Disclosed herein include methods, compositions, and kits suitable for use in the measurement of the states of living cells across time and for use in the delivery of polyribonucleotides and circuits. There are provided, in some embodiments,
RNA exporter proteins comprising an
RNA-
binding domain, a membrane-
binding domain, and an interaction domain capable of nucleating self-
assembly. Disclosed herein include polynucleotides encoding reporter
RNA molecule(s) or cargo
RNA molecule(s). In some embodiments, a plurality of RNA exporter proteins are capable of self-assembling into lipid-enveloped nanoparticles (LNs) secreted from a
cell in which the RNA exporter proteins are expressed, thereby generating a
population of LNs comprising exported reporter
RNA molecule(s) or a fusogen and exported cargo
RNA molecule(s). Disclosed herein include export modulator proteins capable of, e.g., enhancing or suppressing LN export.