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CRISPR01:59

CRISPR

Genome editing technologies allow scientists to modify an organism’s DNA via the addition, removal, or rearrangement of genetic material at specific genomic locations. These types of techniques could potentially be used to cure genetic disorders such as hemophilia and sickle cell anemia. One popular and widely used DNA-editing research tool that could lead to safe and effective cures for genetic disorders is the CRISPR-Cas9 system. CRISPR-Cas9 stands for Clustered Regularly Interspaced Short...
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...
CRISPR and crRNAs02:53

CRISPR and crRNAs

Bacteria and archaea are susceptible to viral infections just like eukaryotes; therefore, they have developed a unique adaptive immune system to protect themselves. Clustered regularly interspaced short palindromic repeats and CRISPR-associated proteins (CRISPR-Cas) are present in more than 45% of known bacteria and 90% of known archaea.
The CRISPR-Cas system stores a copy of foreign DNA in the host genome and uses it to identify the foreign DNA upon reinfection. CRISPR-Cas has three different...
CRISPR01:59

CRISPR

Genome editing technologies allow scientists to modify an organism’s DNA via the addition, removal, or rearrangement of genetic material at specific genomic locations. These types of techniques could potentially be used to cure genetic disorders such as hemophilia and sickle cell anemia. One popular and widely used DNA-editing research tool that could lead to safe and effective cures for genetic disorders is the CRISPR-Cas9 system. CRISPR-Cas9 stands for Clustered Regularly Interspaced Short...
The Antiviral System of Bacteria and Archaea: CRISPR01:23

The Antiviral System of Bacteria and Archaea: CRISPR

CRISPR stands for Clustered Regularly Interspaced Short Palindromic Repeats is a adaptive immune system found in bacteria and archaea that protects against viral infections. This system enables prokaryotic cells to identify, remember, and neutralize foreign genetic elements, primarily bacteriophages, by storing fragments of the invader’s DNA as a genetic memory.The CRISPR immune response begins during an initial infection. Cas (CRISPR-associated) proteins play a central role in this defense.
CRISPR/Cas9 Genome Editing01:28

CRISPR/Cas9 Genome Editing

The CRISPR-Cas system serves as a bacterial defense mechanism against invading genetic elements such as viruses and plasmids, forming the foundation for its adaptation as a powerful genome-editing tool. Originally discovered in prokaryotes, this system has been repurposed to revolutionize genetic engineering across a wide range of organisms, including plants, animals, and humans. The core component, Cas9, is an endonuclease derived from Streptococcus pyogenes, capable of introducing...

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Video Experimental Relacionado

Updated: Jun 30, 2026

Efficient Production and Identification of CRISPR/Cas9-generated Gene Knockouts in the Model System Danio rerio
11:27

Efficient Production and Identification of CRISPR/Cas9-generated Gene Knockouts in the Model System Danio rerio

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Mapeo sistemático de potenciadores y análisis funcional en el pez cebra con interferencia CRISPR optimizada

Jiulin Chan1,2, Zhichao Wu1,2, Mingli Liu1,2

  • 1Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources, Ministry of Education, Shanghai Ocean University, Shanghai 201306, China.

Nucleic acids research
|December 19, 2025
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores optimizaron la interferencia CRISPR (repeticiones palindrómicas cortas agrupadas e interespaciadas regularmente) en el pez cebra para estudiar la regulación génica. Este sistema identificó nuevos potenciadores que controlan el desarrollo de las aletas y las células sanguíneas, avanzando en la anotación de elementos cis-regulatorios.

Palabras clave:
pez cebraCRISPRpotenciadoresregulación génicadesarrolloanotación de elementos cis-regulatorios

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Área de la Ciencia:

  • Genómica
  • Biología del Desarrollo
  • Genética Molecular

Sus antecedentes:

  • Los elementos cis-regulatorios no codificantes, especialmente los potenciadores, son vitales para el control de la expresión génica.
  • Estudiar la función de los potenciadores in vivo utilizando la interferencia CRISPR (CRISPRi) ha sido un desafío en los modelos de pez cebra.

Objetivo del estudio:

  • Optimizar el sistema CRISPRi en el pez cebra para la supresión génica eficiente.
  • Anotar funcionalmente los potenciadores distales de los genes de la globina utilizando el sistema CRISPRi optimizado.
  • Desarrollar una plataforma integrada para la anotación de elementos cis-regulatorios en vertebrados.

Principales métodos:

  • Se optimizó el sistema CRISPRi ajustando las concentraciones de los componentes para una reducción génica eficiente.
  • Se aplicó CRISPRi para caracterizar funcionalmente los potenciadores distales de los genes de la globina.
  • Se utilizaron ensayos de Hi-C y modificación de histonas para mapear las interacciones potenciador-promotor (EP) a nivel de genoma.

Principales resultados:

  • Se identificaron potenciadores previamente no reportados con una fuerza regulatoria significativa, que impactan el desarrollo de las aletas y las células sanguíneas.
  • Se mapearon 434 interacciones potenciador-promotor, revelando nuevos bucles regulatorios.
  • Se validaron varios bucles EP nuevos, lo que demuestra la efectividad del enfoque integrado.

Conclusiones:

  • El sistema CRISPRi optimizado mejora los estudios funcionales de los potenciadores en el pez cebra.
  • El estudio proporciona una plataforma robusta que integra métodos computacionales y experimentales para la anotación de elementos cis-regulatorios.
  • Este trabajo avanza la comprensión de la regulación génica en el desarrollo y las enfermedades de los vertebrados.