Genetic association study in myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) identifies several potential risk loci.

Observed Findings

• The TPPP gene region showed the strongest association signal in the Norwegian discovery cohort (rs115523291, P=8.5×10⁻⁷), though the top SNP did not replicate independently.
• Multiple SNPs in TPPP showed modest association signals consistently across Norwegian discovery and UK Biobank cohorts.
• Combined analysis of Norwegian and UK Biobank cohorts showed TPPP association at rs139264145 (P=0.00004).
• No ME/CFS genetic variants reached genome-wide significance threshold in any individual cohort.
• TPPP gene is expressed in brain tissues, suggesting potential biological relevance to ME/CFS neurological symptoms.

Inferred Conclusions

• Despite being the largest ME/CFS GWAS to date, the study could not establish definitive genome-wide significant risk loci, indicating larger sample sizes are necessary.
• The TPPP gene shows promise as a candidate for future investigation based on consistent modest associations across multiple cohorts.
• Current sample sizes and diagnostic heterogeneity limit the statistical power to detect true ME/CFS genetic risk variants.
• Future large-scale studies accumulating data will be essential to reach the statistical threshold needed for establishing causal genetic associations.

Remaining Questions