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Related Concept Videos

Genomic DNA in Eukaryotes00:58

Genomic DNA in Eukaryotes

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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Phylogeny

Phylogeny is concerned with the evolutionary diversification of organisms or groups of organisms. A group of organisms with a name is called a taxon (singular). Taxa (plural) can span different levels of the evolutionary hierarchy. For instance, the group containing all birds is a taxon (comprising the class Aves), and the group of all species of daisies (the genus Bellis) is a taxon. Phylogenies can likewise include just one genus (i.e., depict species relationships) or span an entire kingdom.
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The “tree of life” describes the evolution of life and the evolutionary relationships between organisms. The root of the tree is the common ancestor to all life on Earth. All other species radiate from this point, much like the branches of a tree. The numerous tips of these branches on the tree of life represent every living, or extant, species. Extinct species, which are species that no longer exist, can be found towards the center of the tree. Currently, these organisms, both extant and...
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Diversity of Protists I01:15

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Excavata is a diverse group of protists that includes both chemoorganotrophic and phototrophic species, with some thriving in anaerobic environments. Among the key groups within Excavata are diplomonads and parabasalids, which are flagellated protists that lack mitochondria and chloroplasts. These microorganisms typically inhabit anoxic environments, such as the intestines of animals, where they exist either symbiotically or as parasites, relying on fermentation for energy production. Some...
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Genomic Diversity in Bacteria
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Updated: May 23, 2026

Navigating MARRVEL, a Web-Based Tool that Integrates Human Genomics and Model Organism Genetics Information
09:37

Navigating MARRVEL, a Web-Based Tool that Integrates Human Genomics and Model Organism Genetics Information

Published on: August 15, 2019

Tetrahymena Genome Database Wiki: a community-maintained model organism database.

Nicholas A Stover1, Ravinder S Punia, Michael S Bowen

  • 1Department of Biology, Bradley University, Peoria, Illinois 61625, USA. nstover@bradley.edu

Database : the Journal of Biological Databases and Curation
|March 22, 2012
PubMed
Summary

The Tetrahymena Genome Database (TGD) has been restored and updated as TGD Wiki. This community-driven resource empowers researchers to directly update gene information, ensuring a dynamic and accurate Tetrahymena bioinformatics platform.

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Published on: January 8, 2015

Area of Science:

  • Bioinformatics
  • Computational Biology
  • Genomics

Background:

  • The Tetrahymena Genome Database (TGD), a crucial resource, ceased updates in 2006 and went offline in 2008.
  • This discontinuation left a significant gap for the Tetrahymena research community.

Purpose of the Study:

  • To restore and update the Tetrahymena Genome Database.
  • To retool the database into an interactive platform (TGD Wiki) for community-driven updates.
  • To facilitate ongoing maintenance of Tetrahymena genome annotations.

Main Methods:

  • Restoration and updating of the existing TGD database.
  • Transitioning the TGD website to a wiki format (TGD Wiki).
  • Implementing web-based tools for direct community input on gene information (names, descriptions, Gene Ontology annotations).

Main Results:

  • The TGD has been successfully restored and updated.
  • The TGD Wiki is now operational, allowing direct community contributions.
  • A model for community-based genome annotation maintenance is demonstrated.

Conclusions:

  • Community-driven updates by primary data authors are a viable strategy for maintaining genome databases, especially for smaller research communities.
  • TGD Wiki enhances accessibility and participation for bench scientists in bioinformatics resource development.
  • The restored TGD Wiki serves as a vital, up-to-date resource for Tetrahymena research.