Genome-wide DNA methylation profiling in whole blood reveals epigenetic signatures associated with migraine

• Published in: BMC genomics Vol. 19; no. 1; pp. 69 - 10
• Main Authors: Gerring, Zachary F., McRae, Allan F., Montgomery, Grant W., Nyholt, Dale R.
• Format: Journal Article
• Language: English
• Published: London BioMed Central 22.01.2018; BioMed Central Ltd; BMC
• Subjects: Analysis; Animal Genetics and Genomics; Biomedical and Life Sciences; Blood; Development and progression; Differential; Genetic aspects; Human and rodent genomics; Life Sciences; Methylation; Microarrays; Microbial Genetics and Genomics; Migraine; Physiological aspects; Plant Genetics and Genomics; Proteomics; Research Article; Single nucleotide polymorphisms; Australia; Differential; Methylation; Migraine; Blood
• ISSN: 1471-2164; 1471-2164
• DOI: 10.1186/s12864-018-4450-2

Background Migraine is a common heritable neurovascular disorder typically characterised by episodic attacks of severe pulsating headache and nausea, often accompanied by visual, auditory or other sensory symptoms. Although genome-wide association studies have identified over 40 single nucleotide polymorphisms associated with migraine, there remains uncertainty about the casual genes involved in disease pathogenesis and how their function is regulated. Results We performed an epigenome-wide association study, quantifying genome-wide patterns of DNA methylation in 67 migraine cases and 67 controls with a matching age and sex distribution. Association analyses between migraine and methylation probe expression, after adjustment for cell type proportions, indicated an excess of small P values, but there was no significant single-probe association after correction for multiple testing ( P  < 1.09 × 10 − 7 ). However, utilising a 1 kb sliding window approach to combine adjacent migraine-methylation association P values, we identified 62 independent differentially methylated regions (DMRs) underlying migraine (false discovery rate < 0.05). Migraine association signals were subtle but consistent in effect direction across the length of each DMR. Subsequent analyses showed that the migraine-associated DMRs were enriched in regulatory elements of the genome and were in close proximity to genes involved in solute transportation and haemostasis. Conclusions This study represents the first genome-wide analysis of DNA methylation in migraine. We have identified DNA methylation in the whole blood of subjects associated with migraine, highlighting novel loci that provide insight into the biological pathways and mechanisms underlying migraine pathogenesis.