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Marchantia polymorpha mitochondrial orf identifies transcribed sequence in angiosperm mitochondrial genome
S F Siqueira1, S M Dias, B Lejeune
1Centro de Biologia Molecular e Engenharia Genética, Universidade Estadual de Campinas, Cidade Universitária Zererino Vaz, Campinas, SP, Brazil.
Biochimica Et Biophysica Acta
|September 22, 2001
Summary
Three Marchantia polymorpha mitochondrial open reading frames (orfs) and the sdh4 gene are conserved in angiosperm mitochondrial DNA. Potato mitochondrial genes show transcription, but only sdh4 exhibits protein homology.
Area of Science:
- Plant Molecular Biology
- Mitochondrial Genomics
- Comparative Genomics
Background:
- The mitochondrial genome of plants contains essential genes for cellular respiration.
- Understanding gene conservation across species aids in evolutionary studies and functional analysis.
- Marchantia polymorpha serves as a model organism for plant biology research.
Purpose of the Study:
- To investigate the conservation of Marchantia polymorpha mitochondrial open reading frames (orfs) and the sdh4 gene in angiosperm mitochondrial genomes.
- To identify and characterize homologous genes in Solanum tuberosum (potato) mitochondrial DNA.
- To evaluate the expression and functional homology of these genes in potato.
Main Methods:
- Heterologous hybridization using M. polymorpha mitochondrial orfs and the sdh4 gene against angiosperm mtDNA.
- Cloning and sequencing of Solanum tuberosum mtDNA fragments that hybridized to M. polymorpha orf207 and sdh4.
- Gene expression analysis using Northern blotting and reverse transcription-polymerase chain reaction (RT-PCR).
Main Results:
- Three M. polymorpha orfs and the sdh4 gene were found to be conserved in various angiosperm mitochondrial genomes.
- Potato mtDNA fragments hybridized to M. polymorpha orf207 and sdh4 were transcribed.
- Homology was observed between the protein encoded by M. polymorpha sdh4 and the potato mitochondrial genome, but not between M. polymorpha orf207 and the potato orf78.
Conclusions:
- The sdh4 gene and three other mitochondrial orfs from M. polymorpha show evolutionary conservation across angiosperms.
- While potato mitochondrial orf207 and orf78 are transcribed, they do not represent homologous sequences, suggesting distinct evolutionary origins or functions.