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Genomic DNA in Prokaryotes00:46

Genomic DNA in Prokaryotes

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The genome of most prokaryotic organisms consists of double-stranded DNA organized into one circular chromosome in a region of cytoplasm called the nucleoid. The chromosome is tightly wound, or supercoiled, for efficient storage. Prokaryotes also contain other circular pieces of DNA called plasmids. These plasmids are smaller than the chromosome and often carry genes that confer adaptive functions, such as antibiotic resistance.
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Microbial communities are dynamic environments where cell lysis releases free DNA into the surroundings. Other cells can take up this extracellular DNA through a process known as transformation.When a cell incorporates this foreign DNA into its genome, resulting in genetic modification, the process is known as transformation. Cells capable of this process are termed competent. Competence can be natural, as observed in certain bacteria and archaea, or artificially induced in the...
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Conjugation is a form of horizontal gene transfer that primarily occurs in bacteria and some archaea, promoting genetic diversity and adaptation. Bacteria can acquire resistance genes through conjugative plasmids, allowing them to survive antibiotic treatments that would otherwise be lethal. This process involves direct contact between cells through specialized structures such as the sex pilus and is mediated by conjugative plasmids, including the F (fertility) factor.Conjugation requires...
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Bacterial conjugation is a mechanism of horizontal gene transfer that enables the exchange of genetic material between bacterial cells through direct contact. This process is facilitated by a donor cell carrying a conjugative plasmid, which encodes genes necessary for pilus formation, DNA replication, and transfer. The conjugative plasmid plays a central role in initiating and executing the transfer of genetic material.The tra region of the conjugative plasmid encodes proteins responsible for...
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Site-specific Bacterial Chromosome Engineering: &#934;C31 Integrase Mediated Cassette Exchange (IMCE)
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High-throughput DNA engineering by mating bacteria.

Takeshi Matsui1,2, Po-Hsiang Hung1,3, Han Mei1,2,4

  • 1BacStitch DNA, Inc., Los Altos CA.

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|September 16, 2024
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Summary
This summary is machine-generated.

We developed SCRIVENER, an in vivo DNA assembly platform using bacterial conjugation and recombination. This simpler, cheaper, high-throughput method accelerates DNA engineering and product development cycles.

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Area of Science:

  • Synthetic Biology
  • Molecular Biology
  • Biotechnology

Background:

  • Current DNA assembly methods are complex and costly.
  • Scaling DNA engineering requires streamlined, efficient technologies.

Purpose of the Study:

  • To introduce SCRIVENER, an in vivo DNA assembly platform.
  • To demonstrate its efficiency, scalability, and error-handling capabilities.

Main Methods:

  • SCRIVENER utilizes sequential conjugation and recombination for in vivo DNA elongation.
  • It integrates bacterial conjugation, in vivo DNA cutting, and homologous recombination.
  • The platform assembles DNA blocks within E. coli arrays or pools.

Main Results:

  • Successfully performed over 5,000 DNA assemblies with 2-13 blocks (240 bp to 8 kb).
  • Assembled constructs up to 23 kb with high throughput and fidelity.
  • Identified deletions between long interspersed repeats as primary errors, manageable through replication and verification.

Conclusions:

  • SCRIVENER offers a simpler, cheaper, and higher-throughput alternative to existing DNA assembly methods.
  • The platform enables high-throughput construction and repurposing of DNA blocks without PCR.
  • SCRIVENER has the potential to accelerate design-build-test-learn cycles in DNA product development.