Video Experimental Relacionado

Updated: Feb 24, 2026

Author Spotlight: FISH as a Tool for Precise Gene Amplification Assessment in Cancer Specimens

Author Spotlight: FISH as a Tool for Precise Gene Amplification Assessment in Cancer Specimens

Published on: July 12, 2024

Evolución de la amplificación de oncogenes en 86 000 genomas de células cancerosas

Jake June-Koo Lee, Sohrab Salehi, Matthew A Myers

bioRxiv : the preprint server for biology

|February 23, 2026

Resumen

Las amplificaciones de número de copias de alto nivel (HLAMP) en el cáncer surgen de distintas trayectorias evolutivas: amplificación intragenómica (ICamp) y ADN extracromosómico (ecDNA). Comprender estas trayectorias es clave para desarrollar terapias eficaces contra el cáncer.

Área de la Ciencia:

Genómica
Biología del Cáncer
Biología Evolutiva

Sus antecedentes:

La amplificación de número de copias de alto nivel (HLAMP) es un motor clave de la activación de oncogenes en cánceres humanos.
La focalización terapéutica de las HLAMP está avanzando, sin embargo, sus orígenes evolutivos y su impacto en la respuesta al tratamiento siguen siendo poco comprendidos.

Objetivo del estudio:

Investigar las trayectorias evolutivas de las HLAMP utilizando métodos computacionales novedosos.
Diferenciar los mecanismos y las distribuciones celulares de la amplificación intragenómica (ICamp) y el ADN extracromosómico (ecDNA).

Principales métodos:

Secuenciación del genoma completo de célula única de 86 239 células cancerosas de 94 pacientes y 8 sistemas experimentales.
Nuevos enfoques computacionales para analizar la dinámica evolutiva y las distribuciones del número de copias.
Análisis conjunto de la estructura de ecDNA, la abundancia celular y el contexto genómico.

Principales resultados:

ICamp y ecDNA exhiben distribuciones distintas de número de copias entre células, lo que refleja diferentes dinámicas evolutivas.
Los eventos de ICamp muestran especificidad subclon, evolucionando a través de la modulación asociada con expansiones clonales.
Los ecDNA muestran una mayor variación del número de copias de célula a célula debido a reordenamientos estructurales y arquitecturas complejas.
La evolución de ecDNA implica modos divergentes y convergentes influenciados por el daño del ADN, la selección y la reintegración.
La modelización de las distribuciones de ecDNA de célula única mejora las predicciones a granel y revela la especificidad del tipo de tejido.

Conclusiones:

Mecanismos evolutivos distintos subyacen a diferentes tipos de amplificación de oncogenes.
La evolución de ecDNA es compleja y está influenciada por múltiples factores, con implicaciones para las terapias dirigidas.
La prevalencia específica del tejido de ecDNA sugiere que pueden ser necesarias estrategias terapéuticas personalizadas.

Palabras clave:

amplificación de número de copias de alto nivel ADN extracromosómico amplificación intragenómica trayectorias evolutivas biología del cáncer genómica medicina de precisión

Más Videos Relacionados

Oncogene Expression Analysis with Alterations in pH in a Pancreatic Ductal Cell Line

Oncogene Expression Analysis with Alterations in pH in a Pancreatic Ductal Cell Line

Published on: April 11, 2025

Oncogenic Gene Fusion Detection Using Anchored Multiplex Polymerase Chain Reaction Followed by Next Generation Sequencing

Oncogenic Gene Fusion Detection Using Anchored Multiplex Polymerase Chain Reaction Followed by Next Generation Sequencing

Published on: July 5, 2019

Videos de Conceptos Relacionados

Cancers Originate from Somatic Mutations in a Single Cell

Cancers Originate from Somatic Mutations in a Single Cell

Cancer arises from mutations in the critical genes that allow healthy cells to escape cell cycle regulation and acquire the ability to proliferate indefinitely. Though originating from a single mutation event in one of the originator cells, cancer progresses when the mutant cell lines continue to gain more and more mutations, and finally, become malignant. For example, chronic myelogenous leukemia (CML) develops initially as a non-lethal increase in white blood cells, which progressively...

Cancer-Critical Genes I: Proto-oncogenes

Cancer-Critical Genes I: Proto-oncogenes

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...

Tumor Progression

Tumor Progression

Tumor progression is a phenomenon where the pre-formed tumor acquires successive mutations to become clinically more aggressive and malignant. In the 1950s, Foulds first described the stepwise progression of cancer cells through successive stages.
Colon cancer is one of the best-documented examples of tumor progression. Early mutation in the APC gene in colon cells causes a small growth on the colon wall called a polyp. With time, this polyp grows into a benign, pre-cancerous tumor. Further...

Adaptive Mechanisms in Cancer Cells

Adaptive Mechanisms in Cancer Cells

Cancer cells accumulate genetic changes at an abnormally rapid rate due to the defects in the DNA repair mechanisms. From an evolutionary perspective, such genetic instability is advantageous for cancer development. Mutant cell lines accumulate a series of beneficial mutations that contribute to their progression into cancer.
Some of the advantages that cancer cells have on normal cells include - enhanced ability to divide without terminally differentiating, induce new blood vessel formation,...

Cancer

Cancer

Cancers arise due to mutations in genes involved in the regulation of cell division, which leads to unrestricted cell proliferation. Modern science and medicine have made great strides in the understanding and treatment of cancer, including eradicating cancer in some patients. However, there is still no cure for cancer. This is largely due to the fact that cancer is a large group of many diseases.

Cancer-Critical Genes II: Tumor Suppressor Genes

Cancer-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...