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Crispr Cas12

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https://www.readbyqxmd.com/read/30076736/in-silico-processing-of-the-complete-crispr-cas-spacer-space-for-identification-of-pam-sequences
#1
Brian J Mendoza, Cong T Trinh
Despite extensive exploration of the diversity of CRISPR-Cas (Clustered Regularly Interspaced Short Palindromic Repeats, CRISPR associated) systems, biological applications have been mostly confined to Class 2 systems, specifically the Cas9 and Cas12 (formerly Cpf1) single effector proteins. A key limitation of exploring and utilizing other CRISPR-Cas systems with unique functionalities, particularly Class I types and their multi-protein effector complex, is the knowledge of the system's protospacer adjacent motif (PAM) sequence identity...
August 4, 2018: Biotechnology Journal
https://www.readbyqxmd.com/read/29710373/transforming-plant-biology-and-breeding-with-crispr-cas9-cas12-and-cas13
#2
REVIEW
Patrick Schindele, Felix Wolter, Holger Puchta
Currently, biology is revolutionized by ever growing applications of the CRISPR/Cas system. As discussed in this Review, new avenues have opened up for plant research and breeding by the use of the sequence-specific DNases Cas9 and Cas12 (formerly named Cpf1) and, more recently, the RNase Cas13 (formerly named C2c2). Although double strand break-induced gene editing based on error-prone nonhomologous end joining has been applied to obtain new traits, such as powdery mildew resistance in wheat or improved pathogen resistance and increased yield in tomato, improved technologies based on CRISPR/Cas for programmed change in plant genomes via homologous recombination have recently been developed...
June 2018: FEBS Letters
https://www.readbyqxmd.com/read/29575326/the-crispr-cas-revolution-reaches-the-rna-world-cas13-a-new-swiss-army-knife-for-plant-biologists
#3
REVIEW
Felix Wolter, Holger Puchta
Application of the bacterial CRISPR/Cas systems to eukaryotes is revolutionizing biology. Cas9 and Cas12 (previously called Cpf1) are widely used as DNA nucleases for inducing site-specific DNA breaks for different kinds of genome engineering applications, and in their mutated forms as DNA-binding proteins to modify gene expression. Moreover, histone modifications, as well as cytosine methylation or base editing, were achieved with these systems in plants. Recently, with the discovery of the nuclease Cas13a (previously called C2c2), molecular biologists have obtained a system that enables sequence-specific cleavage of single-stranded RNA molecules...
June 2018: Plant Journal: for Cell and Molecular Biology
https://www.readbyqxmd.com/read/29449511/crispr-cas12a-target-binding-unleashes-indiscriminate-single-stranded-dnase-activity
#4
Janice S Chen, Enbo Ma, Lucas B Harrington, Maria Da Costa, Xinran Tian, Joel M Palefsky, Jennifer A Doudna
CRISPR-Cas12a (Cpf1) proteins are RNA-guided enzymes that bind and cut DNA as components of bacterial adaptive immune systems. Like CRISPR-Cas9, Cas12a has been harnessed for genome editing on the basis of its ability to generate targeted, double-stranded DNA breaks. Here we show that RNA-guided DNA binding unleashes indiscriminate single-stranded DNA (ssDNA) cleavage activity by Cas12a that completely degrades ssDNA molecules. We find that target-activated, nonspecific single-stranded deoxyribonuclease (ssDNase) cleavage is also a property of other type V CRISPR-Cas12 enzymes...
April 27, 2018: Science
https://www.readbyqxmd.com/read/29107822/molecular-architectures-and-mechanisms-of-class-2-crispr-associated-nucleases
#5
REVIEW
Carmela Garcia-Doval, Martin Jinek
Prokaryotic Class 2 CRISPR-Cas systems mediate adaptive immunity against invasive genetic elements by means of standalone effector proteins that function as RNA-guided nucleases. The effectors Cas9 and Cas12 generate double-strand breaks in DNA substrates, which has been exploited for genome editing applications. In turn, Cas13 enzymes function as RNA-guided ribonucleases whose non-specific activity is triggered by target RNA binding. In this review, we highlight recent structural investigations of Cas9, Cas12 and Cas13 nucleases that have illuminated many aspects of their molecular mechanisms...
December 2017: Current Opinion in Structural Biology
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