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Related Concept Videos

Gene Evolution - Fast or Slow?02:05

Gene Evolution - Fast or Slow?

The genomes of eukaryotes are punctuated by long stretches of sequence which do not code for proteins or RNAs. Although some of these regions do contain crucial regulatory sequences, the vast majority of this DNA serves no known function. Typically, these regions of the genome are the ones in which the fastest change, in evolutionary terms, is observed, because there is typically little to no selection pressure acting on these regions to preserve their sequences.
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Conservation of Protein Domains Over Different Proteins02:26

Conservation of Protein Domains Over Different Proteins

Protein domains are small structurally independent units that are part of a single amino acid chain.  Although these domains are often structurally independent, they may rely on synergistic effects to perform their functions as part of a larger protein. Protein domains may be conserved within the same organism, as well as across different organisms.
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Cis-regulatory Sequences02:02

Cis-regulatory Sequences

Cis-regulatory sequences are short fragments of non-coding DNA that are present on the same chromosomes as the genes that they regulate. These fragments serve as binding sites for transcriptional regulators, proteins that are responsible for controlling gene transcription and differential gene expression across cell types in eukaryotes. Cis-regulatory sequences can be close to the gene of interest or thousands of bases away in the DNA sequence; however, those sequences that are further away are...
Gene Evolution - Fast or Slow?02:05

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Nucleoid01:24

Nucleoid

The nucleoid represents a structurally and functionally distinct region within prokaryotic cells, where the cell's DNA and associated proteins are housed. Unlike eukaryotic cells, prokaryotes lack a membrane-bound nucleus, and the nucleoid facilitates the organization and accessibility of the genetic material within this constraint. The DNA in most bacteria and archaea exists as a single, circular, double-stranded molecule that is highly compacted through supercoiling and interactions with...
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Evolution of Microbial Genome

Microbial genome evolution is a highly dynamic process shaped by continual gene gain and loss across species and strains. This genomic flexibility allows microorganisms to adapt rapidly to environmental pressures and interactions with other organisms. Central to understanding this diversity is the distinction between the core and pan genomes.The core genome comprises the genes shared by all sampled strains of a species, representing essential functions needed for fundamental cellular processes.

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Published on: October 16, 2016

Genome architecture drives protein evolution in ciliates.

Rebecca A Zufall1, Casey L McGrath, Spencer V Muse

  • 1Department of Biological Sciences, Smith College, USA.

Molecular Biology and Evolution
|June 9, 2006
PubMed
Summary

Genome architecture in ciliates drives faster protein evolution. Extensive genome processing in these microbes accelerates protein diversification compared to other eukaryotes.

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Area of Science:

  • Molecular Biology
  • Evolutionary Biology
  • Genomics

Background:

  • Microbial eukaryotes have historically yielded significant biological discoveries.
  • Genome architecture, particularly somatic genome processing in ciliates, is explored for its evolutionary implications.

Purpose of the Study:

  • To investigate the link between ciliate genome architecture and protein evolution rates.
  • To compare protein evolution in ciliates with other eukaryotic clades (plants, animals, fungi).
  • To assess the impact of macronuclear genome processing on protein divergence within ciliates.

Main Methods:

  • Utilized newly developed likelihood-based procedures for molecular evolution analysis.
  • Examined evolutionary rates across 6 genes.
  • Compared protein evolution in ciliates with extensively processed genomes to other ciliate lineages and other eukaryotic groups.

Main Results:

  • Ciliates exhibit higher nonsynonymous/synonymous substitution rates than plants, animals, and fungi, indicating accelerated protein evolution.
  • Protein divergence is significantly higher in ciliate lineages with highly processed macronuclear genomes.
  • 5 out of 6 genes studied showed increased rates of protein evolution in ciliates.

Conclusions:

  • Ciliate genome architecture, involving chromosomal processing and macronuclear amitosis, facilitates novel exploration of protein space.
  • Genome architecture significantly impacts molecular evolution rates, particularly in ciliates.
  • Further studies across diverse eukaryotes are predicted to reveal more evidence of genome architecture's influence on evolution.