Int J Biol Sci 2017; 13(12):1470-1478. doi:10.7150/ijbs.21312
CRISPR-offinder: a CRISPR guide RNA design and off-target searching tool for user-defined protospacer adjacent motif
1. Key Laboratory of Agricultural Animal Genetics, Breeding and Reproduction of Ministry of Education & Key Laboratory of Swine Genetics and Breeding of Ministry of Agriculture, College of Animal Science and Technology, Huazhong Agricultural University, Wuhan 430070, P. R. China;
Designing efficient and specific CRISPR single-guide RNAs (sgRNAs) is vital for the successful application of CRISPR technology. Currently, a growing number of new RNA-guided endonucleases with a different protospacer adjacent motif (PAM) have been discovered, suggesting the necessity to develop a versatile tool for designing sgRNA to meet the requirement of different RNA-guided DNA endonucleases. Here, we report the development of a flexible sgRNA design program named “CRISPR-offinder”. Support for user-defined PAM and sgRNA length was provided to increase the targeting range and specificity. Additionally, evaluation of on- and off-target scoring algorithms was integrated into the CRISPR-offinder. The CRISPR-offinder has provided the bench biologist a rapid and efficient tool for identification of high quality target sites, and it is freely available at
Keywords: genome editing, user-defined protospacer adjacent motif, off-target.
This is an open access article distributed under the terms of the Creative Commons Attribution (CC BY-NC) license (https://creativecommons.org/licenses/by-nc/4.0/). See http://ivyspring.com/terms for full terms and conditions.
How to cite this article:
Zhao C, Zheng X, Qu W, Li G, Li X, Miao YL, Han X, Liu X, Li Z, Ma Y, Shao Q, Li H, Sun F, Xie S, Zhao S. CRISPR-offinder: a CRISPR guide RNA design and off-target searching tool for user-defined protospacer adjacent motif. Int J Biol Sci 2017; 13(12):1470-1478. doi:10.7150/ijbs.21312. Available from http://www.ijbs.com/v13p1470.htm