Abstract
We investigated the parent and cell division of origin of the extra chromosome 18 in 62 aneuploids with a free trisomy 18 by using chromosome-18-specific pericentromeric short-sequence repeats. In 46 cases, DNA of patients was recovered from archival specimens, such as paraffin-embedded tissues and fixed chromosomal spreads. In 56 families, the supernumerary chromosome was maternal in origin; in six families, it was paternal. Among the 56 maternally derived aneuploids, we could exclude a postzygotic mitotic error in 52 cases. Among those in which the nondisjunction was attributable to an error at meiosis, 11 were the result of a meiosis I nondisjunction and 17 were caused by a meiosis II error. This result differs markedly from findings in acrocentric chromosomes where nondisjunction at maternal meiosis I predominates. Among the six paternally derived cases, two originated from a meiotic error, indicating that a nondisjunction in paternal meiosis is not as rare as previously suggested.
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Dedicated to Professor Dr. W. Gottschalk on the occasion of his 75th birthday
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Eggermann, T., Nöthen, M.M., Eiben, B. et al. Trisomy of human chromosome 18: Molecular studies on parental origin and cell stage of nondisjunction. Hum Genet 97, 218–223 (1996). https://doi.org/10.1007/BF02265269
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DOI: https://doi.org/10.1007/BF02265269