Summary
Ten families (Down syndrome children and their parents) showing evidence of meiotic recombination between intraparental chromosomes transmitted after nondisjunction were studied. Cytogenetic polymorphisms and a cassette of RFLP markers distributed along chromosome 21 were used to analyze these families to localize the regions of meiotic recombination. Results indicated that only one crossover occurred per meiotic division and that nine of ten nondisjunctions appeared to be of maternal origin. In one family the crossover had taken place in the pericentromeric region, proximal to marker D21S13, which is quite exceptional. A chance of meiotic recombination within region 21q21, flanked by marker D21S72 and the amyloid gene, could be demonstrated in seven of the ten families. Most strikingly, this chance significantly decreased distal to q21, with frequencies of 0.3 and 0.1 in regions q22.2 and q22.3-qter, respectively. It is hypothesized that decreased chiasmata formation in the most distal part of chromosome 21q might promote nondisjunction. Furthermore, data from the ten crossovers made it possible to map provisionally two previously undefined markers, D21S24 and D21S82, to regions q21-qter and q22.1-qter, respectively.
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Meijer, H., Hamers, G.J.H., Jongbloed, R.J.E. et al. Distribution of meiotic recombination along nondisjunction chromosomes 21 in Down syndrome determined using cytogenetics and RFLP haplotyping. Hum Genet 83, 280–286 (1989). https://doi.org/10.1007/BF00285173
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DOI: https://doi.org/10.1007/BF00285173