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Summary The results of our study of the origin of the additional X chromosome in 39 males with a 47, XXY chromosome constitution are reported. We used a total of 20 X‐linked RFLPs and successfully determined the origin of all 32 patients in whom DNA from both parents was available, and a further 3 in whom DNA was available from the patient and mother only. Males whose additional X chromosome was maternal in origin were further investigated using an X‐linked centromere specific probe to determine the cell division at which the error occurred. Our results showed 53% of the non‐disjunction to be attributable to pat mei I errors, 34% to mat mei I errors, 9% to mat mei II errors and 3% to a post‐zygotic mitotic error. In the great majority of patients resulting from an error of maternal meiosis there was clear evidence of recombination involving the non‐disjoined chromosomes, suggesting that absence of recombination is not an important aetiological factor in non‐disjunction of the X chromosome in female meiosis. There was no alteration of parental age associated with the paternally derived 47, XXY males but a marked increase in maternal age among the maternally derived 47, XXY males, the increase being associated with mat mei I but not mat mei II errors. The proportion of paternally and maternally derived cases was similar among different ascertainment classes, suggesting that there is no dramatic effect of parental origin of the additional X chromosome on the phenotype of 47, XXY males.
Annals of Human Genetics – Wiley
Published: May 1, 1988
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