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lncRNA - Long Non-coding RNAs02:39

lncRNA - Long Non-coding RNAs

In humans, more than 80% of the genome gets transcribed. However, only around 2% of the genome codes for proteins. The remaining part produces non-coding RNAs which includes ribosomal RNAs, transfer RNAs, telomerase RNAs, and regulatory RNAs, among other types. A large number of regulatory non-coding RNAs have been classified into two groups depending upon their length – small non-coding RNAs, such as microRNA, which are less than 200 nucleotides in length, and long non-coding RNA (lncRNA)...
lncRNA - Long Non-coding RNAs02:39

lncRNA - Long Non-coding RNAs

In humans, more than 80% of the genome gets transcribed. However, only around 2% of the genome codes for proteins. The remaining part produces non-coding RNAs which includes ribosomal RNAs, transfer RNAs, telomerase RNAs, and regulatory RNAs, among other types. A large number of regulatory non-coding RNAs have been classified into two groups depending upon their length – small non-coding RNAs, such as microRNA, which are less than 200 nucleotides in length, and long non-coding RNA (lncRNA)...
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Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
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Epigenetic changes alter the physical structure of the DNA without changing the genetic sequence and often regulate whether genes are turned on or off. This regulation ensures that each cell produces only proteins necessary for its function. For example, proteins that promote bone growth are not produced in muscle cells. Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
X-chromosome...
Epigenetic Regulation01:46

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Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
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Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in regulating gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
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Regulación epigenética por ARN largos no codificantes.

Jeannie T Lee1

  • 1Howard Hughes Medical Institute, Department of Molecular Biology, Massachusetts General Hospital, and Department of Genetics, Harvard Medical School, Boston, MA 02138, USA. lee@molbio.mgh.harvard.edu

Science (New York, N.Y.)
|December 15, 2012
PubMed
Resumen
Este resumen es generado por máquina.

Los genomas de los mamíferos son complejos, con muchas unidades de transcripción que producen ARN largos no codificantes (ARNlnc) que se superponen a los genes codificantes. Comprender las diversas funciones de estos lncRNAs es un desafío clave en la biología molecular.

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Área de la Ciencia:

  • La genómica es la genómica.
  • Biología Molecular Biología Molecular
  • ARN Biología Biología ARN

Sus antecedentes:

  • Investigaciones recientes revelan una transcripción generalizada y compleja en los genomas de mamíferos.
  • Numerosas unidades de transcripción, que producen principalmente ARN largos no codificantes (ARNlnc), se superponen con los genes codificantes tradicionales.
  • Los lncRNA abarcan diversos tipos, incluidos los transcritos antisense, intrónicos, intergénicos, los pseudogenes y los retrotransposones.

Objetivo del estudio:

  • Para explorar el significado funcional de la gran cantidad de lncRNAs.
  • Para investigar si los lncRNAs son moléculas funcionales o simplemente subproductos de la transcripción.
  • Proporcionar un vistazo al panorama emergente de las funciones y mecanismos del lncRNA.

Principales métodos:

  • Revisión de estudios recientes sobre la transcripción del genoma de mamíferos.
  • Análisis de los sistemas emergentes de ARN largo no codificante (ARNlnc).
  • Examen comparativo de las funciones y mecanismos del lncRNA.

Principales resultados:

  • La transcripción de los genomas de mamíferos es altamente compleja, con una gran superposición entre los lncRNA y los genes codificantes.
  • Las funciones y mecanismos de los lncRNAs representan un territorio diverso y en gran parte inexplorado.
  • Una porción significativa de las unidades de transcripción producen lncRNAs, lo que desafía la noción de que sean meros subproductos.

Conclusiones:

  • Los roles funcionales de los lncRNAs son variados y aún no se comprenden completamente.
  • La investigación adicional es crucial para dilucidar el paisaje del "Salvaje Oeste" de las funciones y mecanismos del lncRNA.
  • Comprender estas macromoléculas es un desafío clave para la futura investigación en biología molecular.