The function of Ensembl gene identifier ENSG00000124610 (H1-1, H1.1 linker histone, cluster member) is as follows. Histone H1 protein binds to linker DNA between nucleosomes forming the macromolecular structure known as the chromatin fiber (PubMed:11130728). Histones H1 are necessary for the condensation of nucleosome chains into higher-order structured fibers and promote formation of the H3K27me3 mark by the PRC2/EED-EZH2 complex (PubMed:11130728). Also acts as a regulator of individual gene transcription through chromatin remodeling, nucleosome spacing and DNA methylation (By similarity). {ECO:0000250|UniProtKB:P10412, ECO:0000269|PubMed:11130728}.