CAGE™ Library Preparation & Analysis : Technology Overview
□ Technical Information
CAGE is an unique approach for identifying promoters and gene expression profiling.
Based on our full-length cDNA library technology, where an adaptor is ligated to the 5’ end Cap site of each full-length cDNA, CAGE proves comprehensive collection of 5' end tags. By high-throughput CAGE sequencing reads . and mapping them onto genomic sequences, transcriptional start sites can be identified. Thus, CAGE can be a powerful tool for discovery of novel genes, genome-wide gene-expression profiling, and promoter analysis.
□Comparison with other gene expression analysis techniques
There are numerous techniques for analyzing gene expression, and each method has its advantages. CAGE differs from other major gene expression analysis techniques in its capability to accurately identify transcriptional start sites in a genome-wide fashion.
Since CAGE enables detailed analyses of the promoter regions of a gene, it is possible to further analyze the expression of a specific gene regulated by each promoter. Therefore, CAGE can serve as a “new-perspective” approach for genome annotation, by elucidating transcriptional signaling cascades, and performing other functions.
CAGE | RNA-seq | SAGE | Microarray | |
---|---|---|---|---|
de novo Gene Finding | good | good | good | N/A |
Gene Expression Quantification |
superior ※ free of PCR bias unaffected by gene size |
good | good | average |
Determining Promoter Site | superior | average | N/A | N/A |
Motif Finding for Transcription Factor Binding Site | superior | average |
average ※ depending on known 5' end sequence information |
average ※ depending on known 5' end sequence information |
Identification of Bidirectional Enhancer RNA | superior | N/A | N/A | N/A |
Determining Transcription Start/1st Exon Site | superior | average | N/A | N/A |
Determining Gene Structure (intron/exon, alternative splicing variants) | N/A |
average ※ depending on sequence depth |
N/A | N/A |
Duration of Work Process | average | average | average | good |
Library Preparation Complicatedness | ※Long Time (8 days) | average | average | easy |
Data Analysis Tools | average | good | average | good |
("N/A" means not applicable)
□ References
□FANTOM Main Paper
□Others
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