Journal: Molecular Therapy. Methods & Clinical Development

Article Title: In Vitro and In Vivo Genetic Disease Modeling via NHEJ-Precise Deletions Using CRISPR-Cas9

doi: 10.1016/j.omtm.2020.10.007

Figure Lengend Snippet: Design and Use of CRISPR gRNAs in HEK293T Cell Line (A) Exon 9 of the human PKLR gene is represented. Vertical lines and arrows are reported mutations, corresponding to one or more than 1 nt affected, respectively. Horizontal dashed lines represent the two gRNAs used. Vertical dashed lines represent predicted cut sites of gRNAs selected. (B) Sorting of green fluorescence based on the ZsGreen present in the electroporated plasmids. A 530/40- versus 580/30-nm dot plot was used to distinguish ZsGreen fluorescence from autofluorescence. The figure represents the ZsGreen fluorescence of the cell electroporated with the plasmid DNA containing only the Cas9 and the ZsGreen cDNAs (C), or containing the Cas9, the ZsGreen cDNAs and the sequences of the guide I (I) or the guide II (II). (C) Surveyor assay of the DNA obtained from the cells electroporated with the plasmids containing no guide, guide I, guide II, or both guides together (I+II). The gene editing generates a characteristic band pattern for guide I (160 bp + 135 bp), for guide II (191 bp + 104 bp), and a mixed pattern when both are used at the same time (160 bp + 104 bp). (D) Scheme of the band sizes that appear in (C) showing the 31-bp deletion resulting after the simultaneous electroporation of guides I and II.

Article Snippet: The HEK293T cell line (human embryonic kidney cell line competent to replicate vectors carrying the SV40 T antigen; ATCC, CRL-3219) was cultured in Iscove’s modified Dulbecco’s medium (IMDM; Gibco), HyClone fetal bovine serum (10%; GE Healthcare), and penicillin/streptomycin (1%; Gibco).

Techniques: CRISPR, Fluorescence, Plasmid Preparation, Electroporation