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10-Dec-2016 20:08 by 2 Comments

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This renders C57BL/6NTac an unsuitable background strain for investigating potential ARHL-causing genes.Over recent years several technologies have been developed that allow targeting of specific DNA sequences directly in the zygote, e.g.

These are nuclease-based approaches which generate DNA double-stranded breaks (DSBs) at user-defined genomic sequences.To investigate potential Cas9-mediated ‘off-target’ mutations in our corrected mouse, we undertook whole-genome sequencing and assessed the ‘off-target’ sites predicted for the guide RNAs (≤4 nucleotide mis-matches).No induced sequence changes were identified at any of these sites.As a result, the new restriction sites have been integrated between the T7 promoter and the single guide RNA (sg RNA) backbone sequence, and can be used to linearise the plasmid for further cloning of chosen protospacer sequences.Cas9 mutant D10A nickase sequence was PCR amplified from p X335 plasmid (Addgene, 42335; Feng Zhang, MIT) using high fidelity Expand Long Range d NTPack (Roche) and oligonucleotides Cas9f4gibson/Cas9r4gibson (Sigma-Aldrich).The presence of a DSB initiates a repair mechanism that typically leads to non-homologous end joining (NHEJ), resulting in insertion or deletion (indels) events at the targeted locus.

However, if the nucleases are used in conjunction with a donor DNA sequence carrying the desired insert with flanking homology to the targeted region, integration by homology directed repair (HDR) can occur. [ mutation directly in C57BL/6N zygotes using a TALEN-mediated HDR approach, showing recovery of a normal retinal phenotype in heterozygous repaired animals.

One such mutation is the allele directly in C57BL/6NTac zygotes.

Employing offset-nicking Cas9 (D10A) nickase with paired RNA guides and a single-stranded oligonucleotide donor template we show that allele repair was successfully achieved.

Analysis of the enzymatic digestions were analysed by electrophoresis on 1.5 % agarose gel containing ethidium bromide (Fisher Scientific).

], employing a Femtoj Jet (Eppendorf) and C57BL/6NTac embryos.

All animals were housed and maintained in the Mary Lyon Centre, MRC Harwell under specific opportunistic pathogen-free (SOPF) conditions, in individually ventilated cages adhering to environmental conditions as outlined in the Home Office Code of Practice.

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