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RNA Interference01:23

RNA Interference

RNA interference (RNAi) is a process in which a small non-coding RNA molecule blocks the post-transcriptional expression of a gene by binding to its messenger RNA (mRNA) and preventing the protein from being translated.
This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...
RNA Interference01:23

RNA Interference

RNA interference (RNAi) is a process in which a small non-coding RNA molecule blocks the post-transcriptional expression of a gene by binding to its messenger RNA (mRNA) and preventing the protein from being translated.
This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...
siRNA - Small Interfering RNAs02:30

siRNA - Small Interfering RNAs

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.
In the cytoplasm, siRNA is processed from a double-stranded RNA, which comes from either endogenous DNA transcription or exogenous sources like a virus. This double-stranded RNA is then cleaved by the ATP-dependent...
Experimental RNAi02:15

Experimental RNAi

RNA interference (RNAi) is a cellular mechanism that inhibits gene expression by suppressing its transcription or activating the RNA degradation process. The mechanism was discovered by Andrew Fire and Craig Mello in 1998 in plants. Today, it is observed in almost all eukaryotes, including protozoa, flies, nematodes, insects, parasites, and mammals. This precise cellular mechanism of gene silencing has been developed into a technique that provides an efficient way to identify and determine the...
Multipotency of Hematopoietic Stem Cells01:19

Multipotency of Hematopoietic Stem Cells

The hematopoietic stem cells or HSCs are multipotent, meaning they can differentiate and give rise to all blood and immune cells. HSCs are maintained in the quiescent stage until an external stimulus initiates their differentiation. The multipotent HSCs exist as two heterogeneous populations, long-term repopulating cells (LTRC) and short-term repopulating cells (STRC). The two HSC populations have different surface markers or receptors and are classified based on quiescence and long-term...
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The cells of the blastocyst inner cell mass only remain pluripotent for a short time. This state of pluripotency and self-renewal can be maintained in embryonic stem (ES) cell culture by adding specific chemicals or growth factors to ensure the cells can continue dividing and later differentiate into different cell types. In some cases, the cells are grown on a feeder layer of differentiated cells, which provides the growth factors and extracellular matrix components necessary for stem cell...

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Oct4GiP Reporter Assay to Study Genes that Regulate Mouse Embryonic Stem Cell Maintenance and Self-renewal
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Published on: May 30, 2012

La disección de la auto-renovación en las células madre con interferencia de ARN.

Natalia Ivanova1, Radu Dobrin, Rong Lu

  • 1Department of Molecular Biology, Princeton University, Princeton, New Jersey 08544, USA. nivanova@molbio.princeton.edu

Nature
|June 13, 2006
PubMed
Resumen

Identificamos genes clave que controlan la auto-renovación de las células madre embrionarias de ratón utilizando el cribado de pérdida de función. Cuatro de estos genes tienen nuevas funciones en el mantenimiento de la pluripotencia y la regulación del destino celular.

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Área de la Ciencia:

  • Biología del desarrollo Biología del desarrollo.
  • Biología de las células madre Biología de las células madre
  • Genética La genética.

Sus antecedentes:

  • La auto-renovación de las células madre embrionarias (CEM) es crucial para el desarrollo y la medicina regenerativa.
  • Comprender la regulación genética de la auto-renovación ESC es esencial para controlar el destino de las células.

Objetivo del estudio:

  • Identificar nuevos mecanismos genéticos que gobiernan la auto-renovación del ESC del ratón.
  • Investigar las funciones de los reguladores transcripcionales en el mantenimiento de la pluripotencia.

Principales métodos:

  • Se utilizó el cribado de pérdida de función del ARN de horquilla corta (shRNA) para regular a la baja los productos génicos.
  • Centrado en los reguladores de la transcripción con potenciales funciones de auto-renovación.
  • Agotamiento genético integrado con análisis dinámicos y globales de expresión génica.

Principales resultados:

  • Identificaron siete genes cuyo agotamiento impacta negativamente en la auto-renovación del ESC.
  • Descubrieron roles no reconocidos previamente en la auto-renovación de cuatro de estos genes.
  • Elucidación de las funciones biológicas específicas de los genes identificados en la regulación del destino celular.

Conclusiones:

  • Reveló una compleja red de reguladores genéticos que controlan la auto-renovación del ESC.
  • Destacó la importancia de los reguladores transcripcionales en el mantenimiento de la pluripotencia.
  • Proporcionó nuevos conocimientos sobre los mecanismos de determinación del destino celular en los CES.