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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...
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Design Example: Application of Archimedes' Principle01:11

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Archimedes' principle is fundamental in analyzing the buoyant force and stability of floating bodies. In this example, a wooden block with a rectangular section floats in seawater. Based on the block's dimensions, its specific gravity and the specific weight of seawater are used to find the volume of water displaced and the center of buoyancy.
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What is an Electrochemical Gradient?01:26

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Adenosine triphosphate, or ATP, is considered the primary energy source in cells. However, energy can also be stored in the electrochemical gradient of an ion across the plasma membrane, which is determined by two factors: its chemical and electrical gradients.
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The Aufbau Principle and Hund's Rule03:02

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To determine the electron configuration for any particular atom, we can build the structures in the order of atomic numbers. Beginning with hydrogen, and continuing across the periods of the periodic table, we add one proton at a time to the nucleus and one electron to the proper subshell until we have described the electron configurations of all the elements. This procedure is called the aufbau principle, from the German word aufbau (“to build up”). Each added electron occupies the...
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The Uncertainty Principle04:08

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Werner Heisenberg considered the limits of how accurately one can measure properties of an electron or other microscopic particles. He determined that there is a fundamental limit to how accurately one can measure both a particle’s position and its momentum simultaneously. The more accurate the measurement of the momentum of a particle is known, the less accurate the position at that time is known and vice versa. This is what is now called the Heisenberg uncertainty principle. He...
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Diploid organisms have two alleles of each gene, one from each parent, in their somatic cells. Therefore, each individual contributes two alleles to the gene pool of the population. The gene pool of a population is the sum of every allele of all genes within that population and has some degree of variation. Genetic variation is typically expressed as a relative frequency, which is the percentage of the total population that has a given allele, genotype or phenotype.
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Updated: Feb 12, 2026

Using Confocal Analysis of Xenopus laevis to Investigate Modulators of Wnt and Shh Morphogen Gradients
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La reconstitución del gradiente del morfogeno revela los principios de diseño de la vía del erizo

Pulin Li1, Joseph S Markson1, Sheng Wang1

  • 1Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA 91125, USA.

Science (New York, N.Y.)
|April 7, 2018
PubMed
Resumen
Este resumen es generado por máquina.

Las células utilizan gradientes morfogénicos para determinar su posición durante el desarrollo de los tejidos. El camino de Sonic Hedgehog

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Área de la Ciencia:

  • Biología del desarrollo
  • Señalización celular
  • Biología de sistemas

Sus antecedentes:

  • Las células en el desarrollo de los tejidos perciben la posición espacial utilizando gradientes morfógenos.
  • Las arquitecturas moleculares de las vías de detección de morfógenos y su impacto en la precisión del patrón no se comprenden bien.

Objetivo del estudio:

  • Analizar sistemáticamente las características arquitectónicas de la vía Sonic Hedgehog (SHH).
  • Comprender cómo los diferentes diseños de vías afectan la formación de gradientes morfógenos y la dinámica de patrones.

Principales métodos:

  • Reconstitución in vitro de gradientes morfógenos mediante ensayos basados en células.
  • El recableado genético de los componentes de la vía para crear arquitecturas alternativas.
  • Modelado matemático para analizar la dinámica y la robustez del gradiente.

Principales resultados:

  • La arquitectura de la vía SHH, con regulación doble negativa y retroalimentación negativa mediada por el receptor PTCH, acelera la formación de gradientes.
  • Esta arquitectura específica mejora la robustez frente a las variaciones en las tasas de producción de morfógenos en comparación con otros diseños.
  • El análisis comparativo de las arquitecturas recableadas reveló ideas sobre el control de patrones.

Conclusiones:

  • El diseño de la vía SHH optimiza la formación de gradientes y la robustez en el patrón de desarrollo.
  • El aislamiento y la comparación de arquitecturas de vías proporciona un método poderoso para la comprensión y la ingeniería de patrones multicelulares.
  • Este estudio ofrece un marco para diseccionar y potencialmente diseñar procesos de desarrollo basados en morfógenos.