest that some mitochondrial DNA transcripts may share homology with ctDNA sequences.

Conclusions:

  • Significant inter-organelle sequence sharing occurs between plant mitochondria and chloroplasts.
  • The sporadic distribution implies complex evolutionary dynamics, possibly involving horizontal gene transfer or differential retention.
  • Evidence suggests that some transferred ctDNA sequences might be functional within the mitochondrial context, potentially undergoing transcription.

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