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Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.
Anatomy of the Eyeball01:20

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The eye is a spherical, hollow structure composed of three tissue layers. The outer layer — the fibrous tunic, comprises the sclera — a white structure — and the cornea, which is transparent. The sclera encompasses some of the ocular surface, most of which is not visible. However, the 'white of the eye' is distinctively visible in humans compared to other species. The cornea, a clear covering at the front of the eye, enables light penetration. The eye's middle layer, the vascular tunic,...
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Fotorrecepción no visual en el iris del pollo.

Daniel C Tu1, Matthew L Batten, Krzysztof Palczewski

  • 1Department of Ophthalmology and Visual Sciences, Washington University Medical School, St. Louis, MO 63110 USA.

Science (New York, N.Y.)
|October 2, 2004
PubMed
Resumen
Este resumen es generado por máquina.

Las iris de pollo se contraen a la luz utilizando una vía no visual. Este estudio revela que el criptocromo, no las opsinas, media esta respuesta a la luz en el ojo del pollito embrionario, lo que sugiere un papel conservado para los criptocromos en la visión de los vertebrados.

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Área de la Ciencia:

  • Oftalmología Oftalmología.
  • Biología Molecular Biología Molecular
  • Biología del desarrollo Biología del desarrollo.

Sus antecedentes:

  • El iris embrionario del pollo exhibe constricción inducida por la luz.
  • Las características de esta respuesta son inconsistentes con los típicos mecanismos de fototransducción visual.

Objetivo del estudio:

  • Para investigar el mecanismo de fotorrecepción subyacente a la constricción del iris inducida por la luz en pollos embrionarios.
  • Para determinar si los pigmentos de opsina o no opsina median esta respuesta.

Principales métodos:

  • Análisis del espectro de acción de la constricción del iris.
  • Evaluación de la respuesta de las pupilas a la exposición a luz saturante.
  • Efecto de la depleción de retinoides y los inhibidores de la fototransducción visual.
  • Impacto de la reducción de los genes de criptocromo y melanopsina en la fotosensibilidad.

Principales resultados:

  • La fotosensibilidad del iris alcanzó su punto máximo en luz de longitud de onda corta, alineándose con el espectro de absorción del criptocromo.
  • Las respuestas de las pupilas mostraron potenciación, no atenuación, después de la exposición a una luz intensa.
  • La fotosensibilidad fue independiente de los retinoides y las vías de fototransducción visual.
  • El knockdown del criptocromo redujo significativamente la fotosensibilidad del iris, mientras que el knockdown de la melanopsina no tuvo ningún efecto.

Conclusiones:

  • El iris de pollo embrionario utiliza un mecanismo de fotorrecepción no opsina para la constricción inducida por la luz.
  • El criptocromo parece ser el fotorreceptor primario que media esta respuesta.
  • Esto sugiere un papel conservado para los criptocromos en la percepción de luz ocular de los vertebrados más allá de la visión tradicional.