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LRPPRC is necessary for polyadenylation and coordination of translation of mitochondrial mRNAs
Author(s) -
Ruzzenente Benedetta,
Metodiev Metodi D,
Wredenberg Anna,
Bratic Ana,
Park Chan Bae,
Cámara Yolanda,
Milenkovic Dusanka,
Zickermann Volker,
Wibom Rolf,
Hultenby Kjell,
ErdjumentBromage Hediye,
Tempst Paul,
Brandt Ulrich,
Stewart James B,
Gustafsson Claes M,
Larsson NilsGöran
Publication year - 2012
Publication title -
the embo journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 7.484
H-Index - 392
eISSN - 1460-2075
pISSN - 0261-4189
DOI - 10.1038/emboj.2011.392
Subject(s) - biology , polyadenylation , translation (biology) , genetics , mitochondrial dna , messenger rna , computational biology , microbiology and biotechnology , gene
Regulation of mtDNA expression is critical for maintaining cellular energy homeostasis and may, in principle, occur at many different levels. The leucine‐rich pentatricopeptide repeat containing (LRPPRC) protein regulates mitochondrial mRNA stability and an amino‐acid substitution of this protein causes the French‐Canadian type of Leigh syndrome (LSFC), a neurodegenerative disorder characterized by complex IV deficiency. We have generated conditional Lrpprc knockout mice and show here that the gene is essential for embryonic development. Tissue‐specific disruption of Lrpprc in heart causes mitochondrial cardiomyopathy with drastic reduction in steady‐state levels of most mitochondrial mRNAs. LRPPRC forms an RNA‐dependent protein complex that is necessary for maintaining a pool of non‐translated mRNAs in mammalian mitochondria. Loss of LRPPRC does not only decrease mRNA stability, but also leads to loss of mRNA polyadenylation and the appearance of aberrant mitochondrial translation. The translation pattern without the presence of LRPPRC is misregulated with excessive translation of some transcripts and no translation of others. Our findings point to the existence of an elaborate machinery that regulates mammalian mtDNA expression at the post‐transcriptional level.