A unique system for regulating mitochondrial mRNA poly(A) statusand stability in plants

摘要

Poy(A) status is the major determi-nant of mRNA stability, even inendosymbiotic organelles. Poly(A) spe-cific ribonuclease (PARN) is distributedwidely among eukaryotes and has beenshown to regulate the poly(A) status ofcytoplasmic mRNA in various organisms.Surprisingly, our recent study revealedthat PARN also directly regulates poly(A) status of mitochondrial mRNA inArabidopsis. In this addendum, we dis-cuss whether this mitochondrial functionof PARN is common in plants and whyPARN has been assignedsuch a uniquefunction.