Nuclear mitotic apparatus protein 1 (NUMA1)

Nuclear mitotic apparatus protein 1 (NUMA1) is a large, evolutionarily conserved protein that forms a key structural component of the nuclear matrix in vertebrates[4][5]. NUMA1 is essential for mitotic spindle assembly and ensures proper organization and orientation of chromosome segregation during cell division by associating with spindle microtubules and cross-linking their minus-ends at spindle poles[1][2][3][4][5]. Its interactions—in particular with dynein and dynactin complexes—are central to spindle pole focusing, spindle positioning, and reformation of the nucleus. NUMA1 is dynamically regulated via phosphorylation during mitosis and can self-assemble into higher-order structures essential for maintaining nuclear integrity. Chromosomal translocations involving NUMA1 are implicated in certain cancers, including acute promyelocytic leukemia[1][2][4][5]. The NMP22 antigen, derived from NUMA1, is used in clinical diagnostics as a urinary biomarker for bladder cancer[4]. There are no established drugs that specifically target NUMA1 as a therapeutic agent. Key details: - NUMA1 is not considered a direct therapeutic target (e.g., receptor, enzyme) but is a critical structural protein for cell division and nuclear architecture[1][4][5]. - Alternate splicing generates multiple isoforms with context-dependent localization and function[2][5]. - Defects or dysregulation of NUMA1 function lead to aberrant mitosis, spindle assembly defects, and are associated with certain cancers[1][2]. - It's important in research on cancer mechanisms rather than a direct drug target[1][2][4][5].

Other names

NuMA proteinNMP22Nuclear matrix protein-22centrophilinSP-H antigenNMP-22Nuclear mitotic apparatus proteinstructural nuclear protein