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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.
In contrast, regions which code...
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.
In contrast, regions which code...
Gene Duplication and Divergence02:37

Gene Duplication and Divergence

The seminal work of Ohno in 1970 popularized the idea of gene duplication and divergence. DNA sequence comparison studies reveal that a large portion of the genes in bacteria, archaebacteria, and eukaryotes was  generated by gene duplication and divergence, indicating its critical role in evolution.
The duplicated copies of the gene are called Paralogs. Paralogs with similar sequences and functions form a gene family. Across several species, a large number of gene families are characterized.
Gene Families01:57

Gene Families

Gene families consist of groups of genes proposed to have originated from a common ancestor. Typically these arise through events in which a gene or genes are mistakenly duplicated during cell division. Unlike their parent genes (which are subject to selection pressure to maintain function), these gene copies do not need to preserve their sequences and may evolve at a relatively faster rate.
Occasionally these regions can be adapted to take on new roles within the organism, becoming novel genes...
Genome Size and the Evolution of New Genes03:21

Genome Size and the Evolution of New Genes

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.
Genome Size and the Evolution of New Genes03:21

Genome Size and the Evolution of New Genes

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.

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Related Experiment Video

Updated: Jun 19, 2026

Measurement of Poly A Tail Length from Drosophila Larva Brain and Cell Line
08:16

Measurement of Poly A Tail Length from Drosophila Larva Brain and Cell Line

Published on: January 12, 2024

Strong association between pseudogenization mechanisms and gene sequence length.

Amit N Khachane1, Paul M Harrison

  • 1Department of Biology, McGill University, Stewart Biology Building, Montreal, QC, H3A 1B1, Canada. amit.khachane@mail.mcgill.ca

Biology Direct
|October 8, 2009
PubMed
Summary
This summary is machine-generated.

Longer protein-coding genes generate more nonprocessed pseudogenes, while shorter genes favor processed pseudogenes. Genes over 3000 bp are six times more likely to form nonprocessed pseudogenes.

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Area of Science:

  • Genomics
  • Molecular Biology
  • Evolutionary Genetics

Background:

  • Pseudogenes are non-functional gene copies that arise from duplication events.
  • Two main types exist: processed pseudogenes (RNA-mediated) and nonprocessed pseudogenes (DNA-mediated).

Purpose of the Study:

  • To investigate the relationship between protein-coding gene length and pseudogene type formation.
  • To determine if gene length influences the propensity to form processed versus nonprocessed pseudogenes.

Main Methods:

  • Comparative analysis of gene length and pseudogene formation.
  • Statistical evaluation of pseudogene type prevalence based on gene length.

Main Results:

  • Protein-coding genes longer than 3000 base pairs (bp) are significantly more likely to produce nonprocessed pseudogenes.
  • Shorter genes show a higher tendency to produce processed pseudogenes.
  • Genes exceeding 3000 bp are 6 times more likely to yield nonprocessed pseudogenes compared to processed ones.

Conclusions:

  • Gene length is a critical factor differentiating the formation pathways of processed and nonprocessed pseudogenes.
  • The findings provide insights into the evolutionary dynamics and mechanisms governing pseudogene generation.