Abstract:
:Golgi reassembly and stacking protein (GRASP) is required for polysaccharide secretion and virulence in Cryptococcus neoformans. In fungal species, extracellular vesicles (EVs) participate in the export of polysaccharides, proteins and RNA. In the present work, we investigated if EV-mediated RNA export is functionally connected with GRASP in C. neoformans using a graspΔ mutant. Since GRASP-mediated unconventional secretion involves autophagosome formation in yeast, we included the atg7Δ mutant with defective autophagic mechanisms in our analysis. All fungal strains exported EVs but deletion of GRASP or ATG7 profoundly affected vesicular dimensions. The mRNA content of the graspΔ EVs differed substantially from that of the other two strains. The transcripts associated to the endoplasmic reticulum were highly abundant transcripts in graspΔ EVs. Among non-coding RNAs (ncRNAs), tRNA fragments were the most abundant in both mutant EVs but graspΔ EVs alone concentrated 22 exclusive sequences. In general, our results showed that the EV RNA content from atg7Δ and WT were more related than the RNA content of graspΔ, suggesting that GRASP, but not the autophagy regulator Atg7, is involved in the EV export of RNA. This is a previously unknown function for a key regulator of unconventional secretion in eukaryotic cells.
journal_name
Genes (Basel)journal_title
Genesauthors
Peres da Silva R,Martins ST,Rizzo J,Dos Reis FCG,Joffe LS,Vainstein M,Kmetzsch L,Oliveira DL,Puccia R,Goldenberg S,Rodrigues ML,Alves LRdoi
10.3390/genes9080400subject
Has Abstractpub_date
2018-08-08 00:00:00issue
8issn
2073-4425pii
genes9080400journal_volume
9pub_type
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