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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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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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DNA-only transposons are called autonomous transposons since they code for the enzyme transposase that is required for the transposition mechanism. Insertion of transposons can alter gene functions in multiple ways. They can mutate the gene, alter gene expression by introducing a novel promoter or insulator sequence, introduce new splice sites, and change the mRNA transcripts produced, or remodel chromatin structure.
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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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Retroviruses have a single-stranded RNA genome that undergoes a special form of replication. Once the retrovirus has entered the host cell, an enzyme called reverse transcriptase synthesizes double-stranded DNA from the retroviral RNA genome. This DNA copy of the genome is then integrated into the host’s genome inside the nucleus via an enzyme called integrase. Consequently, the retroviral genome is transcribed into RNA whenever the host’s genome is transcribed, allowing the...
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Mouse retrotransposons: sequence structure, evolutionary age, genomic distribution and function.

Masaki Kawase1, Kenji Ichiyanagi1

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Retrotransposons, mobile genetic elements, significantly impact mammalian genomes. This study details Mus-specific retrotransposons, crucial for genomic and epigenomic research.

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Area of Science:

  • Genomics
  • Molecular Biology
  • Evolutionary Biology

Background:

  • Retrotransposons are mobile genetic elements comprising ~40% of mammalian genomes.
  • They influence gene expression, chromatin organization, development, and disease.
  • Organisms possess unique retrotransposon subfamilies, like those in Mus (mice).

Purpose of the Study:

  • To characterize Mus-specific retrotransposon subfamilies.
  • To provide foundational data for genomic and epigenomic studies.

Main Methods:

  • Sequence structure analysis
  • Phylogenetic relationship assessment
  • Evolutionary age determination
  • Chromatin compartment preference (A/B compartments) analysis

Main Results:

  • Detailed characterization of Mus-specific retrotransposon subfamilies.
  • Insights into their evolutionary history and genomic distribution.
  • Understanding their association with specific chromatin compartments.

Conclusions:

  • Mus-specific retrotransposons exhibit diverse characteristics.
  • This subfamily-level data is essential for ongoing genomic research.
  • Retrotransposon diversity drives evolutionary innovation.