DNA Methylation Plays Key Role in Dairy Cows' Response to Heat Stress

Researchers at Beijing Jiaotong University have made significant discoveries regarding the molecular mechanism of heat stress response in dairy cows, with a particular focus on DNA methylation. The study, published in BMC Genomics, reveals that DNA methylation is closely associated with an animal's response to heat stress and identifies key genes involved in this process.

Key Takeaways:

• The research identified 49861 specific differentially methylated regions corresponding to 7613 differentially methylated genes between spring and summer dairy cows.
• Among these, 4069 promoter regions of differentially methylated genes were significantly enriched in key biological pathways such as substance transport, reactive oxygen species metabolism, signal transduction, and energy metabolism.
• A total of 157 genes were further screened, and their DNA methylation levels were negatively correlated with gene expression.
• The changes in DNLZ, GNAS, and SMAD5 genes were most significant, and network analysis showed that DNLZ gene has high connectivity in the protein-protein interaction network, indicating its potential key function in heat stress response.
• Experimental verification showed that under heat stress conditions, the methylation level of CpG islands in the promoter region of DNLZ gene significantly increases, and its methylation level is significantly negatively correlated with gene expression level.
• The study provides new insights into the mechanism of heat stress-related DNA methylation in dairy cows, clarifying the key roles of genes such as DNLZ.

Statistics:

• 49861: The number of specific differentially methylated regions identified in the study.
• 7613: The number of differentially methylated genes identified in the study.
• 4069: The number of promoter regions of differentially methylated genes significantly enriched in key biological pathways.
• 157: The number of genes further screened for their DNA methylation levels and gene expression correlation.
• 1-17: The page number range of the journal article "Molecular regulation of whole genome DNA methylation in heat stress response of dairy cows" in BMC Genomics.
• 2025: The year in which the study was conducted.

Sources:

• Molecular regulation of whole genome DNA methylation in heat stress response of dairy cows. BMC Genomics, 2025,26(1):1-17.
• Beijing Jiaotong University Researchers Yield New Study Findings on Genomics (Molecular regulation of whole genome DNA methylation in heat stress response of dairy cows). Life Science Weekly. May 27, 2025; p 515.