表达某种受体蛋白在所有细胞表面,以增加得病时基因治疗的效率
endogenous crispr cas9,受体导入rna,癌突变随意切
Uptake of extracellular double-stranded RNA by SID-2.
McEwan DL1, Weisman AS, Hunter CP.
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Abstract
Ingested dsRNAs trigger RNA interference (RNAi) in many invertebrates,
including the nematode Caenorhabditis elegans. Here we show that the C.
elegans apical intestinal membrane protein SID-2 is required in C. elegans
for the import of ingested dsRNA and that, when expressed in Drosophila S2
cells, SID-2 enables the uptake of dsRNAs. SID-2-dependent dsRNA transport
requires an acidic extracellular environment and is selective for dsRNAs
with at least 50 base pairs. Through structure-function analysis, we
identify several SID-2 regions required for this activity, including three
extracellular, positively charged histidines. Finally, we find that SID-2-
dependent transport is inhibited by drugs that interfere with vesicle
transport. Therefore, we propose that environmental dsRNAs are imported from
the acidic intestinal lumen by SID-2 via endocytosis and are released from
internalized vesicles in a secondary step mediated by the dsRNA channel SID-
1. Similar multistep mechanisms may underlie the widespread observations of
environmental RNAi.