title: Gamma interferon-dependent transcriptional memory via relocalization of a gene locus to PML nuclear bodies.
abstract: Memory of past cellular responses is an essential adaptation to repeating environmental stimuli. We addressed the question of whether gamma interferon (IFN-gamma)-inducible transcription generates memory that sensitizes cells to a second stimulus. We have found that the major histocompatibility complex class II gene DRA is relocated to promyelocytic leukemia (PML) nuclear bodies upon induction with IFN-gamma, and this topology is maintained long after transcription shut off. Concurrent interaction of PML protein with mixed-lineage leukemia generates a prolonged permissive chromatin state on the DRA gene characterized by high promoter histone H3 K4 dimethylation that facilitates rapid expression upon restimulation. We propose that the primary signal-induced transcription generates spatial and epigenetic memory that is maintained through several cell generations and endows the cell with increased responsiveness to future activation signals.
authors.affiliation: Institute of Molecular Biology and Biotechnology, Forth, Heraklion 71110, Greece.
authors.forename: Manolis
authors.initials: M
authors.lastname: Gialitakis
authors.forename: Panagiota
authors.initials: P
authors.lastname: Arampatzi
authors.forename: Takis
authors.initials: T
authors.lastname: Makatounakis
authors.forename: Joseph
authors.initials: J
authors.lastname: Papamatheakis
mesh_terms: D000818:Animals; D002843:Chromatin / Q000235:genetics / Q000378:metabolism; D044127:Epigenesis, Genetic; D005802:Genes, MHC Class II; D006367:HeLa Cells; D006657:Histones / Q000235:genetics / Q000378:metabolism; D006801:Humans; D007371:Interferon-gamma / Q000235:genetics / Q000378:metabolism*; D045586:Intranuclear Inclusion Bodies / Q000235:genetics* / Q000378:metabolism; D009687:Nuclear Proteins / Q000235:genetics / Q000378:metabolism*; D011401:Promoter Regions, Genetic; D000071156:Promyelocytic Leukemia Protein; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism*; D014158:Transcription, Genetic; D015533:Transcriptional Activation; D025521:Tumor Suppressor Proteins / Q000235:genetics / Q000378:metabolism*
chemical_list: D002843:Chromatin; D006657:Histones; D009687:Nuclear Proteins; D000071156:Promyelocytic Leukemia Protein; D014157:Transcription Factors; D025521:Tumor Suppressor Proteins; C070576:PML protein, human; D007371:Interferon-gamma