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Related Concept Videos

Gene Evolution - Fast or Slow?02:05

Gene Evolution - Fast or Slow?

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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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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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Genetic variations accumulating within populations over generations give rise to biological evolution. Evolutionary changes can result in the formation of novel varieties and entire new species. These changes are responsible for the diverse forms of life inhabiting the planet. The evidence for evolution suggests that all living organisms descended from common ancestors.
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Related Experiment Video

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Microinjection for Transgenesis and Genome Editing in Threespine Sticklebacks
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Rates of evolution differ between cell types identified by single-cell RNAseq in threespine stickleback.

Maria L Rodgers, Swapna Subramanian, Lauren E Fuess

    Biorxiv : the Preprint Server for Biology
    |December 23, 2024
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    Summary
    This summary is machine-generated.

    Cell types evolve at different rates, with immune cells like neutrophils and B cells showing faster evolution in their characteristic genes compared to other cell types. This study merges single-cell RNA sequencing with evolutionary genomics.

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    Area of Science:

    • Evolutionary genomics
    • Cell biology
    • Population genetics

    Background:

    • Evolutionary rates vary significantly across genes.
    • Some gene categories are highly conserved, while others show rapid divergence due to selection.
    • Understanding cell-type-specific evolutionary dynamics is crucial.

    Purpose of the Study:

    • To investigate whether distinct cell types exhibit differential rates of evolutionary divergence.
    • To explore the relationship between cell type identity and the evolution of characteristic genes.
    • To integrate single-cell RNA sequencing with population genomic data.

    Main Methods:

    • Utilized single-cell RNA sequencing (scRNAseq) data.
    • Integrated scRNAseq with population genomic data (FST and dN/dS ratios).
    • Analyzed allele frequency divergence and interspecies divergence for cell-type-specific genes.

    Main Results:

    • Cell types demonstrate varying evolutionary rates in their characteristic genes.
    • Neutrophils, B cells, and fibroblasts showed elevated FST at characteristic genes.
    • Immune cell-associated genes exhibited significantly faster evolution compared to non-immune genes.

    Conclusions:

    • Genes defining immune cell types evolve more rapidly.
    • The integration of scRNAseq and evolutionary genomics provides novel insights into cell type evolution.
    • Cellular identity is linked to distinct evolutionary trajectories.