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Nucleic Acid Structure01:25

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The pentose sugar in DNA is deoxyribose, while in RNA the pentose sugar is ribose. The difference between the sugars is the presence of the hydroxyl group on the ribose's second carbon and a hydrogen on the deoxyribose's second carbon. The phosphate residue attaches to the hydroxyl group of the 5′ carbon of one sugar and the hydroxyl group of the 3′ carbon of the sugar of the next nucleotide, which forms  a 5′ to 3′ phosphodiester linkage.
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RNA Structure01:23

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The basic structure of RNA consists of a five-carbon sugar and one of four nitrogenous bases. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
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RNA Structure01:19

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The basic structure of RNA consists of a string of ribonucleotides attached by phosphodiester bonds. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
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The Nucleolus02:55

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The nucleolus is the most prominent substructure of the nucleus. When it was first discovered, it was considered to be an isolated organelle that forms fibrils and granules. In 1931, the relationship between the nucleolus and chromosomes was first described by Heitz. He observed that the appearance and size of nucleolus varies depending on the stage of the cell cycle. He also noticed constricted regions on different chromosomes clustered together at definite cell cycle stages. These regions,...
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Transcription is the process of synthesizing RNA from a DNA sequence by RNA polymerase. It is the first step in producing a protein from a gene sequence. Additionally, many other proteins and regulatory sequences are involved in the proper synthesis of messenger RNA (mRNA). Regulation of transcription is responsible for the differentiation of all the different types of cells and often for the proper cellular response to environmental signals.
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Transcription is the synthesis of RNA from a DNA sequence by RNA polymerase. It is the first step in producing a protein from a gene sequence. Additionally, many other proteins and regulatory sequences are involved in correctly synthesizing messenger RNA (mRNA). Transcriptional regulation is responsible for the differentiation of different types of cells and often for the proper cellular response to environmental signals.
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Nanostructuras de ARN de diseño cotranscritas y autoensambladas dentro de núcleos de células humanas

Xu Chang1, Maciej Jeziorek2, Qi Yang1

  • 1Department of Chemistry, Rutgers University, Newark, NJ, USA.

Nature communications
|December 26, 2025
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores desarrollaron nanostructuras de ARN autoensambladas para la entrega nuclear en células humanas. Estas redes de nanoestructuras codificadas genéticamente ofrecen geometría y localización programables para aplicaciones biológicas avanzadas.

Palabras clave:
ARNnanostructurasautoensamblajebiología sintéticaentrega nuclearcélulas humanasnanotecnología

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Área de la Ciencia:

  • Biología Sintética
  • Biología Molecular
  • Nanotecnología

Sus antecedentes:

  • La interacción y regulación de los procesos celulares mediante nanostructuras de ácidos nucleicos es un desafío.
  • La entrega y retención nuclear de nanostructuras sintéticas en células eucariotas son obstáculos importantes.

Objetivo del estudio:

  • Presentar una plataforma para nanostructuras de ARN autoensambladas y codificadas genéticamente.
  • Demostrar su producción cotranscripcional, ensamblaje nuclear e integración funcional dentro de células humanas vivas.

Principales métodos:

  • Plegamiento cotranscripcional de ARN de cadena simple en nanostructuras definidas (anillos, cintas, redes de nanoestructuras).
  • Validación in vitro mediante microscopía de fuerza atómica.
  • Integración funcional de aptámeros fluorescentes y capacidades de detección de ARN.
  • Demostración in vivo en células humanas vivas mediante microscopía confocal de células vivas y microscopía electrónica de transmisión.

Principales resultados:

  • Formación de nanostructuras de ARN con geometría programable (anillos, cintas, redes de nanoestructuras) validada in vitro.
  • Producción cotranscripcional y ensamblaje exitosos de redes de nanoestructuras de ARN dentro del núcleo de células humanas vivas.
  • Demostración de la retención de patrones de nanostructuras bien definidos en el núcleo.
  • Integración funcional de aptámeros y capacidades de detección dentro de las nanostructuras.

Conclusiones:

  • Establecimiento de un sistema de nanostructuras de ARN autoensambladas y codificadas genéticamente.
  • Demostración de la geometría programable y las capacidades de localización nuclear.
  • Proporcionó una base para nanodispositivos basados en ARN para estudiar propiedades biológicas en células y tejidos vivos.