Original title: Clonal Haematopoiesis Tracks Alzheimer’s-like Cortical Atrophy in Community-Dwelling Older Adults
Suwanlikit Y, S.J.C. Crofts, J.E. Moodie, R.E. Marioni +8 · September 2026
As people grow older, mutated blood stem cells can multiply and form matching clones. This process is called clonal haematopoiesis, and scientists disagree on whether it harms or protects the brain. To investigate, researchers tracked older adults between ages 73 and 79 over 6 years using blood tests and brain scans. They measured blood cell mutations through chemical tags on DNA, known as methylation, and monitored brain changes over time. They found that a higher burden of mutated blood cells was linked to shrinking brain tissue, particularly grey matter. This shrinkage followed a progressive, left-sided pattern in temporal and parietal brain areas, matching patterns seen in Alzheimer’s disease. However, the hippocampus did not show significant shrinking, and the caudate showed nominal preservation, revealing some differences from classic Alzheimer’s. Overall, mutated blood stem cells track brain shrinkage in older adults, showing a pattern that resembles Alzheimer’s disease.
Imagine you keep a garden for decades. A single weed spreads until it takes over a whole bed, but you only notice when the flowers nearby start to wilt, and the weed doesn't tell you which flowers will suffer or how fast. In this paper, the weed is a population of mutated blood cells that expands with age, and the wilting flowers are the brain tissue shrinking in Alzheimer's-like regions. The researchers track both over time to see whether the weed's spread lines up with the pattern of damage.
This matters for researchers studying ageing and dementia: a blood-based measure of clonal haematopoiesis may serve as a candidate marker of adverse brain ageing in cognitively healthy older adults. If confirmed, it could help identify who is experiencing Alzheimer's-like cortical atrophy before cognitive symptoms appear.
The abstract does not establish whether the association is causal or whether clonal haematopoiesis tracks Alzheimer's pathology specifically rather than age-related neurodegeneration more broadly. The subcortical results — no significant hippocampal association and only nominal caudate preservation — suggest divergence from the canonical Alzheimer's profile, so the AD-specific interpretation is tentative. The sample is a single birth cohort of community-dwelling older adults, which may limit generalisability.
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Clonal Haematopoiesis Tracks Alzheimer’s-like Cortical Atrophy in Community-Dwelling Older Adults — Suwanlikit Y, S.J.C. Crofts, J.E. Moodie et al. — medRxiv — doi:10.64898/2026.09.10.26362681
Abstract licence: CC BY
Explanation generated by Synthesis from the abstract — it is not the original paper. This is a preprint, so it hasn't necessarily been peer reviewed.