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A Whole Mount In Situ Hybridization Method for the Gastropod Mollusc Lymnaea stagnalis
Published on: March 15, 2016
La filogenómica revela las profundas relaciones de los moluscos.
Kevin M Kocot1, Johanna T Cannon, Christiane Todt
1Department of Biological Sciences, Auburn University, 101 Rouse Life Sciences, Auburn, Alabama 36849, USA. kmkocot@auburn.edu
Nature
|September 6, 2011
Resumen
La historia evolutiva de los moluscos se aclara utilizando datos filogenómicos, revelando que los chitones y los moluscos parecidos a gusanos forman un clado. Este estudio también propone una nueva clasificación, Pleistomollusca, para los gasterópodos y bivalvos.
Área de la Ciencia:
- * Zoología Zoología.
- * Biología Evolutiva.
- * La filogenética.
Sus antecedentes:
- * Las relaciones evolutivas entre los ocho principales linajes de moluscos permanecen en gran parte sin resolver.
- * Estudios filogenéticos previos utilizando genes ribosómicos nucleares o morfología no han podido establecer relaciones sólidas.
- * Los limitados recursos genómicos han obstaculizado la aplicación de enfoques filogenómicos en la investigación de moluscos.
Objetivo del estudio:
- * Para resolver las profundas relaciones evolutivas dentro del filo Mollusca.
- * Utilizar datos transcriptómicos y genómicos para reconstruir una filogenia de moluscos bien apoyada.
- * Investigar la evolución de los caracteres morfológicos clave a la luz del nuevo marco filogenético.
Principales métodos:
- * Análisis filogenómico utilizando datos de transcriptoma y genoma de los principales linajes de moluscos (excepto Monoplacophora).
- * Análisis comparativo de caracteres morfológicos basados en las relaciones evolutivas recuperadas.
Principales resultados:
- * Se recuperó una topología filogenética bien apoyada para Mollusca.
- * Fuerte apoyo para la hipótesis Aculifera, agrupando Polyplacophora (quitos) con un Aplacophora monofilético.
- * Se identificó una relación de taxón hermano entre Gastropoda y Bivalvia, lo que llevó a la propuesta del nuevo clado Pleistomollusca.
Conclusiones:
- * El estudio proporciona una filogenia robusta para los moluscos, resolviendo preguntas evolutivas de larga data.
- * Los hallazgos apoyan el clado Aculifera y establecen Pleistomollusca (Gastropoda + Bivalvia) como un linaje principal.
- * La evidencia sugiere que la cefalización avanzada y el desarrollo de la concha pueden haber evolucionado de forma independiente varias veces dentro de los moluscos.
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