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LTR retrotransposons are class I transposable elements with long terminal repeats flanking an internal coding region. These elements are less abundant in mammals compared to other class I transposable elements. About 8 percent of human genomic DNA comprises LTR retrotransposons. Some of the common examples of LTR retrotransposons are Ty elements in yeast and Copia elements in Drosophila.
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As the name suggests, non-LTR retrotransposons lack the long terminal repeats characteristic of the LTR retrotransposons. Additionally, both LTR and non-LTR retrotransposons use distinct mechanisms of mobilization. Non-LTR retrotransposons are further divided into two classes - Long interspersed nuclear elements (LINEs) and short interspersed nuclear elements (SINEs), both of which occur abundantly in most mammals, including humans. Some of the active non-LTR retrotransposons in humans are L1...
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The evolution of new genes is critical for speciation. Exon recombination, also known as exon shuffling or domain shuffling, is an important means of new gene formation. It is observed across vertebrates, invertebrates, and in some plants such as potatoes and sunflowers. During exon recombination, exons from the same or different genes recombine and produce new exon-intron combinations, which might evolve into new genes. 
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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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Transposons make up a significant part of genomes of various organisms. Therefore, it is believed that transposition played a major evolutionary role in speciation by changing genome sizes and modifying gene expression patterns. For example, in bacteria, transposition can lead to conferring antibiotic resistance. Movement of transposable elements within the genetic pool of pathogenic bacteria can aid in transfer of antibiotic-resistant genetic elements. In eukaryotes, transposons can carry out...
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Transposons, or "jumping genes," are small mobile genetic elements (MGEs) that range from 700 to 40,000 base pairs in length. They are found in all organisms and can move within the same chromosome or transfer to different chromosomes. In some cases, transposons can also jump between different host DNA molecules, such as plasmids or viruses, contributing to genetic variability.Barbara McClintock first discovered these mobile genetic elements in the 1940s while studying maize genetics, and she...
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Reverse transcriptase and intron number evolution.

Kemin Zhou1, Alan Kuo1, Igor V Grigoriev1

  • 11 Computational Genomics, Bristol-Myers Squibb, 311 Pennington Rocky Hill Road, Pennington, NJ 08534, USA ; 2 US Department of Energy Joint Genome Institute, 2800 Mitchell Drive, Walnut Creek, CA 94598, USA.

Stem Cell Investigation
|July 1, 2016
PubMed
Summary
This summary is machine-generated.

Eukaryotic genomes experienced significant intron loss early in evolution, with reverse transcriptase activity shaping exon-intron structure. Species-specific genes show distinct characteristics compared to conserved genes.

Keywords:
Intron gain and lossfungal ancestorgenome sizereverse transcriptase (RT)

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Area of Science:

  • Genomics
  • Evolutionary Biology
  • Molecular Biology

Background:

  • Introns are crucial in eukaryotic genomes, influencing gene regulation, mRNA processing, and evolution.
  • Their roles span transcriptional control, mRNA export, quality control, and exon shuffling.

Purpose of the Study:

  • To investigate the evolutionary history of intron loss in eukaryotes.
  • To understand the role of reverse transcriptase (RT)-mediated intron loss in shaping eukaryotic genomes.
  • To compare intron-exon structures in conserved versus species-specific genes.

Main Methods:

  • Comparative genomic analysis of 16 fungal genomes.
  • Simulation of reverse transcriptase (RT)-mediated intron loss.
  • Analysis of relative intron location (RIL) to trace intron loss.
  • Examination of exon length distribution and gene conservation.

Main Results:

  • The last common ancestor of eukaryotes (LECA) had an estimated 6.4 to 7.7 exons per gene (EPG).
  • RT-mediated intron loss was identified as a major driver of genomic evolution, with RIL accurately tracking this process.
  • Ancient exon lengths and protein module sizes suggest an early eukaryotic ancestor with approximately 16 EPG.
  • Species-specific genes exhibit higher exon density, shorter exons, and longer introns than conserved genes, though intron length decreases after significant loss.

Conclusions:

  • Significant intron loss occurred during early eukaryotic evolution.
  • De novo gene birth contributes to the distinct genomic features of species-specific genes.