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Evolutionary patterns of recently emerged animal duplogs.
Kiyoshi Ezawa1, Kazuho Ikeo, Takashi Gojobori
1Division of Population Genetics, National Institute of Genetics, Mishima, Japan.
Genome Biology and Evolution
|August 24, 2011
Summary
Intraspecies paralogs, known as duplogs, are key to genome innovation. A new "drift" duplication mechanism, distinct from known modes, generates these gene copies across animal evolution.
Area of Science:
- Genomics
- Evolutionary Biology
- Molecular Biology
Background:
- Intraspecies paralogs (duplogs) are crucial for functional innovation in eukaryotic genomes.
- Recent animal duplogs represent a significant portion of these genomic elements.
Purpose of the Study:
- To analyze recently emerged animal duplogs across multiple species.
- To identify shared characteristics and potential novel mechanisms of gene duplication.
Main Methods:
- Comparative genomic analysis of duplogs in Homo sapiens, Mus musculus, Danio rerio, Caenorhabditis elegans, Drosophila melanogaster, and D. pseudoobscura.
- Categorization of duplogs by synonymous distance (dS), physical distance, and relative orientation.
- Analysis of intrachromosomal multiexon duplogs.
Main Results:
- Inverted duplogs constitute 20-50% of intrachromosomal multiexon duplogs.
- Physical distances, relative orientations, and inversion proportions are largely uniform across species (except C. elegans).
- Youngest duplogs (dS < 0.01) share characteristics with the overall duplog set.
Conclusions:
- A novel gene duplication mode, termed "drift" duplication, is proposed.
- Drift duplication generates intrachromosomal duplogs with long physical distances simultaneously.
- This mechanism has been active since the vertebrate common ancestor and possibly earlier.
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