Title: Characterization and applications of Type I CRISPR-Cas systems

Journal Article · · Biochemical Society Transactions

CRISPR-Cas constitutes the adaptive immune system of bacteria and archaea. This RNA-mediated sequence-specific recognition and targeting machinery has been used broadly for diverse applications in a wide range of organisms across the tree of life. The compact class 2 systems, that hinge on a single Cas effector nuclease have been harnessed for genome editing, transcriptional regulation, detection, imaging and other applications, in different research areas. However, most of the CRISPR-Cas systems belong to class 1, and the molecular machinery of the most widespread and diverse Type I systems afford tremendous opportunities for a broad range of applications. These highly abundant systems rely on a multi-protein effector complex, the CRISPR associated complex for antiviral defense (Cascade), which drives DNA targeting and cleavage. The complexity of these systems has somewhat hindered their widespread usage, but the pool of thousands of diverse Type I CRISPR-Cas systems opens new avenues for CRISPR-based applications in bacteria, archaea and eukaryotes. Here, we describe the features and mechanism of action of Type I CRISPR-Cas systems, illustrate how endogenous systems can be reprogrammed to target the host genome and perform genome editing and transcriptional regulation by co-delivering a minimal CRISPR array together with a repair template. Moreover, we discuss how these systems can also be used in eukaryotes. Finally, this review provides a framework for expanding the CRISPR toolbox, and repurposing the most abundant CRISPR-Cas systems for a wide range of applications.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); North Carolina State Univ., Raleigh, NC (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1889422
Journal Information:
Biochemical Society Transactions, Journal Name: Biochemical Society Transactions Journal Issue: 1 Vol. 48; ISSN 0300-5127
Publisher:
Portland PressCopyright Statement
Country of Publication:
United States
Language:
English

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