A trichostatin A expression signature identified by TempO-Seq targeted whole transcriptome profiling

Area of Science:

• Transcriptomics
• Molecular Biology
• Genomics

Background:

• Gene expression profiling is vital for compound classification, efficacy, and toxicity assessment.
• Accurate identification of modulated genes is key to sensitive expression assays.
• Existing methods may lack the sensitivity or breadth to capture comprehensive compound signatures.

Purpose of the Study:

• To evaluate the novel TempO-Seq assay for identifying previously unreported compound-responsive genes.
• To determine if TempO-Seq can generate broad, specific compound signatures.
• To assess the sensitivity and specificity of TempO-Seq in detecting differential gene expression.

Main Methods:

• Utilized TempO-Seq, a ligation-based targeted whole transcriptome expression profiling assay.
• Derived whole transcriptome profiles from MCF-7 cells treated with Trichostatin A (TSA).
• Compared TempO-Seq data with existing datasets (RNA-Seq, cMAP) for validation.

Main Results:

• TempO-Seq demonstrated high specificity (99.6%) and sensitivity, correlating well with RNA-Seq (R2=0.9).
• Identified over 9,000 differentially expressed genes in TSA-treated MCF-7 cells.
• Discovered a cell-independent TSA signature, including novel responsive genes, consistent across multiple cell types.

Conclusions:

• TempO-Seq effectively identifies sensitive, cell-independent gene expression signatures.
• The assay reveals novel compound-responsive genes missed by previous methods.
• TempO-Seq offers a sensitive and unbiased approach for defining compound-specific transcriptomic changes.