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Genome Annotation and Assembly

The genome refers to all of the genetic material in an organism. It can range from a few million base pairs in microbial cells to several billion base pairs in many eukaryotic organisms. Genome assembly refers to the process of taking the DNA sequencing data and putting it all back together in a correct order to create a close representation of the original genome. This is followed by the identification of functional elements on the newly assembled genome, a process called genome annotation.
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tRNADB-CE: tRNA gene database curated manually by experts.

Takashi Abe1, Toshimichi Ikemura, Yasuo Ohara

  • 1Nagahama Institute of Bio-Science and Technology, Nagahama, Shiga, Japan. takaabe@nagahama-i-bio.ac.jp

Nucleic Acids Research
|October 10, 2008
PubMed
Summary

Researchers created tRNADB-CE, a comprehensive database of transfer RNA (tRNA) genes, by analyzing prokaryotic genomes and metagenomic data. This new resource significantly expands the known catalog of tRNA genes, offering valuable insights into their function and distribution.

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Area of Science:

  • Genomics
  • Bioinformatics
  • Molecular Biology

Background:

  • Transfer RNA (tRNA) genes are crucial for protein synthesis.
  • Existing databases lacked comprehensive tRNA gene information, especially from metagenomic data.
  • Accurate identification of tRNA genes is essential for understanding genome function.

Purpose of the Study:

  • To construct a large-scale, accurate database of tRNA genes from diverse prokaryotic and metagenomic sources.
  • To improve the completeness and reliability of tRNA gene identification.
  • To provide a freely accessible resource for researchers studying tRNA genes.

Main Methods:

  • Analysis of 534 complete prokaryotic genomes and 394 draft genomes (Whole Genome Shotgun).
  • Integration of approximately 6.2 million DNA sequences from metagenomic analyses.
  • Utilized three computational programs for tRNA gene prediction, with manual verification for discrepancies.
  • Developed the 'tRNADB-CE' database for browsing sequence, structure, and genomic context.

Main Results:

  • Registered 144,061 tRNA genes, over four times the number in previous databases.
  • Achieved high accuracy through multi-program analysis and expert manual curation.
  • The database allows detailed exploration of tRNA gene information, including anticodon counts, codon usage, and genomic positioning.

Conclusions:

  • tRNADB-CE is a significantly expanded and validated resource for prokaryotic tRNA genes.
  • The database facilitates in-depth analysis of tRNA gene diversity and genomic organization.
  • Provides a valuable tool for research in genomics, evolution, and molecular biology.