Oocyte-specific linker histone H1 (H1FOO)

Oocyte-specific linker histone H1 (H1FOO, also known as H1.8, H1oo, H1-8) is a variant of the histone H1 family that is predominantly expressed in vertebrate oocytes and early embryos[1]. It is a linker histone that binds to nucleosome-bound DNA at the entry and exit sites of the nucleosome and tethers the two linker DNA regions, contributing to compaction of chromatin into higher-order structures[1][3][4]. H1FOO/H1.8 is distinct from the somatic histone H1 variants and is essential for chromosome condensation and segregation during early embryogenesis, particularly by finely regulating the loading of structural chromatin proteins like condensin complexes and topoisomerase II[1]. By modulating the accessibility of these proteins, H1FOO ensures proper chromosome morphology and function, and its absence leads to abnormal chromosome shapes and defective cell division[1]. While it is not a classical therapeutic target such as a receptor or enzyme, H1FOO is crucial for epigenetic regulation and chromatin architecture in oocytes and early embryos[1][3][4].

Other names

Histone H1.8H1-8H1FOOH1OOOSH1osH1Histone H1ooH1oohistone H1ooHistone H1FOOOocyte-specific histone H1H1.8histone H1.8H1 histone family member O oocyte specificoocyte-specific linker histone H1