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Synteny and Evolution02:31

Synteny and Evolution

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John H. Renwick first coined the term “synteny” in 1971, which refers to the genes present on the same chromosomes, even if they are not genetically linked. The species with common ancestry tend to show conserved syntenic regions. Therefore, the concept of synteny is nowadays used to describe the evolutionary relationship between species.
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Phylogeny is concerned with the evolutionary diversification of organisms or groups of organisms. A group of organisms with a name is called a taxon (singular). Taxa (plural) can span different levels of the evolutionary hierarchy. For instance, the group containing all birds is a taxon (comprising the class Aves), and the group of all species of daisies (the genus Bellis) is a taxon. Phylogenies can likewise include just one genus (i.e., depict species relationships) or span an entire kingdom.
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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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Using Phylogenetic Analysis to Investigate Eukaryotic Gene Origin
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Phylogenomic analyses provide insights into primate evolution.

Yong Shao1, Long Zhou2, Fang Li3,4

  • 1State Key Laboratory of Genetic Resources and Evolution, Kunming Natural History Museum of Zoology, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming 650201, China.

Science (New York, N.Y.)
|June 1, 2023
PubMed
Summary
This summary is machine-generated.

This study analyzed 50 primate genomes to understand human evolution. Key genomic innovations in the Simiiformes ancestor likely drove primate diversity and human evolution.

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Area of Science:

  • Genomics
  • Evolutionary Biology
  • Comparative Genomics

Background:

  • Understanding primate genome evolution is crucial for human genetic architecture insights.
  • Primate diversity stems from complex evolutionary processes.
  • Previous studies lacked representation from key primate groups.

Purpose of the Study:

  • To conduct a comprehensive phylogenetic analysis of 50 primate genomes.
  • To identify genes under positive selection across primate lineages.
  • To pinpoint key genomic innovations influencing primate and human evolution.

Main Methods:

  • Comparative genomic analysis of 50 primate species.
  • Phylogenetic analysis incorporating 38 genera and 14 families.
  • Identification of genes under positive selection.

Main Results:

  • Revealed heterogeneous rates of genomic rearrangement and gene evolution.
  • Identified thousands of genes under positive selection in nervous, skeletal, and digestive systems.
  • Discovered significant genomic innovations at the Simiiformes ancestral node.

Conclusions:

  • Primate genomic evolution is characterized by lineage-specific adaptations.
  • Positive selection on specific genes facilitated primate innovations.
  • Early Simiiformes genomic innovations profoundly impacted primate radiation and human evolution.