Histone H1.0

Histone H1.0 (H1-0) is a linker histone that binds DNA between nucleosomes and promotes chromatin fiber condensation into higher-order structures (UniProt: P07305). It is particularly abundant in terminally differentiated cells or those with low proliferation rates, and facilitates chromatin compaction partly through promoting H3K27me3 mark formation by the PRC2/EED-EZH2 complex (UniProt: P07305).

Histones are core components of eukaryotic chromatin organization, regulating DNA accessibility and gene expression across tissues. H1.0 is predominantly expressed in differentiated cell populations where transcriptional activity is reduced.

In Alzheimer's disease, Histone H1.0 shows increased abundance in post-mortem AD brain tissue compared to age-matched controls (Chaparral AD proteomics), with a mean log2 fold-change of 0.63. This upregulation suggests altered chromatin condensation or structural remodeling in AD neuropathology, though the functional significance of elevated H1.0 in disease pathogenesis remains to be clarified.