The results are significant: between 2020 and 2024, Long COVID and ME/CFS cost Germany more than €250 billion. In 2024 alone, Long COVID and ME/CFS cost Germany €63.1 billion, equating to 1.5% of the ...

YouTube video by Crafting Through It

YouTube video by Crafting Through It

YouTube video by Crafting Through It

YouTube video by Crafting Through It

YouTube video by Crafting Through It

Listen to this article Researcher Dr Douglas Barrett PhD student Anosha Altaf Institution School of Psychology and Vision Sciences, Leicester University, UK Start date October 2023 Funding ME Research...

Researcher Dr Alkisti Manousaki Supervisors Dr Yolanda Markaki and Dr Rachel Evans Institution University of Leicester Start date August 2025 Funding This project forms the basis of a Daphne Jackson T...

This comprehensive research review outlines the key biological changes that […]

YouTube video by Crafting Through It

YouTube video by Crafting Through It

YouTube video by Crafting Through It

YouTube video by Crafting Through It

Background Myalgic encephalomyelitis (ME) is a chronic, multisystem illness characterized by post-exertional malaise (PEM) and cognitive dysfunction, yet the molecular mechanisms driving these hallmark symptoms remain unclear. This study investigated haptoglobin (Hp) as a potential biomarker of PEM severity and cognitive impairment in ME, with a focus on Hp phenotypes and structural proteoforms. Methods A longitudinal case–control study was conducted in 140 ME patients and 44 matched sedentary healthy controls. In the discovery phase, global plasma proteomic profiling was performed in 61 ME patients and 20 controls before and after a standardized, non-invasive stress protocol in order to induce PEM. Associations between Hp levels, phenotype, and cognitive performance were assessed. In the validation phase, plasma Hp concentrations and proteoform composition were analyzed in an independent cohort of 89 ME patients and 24 controls using high-performance liquid chromatography (HPLC). Results ME patients demonstrated a significant reduction in Hp levels following post-exertional stress. Lower baseline Hp concentrations were associated with impaired cognitive performance. Hp phenotypes were differentially associated with symptom burden, with the Hp2-1 phenotype enriched in ME and linked to greater PEM severity and cognitive deficits compared to Hp1-1 and Hp2-2. HPLC analysis revealed altered Hp proteoform profiles in the Hp2-1 subgroup, including increased high-mass tetrameric and pentameric forms and shorter retention times indicative of structural changes. In contrast, the Hp1-1 phenotype was associated with milder symptoms and greater cognitive resilience. Conclusions These findings suggest that Hp phenotype and proteoform structure modulate the physiological response to post-exertion in ME, offering insight into the molecular basis of PEM and its clinical heterogeneity. Hp may serve as a translational biomarker for patient stratification and a potential therapeutic target to mitigate oxidative stress and cognitive dysfunction in ME.

Madeleine Finlay speaks to science editor Ian Sample about a new study of how genes affect people’s chances of developing ME/CFS, and to Nicky Proctor who has ME and took part in the research. She als...

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