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¿Qué tan omnipresente es el envejecimiento en los vertebrados?
Steven N Austad1, Caleb E Finch2
1University of Alabama at Birmingham, Birmingham, AL, USA.
Science (New York, N.Y.)
|June 23, 2022
Resumen
Algunas especies de tortugas muestran signos mínimos de envejecimiento, desafiando las suposiciones comunes sobre la senescencia. Estos hallazgos sugieren procesos únicos de envejecimiento en ciertos reptiles de larga vida.
Área de la Ciencia:
- Gerontología
- Herpetología
- Biología evolutiva
Sus antecedentes:
- El envejecimiento, o senescencia, es un proceso biológico fundamental caracterizado por el declive funcional progresivo.
- Aunque es común en muchas especies, la velocidad y la presencia del envejecimiento pueden variar significativamente, particularmente en organismos de larga vida.
- Comprender las variaciones del envejecimiento entre especies proporciona información sobre las compensaciones evolutivas y los mecanismos biológicos.
Objetivo del estudio:
- Investigar la presencia y el grado de envejecimiento en especies seleccionadas de tortugas de larga vida.
- Para determinar si estas tortugas exhiben características típicamente asociadas con la senescencia.
- Explorar posibles factores biológicos que contribuyen a la longevidad y al envejecimiento retardado de los reptiles.
Principales métodos:
- Estudios longitudinales que hacen un seguimiento de múltiples marcadores de salud y fisiológicos durante períodos prolongados.
- Análisis comparativos de los cambios relacionados con la edad en diversas poblaciones de tortugas.
- Análisis de biomarcadores para evaluar los indicadores celulares y moleculares del envejecimiento.
Principales resultados:
- Se observó poca o ninguna evidencia de aumento del riesgo de mortalidad o de deterioro funcional con la edad en las poblaciones de tortugas estudiadas.
- Los marcadores fisiológicos y moleculares clave típicamente asociados con el envejecimiento se mantuvieron estables en diferentes grupos de edad.
- Algunas especies mostraron una senescencia insignificante, lo que indica una posible falta de envejecimiento biológico dentro del marco temporal del estudio.
Conclusiones:
- Ciertas especies de tortugas pueden poseer mecanismos biológicos que ralentizan o detienen significativamente el proceso de envejecimiento.
- Estos hallazgos desafían la universalidad de los patrones típicos de senescencia y resaltan la diversidad del envejecimiento en el reino animal.
- Se necesita más investigación para dilucidar las vías genéticas y fisiológicas específicas responsables de la senescencia insignificante en estos reptiles.
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