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Video Experimental Relacionado

Updated: Feb 19, 2026

Author Spotlight: Alignment of Synchronized Time-Series Data Using the Characterizing Loss of Cell Cycle Synchrony Model for Cross-Experiment Comparisons
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Datación del reloj molecular utilizando modelos de mezcla complejos: aplicado a simbiontes antiguos

Sishuo Wang1, Andrew Meade2

  • 1Department of Microbiology, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong SAR, China.

Molecular biology and evolution
|February 18, 2026
PubMed
Resumen

El nuevo software, phyloHessian, mejora la precisión del reloj molecular utilizando modelos de sustitución complejos. Esto mejora la fiabilidad de la línea de tiempo evolutiva para linajes de tiempo profundo y de rápida evolución.

Palabras clave:
MCMCtreePAMLverosimilitud aproximadamodelo de mezcla complejoevolución de tiempo profundoreloj molecularevolución de patógenossimbionte

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Área de la Ciencia:

  • Biología Evolutiva
  • Biología Computacional
  • Filogenética

Sus antecedentes:

  • Los relojes moleculares son cruciales para la cronología evolutiva, pero a menudo son inexactos debido a modelos de sustitución simples.
  • La heterogeneidad de sustitución y la saturación en linajes de tiempo profundo o de rápida evolución comprometen los métodos actuales del reloj molecular.

Objetivo del estudio:

  • Introducir phyloHessian, un software basado en Julia para la datación molecular utilizando modelos de sustitución de mezcla complejos.
  • Mejorar la precisión de las estimaciones del tiempo de divergencia y la tasa de sustitución en los análisis del reloj molecular.

Principales métodos:

  • phyloHessian calcula la matriz Hessiana filogenética.
  • Integra la matriz Hessiana en el marco de verosimilitud aproximada de PAML-MCMCtree para la datación.
  • Utiliza modelos de sustitución de mezcla complejos en lugar de homogéneos.

Principales resultados:

  • Los modelos de mezcla complejos mejoran significativamente la precisión del tiempo de divergencia y la tasa de sustitución en filogenias de tiempo profundo.
  • Los modelos de mezcla muestran una mayor robustez a las incertidumbres del modelo y la calibración en comparación con los modelos homogéneos.
  • Los análisis empíricos revelaron tasas de sustitución aceleradas y tiempos de divergencia alterados para Microsporidia y Rickettsiales.

Conclusiones:

  • La incorporación de modelos de sustitución de mezcla complejos es vital para obtener líneas de tiempo evolutivas fiables.
  • phyloHessian mejora el estudio de linajes de tiempo profundo o de rápida evolución.
  • Se sugieren historias evolutivas revisadas y orígenes de asociación de huéspedes para simbiontes antiguos.