Autoantibodies directed to a variety of cellular antigens and organell
es are a feature of autoimmune diseases. They have proven useful in a
clinical setting to establish diagnosis, estimate prognosis, follow di
sease progression, alter therapy, and initiate new investigations. Cel
lular and molecular biologists have used autoantibodies as probes to i
dentify molecules involved in key cellular processes. One of the most
interesting sets of autoantibodies are those that target antigens with
in the mitotic apparatus (MA). The MA includes chromosomes, spindle mi
crotubules and centrosomes. The identification, localization, function
, and clinical relevance of MA autoantigens is the focus of this revie
w.