Novel Gene Evolution
Novel Gene Evolution - Related Videos
03:14
Assessing the Role of Gene Copy Number in the Evolution of Bacterial Antibiotic Resistance
0 Views •
2026
Source: Escudero, J. A., et.al. Testing the Role of Multicopy Plasmids in the Evolution of Antibiotic Resistance. J. Vis. Exp. (2018)This video demonstrates how escalating cefazidime exposure is used to compare the survival of three E. coli strains with different copies of the ampicillin resistance gene. It shows that only the strain with a multicopy plasmid survives at higher drug levels, highlighting how increased gene copy number accelerates resistance evolution.
03:21
Genome Size and the Evolution of New Genes
0 Views •
2020
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.
03:21
Genome Size and the Evolution of New Genes
0 Views •
2023
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.
02:05
Gene Evolution - Fast or Slow?
0 Views •
2020
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. In contrast, regions which code...
02:05
Gene Evolution - Fast or Slow?
0 Views •
2023
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. In contrast, regions which code...
FAQs
Duplication creates an additional copy that can accumulate sequence changes while the original copy continues its existing role. Over time, divergence between the copies may produce distinct functions or specialized activities. This process gives evolution a source of genetic redundancy, allowing one copy to change without necessarily eliminating the function maintained by the other.
A previously noncoding region can gradually acquire features that support transcription and translation, allowing it to produce a sequence with biological function. Changes in whether and when the region is expressed can then influence its evolutionary fate. This route shows that novel genetic material need not originate from an already established protein-coding gene.
Retention reflects the combined effects of natural selection, genetic drift, and changing expression patterns. Selection can favor a new gene when its activity contributes to an advantageous trait, whereas drift can alter its frequency without requiring a functional benefit. Expression changes also shape where or when the gene operates, influencing specialization.
Gene duplication begins with an extra copy of an existing gene, whereas DNA rearrangement changes the organization or combination of existing sequences. A noncoding region follows a different route by becoming transcribed and translated over time. Comparing these pathways helps distinguish whether a new gene reflects copied material, altered genomic structure, or newly functional sequence.
Comparative genomics examines genetic sequences across organisms to identify similarities, differences, and patterns consistent with distinct evolutionary histories. Researchers can use these comparisons to evaluate whether a gene relates to a duplicated sequence, a rearranged region, or a sequence that emerged from previously noncoding DNA. The resulting evidence places the gene in an evolutionary context.
Functional experiments test what a newly identified gene does rather than relying only on sequence comparisons. Together with comparative genomics, they can connect a gene's evolutionary origin to its biological function and changing expression patterns. This combination helps reveal how sequence changes become specialized activities and clarifies the consequences of acquiring a new genetic function.
Novel gene evolution helps explain how organisms acquire adaptations, develop new phenotypic traits, and diversify into different species. It also contributes to understanding differences in biological complexity by linking changes in genetic repertoires with functional innovation. In biology, this perspective connects genome change with the emergence of organismal differences across evolutionary time.