Video Experimental Relacionado
Updated: May 9, 2026
07:49
Creating and Applying a Reference to Facilitate the Discussion and Classification of Proteins in a Diverse Group
Published on: August 16, 2017
Las relaciones de artrópodos reveladas por el análisis filogenómico de secuencias de codificación de proteínas
Jerome C Regier1, Jeffrey W Shultz, Andreas Zwick
1Center for Biosystems Research, University of Maryland Biotechnology Institute, College Park, Maryland 20742, USA.
Nature
|February 12, 2010
Resumen
Este estudio resuelve la filogenia de los artrópodos utilizando extensos datos de ADN, confirmando que los insectos (Hexapoda) y los crustáceos están estrechamente relacionados dentro de Pancrustacea. También establece un árbol evolutivo robusto para el filo animal más grande, poniendo fin a debates de larga data.
Área de la Ciencia:
- Zoología Zoología Zoología.
- Biología evolutiva Biología evolutiva.
- La filogenética es la filogenética.
Sus antecedentes:
- La filogenia de los artrópodos ha sido difícil de resolver debido a los resultados mixtos de la filogenética molecular.
- Los análisis anteriores a menudo usaban taxones y genes limitados, lo que llevaba a hallazgos inconsistentes y débilmente respaldados.
- Comprender la historia evolutiva de los artrópodos es crucial dada su antigüedad, diversidad y importancia ecológica.
Objetivo del estudio:
- Establecer un marco filogenético estadísticamente bien respaldado para el filo Arthropoda.
- Para resolver debates de larga data con respecto a las relaciones evolutivas entre los principales grupos de artrópodos.
- Investigar la monofilia de los 'crustáceos' y su relación con los insectos.
Principales métodos:
- Análisis filogenéticos utilizando métodos de probabilidad, bayesianos y de parsimonia.
- Análisis de más de 41 kilobases de secuencia de ADN alineada de 62 genes codificadores de proteínas nucleares de una sola copia.
- Inclusión de 75 especies de artrópodos que representan todos los linajes principales, con grupos externos de tardígrados y onicóforos.
Principales resultados:
- Fuerte apoyo para los Pancrustacea (Hexapoda más Crustacea) y Mandibulata (Myriapoda más Pancrustacea).
- Identificación de los tres principales linajes de crustáceos existentes: Oligostraca, Vericrustacea y Xenocarida.
- Xenocarida identificado como el grupo hermano de Hexapoda, lo que indica que los "crustáceos" no son un grupo monofilético.
Conclusiones:
- El estudio proporciona un marco filogenético robusto para la evolución de los artrópodos.
- Los hallazgos resuelven aspectos clave de las relaciones entre artrópodos, incluida la ubicación de insectos y crustáceos.
- Esta investigación contribuye a resolver el prolongado debate sobre la historia evolutiva de los artrópodos.
Videos de Conceptos Relacionados
01:23Phylogeny
Phylogeny is concerned with the evolutionary diversification of organisms or groups of organisms. A group of organisms with a name is called a taxon (singular). Taxa (plural) can span different levels of the evolutionary hierarchy. For instance, the group containing all birds is a taxon (comprising the class Aves), and the group of all species of daisies (the genus Bellis) is a taxon. Phylogenies can likewise include just one genus (i.e., depict species relationships) or span an entire kingdom.
03:21Phylogenetic Trees
Phylogenetic trees come in many forms. It matters in which sequence the organisms are arranged from the bottom to the top of the tree, but the branches can rotate at their nodes without altering the information. The lines connecting individual nodes can be straight, angled, or even curved.
02:05Gene Evolution - Fast or Slow?
The genomes of eukaryotes are punctuated by long stretches of sequence which do not code for proteins or RNAs. Although some of these regions do contain crucial regulatory sequences, the vast majority of this DNA serves no known function. Typically, these regions of the genome are the ones in which the fastest change, in evolutionary terms, is observed, because there is typically little to no selection pressure acting on these regions to preserve their sequences.
In contrast, regions which code...
In contrast, regions which code...
02:54Evolutionary Relationships through Genome Comparisons
Genome comparison is one of the excellent ways to interpret the evolutionary relationships between organisms. The basic principle of genome comparison is that if two species share a common feature, it is likely encoded by the DNA sequence conserved between both species. The advent of genome sequencing technologies in the late 20th century enabled scientists to understand the concept of conservation of domains between species and helped them to deduce evolutionary relationships across diverse...
03:21Phylogenetic Trees
Phylogenetic trees come in many forms. It matters in which sequence the organisms are arranged from the bottom to the top of the tree, but the branches can rotate at their nodes without altering the information. The lines connecting individual nodes can be straight, angled, or even curved.
01:28Microbial Phylogeny
Understanding the evolutionary relationships among microorganisms is fundamental to microbial ecology and taxonomy. Phylogenetic trees are essential tools for inferring these relationships, relying primarily on comparative analyses of molecular sequences such as DNA, RNA, or proteins. In microbial studies, these trees typically depict the evolutionary paths of diverse bacterial and archaeal species by mapping genetic differences accumulated over time.Phylogenetic trees are composed of tips,...