[Complex study of human cell strains with karyotype anomalies. II. Mitotic cycle parameters]

The object of this investigation were the parameters of the mitotic cycle in 14 fibroblasts-like cell strains with chromosome aberrations obtained from skin biopsies of patients and from spontaneous human abortuses. In two strains of embryonal origin (trisomic for chromosome and monosomic for chromosome 21) increased duration of stage G2 of the cell cycle accompanied by a shorter period of DNA synthesis was observed. In the other 5 strains of embryonal origin (two strains trisomic for chromosome 7, strains trisomic for chromosome 9, trisomic for chromosome 14 and triploid strains) no deviations from the normal duration of the stages of the cell cycle were observed. Two types of changes of the mitotic cycle parameters were observed in the cell strains obtained from patients with chromosome aberrations. A considerably prolonged G2 stage was observed in two strains obtained from patients affected by Down's syndrome. Three strains with the karyotypes 47, XXX, 47 XY+18 and 46, XX, 5p-were characterized by a complex of features typical of the strains of embryonal origin. A considerable decrease of the stage G2 duration was observed in these strains. In the strains obtained from a proband with Kleinfelter's syndrome and from a patient with the karyotype 46XX no deviations in the parameters of the cell cycle were observed.