of the zebrafish trip11 gene was targeted. This site is 33 bp
downstream of the ATG start codon of trip11. gRNA sequences
were cloned in the BsaI site of the DR274 plasmid and in vitrotranscribed with T7 RNAmax kit (ThermoFisher) Cas9 mRNA was obtained from
SystemBio (CAS500A-1). Injections of fertilized zebrafish eggs were done with 50
ng/ul gRNA and 150 ng/ul Cas9 mRNA. Genotyping was performed using
5’-CCCTGGTCGGTGATTTAGGGTTAG-3’ as forward primer and 5’
CACCTCCCACTTCCTCGGCGCTTTCCAGCAGAATATCTTTGGTAAAATTAGAG-3’ as reverse
primer. PCRs using this primer pair yield a 178 bp wildtype band. Fish were
identified with a 47 bp deletion spanning the gRNA target site and yielding a
131 bp genotyping band. The deleted sequence is 5’
-CTGGGTCAGAGTTTGGGTCAGGTCGGGGGAAGCTTGTCTTCATTTAC-3’ and generates a
frameshift at the 12th amino acid residue of trip11.