Fuente: WIPO "tomato" The present invention pertains to: a guide RNA having, on the 5' side of a spacer sequence, a repeat sequence that is cleaved through processing for forming a cascade complex, and not having a repeat sequence or having a sequence that is not cleaved through processing for forming a cascade complex, on the 3' side of the spacer sequence; and a type-I CRISPR-Cas system using the guide RNA.