Biology:CRISPR-associated transposons

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CRISPR-associated transposons or CASTs are mobile genetic elements (MGEs) that have evolved to make use of minimal CRISPR systems for RNA-guided transposition of their DNA.[1] Unlike traditional CRISPR systems that contain interference mechanisms to degrade targeted DNA, CASTs lack proteins and/or protein domains responsible for DNA cleavage.[2] Specialized transposon machinery, similar to that of the well characterized Tn7 transposon, complexes with the CRISPR RNA (crRNA) and associated Cas proteins for transposition.[1] CAST systems have been characterized in a wide range of bacteria and make use of variable CRISPR configurations including Type I-F, Type I-B, Type I-C, Type I-D, Type I-E, Type IV, and Type V-K.[1][2][3][4] MGEs remain an important part of genetic exchange by horizontal gene transfer and CASTs have been implicated in the exchange of antibiotic resistance and antiviral defense mechanisms, as well as genes involved in central carbon metabolism.[5][6] These systems show promise for genetic engineering due to their programmability, PAM flexibility, and ability to insert directly into the host genome without double strand breaks requiring activation of host repair mechanisms.[3][7]  They also lack Cas1 and Cas2 proteins and so rely on other more complete CRISPR systems for spacer acquisition in trans.[2][3]

Natural structure and function

CRISPR-associated transposons are similar to the Tn7 transposon which functions with a cut and paste mechanism.[1] It contains a heteromeric transposase consisting of TnsA and TnsB proteins, and a regulator protein TnsC.[1] Structural analysis has shown binding of the TnsB protein and sequence specific motifs on the ends of the transposon which allows for excision and mobility.[8] Targeting for integration is done by the TnsD or TnsE proteins which preferentially target safe sites within the host chromosome or mobile elements (plasmids or bacteriophages), respectively.[1] TnsE is not found in CASTs  but a TnsD homolog, TniQ, is present and functions to bridge the gap between the transposase and CRISPR-Cas.[9] Multiple CRISPR types have been found to associate with transposons with two of the most studied being Type I-F, which makes use of a multi-subunit effector (Cascade), and Type V-K, which makes use of a single Cas12k effector.[3][7] In both cases, Tn7 transposons have evolved to make use of these effectors to create R loops for site-specific integration.[3] While TnsA is present in Type I-F systems, it is notably absent in Type V-K systems which showed higher off-target integrations during initial characterization.[3][10]

Type IF-3

A Type IF-3 CAST (Tn6677) was initially identified in Vibrio Cholerae and has been extensively studied.[7] This system contains proteins TnsA, TnsB, and TnsC that complex with Cas6, Cas7, and a Cas5-Cas8 fusion through interactions with TniQ.[9] Initial integration steps include TniQ-Cascade binding at the target site and TnsA and TnsB excision of the transposon, which is followed by TnsC binding to TniQ and transposase binding to TnsC.[9] There can be off-targeting prior to this final step, but TnsB and TnsC binding leads to a final proofreading step to maintain a high on-target percentage.[11] Tn6677 integration has been validated at near 100% on-target efficiency at site specific locations in multiple points in the host genome.[7] Other systems have also been characterized and validated in this class with varying ranges of efficiency, and include orthogonal systems for multiplexed insertions up to 10kb.[6][12]

A unique characteristic of Type IF-3 systems is the presence of self-targeting guide RNA that are used to target the host chromosome. These systems have privatized the corresponding spacers through the use of atypical crRNA that prevent endogenous Type 1F systems from using the guides and their interference mechanisms to degrade the host.[13] Another privatization mechanism is the use of mismatch tolerance allowing only CAST systems to target locations in the genome without an exact match to the spacer.[13]

Type V-K

A Type V-K system was originally characterized from a cyanobacteria, Scytonema hofmanni, and contains a single Cas effector, Cas12k, that functions with a tracrRNA.[3] This system functions similarly to Tn7 but does not have a TnsA protein which can result in off-targeting and chimera formation during over-expression.[10] The Cas12k and tracrRNA complex bind to the target site and TnsC is polymerized directly adjacent prior to TniQ attachment and TnsB recognition and integration.[14] While these systems use traditional tracrRNA characteristic of Type II CRISPR systems, they can also target with short crRNA located adjacent to the transposon end.[15] Type V-K spacers preferentially target locations near tRNA genes, but other sites have been observed in these short crRNA guides which have been acquired by non-traditional means.[15]  

Applications in genetic engineering

CRISPR-associated transposons have been harnessed for in vitro and in vivo gene editing at different targets, in different hosts, and with different payloads. All CAST components of the Tn6677 system from Vibrio cholerae have been combined into a single plasmid and confirmed to deliver up to 10kb transposons at near 100% efficiency.[16] This has also been shown in a community context with conjugative delivery of suicide vectors to provide antibiotic resistance or enhanced metabolic function to only a single microbe.[17] Much of the initial characterization of these systems has been done in E. coli, but functionality has been confirmed in beta- and gammaproteobacteria with high efficiency, and in alphaproteobacteria at somewhat lower efficiency.[18] A single plasmid Tn677 has also been shown to function in human HEK293T cells showing potential therapeutic use in the future.[19]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 "Recruitment of CRISPR-Cas systems by Tn7-like transposons". Proceedings of the National Academy of Sciences of the United States of America 114 (35): E7358–E7366. August 2017. doi:10.1073/pnas.1709035114. PMID 28811374. Bibcode: 2017PNAS..114E7358P. 
  2. ↑ 2.0 2.1 2.2 "CRISPR-Cas in mobile genetic elements: counter-defence and beyond". Nature Reviews. Microbiology 17 (8): 513–525. August 2019. doi:10.1038/s41579-019-0204-7. PMID 31165781. 
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 "RNA-guided DNA insertion with CRISPR-associated transposases". Science 365 (6448): 48–53. July 2019. doi:10.1126/science.aax9181. PMID 31171706. Bibcode: 2019Sci...365...48S. 
  4. ↑ "Metagenomic discovery of CRISPR-associated transposons". Proceedings of the National Academy of Sciences of the United States of America 118 (49). December 2021. doi:10.1073/pnas.2112279118. PMID 34845024. Bibcode: 2021PNAS..11812279R. 
  5. ↑ Giovannoni, Stephen J., ed (December 2021). "Cargo Genes of Tn7-Like Transposons Comprise an Enormous Diversity of Defense Systems, Mobile Genetic Elements, and Antibiotic Resistance Genes". mBio 12 (6): e0293821. doi:10.1128/mBio.02938-21. PMID 34872347. 
  6. ↑ 6.0 6.1 "Evolutionary and mechanistic diversity of Type I-F CRISPR-associated transposons". Molecular Cell 82 (3): 616–628.e5. February 2022. doi:10.1016/j.molcel.2021.12.021. PMID 35051352. 
  7. ↑ 7.0 7.1 7.2 7.3 "Transposon-encoded CRISPR-Cas systems direct RNA-guided DNA integration". Nature 571 (7764): 219–225. July 2019. doi:10.1038/s41586-019-1323-z. PMID 31189177. 
  8. ↑ "Structural basis of transposon end recognition explains central features of Tn7 transposition systems". Molecular Cell 82 (14): 2618–2632.e7. July 2022. doi:10.1016/j.molcel.2022.05.005. PMID 35654042. 
  9. ↑ 9.0 9.1 9.2 "Structural basis of DNA targeting by a transposon-encoded CRISPR-Cas system". Nature 577 (7789): 271–274. January 2020. doi:10.1038/s41586-019-1849-0. PMID 31853065. 
  10. ↑ 10.0 10.1 "Precise cut-and-paste DNA insertion using engineered type V-K CRISPR-associated transposases". Nature Biotechnology 41 (7): 968–979. July 2023. doi:10.1038/s41587-022-01574-x. PMID 36593413. 
  11. ↑ "Selective TnsC recruitment enhances the fidelity of RNA-guided transposition". Nature 609 (7926): 384–393. September 2022. doi:10.1038/s41586-022-05059-4. PMID 36002573. Bibcode: 2022Natur.609..384H. 
  12. ↑ "Functional characterization of diverse type I-F CRISPR-associated transposons". Nucleic Acids Research 50 (20): 11670–11681. November 2022. doi:10.1093/nar/gkac985. PMID 36384163. 
  13. ↑ 13.0 13.1 "Guide RNA Categorization Enables Target Site Choice in Tn7-CRISPR-Cas Transposons". Cell 183 (7): 1757–1771.e18. December 2020. doi:10.1016/j.cell.2020.11.005. PMID 33271061. 
  14. ↑ "Target site selection and remodelling by type V CRISPR-transposon systems". Nature 599 (7885): 497–502. November 2021. doi:10.1038/s41586-021-04030-z. PMID 34759315. Bibcode: 2021Natur.599..497Q. 
  15. ↑ 15.0 15.1 "Dual modes of CRISPR-associated transposon homing". Cell 184 (9): 2441–2453.e18. April 2021. doi:10.1016/j.cell.2021.03.006. PMID 33770501. 
  16. ↑ "CRISPR RNA-guided integrases for high-efficiency, multiplexed bacterial genome engineering". Nature Biotechnology 39 (4): 480–489. April 2021. doi:10.1038/s41587-020-00745-y. PMID 33230293. 
  17. ↑ "Species- and site-specific genome editing in complex bacterial communities". Nature Microbiology 7 (1): 34–47. January 2022. doi:10.1038/s41564-021-01014-7. PMID 34873292. 
  18. ↑ "CRISPR-Associated Transposase for Targeted Mutagenesis in Diverse Proteobacteria". ACS Synthetic Biology 12 (7): 1989–2003. July 2023. doi:10.1021/acssynbio.3c00065. PMID 37368499. 
  19. ↑ "Targeted DNA integration in human cells without double-strand breaks using CRISPR-associated transposases". Nature Biotechnology: 1–12. March 2023. doi:10.1038/s41587-023-01748-1. PMID 36991112. 



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