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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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Polytene Chromosomes02:04

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Polytene chromosomes are giant interphase chromosomes with several DNA strands placed side by side. They were discovered in the year 1881 by Balbiani in salivary glands, intestine, muscles, malpighian tubules, and hypoderm of larvae Chironomus plumosus. Hence, these are also called "Salivary gland chromosomes." These are found in insects of the order Diptera and Collembola; in certain organs of mammals; and synergids, antipodes of flowering plants. Polytene chromosomes are also...
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Duplication of Chromatin Structure02:05

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The process of chromosome duplication during cell division requires genome-wide disruption and re-assembly of chromatin. The chromatin structure must be accurately inherited, reassembled, and maintained in the daughter cells to ensure lineage propagation.
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Gene Families01:57

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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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DNA replication has three main steps: initiation, elongation, and termination. Replication in prokaryotes begins when initiator proteins bind to the single origin of replication (ori) on the cell's circular chromosome. Replication then proceeds around the entire circle of the chromosome in each direction from the two replication forks, resulting in two DNA molecules.
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Chromosome Replicating Timing Combined with Fluorescent In situ Hybridization
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La duplicación del genoma en un experimento de evolución multicelular a largo plazo

Kai Tong1,2,3,4, Sayantan Datta5,6, Vivian Cheng5,7

  • 1School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA, USA. kaitong@bu.edu.

Nature
|March 5, 2025
PubMed
Resumen
Este resumen es generado por máquina.

La duplicación de todo el genoma (WGD) evolucionó rápidamente en la levadura bajo selección para la multicelularidad, persistiendo debido a los beneficios inmediatos de la aptitud y permitiendo nuevas adaptaciones. Este estudio revela que el

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Área de la Ciencia:

  • Biología evolutiva
  • La genómica
  • Investigación de la levadura

Sus antecedentes:

  • La duplicación de todo el genoma (WGD) es común en las eucariotas y impulsa la evolución.
  • La inestabilidad del genoma poliploide plantea desafíos para comprender los orígenes y la persistencia de WGD.
  • La dinámica evolutiva de WGD, especialmente su papel en la adaptación, requiere una investigación empírica.

Objetivo del estudio:

  • Investigar la evolución rápida y la persistencia a largo plazo de la duplicación de todo el genoma (WGD) en Saccharomyces cerevisiae bajo presiones selectivas específicas.
  • Comprender los mecanismos por los que surge el WGD, se mantiene y facilita la adaptación en un contexto multicelular.
  • Proporcionar conocimientos empíricos sobre las consecuencias evolutivas de WGD en un entorno de evolución experimental a largo plazo.

Principales métodos:

  • Utilizó el Experimento de Evolución a Largo Plazo de la Multicelularidad (MuLTEE) con Saccharomyces cerevisiae.
  • Aplicó la reconstrucción sintética y el modelado biofísico para analizar la tetraploidía.
  • Se emplearon experimentos de contra-selección para evaluar los beneficios de la aptitud y el mantenimiento de la tetraploidía.

Principales resultados:

  • La levadura diploide evolucionó rápidamente a la tetraploidía en 50 días bajo selección para un tamaño multicelular más grande.
  • La levadura tetraploide persistió durante más de 5.000 generaciones a pesar de la inestabilidad genómica.
  • La tetraploidía confería ventajas de aptitud inmediatas al aumentar el tamaño de las células y la formación de racimos, manteniendo su persistencia.
  • La tetraploidía facilitó una mayor adaptación, incluida la evolución de la multicelularidad a través de la aneuploidía.

Conclusiones:

  • El WGD puede evolucionar rápidamente y persistir cuando proporciona beneficios de adaptación inmediatos en condiciones ambientales específicas.
  • La selección mantiene activamente el WGD, superando la reversión típica a la diploidía y permitiendo la innovación evolutiva a largo plazo.
  • El WGD actúa como un facilitador crucial para nuevas adaptaciones al aumentar la variación genética y permitir nuevas vías evolutivas.