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Evolutionary Relationships through Genome Comparisons02:54

Evolutionary Relationships through Genome Comparisons

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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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Phylogeny01:23

Phylogeny

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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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Viral Mutations00:36

Viral Mutations

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A mutation is a change in the sequence of bases of DNA or RNA in a genome. Some mutations occur during replication of the genome due to errors made by the polymerase enzymes that replicate DNA or RNA. Unlike DNA polymerase, RNA polymerase is prone to errors because it is not capable of “proofreading” its work. Viruses with RNA-based genomes, like HIV, therefore accrue mutations faster than viruses with DNA-based genomes. Because mutation and recombination provide the raw material...
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Viral Recombination00:57

Viral Recombination

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Cells are sometimes infected by more than one virus at once. When two viruses disassemble to expose their genomes for replication in the same cell, similar regions of their genomes can pair together and exchange sequences in a process called recombination. Alternatively, viruses with segmented genomes can swap segments in a process called reassortment.
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Phylogenetic Trees03:21

Phylogenetic Trees

49.0K
Phylogenetic trees come in many forms. It matters in which sequence the organisms are arranged from the bottom to the top of the tree, but the branches can rotate at their nodes without altering the information. The lines connecting individual nodes can be straight, angled, or even curved.
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Retroviruses02:33

Retroviruses

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Retroviruses and retrotransposons both insert copies of their genetic elements into the genome of the host cell. Thus, the viral genes are passed on when the host genome is replicated or translated. A typical retroviral DNA sequence contains 3-4 genes that encode the different proteins required for its structural assembly and function as a molecular parasite. This DNA is transcribed into a single mRNA, which is very similar in structure to conventional mRNAs, i.e., it is capped at the 5’...
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Related Experiment Video

Updated: Dec 22, 2025

Prediction of HIV-1 Coreceptor Usage Tropism by Sequence Analysis using a Genotypic Approach
07:06

Prediction of HIV-1 Coreceptor Usage Tropism by Sequence Analysis using a Genotypic Approach

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Predicting the global mammalian viral sharing network using phylogeography.

Gregory F Albery1,2,3, Evan A Eskew4, Noam Ross4

  • 1EcoHealth Alliance, New York, NY, USA. gfalbery@gmail.com.

Nature Communications
|May 10, 2020
PubMed
Summary

Mammalian viral sharing is predicted by host traits like phylogeny and geography. This model forecasts high transmission rates in tropical rodents and bats, aiding pathogen surveillance.

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Area of Science:

  • Ecology
  • Virology
  • Macroecology

Background:

  • Interspecific viral transmission is crucial for understanding viral ecology, evolution, and disease spillover.
  • Previous research identified macroecological drivers of viral sharing but lacked a pan-mammalian predictive model.

Purpose of the Study:

  • To develop and validate a predictive model for viral sharing across all mammal species.
  • To identify key host traits influencing viral transmission patterns in mammals.

Main Methods:

  • Employed a conservative modeling framework using host phylogenetic similarity and geographic range overlap.
  • Predicted global viral sharing patterns for 4,196 mammal species.
  • Validated the model using internal cross-validation and an external dataset.

Main Results:

  • Host phylogenetic similarity and geographic range overlap were confirmed as strong, nonlinear predictors of viral sharing.
  • High rates of mammalian viral sharing are predicted in tropical regions, especially among rodents and bats.
  • Geographic and taxonomic differences were observed in within- and between-order viral sharing.

Conclusions:

  • Ecological and phylogenetic factors significantly shape mammalian viral communities.
  • The developed model provides a robust framework for predicting viral host range.
  • Findings can guide pathogen surveillance and conservation efforts for mammals.