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Ciona intestinalis cDNA projects: expressed sequence tag analyses and gene expression profiles during embryogenesis
Yutaka Satou1, Naohito Takatori, Shigeki Fujiwara
1Department of Zoology, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan.
Gene
|May 7, 2002
Summary
This study analyzes gene expression in Ciona intestinalis, a primitive chordate, revealing molecular markers for its simplified body plan development. The findings aid comparative genomics and understanding early chordate evolution.
Area of Science:
- Developmental Biology
- Genomics
- Evolutionary Biology
Background:
- Ascidians represent primitive chordates with a simplified body plan.
- Ascidian tadpole larvae exhibit a basic chordate body structure.
- Ciona intestinalis has a compact genome (~160 Mb) with approximately 15,500 genes.
Purpose of the Study:
- To profile gene expression across various developmental stages of Ciona intestinalis.
- To identify novel molecular markers for tissues and organs in ascidian embryos.
- To facilitate comparative genomics for understanding primitive chordate body plan formation.
Main Methods:
- Expressed Sequence Tags (ESTs) generated from over 3000 cDNA clones.
- Cluster analysis of ESTs using 3'-end sequences.
- BLASTX searches for sequence similarity analysis of gene clusters.
- Whole-mount in situ hybridization to analyze gene expression patterns.
Main Results:
- Approximately 1000 gene clusters analyzed for sequence similarity.
- Half of the analyzed clusters showed similarity to known proteins; the other half did not.
- Identified numerous new molecular markers specific to Ciona tailbud embryo tissues/organs.
- Detailed gene expression profiles were mapped to developmental stages.
Conclusions:
- The study provides a comprehensive gene expression dataset for Ciona intestinalis development.
- Identified genes offer insights into the formation of the primitive chordate body plan.
- Data supports future comparative genomic studies on chordate evolution.