Video Experimental Relacionado
Updated: Mar 8, 2026
08:11
Author Spotlight: Understanding Microbe Adaptation Using Innovative Techniques for Exploring Thermophilic Evolution
Published on: June 14, 2024
1.5K
Genómica evolutiva de la diatomea adaptada al frío Fragilariopsis cylindrus
Thomas Mock1, Robert P Otillar2, Jan Strauss1
1School of Environmental Sciences, University of East Anglia, Norwich Research Park, Norwich NR4 7TJ, UK.
Nature
|January 17, 2017
Resumen
Las diatomeas del Océano Sur, Fragilariopsis cylindrus, muestran una divergencia genómica significativa. Estas variaciones genéticas únicas pueden explicar su adaptación a las condiciones extremas y fluctuantes del entorno antártico.
Área de la Ciencia:
- Biología marina
- La genómica
- Ecología
Sus antecedentes:
- El Océano Austral es un ecosistema marino clave con una producción primaria dominada por las diatomeas.
- La fotosíntesis diatómica está limitada por la escasez de hierro, la luz variable y la extensión del hielo marino.
- Los mecanismos de adaptación de las diatomeas a estas condiciones extremas siguen siendo en gran medida inexplorados.
Objetivo del estudio:
- Para investigar la evolución del genoma de la diatomea adaptada al frío Fragilariopsis cylindrus.
- Para comparar el genoma de F. cylindrus con diatomeas templadas para identificar rasgos adaptativos.
- Para entender cómo la divergencia genética contribuye a la supervivencia en el Océano Austral.
Principales métodos:
- Secuenciación de todo el genoma y genómica comparativa de Fragilariopsis cylindrus.
- Análisis de los loci genéticos con alelos muy divergentes.
- Análisis diferencial de la expresión génica bajo diversos factores ambientales estresantes (oscuridad, bajo contenido de hierro, congelación, temperatura elevada, aumento de CO2).
Principales resultados:
- Aproximadamente el 24,7% del genoma de F. cylindrus comprende loci genéticos muy divergentes (15,1 Mb).
- Estos alelos divergentes exhiben expresión dependiente de la condición, respondiendo a los cambios ambientales.
- La expresión más fuerte dependiente de la condición se correlaciona con altas tasas de sustituciones de nucleótidos no sinónimos a sinónimos, lo que indica una selección diversificada.
Conclusiones:
- Fragilariopsis cylindrus posee un genoma con divergencia alélica significativa, probablemente moldeado por fuertes presiones de selección.
- Los alelos divergentes juegan un papel crucial en la adaptación de las diatomeas al entorno dinámico del Océano Austral.
- Esta plasticidad genética permite que las diatomeas prosperen a pesar de las fluctuaciones estacionales y ambientales extremas.
Videos de Conceptos Relacionados
01:27Diversity of Archaea III
407
Crenarchaeota, a prominent phylum of Archaea, is remarkable for its ability to thrive in extreme environments characterized by high temperatures and acidity. These microorganisms inhabit sulfuric hot springs, volcanic systems, and submarine hydrothermal vents, where temperatures often exceed 100°C. The unique adaptations of Crenarchaeota not only allow survival under such extreme conditions but also provide insights into the mechanisms of life in primordial Earth-like...
407
01:23Red Algae
1.5K
Red algae, also known as rhodophytes, are primarily found in marine environments, though some species inhabit freshwater and terrestrial ecosystems. These organisms exist in both unicellular and multicellular forms, with some multicellular varieties reaching macroscopic sizes.As phototrophic organisms, red algae contain chlorophyll a; however, their chloroplasts lack chlorophyll b. Instead, they possess phycobiliproteins, which serve as major light-harvesting pigments, similar to those found in...
1.5K
02:45Responses to Heat and Cold Stress
15.5K
Every organism has an optimum temperature range within which healthy growth and physiological functioning can occur. At the ends of this range, there will be a minimum and maximum temperature that interrupt biological processes.
15.5K
02:05Gene Evolution - Fast or Slow?
8.3K
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...
8.3K
01:27Factors Influencing Microbial Growth: Temperature
1.7K
Microorganisms display remarkable adaptations, enabling them to thrive in diverse ecological niches across a wide range of temperatures. Temperature profoundly influences microbial growth by affecting enzymatic activity, membrane fluidity, and other cellular processes.Each microorganism operates within a specific temperature range defined by three cardinal points: minimum, optimum, and maximum. Below the minimum temperature, membranes lose fluidity, halting transport processes. Above the...
1.7K
01:24Diversity of Archaea II
596
Archaea, one of the three domains of life, exhibit remarkable diversity and adaptability, thriving in both extreme and moderate environments. Historically, most identified archaea have been classified into two major phyla: Euryarchaeota and Crenarchaeota. However, recent molecular studies have expanded this classification to include three additional phyla: Thaumarchaeota, Nanoarchaeota, and Korarchaeota, each exhibiting unique characteristics and ecological roles.Thaumarchaeota: Mesophiles...
596