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CRISPR 101: Non-Homologous End Joining

Posted by Guest Blogger on Apr 16, 2015 11:45:08 AM

This post was contributed by David Wyatt and Dale Ramsden, UNC at Chapel Hill.

One advantage to using the CRISPR/Cas system for genome engineering is the fact that Cas9 can be easily programmed to make a DNA double strand break (DSB) in the genome wherever the user chooses. After the initial cut, the next steps in the process involve repairing chromosomal DSBs. It is important to know that cells possess two major repair pathways  Non-Homologous End Joining (NHEJ) and Homology Directed Repair (HDR) – and how these pathways work, as this could be relevant when planning your experiment. This blog has previously considered the HDR pathway; below we’ll discuss NHEJ, and how it impacts what happens to Cas9-mediated DSBs in the genome.

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Topics: Genome Engineering, CRISPR, CRISPR 101

CRISPR 101: Homology Directed Repair

Posted by Chari Cortez on Mar 12, 2015 1:48:00 PM

This post was updated on November 3, 2017.

DNA lesions are sites of structural or base-pairing damage of DNA. Perhaps the most harmful type of lesion results from breakage of both DNA strands – a double-strand break (DSB) – as repair of DSBs is paramount for genome stability. DSBs can be caused by intracellular factors such as nucleases and reactive oxygen species, or external forces such as ionizing radiation and ultraviolet light; however, these types of breaks occur randomly and unpredictably. To provide some control over the location of the DNA break, scientists have engineered plasmid-based systems that can target and cut DNA at specified sites. Regardless of what causes the DSB, the repair mechanisms function in the same way.

In this post, we will describe the general mechanism of homology directed repair with a focus on repairing breaks engineered in the lab for genome modification purposes.

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Topics: Genome Engineering, CRISPR, CRISPR 101

CRISPR 101: A New Series on Genome Editing & CRISPR-Cas

Posted by Marcy Patrick on Mar 5, 2015 12:06:12 PM

I am sure by now you have heard of CRISPRs. (If not, you can get up to speed here and here and here.) With such a fast moving technology, it is sometimes hard to keep pace with the new advances let alone remember the (maybe) long forgotten details of the biological process required to effectively design and utilize these tools. We certainly understand and are here to help!

Starting next week, we'll release the first post in our newest blog series - CRISPR 101 - a companion series to our popular Plasmids 101 articles. These posts are created to educate all levels of scientists and provide a resource for some of the basic principles driving CRISPRs and genome editing technology.

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Topics: Genome Engineering, Plasmids 101, CRISPR, CRISPR 101

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