Genome instability is a fundamental concept in genetics and molecular biology that characterizes an elevated rate of spontaneous mutations and chromosomal aberrations within a cell lineage. This academic concept investigates the cellular mechanisms responsible for maintaining genome integrity and the consequences of their dysfunction, such as defects in DNA replication, repair, and segregation. Its significance lies in its critical role as a driving force in evolution and a major contributor to the pathogenesis of numerous diseases, particularly developmental disorders and cancer.