Video Experimental Relacionado
Updated: May 5, 2026

04:43
Chronic Implantation of Whole-cortical Electrocorticographic Array in the Common Marmoset
Published on: February 1, 2019
10.1K
ARHGAP11B específico para humanos aumenta el tamaño y el plegamiento del neocórtex de primates en el marmota fetal
Michael Heide1, Christiane Haffner2, Ayako Murayama3,4
1Max Planck Institute of Molecular Cell Biology and Genetics, 01307 Dresden, Germany. heide@mpi-cbg.de huttner@mpi-cbg.de.
Resumen
El gen específico humano ARHGAP11B impulsa la expansión neocortical en las marmotas. Este gen aumenta las células progenitoras, las neuronas y el tamaño del cerebro, reflejando el desarrollo neocortical humano.
Área de la Ciencia:
- Biología evolutiva
- Neurociencia del desarrollo
- La genética
Sus antecedentes:
- El neocórtex, crucial para las funciones cognitivas superiores, se ha expandido significativamente durante la evolución de los mamíferos.
- El gen específico humano ARHGAP11B ha estado implicado en la expansión neocortical del ratón y el hurón, pero su papel en la evolución de los primates no estaba claro.
Objetivo del estudio:
- Investigar el papel funcional del gen específico humano ARHGAP11B en el desarrollo y la evolución neocortical de los primates.
Principales métodos:
- Sobreexpresión de ARHGAP11B en el neocórtex fetal de la marmota común utilizando su propio promotor humano.
- Análisis del número de células progenitoras, producción neuronal, tamaño neocortical y patrones de plegamiento.
Principales resultados:
- La expresión de ARHGAP11B aumentó los progenitores de la glia radial basal en la zona subventricular externa.
- Se observó un aumento en las neuronas de la capa superior, lo que lleva al agrandamiento y plegamiento neocortical.
- Demostró que ARHGAP11B impulsa cambios en el desarrollo que reflejan la evolución neocortical humana en un primate no humano.
Conclusiones:
- El gen específico humano ARHGAP11B es un impulsor clave de la expansión neocortical de los primates.
- ARHGAP11B influye en la proliferación progenitora y la producción neuronal, contribuyendo al aumento del tamaño y la complejidad del cerebro.
- Los hallazgos proporcionan evidencia funcional del papel de ARHGAP11B en la expansión evolutiva del neocórtex de los primates.
Videos de Conceptos Relacionados
Pleiotropy
31.2K
Pleiotropy is the phenomenon in which a single gene impacts multiple, seemingly unrelated phenotypic traits. For example, defects in the SOX10 gene cause Waardenburg Syndrome Type 4, or WS4, which can cause defects in pigmentation, hearing impairments, and an absence of intestinal contractions necessary for elimination. This diversity of phenotypes results from the expression pattern of SOX10 in early embryonic and fetal development. SOX10 is found in neural crest cells that form melanocytes,...
31.2K
Alternative RNA Splicing
20.5K
Alternative RNA splicing is the regulated splicing of exons and introns to produce different mature mRNAs from a single pre-mRNA. Unlike in constitutive splicing where a single gene produces a single type of mRNA, alternative splicing allows an organism to produce multiple proteins from a single gene and plays an important role in protein diversity.
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
20.5K
Mechanism of Lamellipodia Formation
3.1K
Cells migrating in response to external stimuli form lamellipodia, which are thin membrane protrusions supported by a mesh of linked, branched, or unbranched actin filaments. These actin filaments interact with myosin motor proteins, creating the dynamic actomyosin complex within the cytoskeleton. Contractility, or the ability to generate contractile stress, is inherent to the actomyosin complex. It helps cells detect the stiffness of the surrounding ECM and exert contractile force for...
3.1K
Cellular Adaptation III: Hyperplasia
55
Hyperplasia is an increase in the number of cells in a tissue or organ due to enhanced cell division. It is an adaptive, controlled response to stimuli such as injury, hormones, or stress, involving mitosis to produce genetically identical cells and support tissue repair and regeneration.Tissue CapacityCertain tissues, including the epidermis, intestinal epithelium, bone marrow, and fibroblasts, have a high potential for hyperplasia. Others, such as bone, cartilage, and smooth muscle, show...
55

