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Monitoring Cell-autonomous Circadian Clock Rhythms of Gene Expression Using Luciferase Bioluminescence Reporters
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Extensa y divergente expresión génica circadiana en el hígado y el corazón
Kai-Florian Storch1, Ovidiu Lipan, Igor Leykin
1Department of Neurobiology, Harvard Medical School, Northeastern University, Boston, Massachusetts 02115, USA.
Nature
|April 23, 2002
Resumen
Los tejidos periféricos de los mamíferos exhiben una extensa regulación genética circadiana, con ritmos diarios distintos en el hígado y el corazón. Pocos genes están regulados en ambos, lo que indica vías especializadas a pesar de las funciones superpuestas.
Área de la Ciencia:
- * Cronobiología * Cronobiología
- * Biología molecular.
- * Fisiología * Fisiología.
Sus antecedentes:
- * Los relojes circadianos son osciladores endógenos que regulan los procesos fisiológicos diarios en los tejidos periféricos de los mamíferos.
- * El alcance y la especificidad de la regulación genética circadiana en diferentes tejidos siguen siendo en gran medida desconocidos.
- * La comprensión de las vías circadianas específicas de los tejidos es crucial para descifrar los mecanismos de sincronización fisiológica.
Objetivo del estudio:
- * Para analizar comparativamente la expresión génica circadiana in vivo en el hígado y el corazón de ratones.
- * Para determinar el grado de regulación circadiana de los genes en estos tejidos periféricos.
- * Investigar la superposición y divergencia de las vías circadianas entre los tejidos.
Principales métodos:
- * Se utilizaron matrices de oligonucleótidos que representan 12.488 genes para el análisis de la expresión génica.
- * Se realizó un análisis comparativo de la expresión génica circadiana en el hígado y el corazón de ratones.
- * Se estudiaron patrones de expresión génica in vivo para identificar genes rítmicos.
Principales resultados:
- * Se observó una extensa regulación genética circadiana, que afecta al 8-10% de los genes expresados en cada tejido.
- * Se encontraron distribuciones marcadamente diferentes de las fases circadianas entre el hígado y el corazón.
- * Muy pocos genes (superposición mínima) exhibieron regulación circadiana en ambos tejidos, independientemente de la expresión génica específica del tejido.
Conclusiones:
- * La regulación genética circadiana periférica es extensa pero altamente específica del tejido.
- * La regulación circadiana divergente en el hígado y el corazón implica la superposición de diversos procesos biológicos.
- * Un conjunto central de 37 genes sugiere nuevos genes potenciales de reloj y de salida, incluidos los que responden a los factores circulantes.
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