Abstract: The present disclosure provides compositions and methods for the targeted modification of RNA molecules by RNA prime editing. The compositions and methods may be conducted invitro or in vivo within cells (e.g., human cells) for the therapeutic correction of disease-causing mutations and/or installation of motifs or mutations in RNA molecules of interest as a tool for scientific research. The disclosure provides compositions and methods for conducting RNA prime editing of a target RNA molecule (e.g., an RNA transcript) that enables the incorporation of one or more nucleotide changes and/or targeted mutagenesis of a target RNA molecule. The nucleotide change can include a single-nucleotide change, an insertion of one or more nucleotides, or a deletion of one or more nucleotides.

Abstract: The disclosure provides modified pegRNAs comprising one or more appended nucleotide structural motifs which increase the editing efficiency during prime editing, increase half-life in vivo, and increase lifespan in a cell. Modifications include, but are not limited to, an aptamer (e.g., prequeosim-1 riboswitch aptamer or “evopreQi-1”) or a variant thereof, a pseudoknot (the MMLV viral genome pseudoknot or “Mpknot-1”) or a variant thereof, a tRNA (e.g., the modified tRNA used by MMLV as a primer for reverse transcription) or a variant thereof, or a G-quadruplex or a variant thereof. The disclosure further provides prime editor complexes comprising the modified pegRNAs and having improved characteristics and/or performance, including stability, improved cellular lifespan, and improved editing efficiency.

Abstract: The disclosure provides programmable methylation “writers” and demethylation “erasers” for editing the methylation state of RNA targets, e.g., an RNA transcriptome. In particular, the disclosure provides RNA methylation editor polynucleotide contracts and vectors comprising (i) an RNA programmable RNA binding domain (RNApRNAbd); and (ii) an effector domain, wherein the effector domain is capable of adding or removing a methyl group in an RNA. The disclosed RNA methylation editor constructs are capable of achieving limited off-target modifications in RNA molecules. Further, the disclosure provides methods for making and using the programmable methylation editors to modifying the methylation state of RNA. The disclosure further provides complexes comprising a methylation writer protein and a guide RNA molecule and complexes comprising a demethylation eraser protein and a guide RNA molecule.

Abstract: A method of electrically inducing mechanical precompression of a ferroelectric plate covered with electrodes utilizes the change in strains of the plate as functions of applied electric field. A first field polarizes and laterally shrinks the entire plate. An outer portion of the electrodes are removed, and an opposite field partially depolarizes and expands the central portion of the plate against the shrunk outer portion.

Abstract: Mechanical waves are generated in a medium by subjecting an electromechanical element to an alternating electric field having a frequency which induces mechanical resonance therein and is below any electrical resonance frequency thereof.