Fuente: WIPO "tomato" A composition for increasing the efficiency of genome editing with a single-strand-form editing polynucleotide capable of modifying a target site in a double-stranded genome DNA. The composition includes at least one protein selected from Hfq, DnaK, and variants thereof, or a nucleic acid having a base sequence that encodes the protein. A genome editing kit including the composition and an editing polynucleotide. A method for modifying a target site in a double-stranded genome DNA of a cell or a living organism including treating a cell or living organism with the genome editing kit. A method for producing a cell or living organism in which a target site in a double-stranded genome DNA has been modified.