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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.
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Among the three main modes of HGT—transformation, conjugation, and transduction—transduction is unique in that it is mediated by bacteriophages, or bacterial viruses.Transduction occurs in two ways. Generalized transduction occurs during the lytic cycle of a bacteriophage infection. In this process, bacteriophages infect bacterial cells, replicate within them, and ultimately cause cell lysis, releasing newly assembled virions. Occasionally, random fragments of the bacterial genome...
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Bacterial and archaeal cells exhibit remarkable diversity in shape and structure, critical in their adaptability and functionality. Among bacteria, the most commonly observed shapes include cocci and bacilli. Cocci are spherical and may exist singly or in groupings such as pairs (diplococci), chains (streptococci), clusters (staphylococci), or tetrads. Bacilli, in contrast, are rod-shaped and can also occur as single cells, in pairs, or chains, depending on their environmental and genetic...
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Microbiology, a scientific field dedicated to the study of microorganisms, has undergone profound development since its inception in the 17th century. Its history is marked by key discoveries and technological advancements that have shaped our understanding of life at the microscopic level and transformed medicine, agriculture, and industry.Early Foundations of MicrobiologyThe early foundations of microbiology were built on groundbreaking observations and the development of pioneering...
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Daily Transfers, Archiving Populations, and Measuring Fitness in the Long-Term Evolution Experiment with Escherichia coli
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Evolución, interacciones entre humanos y microbios y plasticidad de la historia de la vida

Graham Rook1, Fredrik Bäckhed2, Bruce R Levin3

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|August 10, 2017
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Resumen

La salud humana depende de un delicado equilibrio con los microbios. Nuestro metabolismo es un tira y afloja constante, manejando los microbios beneficiosos mientras excluimos los dañinos, influyendo en la historia de la vida.

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Área de la Ciencia:

  • Microbiología
  • Fisiología humana
  • Biología evolutiva

Sus antecedentes:

  • Los microorganismos fueron parte integral de la vida temprana y continúan dando forma a la fisiología humana.
  • Los vertebrados albergan extensas comunidades microbianas (microbiota), particularmente en el intestino, que influyen en el metabolismo humano.
  • Los estilos de vida modernos y las prácticas médicas alteran la composición de la microbiota y reducen la exposición a microbios coevolucionados.

Objetivo del estudio:

  • Explorar la interacción evolutiva y fisiológica entre los humanos y sus microbios asociados.
  • Para entender cómo las comunidades microbianas influyen en el metabolismo humano y la historia de la vida.
  • Para diferenciar entre los microbios beneficiosos co-evolucionados y los patógenos intrusivos.

Principales métodos:

  • Este estudio es una revisión conceptual, que sintetiza la investigación existente sobre las interacciones entre humanos y microbios.
  • Examina la historia evolutiva de la simbiosis microbiana en los eucariotas.
  • Analiza las contribuciones metabólicas de la microbiota a la fisiología del huésped.

Principales resultados:

  • Una parte significativa del genoma humano y las moléculas pequeñas de la sangre se originan a partir de la actividad microbiana.
  • El metabolismo humano se caracteriza por un equilibrio dinámico entre microbios beneficiosos y perjudiciales.
  • Las alteraciones de la microbiota y el aumento de la exposición a nuevos patógenos plantean desafíos para la salud.

Conclusiones:

  • El metabolismo humano y la historia de la vida están profundamente moldeados por el manejo de microbios simbióticos y patógenos.
  • Comprender estas interacciones es crucial para hacer frente a los desafíos de salud modernos.
  • La historia evolutiva de las relaciones entre humanos y microbios proporciona un contexto para los procesos fisiológicos actuales.