Sharon Begley, 02 February 2018, STAT, https://www.statnews.com/2018/02/02/crispr-blindness-retinitis-pigmentosa/
Many diseases are the result of a single mutated allele. To correct these with a CRISPR-based system, the mutated allele should be targeted while the healthy allele is left untouched. In one of the first papers to be published in The CRISPR Journal, researchers have developed a method to target the “broken” allele while leaving the healthy allele untouched. This proof of concept work was done in a mouse retinitis pigmentosa model, where blindness is caused by a single nucleotide change in one allele. Results have been published on the BioRxiv prepress server (https://www.biorxiv.org/content/early/2018/01/29/197962).