Iqbal MA, Martin AO, Simpson JL. Increased sister chromatid exchanges in human cell lines characterized by monosomy X or structural abnormalities of the X chromosome.
Hum Genet 1984;
68:205-8. [PMID:
6500574 DOI:
10.1007/bf00418389]
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Abstract
In the present investigation we test the hypothesis that deficiencies of the X chromosome affect sister chromatid exchange (SCE) frequencies in human fibroblast cell lines. Our results show increased mean SCE frequencies in cell lines with abnormalities of the X chromosome: 45,X; 46,X,del(X) (q13), 46,X,del(X)(p11), and 46,X,i(Xq); control cell lines were 46,XX. In only one abnormal line [46,X,del(X)(p11)] was the increase not significant after correcting for multiple comparisons. If SCE formation is replication-dependent, the increased SCE frequencies might merely reflect the prolonged cell cycle we reported previously in cell lines with X chromosome abnormalities (Simpson and LeBeau 1981). Other explanations for differences between cell lines are possible, e.g., that deleted loci on the X chromosome affect cellular uptake of bromodeoxyuridine (BrDU). However, specific mechanisms were not explored directly.
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