Nuclear proteins that are localized in discrete domains within the nucleus include the leukemia-associated acute myelogenous leukemia (AML) and promyelocytic leukemia (PML) factors, the SC-35 RNA-processing factors, nucleolar proteins and components of both transcriptional and DNA replication complexes.
The PML and SP100-containing nuclear bodies (NBs) represent the best-studied example of a defined nuclear substructure the integrity of which is compromised in certain human diseases, including leukemia, neurodegenerative disorders and viral infection.