Latest Posts

All Posts

Your Top Requested Plasmid in 2015!

Posted by Tyler Ford on Dec 30, 2015 10:30:00 AM

We’ve dug into the data from our repository to find our most requested plasmid in 2015. In line with all of the exciting developments surrounding CRISPR genome engineering in the past year, we're excited to announce that the plasmid most requested from the Addgene repository in 2015 was...

Read More >

Topics: Fun, Inside Addgene, CRISPR, pooled libraries

Enhancing CRISPR Targeting Specificity with eSpCas9, SpCas9-HF1, & HypaCas9

Posted by Tyler Ford on Dec 16, 2015 10:30:00 AM

As evidenced by all the CRISPR publications, press, and plasmids out there, it’s obvious that CRISPR is a ground-breaking technology that’s already had a huge impact on research and will be affecting our everyday lives very soon. Not only is CRISPR having effects on various biological disciplines, the base technology itself is constantly improving. Cas9 variants have been modified for genome editing, activating gene expression, visualizing genomic loci, and much more. Now, researchers from the Zhang, Joung, and Doudna labs have improved the on-target specificity of the Cas9 nuclease with engineered variants: eSpCas9SpCas9-HF1, & HypaCas9.

Read More >

Topics: Genome Engineering, CRISPR

The PAM Requirement and Expanding CRISPR Beyond SpCas9

Posted by Joel McDade on Nov 12, 2015 10:30:00 AM

This post was updated on Dec 5, 2017.

Diverse genomes and genomic targets require a variety of tools to engineer them effectively. Since the discovery and engineering of dCas9, the CRISPR toolbox has expanded to include a variety of natural and engineered Cas proteins. Read on to learn how these tools can be used to expand CRISPR's reach to new genomic loci. 

Read More >

Topics: Genome Engineering, CRISPR

The CRISPR Software Matchmaker: A New Tool for Choosing the Best CRISPR Software for Your Needs

Posted by Guest Blogger on Nov 3, 2015 10:30:00 AM

This post was contributed by guest blogger Cameron MacPherson at the Institut Pasteur

CRISPR Software and the Piñata Effect

Two years ago I was a part of a group (Biology of Host-parasite Interactions, Institut Pasteur, Paris) that changed genome editing in the malaria community for the better (Nat. Biotechnol., 2014). Given the timing, it shouldn’t be a surprise that the CRISPR system was involved. Today, that same laboratory enjoys a successful edit rate of over 90% in their work editing the genome of Plasmodium falciparum (the parasite that causes malaria). I attribute their success to technical expertise, thoughtful single guide RNA (sgRNA) design, and the abnormally low GC content of the Plasmodium falciparum genome. To put this last point into perspective, the Plasmodium falciparum genome contains only 0.66 million targetable NGG PAM sites whereas the human genome has about 300 million. With such a sparsely targetable genome, off-targeting is less of a worry and on-targeting likely more efficient. 

Read More >

Topics: Genome Engineering, CRISPR

Cpf1: A New Tool for CRISPR Genome Editing

Posted by Mary Gearing on Oct 14, 2015 10:30:00 AM

This post was updated on Dec 5, 2017.

In 2015, Zetsche et al. added to the CRISPR toolbox with their characterization of two Cpf1 orthologs that display cleavage activity in mammalian cells. Like Cas9 nucleases, Cpf1 family members contain a RuvC-like endonuclease domain, but they lack Cas9’s second HNH endonuclease domain. Cpf1 cleaves DNA in a staggered pattern and requires only one RNA rather than the two (tracrRNA and crRNA) needed by Cas9 for cleavage. In certain cases, Cpf1 may be better suited for genome editing than Cas9 - read on to learn more about Cpf1 and check out our CRISPR guide for a refresher on CRISPR/Cas9. 

Read More >

Topics: Genome Engineering, CRISPR

Blog Logo Vertical-01.png
Click here to subscribe to the Addgene Blog
 
Subscribe