Video Experimental Relacionado
Updated: Jul 13, 2026
06:46
Mouse Fetal Whole Intestine Culture System for Ex Vivo Manipulation of Signaling Pathways and Three-dimensional Live Imaging of Villus Development
Published on: September 4, 2014
Bases moleculares del fenotipo del ratoncito y sus implicaciones para el crecimiento específico del tipo de célula
1Howard Hughes Medical Institute, School of Medicine, University of California, San Diego, La Jolla 92093-0648.
Nature
|July 15, 1993
Resumen
Una mutación en el receptor del factor de liberación de la hormona del crecimiento causa el fenotipo del ratón pequeño, lo que lleva a una pequeña glándula pituitaria. Este estudio revela distintas zonas de crecimiento celular en la pituitaria, reguladas secuencialmente por diferentes factores.
Área de la Ciencia:
- Endocrinología y Biología Molecular.
- Desarrollo y fisiología de los mamíferos.
Sus antecedentes:
- El ratón "pequeño" (iluminado) exhibe una glándula pituitaria anterior hipoplástica.
- Estudios previos vincularon el fenotipo lit a una mutación en el receptor del factor de liberación de la hormona del crecimiento (GHRHR).
Objetivo del estudio:
- Para dilucidar la base molecular del fenotipo de ratón encendido.
- Para analizar la estructura celular y la dinámica de proliferación de la hipófisis anterior del ratón encendido.
- Identificar los mecanismos reguladores que rigen el desarrollo de las células pituitarias.
Principales métodos:
- Análisis genético para identificar la mutación específica en el GHRHR.
- Examen histológico del tejido pituitario anterior de ratones encendidos y de tipo salvaje.
- Inmunohistoquímica para identificar tipos específicos de células y marcadores proliferativos.
Principales resultados:
- Una mutación de un solo nucleótido altera el ácido aspártico 60 a glicina en el GHRHR, causando el fenotipo encendido.
- La hipófisis anterior del ratón encendido muestra zonas proliferativas espacialmente distintas.
- Las células madre productoras de la hormona del crecimiento y los somatotróficos maduros están regulados por diferentes factores tróficos de manera secuencial.
Conclusiones:
- La mutación GHRHR es la causa directa de la hipoplasia de la hipófisis anterior en ratones encendidos.
- El desarrollo hipofisario implica zonas proliferativas distintas y reguladas secuencialmente para linajes celulares específicos.
- Esta estrategia de desarrollo puede conservarse a través de la organogénesis de mamíferos.
Videos de Conceptos Relacionados
02:41Lethal Alleles
Agouti: A Lethal Allele
Lucien Cuénot discovered lethal alleles in 1905 while studying the inheritance of coat color in mice. The agouti gene is responsible for the color of the coat in mice. This gene codes for an agouti-signaling protein, which is responsible for melanin distribution in mammals. The wild-type allele gives rise to gray-brown coat color in mice, while the mutant allele gives rise to yellow coat color. In addition to coat color, the agouti gene is associated with the yellow...
Lucien Cuénot discovered lethal alleles in 1905 while studying the inheritance of coat color in mice. The agouti gene is responsible for the color of the coat in mice. This gene codes for an agouti-signaling protein, which is responsible for melanin distribution in mammals. The wild-type allele gives rise to gray-brown coat color in mice, while the mutant allele gives rise to yellow coat color. In addition to coat color, the agouti gene is associated with the yellow...
02:33Hedgehog Signaling Pathway
The Hedgehog gene (Hh) was first discovered due to its control of the growth of disorganized, hair-like bristles phenotype in Drosophila, much like hedgehog spines. Hh plays a crucial role in the development of organs and the maintenance of homeostasis in both invertebrates and vertebrates. However, while Drosophila has only one Hh protein, mammals have multiple functional Hedgehog proteins - Sonic (Shh), Desert (Dhh), and Indian Hedgehog (Ihh). All of these homologous proteins have adapted to...
02:36Cells Coordinate Growth and Proliferation
Cell size is a significant factor impacting cellular design, function, and fitness. There exists some internal coordination by which cells double their masses before division, thus, achieving homeostasis. Coordination between cell growth and proliferation depends on the checkpoints in between cell cycle phases. Loss of coordination or failure in the checkpoint mechanism can drive the cell to uncontrolled growth and loss of cellular function. Like dividing cells that coordinate cellular growth,...
02:43Mouse Models of Cancer Study
Mice have long served as models for studying human biology and pathology because of their phylogenetic and physiological similarity with humans. They are also easy to maintain and breed in the laboratory, and hence, many inbred strains are now available for research. Studies on mice have contributed immeasurably to our understanding of cancer biology.
The development of transgenic, knockout, and knock-in mice has led to an exponential increase in their use as model organisms in research,...
The development of transgenic, knockout, and knock-in mice has led to an exponential increase in their use as model organisms in research,...