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Generation, annotation, evolutionary analysis, and database integration of 20,000 unique sea urchin EST clusters
Albert J Poustka1, Detlef Groth, Steffen Hennig
1Evolution and Development Group, Max Planck Institute for Molecular Genetics, Department of Vertebrate Genomics, 14195 Berlin, Germany. poustka@molgen.mpg.de
Genome Research
|December 6, 2003
Summary
Sea urchins are key to understanding bilaterian evolution. This study identified 20,000 unique genes in sea urchin development, revealing ancient gene origins and a stable genome structure.
Area of Science:
- Developmental Biology
- Evolutionary Biology
- Genomics
Background:
- Sea urchins are basal deuterostomes crucial for studying bilaterian evolution.
- Their embryos are excellent models for analyzing genomic regulatory networks in development.
Purpose of the Study:
- To create a comprehensive catalog of genes involved in sea urchin development.
- To investigate the evolutionary origins of genes and genome structure in deuterostomes.
Main Methods:
- Analysis of 107,283 cDNA clones from sea urchin (Strongylocentrotus purpuratus) developmental libraries.
- Normalization using oligonucleotide fingerprinting, EST sequencing, and sequence clustering.
- Phylogenetic comparison with urochordate (Ciona intestinalis) and other deuterostome genomes.
Main Results:
- Generated an EST catalog of 20,000 unique genes/fragments, with 7000 linked to molecular and developmental functions.
- Identified that at least 25% of putatively chordate-specific genes existed at the base of deuterostome evolution.
- Sea urchin genome shows no evidence of extensive gene or whole-genome duplications compared to chordates.
Conclusions:
- The unique gene set is vital for annotating the upcoming sea urchin genome sequence.
- This research provides insights into the early evolution of deuterostome genomes.
- Sea urchins offer a valuable system for comparative genomics and evolutionary developmental biology.