Nuclear Genes That Encode Mitochondrial Proteins for DNA and RNA Metabolism Are Clustered in the Arabidopsis GenomeW⃞
AUTOR(ES)
Elo, Annakaisa
FONTE
American Society of Plant Biologists
RESUMO
The plant mitochondrial genome is complex in structure, owing to a high degree of recombination activity that subdivides the genome and increases genetic variation. The replication activity of various portions of the mitochondrial genome appears to be nonuniform, providing the plant with an ability to modulate its mitochondrial genotype during development. These and other interesting features of the plant mitochondrial genome suggest that adaptive changes have occurred in DNA maintenance and transmission that will provide insight into unique aspects of plant mitochondrial biology and mitochondrial-chloroplast coevolution. A search in the Arabidopsis genome for genes involved in the regulation of mitochondrial DNA metabolism revealed a region of chromosome III that is unusually rich in genes for mitochondrial DNA and RNA maintenance. An apparently similar genetic linkage was observed in the rice genome. Several of the genes identified within the chromosome III interval appear to target the plastid or to be targeted dually to the mitochondria and the plastid, suggesting that the process of endosymbiosis likely is accompanied by an intimate coevolution of these two organelles for their genome maintenance functions.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=165405Documentos Relacionados
- Coordination of Nuclear and Mitochondrial Genome Expression during Mitochondrial Biogenesis in ArabidopsisW⃞
- Developmental expression of nuclear genes that encode mitochondrial proteins: insect cytochromes c.
- An analysis of cosmid clones of nuclear DNA from Trypanosoma brucei shows that the genes for variant surface glycoproteins are clustered in the genome.
- Large Intraspecific Haplotype Variability at the Rph7 Locus Results from Rapid and Recent Divergence in the Barley GenomeW⃞
- Silk gland-specific tRNA(Ala) genes are tightly clustered in the silkworm genome.