Video Experimental Relacionado
Updated: Apr 26, 2026
07:57
Sampling and Pretreatment of Tooth Enamel Carbonate for Stable Carbon and Oxygen Isotope Analysis
Published on: August 15, 2018
14.0K
Repitiendo las transiciones evolutivas del registro fósil dental
Enni Harjunmaa1, Kerstin Seidel2, Teemu Häkkinen1
1Developmental Biology Program, Institute of Biotechnology, University of Helsinki, P.O. Box 56, FIN-00014 Helsinki, Finland.
Nature
|August 1, 2014
Resumen
Los investigadores experimentalmente reproducido transiciones evolutivas en los dientes de ratón mediante la manipulación de las vías de desarrollo. Esto proporciona un nuevo marco para comprender cómo ocurren los cambios morfológicos y predecir patrones evolutivos en los mamíferos.
Área de la Ciencia:
- Biología del desarrollo Biología del desarrollo.
- La morfología evolutiva de la morfología evolutiva.
- Paleontología Paleontología.
Sus antecedentes:
- Las relaciones evolutivas de las especies extintas se determinan principalmente por el análisis morfológico de los caracteres.
- Los fundamentos del desarrollo de las interdependencias de los personajes son poco conocidos debido a la limitada resolución experimental.
- Las interdependencias de los personajes impactan significativamente en las interpretaciones evolutivas.
Objetivo del estudio:
- Investigar experimental y computacionalmente cómo las modificaciones graduales del desarrollo afectan a los caracteres morfológicos.
- Para aclarar la base del desarrollo de las interdependencias de carácter en la dentición de los mamíferos.
- Establecer un método para predecir patrones morfológicos y transiciones evolutivas.
Principales métodos:
- Adición gradual de la proteína ectodysplasin A (EDA) a explantes dentales de ratón con una mutación nula de Eda.
- Modelado computacional para analizar las interdependencias de los personajes.
- Inhibición in vivo de la señalización sónica del erizo en Eda. dientes de ratón nulos.
Principales resultados:
- Se generaron con éxito fenotipos de dientes intermedios mediante la modulación de los niveles de proteína EDA durante el desarrollo.
- Se identificaron interdependencias de caracteres basadas en el desarrollo, lo que permite predecir la morfología dental de los mamíferos.
- La manipulación in vivo reprodujo los caracteres dentales de roedores ancestrales.
Conclusiones:
- La reproducción experimental de transiciones evolutivamente informativas es alcanzable.
- Este estudio proporciona un marco de desarrollo para comprender y predecir las transiciones morfológicas de carácter-estado en los estudios evolutivos.
- Los hallazgos ofrecen expectativas basadas en el desarrollo para reconstruir historias evolutivas.
Videos de Conceptos Relacionados
02:56The Fossil Record
22.9K
The fossil record documents only a small fraction of all organisms that have ever inhabited Earth. Fossilization is a rare process, and most organisms never become fossils. Moreover, the fossil record only exhibits fossils that have been discovered. Nevertheless, sedimentary rock fossils of long-lived, abundant, hard-bodied organisms dominate the fossil record. These fossils offer valuable information, such as an organism's physical form, behavior, and age. Studying the fossil record helps...
22.9K
02:35What is Evolutionary History?
31.0K
Scientists record evolutionary history by analyzing fossil, morphological, and genetic data. The fossil record documents the history of life on Earth and provides evidence for evolution. However, both fossil and living organisms offer evidence that outlines Earth’s evolutionary history.
31.0K
02:55The Evidence for Evolution
39.8K
Genetic variations accumulating within populations over generations give rise to biological evolution. Evolutionary changes can result in the formation of novel varieties and entire new species. These changes are responsible for the diverse forms of life inhabiting the planet. The evidence for evolution suggests that all living organisms descended from common ancestors.
39.8K
01:15Teeth
2.2K
The formation of teeth, also known as odontogenesis, is a complex process that begins in utero, around the sixth week of embryonic development. There are three stages to this process: the bud stage, the cap stage, and the bell stage.
In the bud stage, the tooth germ (an aggregation of cells) starts to form in the developing jawbone. During the cap stage, the tooth germ differentiates into enamel organ, dental papilla, and dental sac, which will later develop into the tooth's enamel, dentin...
In the bud stage, the tooth germ (an aggregation of cells) starts to form in the developing jawbone. During the cap stage, the tooth germ differentiates into enamel organ, dental papilla, and dental sac, which will later develop into the tooth's enamel, dentin...
2.2K
01:54Convergent Evolution
27.5K
Evolution shapes the features of organisms over time, ensuring that they are suited for the environments in which they live. Sometimes, selection pressure leads to the rise of similar but unrelated adaptations in organisms with no recent common ancestors, a process known as convergent evolution.
27.5K
02:54Evolutionary Relationships through Genome Comparisons
5.8K
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...
5.8K