Easi-CRISPR a breakthrough in genome engineering

by Kalani Simpson, UNMC public relations | May 18, 2017

Image with caption: Channabasavaiah Gurumurthy, Ph.D., M.V.S.C. (D.V.M.), associate professor of developmental neuroscience at UNMC's Munroe-Meyer Institute

Channabasavaiah Gurumurthy, Ph.D., M.V.S.C. (D.V.M.), associate professor of developmental neuroscience at UNMC's Munroe-Meyer Institute

A study published May 17 in the journal Genome Biology shows how highly popular, custom genetically engineered animal models are easily generated using a new, patent-pending technology called Easi (Efficient additions with ssDNA inserts)-CRISPR. Easi-CRISPR allows researchers to create these much-needed animal models at previously unheard of rates and significantly lower cost.

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From left, Dr. Gurumurthy and his UNMC team, Rolen Quadros and Donald Harms.
"With Easi-CRISPR, creating knock-in mice is as simple as using 'Find' and 'Edit' in Microsoft Word," said Paula Turpen, Ph.D., director for research resources at UNMC. Dr. Turpen likened previous genetic-engineering methods to reading through a manuscript and making changes with a manual typewriter and a bottle of liquid "Wite-Out."

Channabasavaiah Gurumurthy, Ph.D., M.V.S.C. (D.V.M.), associate professor of developmental neuroscience at UNMC's Munroe-Meyer Institute, is primary investigator.

Building off the CRISPR-Cas genome editing methods, Easi-CRISPR is the crucial next step in genome engineering to create designer animal models.

These models help scientists study the role of genes and mutations in human diseases, and explore the use of gene therapy and other potential treatments.

CRISPR was a groundbreaking advance, allowing scientists to "cut" individual genes from a genome as a replacement for creating "knockout" models. But, generating more complicated knock-in and conditional knockouts -- which comprise over 90 percent of animal models created -- still proved inefficient, challenging and expensive.

A recent Science Magazine news article captured the frustration of the research community about the poor efficiency of the available CRISPR methods.

Easi-CRISPR, by contrast, enables the insertion of long DNA sequences into CRISPR-cut genomes at efficiencies of up to 100 percent.

Dr. Gurumurthy said increased efficiencies are the result of inserting long single-stranded DNA, rather than double-stranded DNA. The idea came to his long-term collaborator, Masato Ohtsuka, Ph.D., of Japan's Tokai University, while the two scientists were literally scribbling on a napkin at a conference in 2014.

Dr. Gurumurthy said several independent labs have already been able to reproduce the Easi-CRISPR study's results, thanks to its early online posting on the preprint server BioRxiv.

Easi-CRISPR is the result of an international collaboration between seven institutions, headed by Drs. Gurumurthy and Ohtsuka, with Dr. Suzanne Mansour of the University of Utah as a major collaborator. The collaboration includes Integrated DNA Technologies (IDT), a global leader in custom nucleic acid synthesis and genome editing products, based in Coralville, Iowa.

"The present study demonstrates how efficiently DNA sequences can be introduced into a genome using long single-stranded DNA combined with Cas9 protein," Mark Behlke, M.D., Ph.D., IDT's chief scientific officer, said. "We are excited to help advance this field with our products. The work presented here should be of high interest to everyone generating animal models using CRISPR technology."


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Mukesh Gandhari
August 29, 2019 at 5:02 AM

Guru Congratulations....This is result of your hard work.....Great to associate with you during your postdoc at Evanston.....Mukesh Gandhari

January 03, 2018 at 8:52 AM


Kim Bainbridge
May 18, 2017 at 12:50 PM

Guru it is a pleasure to work with you. Congratulations!

May 18, 2017 at 11:11 AM

Great congratulations.. Santosh., UNMC

Jerrie Dayton
May 18, 2017 at 9:34 AM

Congratulations Guru on this well deserved recognition. I know how hard you work. You've furthered the science and helped speed up future progress and possible breakthroughs in disease research for all of us. Thank you for your tireless work.