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Cytogenetic and flow cytometric studies of cells from patients with Fanconi's anemia.

Cells from patients wtih Fanconi's anemia are unusually sensitive to agents which are capable of crosslinking DNA. This increased sensitivity can be detected both by cytogenetic and flow cytometric methods. An elevated frequency of chromosome aberrations, which is further exaggerated by exposure of cells to DNA crosslinking agents, is a general feature of Fanconi's anemia. Information about the formation of sister chromatid exchanges in this disease is less consistent. Cytogenetic analysis of cells from patients with Fanconi's anemia can be compromised by a low mitotic index. This is reflected in an accumulation of cells In the G2 phase of the cycle, after exposure to the bifunctional alkylating agent, mitomycin C. New methods for differentiating individuals with Fanconi's anemia from unaffected individuals should be of empirical use and might also facilitate mechanistic studies of this disease.