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Genome‐wide analysis of mRNAs targeted to yeast mitochondria
Author(s) -
Marc Philippe,
Margeot Antoine,
Devaux Frédéric,
Blugeon Corinne,
CorralDebrinski Marisol,
Jacq Claude
Publication year - 2002
Publication title -
embo reports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 4.584
H-Index - 184
eISSN - 1469-3178
pISSN - 1469-221X
DOI - 10.1093/embo-reports/kvf025
Subject(s) - polysome , mitochondrion , biology , mitochondrial dna , microbiology and biotechnology , cytoplasm , mitochondrial biogenesis , nuclear gene , rna , gene , genetics , ribosome
It is agreed that nuclear‐encoded mitochondrial proteins are post‐translationally targeted to mitochondria, even if, in some cases, a co‐translational phase can assist the import of precursor proteins. We used yeast DNA microarrays to analyse the mRNA populations associated with free and mitochondrion‐bound polysomes. As expected, many mRNAs, known to encode mitochondrial proteins, are localized to free cytoplasmic polysomes, but many are localized to mitochondrion‐bound polysomes. Furthermore, the 3′‐UTR of six randomly chosen mitochondrion‐bound mRNAs contains sufficient information to target, in vivo , non‐translatable RNA to the vicinity of mitochondria. Interestingly, genes producing mRNAs that are targeted to mitochondria are mainly of ancient bacterial origin, whereas those producing mRNAs that are translated in the cytoplasm are mainly of eukaryotic origin. These observations, which support the recent hypotheses concerning the dual origin of the mitochondrial proteome, provide new insights into the biogenesis of mitochondria.