2015 年 22 巻 2 号 p. 181-183
Previously unknown histone H4 acetylation at Lysine 20 (H4K20ac) was intensively investigated. By mass spectrometry analysis, the existence of H4K20ac in mammalian cells was proved. The genome wide analysis by ChIP seq with a next generation sequencer revealed that H4K20ac was accumulated on the promoter region of weakly expressing genes, which is almost opposite to the conventional view of histone acetylation modifi cations. The motif search of H4K20ac suggested that well-known transcriptional repressor, NRSF can bind to H4K20ac distributed area. Furtherly, gene ontology identifi ed that H4K20ac was implicated in cell growth. New histone acetylation modifi cation, H4K20ac may open new mechanistic insight for cell growth.