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CRISPR

CRISPR

Genome editing technologies allow scientists to modify an organism’s DNA via the addition, removal, or rearrangement of genetic material at specific genomic locations. These types of techniques could potentially be used to cure genetic disorders such as hemophilia and sickle cell anemia. One popular and widely used DNA-editing research tool that could lead to safe and effective cures for genetic disorders is the CRISPR-Cas9 system. CRISPR-Cas9 stands for Clustered Regularly Interspaced...

CRISPR and crRNAs

CRISPR and crRNAs

Bacteria and archaea are susceptible to viral infections just like eukaryotes; therefore, they have developed a unique adaptive immune system to protect themselves. Clustered regularly interspaced short palindromic repeats and CRISPR-associated proteins (CRISPR-Cas) are present in more than 45% of known bacteria and 90% of known archaea.
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Information enters the brain through encoding, which is the input of information into the memory system. Once sensory information is received from the environment, the brain labels or codes it. The information is then organized with similar information and connected to existing concepts. Encoding occurs through automatic processing and effortful processing.
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Defense Against Bacterial Pathogens

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Defense Mechanism Against Infection

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Precise Phage Mutagenesis with NgTET-Assisted CRISPR-Cas Systems

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Phage-Encoded Anti-CRISPR Defenses.

Sabrina Y Stanley¹, Karen L Maxwell²

¹Department of Molecular Genetics, University of Toronto, Toronto, Ontario M5S 1A8, Canada.

Annual Review of Genetics

|September 13, 2018

Summary

Bacteria and bacteriophages (phages) engage in an evolutionary arms race. Phages have developed anti-CRISPR proteins to overcome bacterial CRISPR-Cas defenses, impacting bacterial evolution and biotechnology.

Keywords:

CRISPR-Cas Cas9 Cascade anti-CRISPR bacteriophage

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Area of Science:

Microbiology
Molecular Biology
Evolutionary Biology

Background:

Bacteria and bacteriophages (phages) are locked in a continuous evolutionary arms race.
Bacterial CRISPR-Cas systems provide adaptive immunity against phage infections.
Phages have evolved anti-CRISPR proteins to counteract bacterial defenses.

Purpose of the Study:

To describe the discovery and mechanisms of action of anti-CRISPR proteins.
To discuss the evolutionary implications of anti-CRISPRs in the bacterial-phage arms race.
To explore the impact of anti-CRISPRs on CRISPR-Cas-based biotechnology.

Main Methods:

Discovery of anti-CRISPR proteins through various research approaches.
Elucidation of anti-CRISPR protein mechanisms of action.
Analysis of evolutionary trajectories and origins of anti-CRISPRs.

Main Results:

Identification and characterization of diverse anti-CRISPR proteins.
Understanding how anti-CRISPRs inhibit CRISPR-Cas systems.
Evidence of ongoing co-evolution between CRISPR-Cas and anti-CRISPRs.

Conclusions:

Anti-CRISPR proteins are key players in the bacterial-phage evolutionary arms race.
These proteins have significant implications for bacterial genome evolution.
Anti-CRISPRs present both challenges and opportunities for CRISPR-Cas biotechnological applications.