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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...
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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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siRNA - Small Interfering RNAs02:30

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Small interfering RNAs, or siRNAs, are short regulatory RNA molecules that can silence genes post-transcriptionally, as well as the transcriptional level in some cases. siRNAs are important for protecting cells against viral infections and silencing transposable genetic elements.
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As the name suggests, non-LTR retrotransposons lack the long terminal repeats characteristic of the LTR retrotransposons. Additionally, both LTR and non-LTR retrotransposons use distinct mechanisms of mobilization. Non-LTR retrotransposons are further divided into two classes - Long interspersed nuclear elements (LINEs) and short interspersed nuclear elements (SINEs), both of which occur abundantly in most mammals, including humans. Some of the active non-LTR retrotransposons in humans are L1...
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Ribosome synthesis is a highly complex and coordinated process involving more than 200 assembly factors. The synthesis and processing of ribosomal components occurs not only in the nucleolus but also in the nucleoplasm and the cytoplasm of eukaryotic cells.
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PIWI-interacting RNAs, or piRNAs, are the most abundant short non-coding RNAs. More than 20,000 genes have been found in humans that code for piRNAs while only 2000 genes have been found for miRNAs. piRNAs can act at the transcriptional and post-transcriptional levels and have a vital role in silencing transposable elements present in germ cells. They are also involved in epigenetic silencing and activation. Previously, they were thought to function only in germ cells but new evidence suggests...
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Video Experimental Relacionado

Updated: Jun 7, 2025

Enhanced Northern Blot Detection of Small RNA Species in Drosophila Melanogaster
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ARN pequeños y largos no codificantes: pasado, presente y futuro

Ling-Ling Chen1, V Narry Kim2

  • 1Key Laboratory of RNA Science and Engineering, CAS Center for Excellence in Molecular Cell Science, Shanghai Institute of Biochemistry and Cell Biology, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, China; School of Life Science and Biotechnology, Shanghai Jiao Tong University, Shanghai 200240, China; School of Life Science and Technology, ShanghaiTech University, Shanghai 201210, China; New Cornerstone Science Laboratory, Shenzhen, China.

Cell
|November 15, 2024
PubMed
Resumen

Los ARN no codificantes reguladores (ARNnc), incluidos los ARN pequeños y los ARN largos no codificantes (ARNlnc), son vitales para la regulación génica. Esta revisión detalla su descubrimiento, mecanismos, funciones y roles en la enfermedad, destacando las direcciones de investigación futuras para los lncRNA.

Palabras clave:
ARN largos no codificantesmicroARN y sus derivadosBiogénesis del ncRNAEvolución del ncRNAFunción del ncRNAMecanismo del ncRNALos ncRNA en las enfermedadeslos ncRNA reguladores

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Área de la Ciencia:

  • Biología molecular
  • La genética
  • Biología del ARN

Sus antecedentes:

  • El dogma central de la biología molecular ha evolucionado con el descubrimiento de diversas especies de ARN.
  • Los ARN no codificantes (ARNnc) juegan un papel crítico en la regulación génica, complementando a los ARN mensajeros.
  • Los ncRNA reguladores, particularmente los ARN pequeños y los ARN largos no codificantes (lncRNA), han avanzado significativamente en la biología del ARN.

Objetivo del estudio:

  • Para revisar la comprensión actual de los ARN pequeños y los lncRNA, dos clases principales de los ncRNA reguladores.
  • Explorar el descubrimiento, la biogénesis, la evolución, los mecanismos, las funciones y las interacciones de estos ncRNA.
  • Resaltar las funciones fisiopatológicas de los ncRNA y proponer futuras vías de investigación para los lncRNA.

Principales métodos:

  • Revisión de la literatura y síntesis de las investigaciones existentes sobre ARN pequeños y ARN inc.
  • Análisis comparativo de las vías de ARN pequeño y los mecanismos de lncRNA.
  • Discusión de los aspectos evolutivos y las funciones funcionales de los ncRNA reguladores.

Principales resultados:

  • Las vías de ARN pequeñas están bien caracterizadas con mecanismos definidos.
  • Los lncRNA muestran una amplia diversidad de mecanismos, muchos de los cuales aún están bajo investigación.
  • Los ncRNA están involucrados en varios procesos celulares y condiciones fisiopatológicas.

Conclusiones:

  • Los ncRNA reguladores, especialmente los RNA pequeños y los lncRNA, son fundamentales para la regulación genética y la función celular.
  • Se necesita más investigación para dilucidar completamente los complejos mecanismos y funciones de los lncRNA.
  • La comprensión de la interconexión de ncRNA y su papel en la enfermedad ofrece objetivos terapéuticos prometedores.