The invention discloses a method for breeding rmnd5b (required for meiotic nuclear division 5homolog B)
gene deletion type zebra fish through
gene knockout and belongs to the field of
gene knockout. According to the method, construction of a gRNA
expression vector and gRNA in-vitro synthesis are performed through design of a
CRISPR / Cas9 (clustered regularly interspaced short palindromic repeats /
CRISPR-associated 9)
gene knockout target site, micro-injection is performed on an
embryo of the zebra fish, the effectiveness of the
target site is detected,
tail cutting identification is performed,
TA cloning is performed on a target sequence, plasmids are subjected to
Sanger sequencing, an F1 generation of heritable zebra fish mutants is obtained, the same
mutant female fish and male fish are picked from mutants of the F1 generation, hybridization is performed, an F2 generation of the zebra fish mutants is obtained, F2 generation homozygote is picked from the F2 generation of the zebra fishmutants, F3 generation pure-line inheritance is performed, and an rmnd5b
gene deletion type zebra fish strain is obtained. The method is lower in off-target rate and has good
medical research value inresearch of the correlation between rmnd5b
gene deletion and development of other organs.