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Gene Duplication and Divergence02:37

Gene Duplication and Divergence

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The seminal work of Ohno in 1970 popularized the idea of gene duplication and divergence. DNA sequence comparison studies reveal that a large portion of the genes in bacteria, archaebacteria, and eukaryotes was  generated by gene duplication and divergence, indicating its critical role in evolution.
The duplicated copies of the gene are called Paralogs. Paralogs with similar sequences and functions form a gene family. Across several species, a large number of gene families are...
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Gene Families01:57

Gene Families

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Gene families consist of groups of genes proposed to have originated from a common ancestor. Typically these arise through events in which a gene or genes are mistakenly duplicated during cell division. Unlike their parent genes (which are subject to selection pressure to maintain function), these gene copies do not need to preserve their sequences and may evolve at a relatively faster rate.
Occasionally these regions can be adapted to take on new roles within the organism, becoming novel genes...
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Genome Size and the Evolution of New Genes03:21

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While every living organism has a genome of some kind (be it RNA, or DNA), there is considerable variation in the sizes of these blueprints. One major factor that impacts genome size is whether the organism is prokaryotic or eukaryotic. In prokaryotes, the genome contains little to no non-coding sequence, such that genes are tightly clustered in groups or operons sequentially along the chromosome. Conversely, the genes in eukaryotes are punctuated by long stretches of non-coding sequence.
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Eukaryotic Evolution01:24

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The endosymbiont theory is the most widely accepted theory of eukaryotic evolution; however, its progression is still somewhat debated. According to the nucleus-first hypothesis, the ancestral prokaryote first evolved a membrane to enclose DNA and form the nucleus. Conversely, the mitochondria-first hypothesis suggests that the nucleus was formed after endosymbiosis of mitochondria.
Contrary to the endosymbiont theory, the eukaryote-first hypothesis proposes that the simpler prokaryotic and...
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Evolutionary Relationships through Genome Comparisons02:54

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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...
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Updated: Jan 6, 2026

Using Phylogenetic Analysis to Investigate Eukaryotic Gene Origin
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Using Phylogenetic Analysis to Investigate Eukaryotic Gene Origin

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Las duplicaciones de genes con fecha aclaran el conjunto evolutivo de los eucariotas

Christopher J Kay1,2, Anja Spang3,4, Gergely J Szöllősi5,6,7

  • 1Bristol Palaeobiology Group, School of Earth Sciences, University of Bristol, Bristol, UK. chris.kay@bristol.ac.uk.

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|December 3, 2025
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Resumen

El origen de los eucariotas involucró características complejas de la célula huésped que evolucionaron antes de la endosimbiosis mitocondrial. Este estudio data las duplicaciones genéticas, apoyando una secuencia evolutiva de mitocondrias tardías para eucariotas.

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Área de la Ciencia:

  • Biología evolutiva
  • Evolución molecular
  • Biología celular

Sus antecedentes:

  • El origen de las células eucariotas (eucariogénesis) es un evento fundamental en la historia de la vida, con hipótesis clave que difieren en el momento de la adquisición mitocondrial.
  • Comprender la eucariogénesis es un desafío debido a la falta de linajes intermedios.
  • Los eventos de duplicación génica durante la eucariogénesis ofrecen información sobre la línea de tiempo evolutiva del ensamblaje celular eucariótico.

Objetivo del estudio:

  • Para determinar la línea de tiempo evolutiva de las duplicaciones de genes durante la eucariogénesis.
  • Para probar las hipótesis con respecto a la secuencia de eventos en la evolución de las células eucariotas, particularmente el momento de la endosimbiosis mitocondrial.
  • Para inferir las características de la célula huésped arqueal antes de la endosimbiosis.

Principales métodos:

  • Utilizó un enfoque de reloj molecular relajado para datar eventos de duplicación de genes.
  • Análisis de las escalas de tiempo de duplicación de genes para reconstruir la secuencia de la eucariogénesis.
  • Los hallazgos integrados con las eras geológicas (del mesoarqueo al paleoproterozoico) para las restricciones temporales.

Principales resultados:

  • La eucariogénesis ocurrió entre las eras mesoarquea y paleoproterozoica tardía.
  • Las características celulares complejas, que incluyen un citoesqueleto, núcleo y sistema de endomembrana, precedieron a la endosimbiosis mitocondrial.
  • Las duplicaciones genéticas indican que estas características complejas surgieron entre hace 3.0 y 2.25 mil millones de años.

Conclusiones:

  • Rechaza los modelos de eucariogénesis de las "mitocondrias tempranas".
  • Apoya un modelo "complejo-arqueo, mitocondrial tardío" para la evolución eucariota.
  • Sugiere que una célula huésped arqueal con características avanzadas existió en océanos anóxicos, potencialmente beneficiándose de la sintrofia.