Summary
The combination of dermatoglyphic patterns and the number and intensity of traits characteristic for Down’s syndrome can be statistically expressed by the “Walker” index and the “general” index. More than 96% of a Down’s syndrome series and a control series could clearly be separated by the general index.
Cytogenetic and dermatoglyphic features were studied in 17 patients with mosaic trisomy 21 and their parents. In the 17 cytogenetically diagnosed patients with mosaic Down’s syndrome, a highly significant correlation was observed between the percentage of trisomic cells and the presence of traits characteristic for this syndrome in the dermatoglyphic patterns. The diagnostic problems and the value of dermatoglyphic examination in cases of mosaicism, where the trisomic cell line seems to have disappeared, is discussed. The results of our study also indicate an elevated incidence of a specific dermatoglyphic pattern combination with general index values similar to Down’s syndrome in one parent in nearly 20% of Down’s syndrome children. The possibility of hidden mosaicism in these parents of Down’s syndrome children is discussed. Furthermore, the dermatoglyphic patterns in a large kindred with an inherited 15/21 translocation (21/41 carriers of the balanced translocation; 14/41 chromosomally normal; 6/41 mongoloid members) was analyzed. The data obtained from this translocation family and especially the values obtained in the general index indicate that some dermatoglyphic stigmata are directly associated with the D/21 translocation carrier state and can therefore be used for predicting this state.
Supported by the Deutsche Forschungsgemeinschaft Za 79/1 and Ro 516/1
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© 1981 Springer-Verlag Berlin Heidelberg
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Rodewald, A., Zang, K.D., Zankl, H., Zankl, M. (1981). Dermatoglyphic Peculiarities in Down’s Syndrome Detection of Mosaicism and Balanced Translocation Carriers. In: Burgio, G.R., Fraccaro, M., Tiepolo, L., Wolf, U. (eds) Trisomy 21. Human Genetics Supplement, vol 2. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-68006-9_4
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DOI: https://doi.org/10.1007/978-3-642-68006-9_4
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