Naslov
Normal mitochondrial function in Saccharomyces cerevisiae has become dependent on inefficient splicing

Autori
Rudan, Marina ; Bou Dib, Peter ; Musa, Marina ; Kanunnikau, Matea ; Sobočanec, Sandra ; Rueda, David ; Warnecke, Tobias ; Kriško, Anita

Izvornik
ELife (2050-084X) 7 (2018); E35330, 17

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, ostalo

Ključne riječi
Saccharomyces cerevisiae ; mitochondria ; lifespan ; splicing, genome

Sažetak
Self-splicing introns are mobile elements that have invaded a number of highly conserved genes in prokaryotic and organellar genomes. Here, we show that deletion of these selfish elements from the Saccharomyces cerevisiae mitochondrial genome is stressful to the host. A strain without mitochondrial introns displays hallmarks of the retrograde response, with altered mitochondrial morphology, gene expression and metabolism impacting growth and lifespan. Deletion of the complete suite of mitochondrial introns is phenocopied by overexpression of the splicing factor Mss116. We show that, in both cases, abnormally efficient transcript maturation results in excess levels of mature cob and cox1 host mRNA. Thus, inefficient splicing has become an integral part of normal mitochondrial gene expression. We propose that the persistence of S. cerevisiae self-splicing introns has been facilitated by an evolutionary lock-in event, where the host genome adapted to primordial invasion in a way that incidentally rendered subsequent intron loss deleterious.

Izvorni jezik
Engleski

Znanstvena područja
Biologija, Temeljne medicinske znanosti

POVEZANOST RADA