Video Experimental Relacionado
Updated: May 13, 2026
11:26
Isolation and Immortalization of Patient-derived Cell Lines from Muscle Biopsy for Disease Modeling
Published on: January 18, 2015
hEST2, el supuesto gen de la subunidad catalítica de la telomerasa humana, se regula al alza en las células tumorales
M Meyerson1, C M Counter, E N Eaton
1Whitehead Institute for Biomedical Research, Department of Biology, Massachusetts Institute of Technology, Cambridge 02142, USA.
Cell
|August 22, 1997
Resumen
Los investigadores identificaron el gen humano hEST2, que es crucial para la activación de la telomerasa. Este gen es este gen.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- Oncología Oncología.
- Genética La genética.
Sus antecedentes:
- La telomerasa es esencial para el mantenimiento de los telómeros, pero generalmente se reprime en las células somáticas humanas normales.
- La reactivación de la telomerasa es un sello distintivo del desarrollo del cáncer y la inmortalización celular.
- Comprender la regulación de la telomerasa es fundamental para la investigación del cáncer.
Objetivo del estudio:
- Identificar y caracterizar el gen humano responsable de la actividad de la telomerasa.
- Para investigar el papel de este gen en la inmortalización celular y la progresión tumoral.
Principales métodos:
- Clonado del gen humano hEST2 basado en la similitud de secuencia con las subunidades catalíticas conocidas de la telomerasa.
- Análisis de la expresión génica hEST2 en varios tejidos humanos, líneas celulares de cáncer y células cultivadas.
- Correlación de los niveles de expresión de hEST2 con la actividad de la telomerasa durante la inmortalización y diferenciación celular.
Principales resultados:
- El gen humano clonado, hEST2, muestra una similitud de secuencia significativa con las subunidades catalíticas de la telomerasa.
- hEST2 está altamente expresado en tumores primarios, líneas celulares cancerosas y tejidos telomerasa-positivos.
- La expresión de hEST2 es indetectable en células somáticas normales y tejidos telomerasa-negativos, y sus niveles se correlacionan con la activación de la telomerasa durante la inmortalización y la diferenciación.
Conclusiones:
- El gen hEST2 codifica un componente del complejo telomerasa humana.
- La inducción de la expresión del ARNm hEST2 es un evento clave requerido para la activación de la telomerasa en la inmortalización celular y la progresión tumoral.
- hEST2 representa un objetivo terapéutico potencial en el tratamiento del cáncer.
Más Videos Relacionados
Videos de Conceptos Relacionados
02:41Telomeres and Telomerase
In eukaryotic DNA replication, a single-stranded DNA fragment remains at the end of a chromosome after the removal of the final primer. This section of DNA cannot be replicated in the same manner as the rest of the strand because there is no 3’ end to which the newly synthesized DNA can attach. This non-replicated fragment results in gradual loss of the chromosomal DNA during each cell duplication. Additionally, it can induce a DNA damage response by enzymes that recognize single-stranded DNA.
02:15Replicative Cell Senescence
Replicative cell senescence is a property of cells that allows them to divide a finite number of times throughout the organism's lifespan while preventing excessive proliferation. Replicative senescence is associated with the gradual loss of the telomere — short, repetitive DNA sequences found at the end of the chromosomes. Telomeres are bound by a group of proteins to form a protective cap on the ends of chromosomes. Embryonic stem cells express telomerase — an enzyme that adds the telomeric...
02:23Abnormal Proliferation
Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the daughter...
03:03mTOR Signaling and Cancer Progression
The mammalian target of rapamycin or mTOR protein was discovered in 1994 due to its direct interaction with rapamycin. The protein gets its name from a yeast homolog called TOR. The mTOR protein complex in mammalian cells plays a major role in balancing anabolic processes such as the synthesis of proteins, lipids, and nucleotides and catabolic processes, such as autophagy in response to environmental cues, such as availability of nutrients and growth factors.
The mTOR pathway or the...
The mTOR pathway or the...
01:05Cancer-Critical Genes II: Tumor Suppressor Genes
Genes usually encode proteins necessary for the proper functioning of a healthy cell. Mutations can often cause changes to the gene expression pattern, thereby altering the phenotype.
When the function of certain critical genes, especially those involved in cell cycle regulation and cell growth signaling cascades, gets disrupted, it upsets the cell cycle progression. Such cells with unchecked cell cycles start proliferating uncontrollably and eventually develop into tumors.
Such genes that act...
When the function of certain critical genes, especially those involved in cell cycle regulation and cell growth signaling cascades, gets disrupted, it upsets the cell cycle progression. Such cells with unchecked cell cycles start proliferating uncontrollably and eventually develop into tumors.
Such genes that act...
02:41Telomeres and Telomerase
In eukaryotic DNA replication, a single-stranded DNA fragment remains at the end of a chromosome after the removal of the final primer. This section of DNA cannot be replicated in the same manner as the rest of the strand because there is no 3’ end to which the newly synthesized DNA can attach. This non-replicated fragment results in gradual loss of the chromosomal DNA during each cell duplication. Additionally, it can induce a DNA damage response by enzymes that recognize single-stranded DNA.