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DNA Replication02:40

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DNA replication involves the separation of the two strands of the double helix, with each strand serving as a template from which the new complementary strand is copied.  After replication, each double-stranded DNA includes one parental or “old” strand and one “new” strand. This is known as semiconservative replication. The resulting DNA molecules have the same sequence and are divided equally into the two daughter cells.
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The DNA Replication Fork01:02

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An organism’s genome needs to be duplicated in an efficient and error-free manner for its growth and survival. The replication fork is a Y-shaped active region where two strands of DNA are separated and replicated continuously. The coupling of DNA unzipping and complementary strand synthesis is a characteristic feature of a replication fork.   Organisms with small circular DNA, such as E. coli, often have a single origin of replication; therefore, they have only two replication...
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The cell cycle is a series of events leading to DNA duplication followed by the division of cell content to form two daughter cells. The cell cycle progresses in four stages—the cell increases in size (gap 1 or G1-phase), duplicates its DNA (synthesis or S-phase), prepares to divide (gap 2 or G2-phase), and divides (mitosis or M-phase).
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Video Experimental Relacionado

Updated: Feb 7, 2026

Visualization of DNA Replication in the Vertebrate Model System DT40 using the DNA Fiber Technique
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Multiestabilidad continuamente ajustable en redes de replicación de ADN

Rui Zhong1, Yanjie Fu1, Shubao Jiang1

  • 1Molecular Science and Biomedicine Laboratory (MBL), State Key Laboratory of Chemo and Biosensing, College of Chemistry and Chemical Engineering, Aptamer Engineering Center of Hunan Province, Hunan University, Changsha, Hunan, PR China.

Nature communications
|February 5, 2026
PubMed
Resumen
Este resumen es generado por máquina.

Este estudio presenta un marco novedoso basado en ADN para la multiestabilidad continuamente ajustable. Permite un control preciso de los sistemas moleculares, yendo más allá de los estados discretos a un espectro de posibilidades.

Palabras clave:
ADNmultiestabilidadredes de replicacióningeniería molecularmemoria molecularbiocatálisistranscripción de ARNquímica de sistemas

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Área de la Ciencia:

  • Bioquímica
  • Ingeniería Molecular
  • Química de Sistemas

Sus antecedentes:

  • Los sistemas multiesables convencionales se limitan a estados discretos debido a interacciones mediadas por señales.
  • Lograr un espectro continuo de estados estables en sistemas moleculares sigue siendo un desafío importante.

Objetivo del estudio:

  • Desarrollar un marco racional para la multiestabilidad continuamente ajustable.
  • Permitir un control preciso de los estados y funciones moleculares.

Principales métodos:

  • Utilización de la competencia mediada por reacciones de desplazamiento reversible entre módulos de polimerización/corte de ADN.
  • Aprovechamiento de la hidrólisis de dNTP para estabilizar estados a lo largo de un gradiente composicional continuo.
  • Diseño de ADN de cadena simple con estructuras y funciones específicas.

Principales resultados:

  • Se demostró un marco para lograr la multiestabilidad continuamente ajustable.
  • Se habilitaron transiciones de estado continuas y ortogonales y memoria molecular adaptativa a la concentración.
  • Se mostró el control aguas abajo de procesos como la biocatálisis y la transcripción de ARN.

Conclusiones:

  • El marco propuesto ofrece una sintonizabilidad sin precedentes para sistemas moleculares.
  • Establece una plataforma versátil para sistemas químicos y de materiales con multiestabilidad continuamente ajustable.
  • Abre nuevas vías para la programación y el control molecular avanzado.