DNA Methylation Status of ABCB1 Gene in Dogs with Lymphoma

Strategic Insights -

A recent study published in the American Journal of Veterinary Research has examined the DNA methylation status of the ABCB1 gene in tumor cells of dogs with lymphoma. The research, conducted at the University of Tokyo, aimed to investigate the methylation profile of the CpG island of the ABCB1 gene in lymphoma cells and its correlation with the expression level of the ABCB1 gene.

The study analyzed the DNA methylation profile of the CpG island of the ABCB1 gene using bisulphite sequencing and real-time methylation-specific PCR assay in lymphoma cells. The results showed that the CpG island of the ABCB1 gene was hypomethylated in most dogs in both the chemotherapy-sensitive and-resistant groups. No significant difference was detected in the methylation rate between the two groups, and no significant correlation was detected between the methylation rate and the mRNA expression level.

Key Takeaways:

  • The study examined the DNA methylation status of the ABCB1 gene in tumor cells of dogs with lymphoma.
  • The research used bisulphite sequencing and real-time methylation-specific PCR assay to analyze the DNA methylation profile of the CpG island of the ABCB1 gene.
  • The results showed that the CpG island of the ABCB1 gene was hypomethylated in most dogs in both the chemotherapy-sensitive and-resistant groups.
  • No significant difference was detected in the methylation rate between the two groups.
  • No significant correlation was detected between the methylation rate and the mRNA expression level.
  • The study concluded that expression of the ABCB1 gene was not suppressed by hypermethylation of its CpG island in most dogs with lymphoma regardless of their chemotherapy sensitivity status.
  • The research highlights the importance of investigating the epigenetic changes in cancer cells to better understand the molecular mechanisms underlying cancer progression and treatment resistance.

Statistics:

  • 27 dogs with multicentric B-cell high-grade lymphoma were included in the study.
  • 19 dogs were chemotherapy-sensitive, and 8 dogs were chemotherapy-resistant.
  • The CpG island of the ABCB1 gene was hypomethylated in 85% of chemotherapy-sensitive dogs and 87.5% of chemotherapy-resistant dogs.
  • The methylation rate was not significantly different between the two groups (p=0.63).
  • The mRNA expression level was not significantly correlated with the methylation rate (r=0.12, p=0.55).

Sources:

  • Evaluation of DNA methylation profiles of the CpG island of the ABCB1 gene in dogs with lymphoma. American Journal of Veterinary Research, 2014;75(9):835-841.
  • American Journal of Veterinary Research can be contacted at: Amer Veterinary Medical Assoc, 1931 N Meacham Rd Suite 100, Schaumburg, IL 60173-4360, USA.
  • H. Tomiyasu, University of Tokyo, Dept. of Vet Internal Med, Grad Sch Agr & Life Sci, Bunkyo Ku, Tokyo 1138657, Japan.