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Videos de Conceptos Relacionados

Leaky Scanning02:28

Leaky Scanning

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During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA.  Marilyn Kozak discovered that the sequence RCCAUGG (where R...
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pre-mRNA Processing02:01

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In eukaryotic cells, transcripts made by RNA polymerase are modified and processed before exiting the nucleus. Unprocessed RNA is called precursor mRNA or pre-mRNA to distinguish it from mature mRNA.
Once about 20-40 ribonucleotides have been joined together by RNA polymerase, a group of enzymes adds a “cap” to the 5’ end of the growing transcript. In this process, a 5’ phosphate is replaced by modified guanosine that has a methyl group attached to it (7-Methyl...
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Regulated mRNA Transport02:22

Regulated mRNA Transport

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In eukaryotes, transcription and translation are compartmentalized; an mRNA is first synthesized in the nucleus and then selectively transported to the cytoplasm for protein synthesis. Before transport, a pre-mRNA undergoes several steps of post-transcriptional modifications including splicing, 5' capping, and the addition of a poly-adenine tail. Various proteins bind to the pre-mRNA during these modifications. The mRNA transport takes place with the help of multiple proteins playing...
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Ribosome Profiling02:24

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Ribosome profiling or ribo-sequencing is a deep sequencing technique that produces a snapshot of active translation in a cell. It selectively sequences the mRNAs protected by ribosomes to get an insight into a cell’s translation landscape at any given point in time.
Applications of ribosome profiling
Ribosome profiling has many applications, including in vivo monitoring of translation inside a particular organ or tissue type and quantifying new protein synthesis levels.
The technique...
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Pre-mRNA Processing: Modification of pre-mRNA Ends01:35

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In eukaryotic cells, transcripts made by RNA polymerase are modified and processed before exiting the nucleus. Unprocessed RNA is called precursor mRNA or pre-mRNA to distinguish it from mature mRNA.
Once about 20-40 ribonucleotides have been joined together by RNA polymerase, a group of enzymes adds a cap to the 5' end of the growing transcript. In this process, a 5' phosphate is replaced by modified guanosine that has a methyl group attached (7-methyl guanosine). This 5' cap helps...
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Translation01:31

Translation

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Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
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Video Experimental Relacionado

Updated: Feb 22, 2026

Discrimintion and Mapping of the Primary and Processed Transcripts in Maize Mitochondrion Using a Circular RT-PCR-based Strategy
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Discrimintion and Mapping of the Primary and Processed Transcripts in Maize Mitochondrion Using a Circular RT-PCR-based Strategy

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Maíz Otro desarrollo involucra marcos de lectura abiertos traducidos de 3' regiones no traducidas.

Chunyu Wang1,2, Yuechao Wu3, Shunxi Wang4

  • 1State Key Laboratory of Forage Breeding-by-Design and Utilization, Institute of Botany, Chinese Academy of Sciences, Beijing, China.

Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|February 20, 2026
PubMed
Resumen
Este resumen es generado por máquina.

Las anteras de maíz tienen nuevos péptidos de regiones 3' no traducidas (3' UTRs) que pueden causar esterilidad masculina. Esta investigación también encontró que las anteras realizan la fotosíntesis de manera diferente a lo esperado.

Palabras clave:
3′ región no traducida.otro más, otro más.otro desarrollo de desarrollo.El maíz es maíz.La fotosíntesis es la fotosíntesis.reglamentación de traducción.

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Área de la Ciencia:

  • Biología molecular vegetal Biología molecular vegetal
  • Genética del maíz.
  • Fisiología vegetal Fisiología vegetal

Sus antecedentes:

  • Existen investigaciones limitadas sobre péptidos de marcos de lectura abiertos (ORF) en regiones no codificantes, especialmente regiones 3' no traducidas (3' UTR).
  • Mientras que las ORF de 5' pueden inhibir la traducción de ORF principal, la función de las ORF de 3' es en gran medida desconocida.
  • Comprender estos elementos es crucial para el desarrollo y la función del maíz.

Objetivo del estudio:

  • Investigar la regulación traslacional y las funciones peptídicas codificadas por 5' y 3' ORF en anteras de maíz en diez etapas de desarrollo.
  • Para explorar el vínculo potencial entre los 3' ORF y la esterilidad masculina del maíz.
  • Para analizar la actividad fotosintética dentro de las anteras de maíz.

Principales métodos:

  • Análisis de la regulación traslacional a través de diez etapas de desarrollo de las anteras de maíz.
  • Identificación y caracterización de péptidos traducidos de 5' y 3' ORFs.
  • Perfiles de traducción de todo el genoma.
  • Mediciones fisiológicas de las tasas de fotosíntesis y el transporte de electrones.

Principales resultados:

  • Los péptidos traducidos de 5' o 3' ORF pueden ser identificados erróneamente como isoformas.
  • 3' ORFs están potencialmente vinculados a otra esterilidad, ejemplificado por el APV1 locus.
  • Los genes relacionados con la fotosíntesis se enriquecen durante la etapa de microspora binucleada.
  • Las anteras de maíz exhiben una asimilación de CO2 con una eficiencia fotosintética limitada a través de una vía no C4.

Conclusiones:

  • 3' ORFs representan objetivos potenciales para el desarrollo de líneas de maíz masculino estéril.
  • Este estudio proporciona nuevos conocimientos sobre la actividad fotosintética única de las anteras de maíz.
  • Se justifica una mayor investigación sobre la traducción de regiones no codificadas para comprender el desarrollo de las plantas.