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RNA Editing

RNA Editing

RNA editing is a post-transcriptional modification where a precursor mRNA (pre-mRNA) nucleotide sequence is changed by base insertion, deletion, or modification. The extent of RNA editing varies from a few hundred bases, in mitochondrial DNA of trypanosomes, to a just single base, in nuclear genes of mammals. Even a single base change in the pre-mRNA can convert a codon for one amino acid into the codon for another amino acid or a stop codon. This type of re-coding can significantly affect the...

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Developing a Base Editing System for Marine Roseobacter Clade Bacteria.

Ying Wei¹, Li-Juan Feng^1,2, Xian-Zheng Yuan^1,3

¹School of Environmental Science and Engineering, Shandong University, Qingdao 266237, China.

ACS Synthetic Biology

|July 12, 2023

Summary

Scientists developed a new CRISPR-Cas base editing tool for Roseobacter bacteria, enabling precise genome editing without DNA breaks. This breakthrough facilitates research into marine microbes and synthetic biology applications.

Keywords:

CRISPR Roseovarius nubinhibens base editing marine Roseobacter clade

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Area of Science:

Marine Microbiology
Synthetic Biology
Genome Engineering

Background:

Roseobacter clade bacteria are crucial for marine ecosystems and biogeochemical cycles.
Their metabolic versatility makes them promising candidates for marine synthetic biology.
Efficient genome editing tools are needed for this important bacterial group.

Purpose of the Study:

To adapt and apply a CRISPR-Cas-based base editing system for precise genome modification in Roseobacter clade bacteria.
To demonstrate the system's efficacy in the model organism Roseovarius nubinhibens.
To investigate the beta-ketoadipate pathway and identify novel regulatory elements.

Main Methods:

Adaptation of a CRISPR-Cas9 system with nuclease-deactivated Cas9 and deaminase for base editing.
Application of the system in Roseovarius nubinhibens for single-nucleotide resolution genome editing.
Introduction of premature STOP codons to interrogate gene essentiality in the beta-ketoadipate pathway.

Main Results:

Achieved precise and efficient genome editing without double-strand breaks or donor DNA.
Demonstrated the essentiality of genes within the beta-ketoadipate pathway.
Experimentally identified PcaQ as a transcription activator for the first time.

Conclusions:

This work represents the first CRISPR-Cas-based genome editing in the Roseobacter clade.
The developed base editing system provides a powerful tool for studying marine microbial ecology and biogeochemistry.
It opens new possibilities for the synthetic biology of Roseobacter bacteria.