The discovery of RNA interference has revitalized the long ongoing pursuit of gene therapy for the treatment of diseases. Nevertheless, despite promising results from experimental studies, there remains a pressing need for the development of nanocarriers that are clinically-relevant, biocompatible, efficient, and that can be tailored to specific disease targets. This review surveys the broad spectrum of nanomaterials and their functional add-ons, and aims to provide a guide towards engineering nanocarriers for effective siRNA delivery.
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