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Videos de Conceptos Relacionados

Telomeres and Telomerase02:41

Telomeres and Telomerase

In eukaryotic DNA replication, a single-stranded DNA fragment remains at the end of a chromosome after the removal of the final primer. This section of DNA cannot be replicated in the same manner as the rest of the strand because there is no 3’ end to which the newly synthesized DNA can attach. This non-replicated fragment results in gradual loss of the chromosomal DNA during each cell duplication. Additionally, it can induce a DNA damage response by enzymes that recognize single-stranded DNA.
Maxam-Gilbert Sequencing01:05

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In the same year as the discovery of the Sanger sequencing method, another group of scientists, Allan Maxam and Walter Gilbert, demonstrated their chemical-cleavage method for DNA sequencing. The Maxam-Gilbert method relies on using different chemicals that can cleave the DNA sequence at specific sites, the separation of resulting DNA fragments of variable size using electrophoresis, and deciphering the DNA sequence from the resulting gel bands.
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Single-Strand DNA Binding Proteins01:03

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For successful DNA replication, the unwinding of double-stranded DNA must be accompanied by stabilization and protection of the separated single strands of the DNA. This crucial task is performed by single-strand DNA-binding (SSB) proteins. They bind to the DNA in a sequence-independent manner, which means that the nitrogenous bases of the DNA need not be present in a specific order for binding of SSB proteins to it. The binding of SSB proteins straightens single-stranded DNA (ssDNA) and makes...
Homologous Recombination02:31

Homologous Recombination

The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
DNA Helicases00:55

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Updated: Jun 25, 2026

A G-quadruplex DNA-affinity Approach for Purification of Enzymatically Active G4 Resolvase1
11:25

A G-quadruplex DNA-affinity Approach for Purification of Enzymatically Active G4 Resolvase1

Published on: March 18, 2017

La escisión específica de la secuencia del ADN telomérico humano por la formación de G-cuadruplex.

Yan Xu1, Yuta Suzuki, Tuomas Lönnberg

  • 1Research Center for Advanced Science and Technology, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8904, Japan. xuyan@mkomi.rcast.u-tokyo.ac.jp

Journal of the American Chemical Society
|February 13, 2009
PubMed
Resumen

Los investigadores desarrollaron un método novedoso para dirigirse al ADN telomérico humano utilizando la formación G-cuadruplex. Este enfoque permite la escisión de ADN específica de la secuencia, ofreciendo una nueva estrategia para el desarrollo de tratamientos contra el cáncer.

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Área de la Ciencia:

  • La bioquímica es la bioquímica.
  • Biología Molecular Biología Molecular
  • Genética La genética.

Sus antecedentes:

  • Los telómeros, tapas protectoras en los extremos de los cromosomas, son cruciales en la biología del cáncer.
  • La disfunción de los telómeros está implicada en la progresión del cáncer y el envejecimiento.
  • Dirigirse a los telómeros presenta una estrategia prometedora para las terapias contra el cáncer.

Objetivo del estudio:

  • Investigar un enfoque basado en la estructura para la escisión específica de la secuencia del ADN telomérico humano.
  • Para explorar el potencial de la formación de G-cuadruplex en los telómeros objetivo.
  • Para establecer una prueba de concepto para nuevos reactivos de orientación de telómeros.

Principales métodos:

  • Utilizando un oligonucleótido con un multifosfonato [DNA-EDTP.Ce(IV) ] en el extremo 5'.
  • Empleando la formación G-cuadruplex para enlazar el ADN telomérico humano.
  • Inducir rupturas de cadenas de ADN específicas de la secuencia a través del oligonucleótido diseñado.

Principales resultados:

  • El oligonucleótido [DNA-EDTP.Ce(IV) ] se une con éxito al ADN telomérico humano a través de la formación de G-cuadruplex.
  • Se logró la escisión específica de la secuencia del ADN telomérico humano.
  • Este estudio proporciona la primera evidencia para dirigirse al ADN telomérico humano a través de la formación de G-cuadruplex.

Conclusiones:

  • El método desarrollado demuestra una nueva estrategia para la escisión del ADN telomérico específico de la secuencia.
  • La formación de G-cuadruplex es un mecanismo viable para atacar el ADN telomérico.
  • Este trabajo sirve como base para el diseño de agentes avanzados de división de telómeros para la terapia del cáncer.