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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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A mutation is a change in the sequence of bases of DNA or RNA in a genome. Some mutations occur during replication of the genome due to errors made by the polymerase enzymes that replicate DNA or RNA. Unlike DNA polymerase, RNA polymerase is prone to errors because it is not capable of “proofreading” its work. Viruses with RNA-based genomes, like HIV, therefore accrue mutations faster than viruses with DNA-based genomes. Because mutation and recombination provide the raw material...
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When a pathogen enters the body and reproduces, it can cause an infection, damage body cells, and cause illness symptoms that eventually lead to disease. Therefore, its prevention requires breaking the chain of infection.
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Retroviruses and retrotransposons both insert copies of their genetic elements into the genome of the host cell. Thus, the viral genes are passed on when the host genome is replicated or translated. A typical retroviral DNA sequence contains 3-4 genes that encode the different proteins required for its structural assembly and function as a molecular parasite. This DNA is transcribed into a single mRNA, which is very similar in structure to conventional mRNAs, i.e., it is capped at the 5’...
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The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
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Cells are sometimes infected by more than one virus at once. When two viruses disassemble to expose their genomes for replication in the same cell, similar regions of their genomes can pair together and exchange sequences in a process called recombination. Alternatively, viruses with segmented genomes can swap segments in a process called reassortment.
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Updated: Sep 9, 2025

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Evolución de la virulencia: Pensar fuera del huésped

Luís M Silva1,2, Jacob C Koella1

  • 1Institute of Biology University of Neuchâtel Neuchâtel Switzerland.

Evolutionary applications
|September 2, 2025
PubMed
Resumen

La evolución de la virulencia depende de una compensación entre el daño del huésped y la transmisión. Este estudio muestra que los parásitos más virulentos sobreviven mal fuera del huésped, lo que afecta a las predicciones de propagación de enfermedades.

Palabras clave:
gravedad de la infeccióninfecciosidadMicrosporidias y sus derivadosEvolución del patógenoTransmisiónla virulencia

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Área de la Ciencia:

  • Biología evolutiva
  • Parasitología
  • Ecología de las enfermedades

Sus antecedentes:

  • La evolución de la teoría de la virulencia plantea una compensación entre la virulencia del patógeno y la tasa de transmisión.
  • La medición de esta compensación es un desafío, posiblemente debido a la falta de datos sobre la supervivencia del parásito fuera del huésped.
  • Un marco de descomposición de la transmisión destaca la importancia de la supervivencia ambiental para comprender la evolución de la virulencia.

Objetivo del estudio:

  • Investigar la relación entre la virulencia dentro del huésped y la supervivencia ambiental en el parásito microsporídeo *Vavraia culicis*.
  • Para explorar cómo el crecimiento y la virulencia del parásito afectan su capacidad de sobrevivir fuera del mosquito huésped, Anopheles gambiae.
  • Evaluar el papel de la supervivencia ambiental en el contexto más amplio de la aptitud del parásito y la evolución de la enfermedad.

Principales métodos:

  • Se utilizaron distintas líneas de parásitos de *Vavraia culicis* que exhiben diferentes niveles de virulencia.
  • Infectó al mosquito huésped *Anopheles gambiae* con estas líneas parasitarias.
  • Virulencia cuantificada del parásito dentro del huésped y tasas de supervivencia en el entorno externo.

Principales resultados:

  • Las líneas de parásitos con mayor virulencia y tasas de crecimiento dentro de *Anopheles gambiae* mostraron una supervivencia ambiental reducida.
  • Este costo para la supervivencia ambiental fue independiente de la temperatura ambiente.
  • Se observó una clara compensación entre la aptitud dentro del huésped y la supervivencia fuera del huésped.

Conclusiones:

  • La virulencia dentro del huésped y la supervivencia ambiental están inversamente relacionadas, apoyando la teoría del intercambio de virulencia.
  • Comprender la supervivencia del parásito fuera del huésped es crucial para las predicciones precisas de la evolución y propagación de enfermedades infecciosas.
  • Los estudios futuros deben integrar tanto la dinámica dentro del huésped como las etapas de transmisión ambiental para comprender completamente la aptitud del parásito.