TBL2 methylation is associated with hyper-low-density lipoprotein cholesterolemia: a case-control study

Area of Science:

• Molecular biology
• Epigenetics
• Lipid metabolism

Background:

• Genes such as HMGCR, SCAP, SREBF1, SREBF2, and TBL2 play roles in lipid metabolism.
• The association between epigenetic modifications, specifically DNA methylation, and lipid metabolism, particularly hyper-low-density lipoprotein cholesterolemia (hyper-LDL), remains largely unexplored.

Purpose of the Study:

• To investigate the relationship between DNA methylation levels of key lipid metabolism genes (HMGCR, SCAP, SREBF1, SREBF2, TBL2) and the risk of hyper-LDL.
• To determine if epigenetic changes in these genes are associated with hyper-LDL development.

Main Methods:

• A case-control study design was employed.
• DNA methylation levels were quantified across 231 CpG sites within the promoter regions of HMGCR, SCAP, SREBF1, SREBF2, and TBL2.
• Analysis was conducted on samples from 98 individuals with hyper-LDL and 89 control participants without hypo-LDL.

Main Results:

• A statistically significant difference in methylation levels was observed for the TBL2 gene between hyper-LDL patients and controls (P = 0.004).
• Specifically, patients with hyper-LDL exhibited lower methylation levels in the TBL2 gene compared to controls.
• Several specific methylation haplotypes within the TBL2 gene showed significant abundance differences between the groups.

Conclusions:

• The study provides evidence that participants with hyper-LDL have reduced methylation of the TBL2 gene.
• These findings suggest that DNA methylation of the TBL2 gene may play a protective role, potentially decreasing the risk for hyper-LDL in humans.