Methylome and transcriptome data integration reveals aberrantly regulated genes in equine sarcoids.

This research examined how altered DNA methylation—a crucial factor in gene expression—could be impacting and regulating genes related to horse sarcoids, a common type of equine skin tumor. This was done via comprehensive DNA methylation sequencing and gene expression profiling, revealing abnormally regulated genes and pathways that may be related to the tumors’ progress and development.

Methodology

• The study employed a dual-method approach combining both Reduced Representation Bisulfite Sequencing (RRBS) and RNA Sequencing (RNA-Seq). The RRBS was used to sequence the whole genome DNA methylation (methylome), while the RNA-Seq helped in profiling the gene expression (transcriptome).
• The researchers chose to study both lesion samples and control samples to compare the differences in DNA methylation patterns.
• The DNA methylation is observed in the context of CpG (regions where a cytosine nucleotide is followed by a guanine nucleotide), which is a significant region for the methylation process.

Findings

• Findings revealed a lower DNA methylation level in lesion samples when compared to controls.
• From these samples, 14,692 differentially methylated sites (DMSs) within the CpG context and 11,712 differentially expressed genes (DEGs) were identified.
• By integrating and comparing the data from the methylome and the transcriptome, the study identified 493 genes whose expression was deregulated due to abnormal DNA methylation in equine sarcoid.

Implications and Conclusions

• The research brings to light various molecular pathways linked with extracellular matrix (ECM), oxidative phosphorylation (OXPHOS), immune response, and disease processes that are triggered due to the aberrant methylation. These pathways can be crucial for understanding the progression and development of the tumor.
• This study benefits the larger scientific community by providing valuable insights into the epigenetic changes undergone in equine sarcoids, a common health issue among horses.
• The results can be harnessed as a valuable resource for future studies to develop biomarkers for detecting susceptibility to equine sarcoids.