PMID- 27587996 OWN - NLM STAT- PubMed-not-MEDLINE DCOM- 20160902 LR - 20200929 IS - 1662-5099 (Print) IS - 1662-5099 (Electronic) IS - 1662-5099 (Linking) VI - 9 DP - 2016 TI - The Development of a Viral Mediated CRISPR/Cas9 System with Doxycycline Dependent gRNA Expression for Inducible In vitro and In vivo Genome Editing. PG - 70 LID - 10.3389/fnmol.2016.00070 [doi] LID - 70 AB - The RNA-guided Cas9 nuclease, from the type II prokaryotic Clustered Regularly Interspersed Short Palindromic Repeats (CRISPR) adaptive immune system, has been adapted and utilized by scientists to edit the genomes of eukaryotic cells. Here, we report the development of a viral mediated CRISPR/Cas9 system that can be rendered inducible utilizing doxycycline (Dox) and can be delivered to cells in vitro and in vivo utilizing adeno-associated virus (AAV). Specifically, we developed an inducible gRNA (gRNAi) AAV vector that is designed to express the gRNA from a H1/TO promoter. This AAV vector is also designed to express the Tet repressor (TetR) to regulate the expression of the gRNAi in a Dox dependent manner. We show that H1/TO promoters of varying length and a U6/TO promoter can edit DNA with similar efficiency in vitro, in a Dox dependent manner. We also demonstrate that our inducible gRNAi vector can be used to edit the genomes of neurons in vivo within the mouse brain in a Dox dependent manner. Genome editing can be induced in vivo with this system by supplying animals Dox containing food for as little as 1 day. This system might be cross compatible with many existing S. pyogenes Cas9 systems (i.e., Cas9 mouse, CRISPRi, etc.), and therefore it likely can be used to render these systems inducible as well. FAU - de Solis, Christopher A AU - de Solis CA AD - School of Behavioral and Brain Sciences, Department of Molecular and Cell Biology, University of Texas at Dallas Richardson, TX, USA. FAU - Ho, Anthony AU - Ho A AD - School of Behavioral and Brain Sciences, Department of Molecular and Cell Biology, University of Texas at Dallas Richardson, TX, USA. FAU - Holehonnur, Roopashri AU - Holehonnur R AD - School of Behavioral and Brain Sciences, Department of Molecular and Cell Biology, University of Texas at Dallas Richardson, TX, USA. FAU - Ploski, Jonathan E AU - Ploski JE AD - School of Behavioral and Brain Sciences, Department of Molecular and Cell Biology, University of Texas at Dallas Richardson, TX, USA. LA - eng GR - R21 MH109945/MH/NIMH NIH HHS/United States PT - Journal Article DEP - 20160818 PL - Switzerland TA - Front Mol Neurosci JT - Frontiers in molecular neuroscience JID - 101477914 PMC - PMC4988984 OTO - NOTNLM OT - AAV vectors OT - CRISPR/Cas9 OT - TET2 OT - TRE3G OT - amygdala OT - doxycycline OT - genome editing OT - inducible EDAT- 2016/09/03 06:00 MHDA- 2016/09/03 06:01 PMCR- 2016/01/01 CRDT- 2016/09/03 06:00 PHST- 2016/06/16 00:00 [received] PHST- 2016/07/29 00:00 [accepted] PHST- 2016/09/03 06:00 [entrez] PHST- 2016/09/03 06:00 [pubmed] PHST- 2016/09/03 06:01 [medline] PHST- 2016/01/01 00:00 [pmc-release] AID - 10.3389/fnmol.2016.00070 [doi] PST - epublish SO - Front Mol Neurosci. 2016 Aug 18;9:70. doi: 10.3389/fnmol.2016.00070. eCollection 2016.