In vivo genome editing partially restores alpha1-antitrypsin in a murine model of AAT deficiency
Author:  Date:2018-03-29  Clicks:

Hum Gene Ther.2018 Mar 29. doi: 10.1089/hum.2017.225. [Epub ahead of print]

Invivogenomeeditingpartiallyrestoresalpha1-antitrypsinin amurinemodelofAATdeficiency.

Song CQ1,Wang D2,Jiang T3,O'Connor K4,Tang Q5,Cai L6,Li X7,Weng Z8,Yin H9,Gao G10,11,Mueller C12,Flotte TR13,Xue W14.

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Abstract

CRISPRgenomeeditingholds promise in the treatment of genetic diseases that currently lack effective long-term therapies. Patients with Alpha-1 Antitrypsin (AAT)deficiencydevelop progressive lung disease due to the loss ofAAT's antiprotease function and liver disease due to a toxic gain of function of the common mutant allele. However, it remains unknown whether CRISPR-mediatedAATcorrection in the liver, whereAATis primarily expressed, can correct either or both defects. Here we show that AAV delivery of CRISPR can effectively correct Z-AATmutation in the liver of a transgenic mousemodel. Specifically, we co-injected two AAV: one expressing Cas9 and another encoding anAATguide RNA and homology-dependent repair template. In both neonate and adult mice, this treatmentpartiallyrestored M-AATin the serum. Furthermore, deep sequencing confirmed both indel mutations and precise gene correction in the liver, permitting careful analysis of geneeditingevents invivo. This study demonstrates a proof-of-concept for the application of CRISPR-Cas9 technology to correctAATmutations invivoand validates continued exploration of this approach for the treatment of patients withAATdeficiency.

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