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Ribosome Profiling

Ribosome Profiling

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...

Translational Regulation

Translational Regulation

Translational regulation in prokaryotes ensures efficient protein synthesis by controlling ribosome access to mRNA. This regulation is mediated by secondary RNA structures, including translational riboswitches, RNA thermometers, and small RNAs (sRNAs), which respond to intracellular and environmental signals to modulate gene expression.Translational RiboswitchesRiboswitches in the leader region of mRNAs can regulate translation by altering the accessibility of the Shine-Dalgarno (SD) sequence,...

Stringent Response in E. coli

Stringent Response in E. coli

Bacterial growth is closely tied to nutrient availability, with cells proliferating exponentially under favorable conditions and entering a stationary phase when resources become scarce. This transition is mediated by a regulatory mechanism known as the stringent response, which allows bacteria to adapt to nutrient deprivation by modulating gene expression and metabolic activity.During nutrient scarcity, intracellular amino acid levels decline. It results in the accumulation of uncharged tRNAs...

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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Base complementarity between the three base pairs of mRNA codon and the tRNA anticodon is not a failsafe mechanism. Inaccuracies can range from a single mismatch to no correct base pairing at all. The free energy difference between the correct and nearly correct base pairs can be as small as 3 kcal/ mol. With complementarity being the only proofreading step, the estimated error frequency would be one wrong amino acid in every 100 amino acids incorporated. However, error frequencies observed in...

Ribosomal RNA Synthesis

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Isolation of Ribosome Bound Nascent Polypeptides in vitro to Identify Translational Pause Sites Along mRNA

Isolation of Ribosome Bound Nascent Polypeptides in vitro to Identify Translational Pause Sites Along mRNA

Published on: July 6, 2012

Ribo-seq de una sola célula revela una pausa traslacional dependiente del ciclo celular

Michael VanInsberghe¹, Jeroen van den Berg², Amanda Andersson-Rolf²

¹Oncode Institute, Hubrecht Institute-KNAW (Royal Netherlands Academy of Arts and Sciences) and University Medical Center Utrecht, Utrecht, The Netherlands. m.vaninsberghe@hubrecht.eu.

|September 9, 2021

Resumen

Este resumen es generado por máquina.

Los investigadores desarrollaron un método sensible de perfiles de ribosomas de una sola célula. Esta técnica, integrada con el aprendizaje automático, logra la resolución del codón para estudiar la traducción y las variaciones de célula a célula.

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Área de la Ciencia:

Biología molecular
La genómica
Biología celular

Sus antecedentes:

La secuenciación de una sola célula avanza en el análisis del genoma, el epigenoma y el transcriptoma.
La medición de la traducción a nivel de una sola célula sigue siendo un desafío importante.
Los métodos de detección de proteínas existentes carecen de resolución de una sola célula para la traducción.

Objetivo del estudio:

Desarrollar un método altamente sensible para el perfil de ribosomas en células individuales.
Para lograr una resolución de codón único para el análisis de la traducción celular.
Investigar el papel de la traducción en la diversidad celular.

Principales métodos:

Se han mejorado los protocolos de perfiles de ribosomas para una mayor sensibilidad.
Integración con el aprendizaje automático para la resolución de un solo codón.
Validación en varios contextos celulares, incluidos los tipos celulares raros.

Principales resultados:

Limitación demostrada de aminoácidos que causa una pausa del ribosoma en codones específicos.
Se observó una pausa del ribosoma dependiente del ciclo celular.
Se detectó una pausa pronunciada del codón GAA durante la mitosis.
Aplicó la técnica a las células enteroendocrinas primarias raras.

Conclusiones:

La tecnología desarrollada permite un análisis sensible y de alta resolución de la traducción de una sola célula.
La pausa del ribosoma está vinculada a estados celulares específicos como el ciclo celular y la mitosis.
Este método es aplicable a poblaciones de células raras, abriendo nuevas vías de investigación.
Proporciona una herramienta fundamental para comprender las contribuciones traslacionales a la diversidad celular.