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Related Concept Videos

DNA-only Transposons02:57

DNA-only Transposons

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DNA-only transposons are called autonomous transposons since they code for the enzyme transposase that is required for the transposition mechanism. Insertion of transposons can alter gene functions in multiple ways. They can mutate the gene, alter gene expression by introducing a novel promoter or insulator sequence, introduce new splice sites, and change the mRNA transcripts produced, or remodel chromatin structure.
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Transposons, or "jumping genes," are small mobile genetic elements (MGEs) that range from 700 to 40,000 base pairs in length. They are found in all organisms and can move within the same chromosome or transfer to different chromosomes. In some cases, transposons can also jump between different host DNA molecules, such as plasmids or viruses, contributing to genetic variability.Barbara McClintock first discovered these mobile genetic elements in the 1940s while studying maize genetics, and she...
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Transposons make up a significant part of genomes of various organisms. Therefore, it is believed that transposition played a major evolutionary role in speciation by changing genome sizes and modifying gene expression patterns. For example, in bacteria, transposition can lead to conferring antibiotic resistance. Movement of transposable elements within the genetic pool of pathogenic bacteria can aid in transfer of antibiotic-resistant genetic elements. In eukaryotes, transposons can carry out...
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Cis-regulatory sequences are short fragments of non-coding DNA that are present on the same chromosomes as the genes that they regulate. These fragments serve as binding sites for transcriptional regulators, proteins that are responsible for controlling gene transcription and differential gene expression across cell types in eukaryotes. Cis-regulatory sequences can be close to the gene of interest or thousands of bases away in the DNA sequence; however, those sequences that are further away are...
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As the name suggests, non-LTR retrotransposons lack the long terminal repeats characteristic of the LTR retrotransposons. Additionally, both LTR and non-LTR retrotransposons use distinct mechanisms of mobilization. Non-LTR retrotransposons are further divided into two classes - Long interspersed nuclear elements (LINEs) and short interspersed nuclear elements (SINEs), both of which occur abundantly in most mammals, including humans. Some of the active non-LTR retrotransposons in humans are L1...
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Generating Transposon Insertion Libraries in Gram-Negative Bacteria for High-Throughput Sequencing
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Targeting IS608 transposon integration to highly specific sequences by structure-based transposon engineering.

Natalia Rosalía Morero1, Cecilia Zuliani1, Banushree Kumar1

  • 1Structural and Computational Biology Unit, European Molecular Biology Laboratory, Heidelberg 69117, Germany.

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Researchers engineered the IS608 transposon for precise DNA targeting. This breakthrough allows programmable, site-specific gene insertions, overcoming limitations of natural transposable elements.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Transposable elements are DNA sequences that can change their position within a genome.
  • They are valuable tools for genetic engineering, including transgenesis and insertional mutagenesis.
  • However, limited target sequence specificity restricts their use in precise gene-targeting applications.

Purpose of the Study:

  • To elucidate the molecular mechanism of target recognition by the IS608 transposon from Helicobacter pylori.
  • To engineer IS608 variants with enhanced and programmable target specificity for site-directed DNA integration.
  • To explore the potential of the engineered IS608 system for precise gene insertion applications.

Main Methods:

  • Determining the crystal structure of the IS608 target capture complex in an active conformation.
  • Engineering IS608 variants by modifying transposon DNA to alter target site recognition.
  • In vitro validation of engineered transposon specificity and efficiency.

Main Results:

  • The crystal structure revealed detailed molecular interactions between the IS608 transposon and its target DNA.
  • Engineered IS608 variants demonstrated efficient and specific integration at designed 12/17-nucleotide target sites.
  • The secondary structure of the wild-type transposon intermediate was identified as a factor limiting its target specificity.

Conclusions:

  • The study presents a strategy for reprogramming IS608 transposon specificity by extending DNA base-pairing interactions.
  • This engineered system enables highly specific and programmable targeting of unique DNA sequences for gene insertion.
  • The findings open new avenues for utilizing the IS608 system in site-specific genetic engineering.