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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 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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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.
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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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Genome duplication in a long-term multicellularity evolution experiment.

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.

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Summary
This summary is machine-generated.

Whole-genome duplication (WGD) rapidly evolved in yeast under selection for multicellularity, persisting due to immediate fitness benefits and enabling further adaptations. This study reveals WGD

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Area of Science:

  • Evolutionary biology
  • Genomics
  • Yeast research

Background:

  • Whole-genome duplication (WGD) is common in eukaryotes and drives evolution.
  • Polyploid genome instability poses challenges to understanding WGD origins and persistence.
  • The evolutionary dynamics of WGD, especially its role in adaptation, require empirical investigation.

Purpose of the Study:

  • To investigate the rapid evolution and long-term persistence of whole-genome duplication (WGD) in Saccharomyces cerevisiae under specific selective pressures.
  • To understand the mechanisms by which WGD arises, is maintained, and facilitates adaptation in a multicellular context.
  • To provide empirical insights into the evolutionary consequences of WGD in a long-term experimental evolution setting.

Main Methods:

  • Utilized the Multicellularity Long Term Evolution Experiment (MuLTEE) with Saccharomyces cerevisiae.
  • Applied synthetic reconstruction and biophysical modeling to analyze tetraploidy.
  • Employed counter-selection experiments to assess fitness benefits and maintenance of tetraploidy.

Main Results:

  • Diploid yeast rapidly evolved tetraploidy within 50 days under selection for larger multicellular size.
  • Tetraploid yeast persisted for over 5,000 generations despite genomic instability.
  • Tetraploidy conferred immediate fitness advantages by increasing cell size and cluster formation, maintaining its persistence.
  • Tetraploidy facilitated further adaptation, including the evolution of multicellularity via aneuploidy.

Conclusions:

  • WGD can rapidly evolve and persist when providing immediate adaptive benefits under specific environmental conditions.
  • Selection actively maintains WGD, overcoming typical reversion to diploidy, and enabling long-term evolutionary innovation.
  • WGD acts as a crucial facilitator for novel adaptations by increasing genetic variation and enabling new evolutionary pathways.