DNA methylation and stroke prognosis: an epigenome-wide association study.

Area of Science:

• Epigenetics
• Neuroscience
• Genomics

Background:

• Stroke is a primary cause of adult disability, with outcomes influenced by clinical factors and individual variability.
• Genetics and epigenetics, including DNA methylation (DNAm), may explain the variability in stroke prognosis.
• Understanding the epigenetic landscape post-stroke is crucial for improving patient outcomes.

Purpose of the Study:

• To investigate the association between DNA methylation patterns and stroke prognosis.
• To identify specific DNA methylation markers predictive of functional outcomes after ischemic stroke.
• To explore potential epigenetic mechanisms underlying stroke recovery.

Main Methods:

• A two-phase study involving discovery and replication cohorts of Caucasian ischemic stroke patients.
• DNA methylation analysis using 450K and EPIC BeadChips on whole-blood samples collected within 24 hours post-stroke.
• Epigenome-wide association study (EWAS) to identify differentially methylated positions (DMPs) and regions (DMRs) associated with poor functional outcome (modified Rankin Scale > 2 at 3 months).

Main Results:

• One replicated DMP (cg24391982) was identified, annotated to the thrombospondin-2 (THBS2) gene.
• Four differentially methylated regions (DMRs) were significantly associated with poor stroke outcome.
• These DMRs were annotated to zinc finger protein 57 homolog (ZFP57), Arachidonate 12-Lipoxygenase 12S Type (ALOX12), ABI Family Member 3 (ABI3), and Allantoicase (ALLC) genes.

Conclusions:

• A significant association exists between specific DNA methylation patterns and stroke outcomes.
• The identified DMP at THBS2 and DMRs in ZFP57, ALOX12, ABI3, and ALLC genes may serve as potential biomarkers for stroke prognosis.
• These findings suggest novel epigenetic mechanisms influencing stroke recovery and highlight avenues for future research.