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La transición a mitad de desarrollo y la evolución de los planes de cuerpo animal
Michal Levin1, Leon Anavy1, Alison G Cole1
1Department of Biology, Technion - Israel Institute of Technion, Haifa 32000, Israel.
Nature
|February 18, 2016
Resumen
Phyla, agrupaciones de animales basadas en planes corporales, pueden definirse objetivamente por la expresión génica conservada durante una transición de desarrollo medio. Esta transición vincula las fases tempranas y tardías de expresión génica, lo que potencialmente define los períodos filotípicos en diversas especies.
Área de la Ciencia:
- Biología del desarrollo
- Biología evolutiva
- La genómica
Sus antecedentes:
- Los phyla animales se definen tradicionalmente por diferentes planes de cuerpo.
- El período filotípico, una etapa de desarrollo conservada, existe dentro de algunos filos.
- Las definiciones actuales de los phyla carecen de criterios objetivos, lo que lleva a agrupaciones arbitrarias.
Objetivo del estudio:
- Investigar los criterios objetivos para la definición de los phyla animales.
- Explorar el papel de la expresión génica durante el desarrollo en la definición de filo.
- Para comparar los transcriptomas de desarrollo entre diversas especies animales.
Principales métodos:
- Análisis comparativo de transcriptomas de desarrollo de diez especies en diferentes filas.
- Identificación de patrones de expresión génica conservados y divergentes durante el desarrollo.
- Correlación de las transiciones de expresión génica con los períodos filotípicos conocidos.
Principales resultados:
- Las diez especies exhibieron una fase temprana y tardía conservada de expresión génica.
- Una "transición de desarrollo medio" divergente enlaza estas fases utilizando vías específicas de la especie.
- Esta transición se solapa con el período filotípico, lo que sugiere su papel en la formación del plano corporal.
Conclusiones:
- La transición a mitad de desarrollo es crucial para definir los planes de cuerpo filético.
- Esta transición puede servir para definir períodos filotípicos en otros filos.
- Un filo puede definirse por la expresión génica conservada pero distinta en la transición del desarrollo medio.
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