title: Parental origin of chromosome abnormalities in spontaneous abortions.
abstract: Tissue cultures were initiated from 130 spontaneous abortion specimens and 81 were successfully karyotyped. Chromosome abnormalities were found in 50 cases: 12 with XO, 27 with trisomy, 6 with triploidy, 1 with tetraploidy and 4 others. The parental origin was determined in 11 cases of trisomy for an acrocentric chromosome. Two cases were uninformative while 9 non-disjunctions were determined and occurred during meiosis I: 7 were maternal and 2 paternal (both with trisomy 21). Three out of 7 cases with trisomy 16 were informative and resulted from a divisional error during the first meiotic division in the mother. All cases of triploidy were informative. They resulted from non-reduction during meiosis I in the mother (2) or dispermy (4).
mesh_terms: D000022:Abortion, Spontaneous / Q000235:genetics*; D000328:Adult; D000782:Aneuploidy; D002869:Chromosome Aberrations; D005260:Female; D006801:Humans; D007621:Karyotyping; D008297:Male; D008540:Meiosis; D009630:Nondisjunction, Genetic; D011003:Ploidies; D011110:Polymorphism, Genetic; D011247:Pregnancy; D012730:Sex Chromosomes; D014314:Trisomy