Video Experimental Relacionado
Updated: May 10, 2026

11:36
Creation of a Dense Transposon Insertion Library Using Bacterial Conjugation in Enterobacterial Strains Such As Escherichia Coli or Shigella flexneri
Published on: September 23, 2017
Resumen
La transposición del transposón Tn10 se basa en sus segmentos IS10, siendo IS10-Derecha la unidad funcional primaria. Sitios específicos en los extremos de Tn10 son cruciales para su regulación de transposición.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Genética La genética.
- Microbiología Microbiología.
Sus antecedentes:
- El transposón Tn10 es un elemento genético móvil de 9300 bp.
- Cuenta con 1400 bp de repeticiones invertidas en sus extremos, conocidas como secuencias similares a IS10.
Objetivo del estudio:
- Para identificar los determinantes genéticos, los sitios y las funciones requeridas para la transposición de Tn10.
- Investigar la equivalencia funcional y las funciones de los dos segmentos del IS10.
Principales métodos:
- Análisis de los mutantes de deleción y las variantes estructurales de Tn10.
- Análisis de complementación para evaluar las funciones trans-actuantes.
- Localización de los sitios esenciales de transposición.
Principales resultados:
- Ambos segmentos de IS10 contienen todos los determinantes genéticos necesarios para la transposición de Tn10.
- IS10-Derecha es totalmente funcional, mientras que IS10-Izquierda tiene una función limitada de forma independiente.
- Los sitios esenciales de transposición se encuentran dentro de los 70 bp más externos de cada extremo.
- Tn10 exhibe auto-modulación de la transposición, que afecta a la complementación de los mutantes.
Conclusiones:
- Los segmentos IS10 son esenciales para la transposición de Tn10, con funciones funcionales distintas.
- La regulación de transposición implica sitios finales específicos y mecanismos de auto-modulación.
- Comprender los mecanismos de Tn10 proporciona información sobre el comportamiento de los elementos genéticos móviles.
Videos de Conceptos Relacionados
Translesion DNA Polymerases
Translesion (TLS) polymerases rescue stalled DNA polymerases at sites of damaged bases by replacing the replicative polymerase and installing a nucleotide across the damaged site. Doing so, TLS allows additional time for the cell to repair the damage before resuming regular DNA replication.
TLS polymerases are found in all three domains of life - archaea, bacteria, and eukaryotes. Of the different classes of TLS polymerases, members of the Y family are fitted with specialized structures that...
TLS polymerases are found in all three domains of life - archaea, bacteria, and eukaryotes. Of the different classes of TLS polymerases, members of the Y family are fitted with specialized structures that...
Overview of Transposition and Recombination
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...
DNA-only Transposons
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.
The donor site from where the transposon is excised is either degraded or...
The donor site from where the transposon is excised is either degraded or...
LTR Retrotransposons
LTR retrotransposons are class I transposable elements with long terminal repeats flanking an internal coding region. These elements are less abundant in mammals compared to other class I transposable elements. About 8 percent of human genomic DNA comprises LTR retrotransposons. Some of the common examples of LTR retrotransposons are Ty elements in yeast and Copia elements in Drosophila.
The internal coding region of LTR retrotransposons and their mechanism of transposition closely resembles a...
The internal coding region of LTR retrotransposons and their mechanism of transposition closely resembles a...
Non-LTR Retrotransposons
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...
Transposons
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...

