Video Experimental Relacionado
Updated: Sep 10, 2025
09:06
Removal of Exogenous Materials from the Outer Portion of Frozen Cores to Investigate the Ancient Biological Communities Harbored Inside
Published on: July 3, 2016
8.2K
Decodificación de comunidades microbianas pasadas Cambios inducidos por eventos de perturbación natural y
S Varrella1,2, M Tangherlini3, C Corinaldesi2,4
1Department of Life and Environmental Sciences, Polytechnic University of Marche, UNIVPM, Ancona, Italy.
Molecular ecology
|August 22, 2025
Resumen
Los archivos de ADN de sedimentos marinos revelan cómo la contaminación industrial reformó las comunidades microbianas a lo largo de los siglos. La diversidad microbiana aumentó durante los períodos industriales, mostrando adaptación a contaminantes y eventos volcánicos.
Área de la Ciencia:
- Microbiología marina
- Genómica del medio ambiente
- Paleoceanografía
Sus antecedentes:
- Los ecosistemas costeros están amenazados por los contaminantes industriales, con impactos a largo plazo en las comunidades microbianas poco claros.
- Comprender las respuestas microbianas a la contaminación histórica es crucial para la gestión de los ecosistemas.
Objetivo del estudio:
- Analizar las firmas genéticas procariotas en el ADN de los sedimentos para reconstruir los cambios a largo plazo de la comunidad microbiana.
- Investigar los efectos de la industrialización y la actividad volcánica en la diversidad y función microbiana en una bahía contaminada.
Principales métodos:
- Análisis de ADN extracelular de núcleos de sedimentos que abarcan desde mediados del siglo XVII hasta el presente.
- Cuantificación de los números de copia de ADN r 16S arqueal y bacteriano.
- Identificación de las variantes de secuencia de Amplicon procariotas (ASV) y evaluación de la diversidad beta microbiana.
Principales resultados:
- El número de copias de 16S rDNA arqueal aumentó significativamente durante el período industrial.
- La diversidad microbiana (VSA) aumentó de 70 a 182 familias procariotas desde el período preindustrial hasta el industrial.
- La alta diversidad beta microbiana indicó cambios en la estructura de la comunidad, con más de 50 taxones afectados por la contaminación y las erupciones.
Conclusiones:
- El ADN extracelular en los sedimentos marinos sirve como un valioso archivo de la diversidad microbiana bentónica pasada.
- La contaminación industrial y los eventos volcánicos impulsaron la sucesión microbiana, seleccionando taxones adaptados a condiciones adversas.
- El análisis del ADN sedimentario proporciona información sobre la dinámica del ecosistema a largo plazo y la resiliencia microbiana.
Videos de Conceptos Relacionados
01:29Modern Molecular Taxonomy
137
Advancements in molecular biology have revolutionized the identification and characterization of bacteria, with multiple methods leveraging DNA sequencing for enhanced precision. As sequencing technologies improve and costs decline, these approaches are increasingly used in clinical, environmental, and evolutionary studies.Multilocus Sequence Typing (MLST) examines several housekeeping genes, essential chromosomal genes encoding cellular functions, to distinguish strains. Approximately...
137
01:20Applications of Molecular Taxonomy
99
Molecular taxonomy has revolutionized the understanding and classification of bacteria, providing precise insights into their diversity, evolutionary relationships, and ecological roles. By utilizing molecular techniques such as DNA sequencing and fingerprinting, researchers have made significant strides in various fields related to bacterial studies.Resolving Taxonomic AmbiguitiesMolecular taxonomy has been instrumental in distinguishing closely related bacterial species initially thought to...
99
01:26Transformation
86
Microbial communities are dynamic environments where cell lysis releases free DNA into the surroundings. Other cells can take up this extracellular DNA through a process known as transformation.When a cell incorporates this foreign DNA into its genome, resulting in genetic modification, the process is known as transformation. Cells capable of this process are termed competent. Competence can be natural, as observed in certain bacteria and archaea, or artificially induced in the...
86
00:46Genomic DNA in Prokaryotes
44.6K
The genome of most prokaryotic organisms consists of double-stranded DNA organized into one circular chromosome in a region of cytoplasm called the nucleoid. The chromosome is tightly wound, or supercoiled, for efficient storage. Prokaryotes also contain other circular pieces of DNA called plasmids. These plasmids are smaller than the chromosome and often carry genes that confer adaptive functions, such as antibiotic resistance.
Genomic Diversity in Bacteria
Although bacterial genomes are much...
Genomic Diversity in Bacteria
Although bacterial genomes are much...
44.6K
03:00Next-generation Sequencing
92.6K
The first human genome sequencing project cost $2.7 billion and was declared complete in 2003, after 15 years of international cooperation and collaboration between several research teams and funding agencies. Today, with the advent of next-generation sequencing technologies, the cost and time of sequencing a human genome have dropped over 100 fold.
Next-Generation Sequencing Methods
Although all next-generation methods use different technologies, they all share a set of standard features....
Next-Generation Sequencing Methods
Although all next-generation methods use different technologies, they all share a set of standard features....
92.6K
02:54Evolutionary Relationships through Genome Comparisons
6.1K
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...
6.1K