Insertion Sequences
Insertion Sequences - Related Videos
08:19
Generating Transposon Insertion Libraries in Gram-Negative Bacteria for High-Throughput Sequencing
0 Views •
Cited by 16 •
2020
We describe a method to generate saturating transposon mutant libraries in Gram-negative bacteria and subsequent preparation of DNA amplicon libraries for high-throughput sequencing. As an example, we focus on the ESKAPE pathogen, Acinetobacter baumannii, but this protocol is amenable to a wide range of Gram-negative organisms.
04:24
TALEN-Mediated Targeted Gene Integration: Using Engineered Sequence-Specific Nucleases for the Precise Insertion of Fluorescent Protein Gene into hiPSCs
0 Views •
2025
This video describes a precise genome editing technique in human induced pluripotent stem cells, or hiPSCs, using TALENs to create double-stranded breaks at a targeted locus, inducing homology-directed repair for fluorescence protein gene integration.
11:39
Peripheral Intravenous Catheter Insertion
0 Views •
2023
Source: Madeline Lassche, MSNEd, RN and Katie Baraki, MSN, RN, College of Nursing, University of Utah, UT The purpose of peripheral intravenous catheter (PIV) insertion is to infuse medications, perform intravenous (IV) fluid therapy, or inject radioactive tracers for special examination procedures. Placing a PIV is an invasive procedure and requires the use of an aseptic, no-touch technique. Common IV venipuncture sites are the arms and hands in adults and the feet in children. According to...
08:57
Amplicon Sequencing using the Long-Read Sequencing Technologies
0 Views •
2025
This protocol was optimized for targeted deep sequencing of 18 drug-resistance regions in Mycobacterium tuberculosis using a long-read sequencing platform, followed by analysis with a tuberculosis-specific bioinformatics pipeline designed for long-read data.
09:55
Transposon-insertion Sequencing as a Tool to Elucidate Bacterial Colonization Factors in a Burkholderia gladioli Symbiont of Lagria villosa Beetles
0 Views •
Cited by 2 •
2021
This is an adapted method for identifying candidate insect colonization factors in a Burkholderia beneficial symbiont. The beetle host is infected with a random mutant library generated via transposon mutagenesis, and library complexity after colonization is compared to a control grown in vitro.
FAQs
The terminal inverted repeats act as sequence landmarks for the transposase, the enzyme that processes the element’s ends and catalyzes DNA insertion. Recognition of these repeats allows the element to be handled as a defined genetic unit rather than as an arbitrary DNA fragment. This end-directed mechanism determines where movement begins and enables relocation to another genomic site.
Cut-and-paste movement removes an insertion sequence from one DNA location before placing it at another, whereas replicative movement allows the original location and a newly inserted copy to coexist. These pathways therefore differ in whether movement changes copy number. That distinction helps explain why bacterial genomes can accumulate multiple related elements and undergo different patterns of genetic change.
Short target-site duplications can form when an insertion sequence enters a new DNA site. Their presence provides a molecular signature associated with the insertion process and helps distinguish the boundaries of the newly occupied region. Examining these repeated sequences can therefore support reconstruction of insertion events and clarify how mobile elements have contributed to bacterial genome organization.
Insertion near or within a gene can disrupt its coding sequence or alter transcription, the process that produces an RNA copy from DNA. Consequently, the impact may involve loss of gene function or a change in how strongly the gene is expressed. These effects allow insertion sequences to modify bacterial traits even when the surrounding chromosome remains largely intact.
Researchers can examine insertion locations, affected genes, transcriptional changes, chromosome rearrangements, and DNA neighboring the element. Considering these features together connects a local insertion event with broader changes in genome structure and phenotype. This analysis helps explain how bacterial genetic variation arises and how mobile DNA contributes to adaptation over time.
An insertion sequence can mobilize neighboring DNA, including determinants associated with antibiotic resistance. Movement can therefore affect more than the element’s own position by helping relocate nearby genetic information within or between bacterial genomes. Studying these relationships is important for understanding how resistance-related traits can become part of broader patterns of bacterial variation and adaptation.
These elements provide a way to investigate how bacterial genomes change through gene disruption, altered transcription, rearrangement, and movement of neighboring DNA. In microbiology, that perspective supports analysis of adaptation and trait spread. In biotechnology, understanding the same mechanisms is relevant when interpreting or managing genetic variation in bacterial systems, even when the desired outcome depends on controlled genome behavior.