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Related Concept Videos

Genomic DNA in Eukaryotes00:58

Genomic DNA in Eukaryotes

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Eukaryotes have large genomes compared to prokaryotes. To fit their genomes into a cell, eukaryotic DNA is packaged extraordinarily tightly inside the nucleus. To achieve this, DNA is tightly wound around proteins called histones, which are packaged into nucleosomes that are joined by linker DNA and coil into chromatin fibers. Additional fibrous proteins further compact the chromatin, which is recognizable as chromosomes during certain phases of cell division.
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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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In eukaryotic cells, DNA replication is highly conserved and tightly regulated. Multiple linear chromosomes must be duplicated with high fidelity before cell division, so there are many proteins that fulfill specialized roles in the replication process. Replication occurs in three phases: initiation, elongation, and termination, and ends with two complete sets of chromosomes in the nucleus.
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Repbase Update, a database of repetitive elements in eukaryotic genomes.

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Repbase Update (RU) is a vital database for eukaryotic genome analysis, providing curated repeat sequences. Recent updates focus on improving data submission and usage, encouraging community contributions.

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Area of Science:

  • Genomics
  • Bioinformatics
  • Molecular Biology

Background:

  • Repbase Update (RU) has been a foundational resource for eukaryotic genome analysis since 1992.
  • It serves as a well-curated reference database for repetitive sequences.

Purpose of the Study:

  • To introduce recent updates to the Repbase Update (RU) database.
  • To detail technical improvements in submitting and updating Repbase entries.
  • To provide examples of utilizing RU data in genomic research.

Main Methods:

  • Database curation and updates.
  • Development of improved submission protocols.
  • Illustrative examples of data application.

Main Results:

  • Enhanced functionality for Repbase entry submission and updates.
  • Demonstrated utility of RU data through practical examples.
  • Increased accessibility and usability of the Repbase database.

Conclusions:

  • Repbase Update (RU) continues to evolve as an essential resource for genomic studies.
  • Improvements in data management facilitate broader community engagement.
  • Encouraging submissions will further enrich the database for future research.