Methylenetetrahydrofolate Reductase CpG Islands: Epigenotyping

Area of Science:

• Epigenetics
• Molecular Biology
• Genetics

Background:

• Understanding methylenetetrahydrofolate reductase (MTHFR) DNA methylation is crucial for ischemic stroke pathogenesis.
• No prior data existed on MTHFR DNA methylation profiles in Kelantanese Malays.
• A rapid and efficient assay was needed to analyze MTHFR DNA methylation.

Purpose of the Study:

• To develop and validate a serial pyrosequencing assay for MTHFR DNA methylation analysis.
• To determine the differential DNA methylation profiles of MTHFR in Kelantanese Malays.
• To validate previous computational epigenetic research on MTHFR.

Main Methods:

• Designed and validated polymerase chain reaction primers for MTHFR cytosine-guanine (CpG) sites A and B regions.
• Utilized serial pyrosequencing assays on 110 Kelantanese Malays.
• Validated the assay using five controls and calculated mean DNA methylation profiles.

Main Results:

• The assay successfully generated high-quality pyrograms for DNA methylation analysis.
• Mean DNA methylation levels for MTHFR CpGs A and B were 0.984 ± 0.582 and 2.456 ± 1.406.
• CpG sites 8 and 20 exhibited the highest and lowest methylation levels, respectively.

Conclusions:

• A fast, high-throughput pyrosequencing assay for MTHFR DNA methylation analysis was successfully developed and validated.
• The assay enabled the determination of MTHFR DNA methylation profiles in 110 Kelantanese Malays.
• The study validated prior computational epigenetic findings on MTHFR.