KIF18A

Class

small molecule

Notes

original target text: KIF18A Inhibitor

KIF18A is a motor protein belonging to the kinesin family, molecules that move along microtubules — the filament tracks that form the mitotic spindle during cell division. KIF18A works at the kinetochore, the site where spindle fibers attach to chromosomes, helping to align chromosomes properly and keep spindle length in check before a cell divides. Many cancers exhibit chromosomal instability, a state in which cells missegregate chromosomes at an abnormally high rate, generating genetic diversity that can fuel tumor evolution and drug resistance. Paradoxically, cells with high chromosomal instability often become dependent on KIF18A to keep spindle errors below a threshold survivable enough to complete division; without it, the errors accumulate to lethal levels. Ordinary cells, which segregate chromosomes accurately without this compensatory demand, tolerate loss of KIF18A activity far better. This differential dependency is the rationale for developing small-molecule inhibitors of KIF18A: by blocking its motor function, such agents aim to selectively induce fatal mitotic errors in genomically unstable tumor cells while sparing normal, chromosomally stable tissue. This mechanism is of particular interest in solid tumors marked by high aneuploidy, where conventional cytotoxic or targeted approaches often struggle to achieve tumor-selective effects.