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2016 ; 533
(7604
): 499-503
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Synchronized mitochondrial and cytosolic translation programs
#MMPMID27225121
Couvillion MT
; Soto IC
; Shipkovenska G
; Churchman LS
Nature
2016[May]; 533
(7604
): 499-503
PMID27225121
show ga
Oxidative phosphorylation (OXPHOS) is a vital process for energy generation, and
is carried out by complexes within the mitochondria. OXPHOS complexes pose a
unique challenge for cells because their subunits are encoded on both the nuclear
and the mitochondrial genomes. Genomic approaches designed to study
nuclear/cytosolic and bacterial gene expression have not been broadly applied to
mitochondria, so the co-regulation of OXPHOS genes remains largely unexplored.
Here we monitor mitochondrial and nuclear gene expression in Saccharomyces
cerevisiae during mitochondrial biogenesis, when OXPHOS complexes are
synthesized. We show that nuclear- and mitochondrial-encoded OXPHOS transcript
levels do not increase concordantly. Instead, mitochondrial and cytosolic
translation are rapidly, dynamically and synchronously regulated. Furthermore,
cytosolic translation processes control mitochondrial translation
unidirectionally. Thus, the nuclear genome coordinates mitochondrial and
cytosolic translation to orchestrate the timely synthesis of OXPHOS complexes,
representing an unappreciated regulatory layer shaping the mitochondrial
proteome. Our whole-cell genomic profiling approach establishes a foundation for
studies of global gene regulation in mitochondria.