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Generation of a pex1 zebrafish model by CRISPR/Cas9. (A,B) Targeting CRISPR sites in exon 5 of the zebrafish pex1 gene induced a 17 bp-deletion leading to a premature stop codon (MUT). (C) PCR on genomic DNA allows genotyping: wild-type (WT, 290 bp), heterozygous, and homozygous mutant (273 bp). (D) Amino-acid sequences of wildtype (WT, 1273 aa) versus mutated Pex1 protein (MUT, 305 aa), which is predicted to lack the AAA-ATPase domains essential for Pex1 function. The altered amino acid sequence resulting from the frameshift mutation is indicated in orange. (E) Proteomics-based analysis of Pex protein levels in livers from 7-month-old WT and pex1–/– zebrafish (data are means ± % CV for n = 3 biological replicates).
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