Abstract: Disclosed are compositions for transfecting a nucleic acid molecule into a cell and their applications. Specifically, this relates to a composition suitable for transfecting a nucleic acid molecule into a cell, preferably a eukaryotic cell, including (i) at least one compound of general formula (II) or a tautomer, mesomer, racemate, enantiomer, diastereomer, or mixture thereof, or an acceptable salt thereof, and (ii) an acceptable excipient, buffering agent, cell culture medium, or transfection medium, wherein Y1, Y2, Y3, Z1, Z2, Z3, Z4, Z5, Z6, Z7, X1, X2, R3, P+, R, T, U and V are as defined in the description. Also disclosed are uses of the composition and to a method for in vitro or ex vivo transfection of live cells.

Abstract: Disclosed are compositions for transfecting a nucleic acid molecule into a cell and their applications. Specifically, this relates to a composition suitable for transfecting a nucleic acid molecule into a cell, preferably a eukaryotic cell, including (i) at least one compound of general formula (I), preferably of general formula (III), or a tautomer, mesomer, racemate, enantiomer, diastereomer, or mixture thereof, or an acceptable salt thereof, and (ii) an acceptable excipient, buffering agent, cell culture medium, or transfection medium, wherein Y1, Y2, Y3, Z1, Z2, Z3, X1, X2, R3, P+, R and V are as defined in the description. Also disclosed are uses of the composition and to a method for in vitro or ex vivo transfection of live cells.

Abstract: Disclosed are compositions for transfecting a messenger RNA (mRNA) into a cell and their applications. The present invention is directed to a composition for transfecting a mRNA into a cell including a mRNA, at least one neutral lipid and a cationic lipid of formula (I), wherein R1 R2, R3, R4 and R5, (CH2)n and A? are as defined in the description. Also disclosed are uses of the composition and to a method for in vitro transfection of live cells.

Abstract: The invention relates to a composition useful as transfection agent, comprising polyamines modified by aromatic amino acids and small double-strand or single-strand RNA active for RNA interference.

Abstract: The invention concerns a method of synthesising and preparing linear polyethylenimine (PEI) for use as a transfection vector, and the product obtained with such a method. It comprises drying a monomer 2-ethyl-2-oxazoline and polymerising said monomer for obtaining poly (2-ethyl-2-oxazoline) (PEOX) by: using acetonitrile as solvent, adding a dried initiator of the reaction of polymerisation, and mixing them altogether, purifying said obtained PEOX by evaporation, while performing at least three times successive washing/precipitation steps with methanol and diethyl ether and corresponding filtrations, in order to obtain (i), by performing 1H-NMR tests, correct identification of said PEOX polymer, confirmation of absence of monomer to a level <1.0% and confirmation of absence of solvent to a level <5.0% and (ii), by performing Gel Permeation Chromatography, a mean of molecular weight (Mw)>23,000 Da and polydispersity (Mw/Mn) of said PEOX<1.5, hydrolysing said PEOX.