Multi-targeted priming for genome-wide gene expression assays.

Area of Science:

• Molecular Biology
• Genomics
• Transcriptomics

Background:

• Current gene expression assays have limitations in specific genomic regions.
• Reverse transcription typically uses oligo-dT or random hexamers for priming.
• Need for improved methods to assay global gene expression comprehensively.

Purpose of the Study:

• To design and validate novel multi-targeted primers for more accurate transcriptomic assays.
• To identify conserved sequence motifs in protein-coding genes for targeted priming.
• To assess the performance of these primers in yeast and fungal gene expression studies.

Main Methods:

• Algorithm development to identify common gene motifs in Saccharomyces cerevisiae and Neurospora crassa.
• Experimental validation of multi-targeted primers for reverse transcription.
• Application of primers in microarray and RNA sequencing for gene expression profiling.

Main Results:

• Discovery of two effective multi-targeted primers that prime most protein-coding genes while avoiding rRNA and tRNA.
• Demonstrated superior performance in microarray and RNA tag sequencing for yeast nitrogen deficiency and fungal sexual development.
• Achieved higher sensitivity, increased number of measured genes, and enhanced detection of expression differences.

Conclusions:

• Developed a novel multi-targeting priming methodology for genome-wide gene expression assays.
• Achieved the most complete expression profiles to date for yeast nitrogen starvation response and N. crassa sexual development.
• Methodology offers selective targeting and counter-selection for precise transcriptomic analysis.