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Chromosome studies in 500 induced abortions

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A survery of the chromosome constitution in 500 induced abortions (5–12 menstrual weeks) was undertaken over a period of 1 1/2 years. There were 34 cases (6.8%) of gross chromosome anomalies: 2 cases of trisomy A; 5 of trisomy C (including XXX and XXY); 1 of mosaic trisomy C; 4 of trisomy D; 2 of trisomy E; 2 of trisomy G; 1 of double trisomy E and G; 1 of XYY; 4 of monosomy C (including XO); 2 of mosaic monosomy C; 1 of mosaicism of ring D chromosome; 1 of extra small metacentric chromosome; 3 of triploidy (including triploidy with double trisomy C and G); and 5 of tetraploidy and its mosaicism.

An increased risk for the occurrence of trisomic anomalies was found with advancing age of the mothers. In contrast, the production of monosomies was not age-related. Trisomies were the most common type of anomalies and were found almost at random, regardless of the characteristics of chromosomes. Neither satellited nor smaller chromosomes were predominantly involved in the formation of chromosome anomalies.

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Yamamoto, M., Fujimori, R., Ito, T. et al. Chromosome studies in 500 induced abortions. Hum Genet 29, 9–14 (1975). https://doi.org/10.1007/BF00273345

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  • Internal Medicine
  • Metabolic Disease
  • Common Type
  • Chromosome Anomaly
  • Small Chromosome