Equine transcriptome quantification using human GeneChip arrays can be improved using genomic DNA hybridisation and probe selection.

The research focuses on the application of a genomic DNA-based probe selection method using GeneChip arrays to effectively study the equine transcriptome. More than 29,000 transcripts were detected, revealing expected gene categories within the given tissues, and enabling the correlation of gene expression with tissue phenotypes and functions.

Background

• The research paper concentrates on the use of GeneChip arrays made by Affymetrix to profile transcriptomes in various species.
• The transcriptome constitutes all the RNA molecules, including mRNA, rRNA, tRNA, and other non-coding RNA expressed from the genes of an organism.
• The novel approach which the researchers have taken involves the use of genomic DNA (gDNA) in probe selection to expand the applicability of GeneChips.

Probe Selection and Experimentation

• This study explains how gDNA-based probe selection was used on the Affymetrix U133+2 GeneChip array to probe the equine transcriptome, an area that has not garnered ample attention in earlier investigations.
• With this method, the scientists were able to discover over 29,000 transcripts in equine brain and liver tissues, and in primary cultures of equine articular chondrocytes (a type of cells found in cartilage).

Gene Ontology Analysis

• Using gene ontology analysis on the differentially expressed genes from the different tissues, predictable categories within each type were identified.
• The gene ontology analysis is used for the unified representation of gene and gene product attributes across all species.
• These categories further validated the efficiency of using a human chip for equine transcriptome study.

Correlation between Gene Expression and Functions

• The study effectively unveiled a correlation between the levels of gene expression and the phenotypes and specialised functions of each tested tissue.
• This correlation enhances the understanding of the specialized roles these genes play in tissue-specific processing.

Conclusions

• Overall, the research findings indicated that it is feasible to use probe selection on a human chip to examine the equine transcriptome.
• This advancement unfolds the possibility of extending transcriptome studies to a broader range of species that have been comparatively under-observed in previous research.