Abstract
In an infant with multiple malformations (microcephaly, deformities of the skull, malformation of the eyes, skeletal abnormalities, inquinal hernias, malformation of the heart, severe mental retardation) we found within a modal number of 45 chromosomes one extra chromosome of a particularly large shape. On the other hand two chromosomes of the C-group were missing. Since there is agreement between the autoradiographic results in blood culture and the sex-chromatin findings we assume a partial translocation of a C-group chromosome to a X-chromosome. Whereas this X-chromosome shows a late DNA-replication pattern and seems to be inactivated, the translocated part of the autosome is not involved into the replication process of the gonosome; hence does not seem to be inactivated.
The cytogenetic findings and their relation to the hypothesis of LYON are discussed. In comparing these findings with the observed X-autosomal translocations in mice discretion is indicated. In this study the inactivation of the X-chromosome seems to remain without influence on the translocated part of the autosome. The phenotypic appearance of the child with multiple abnormalities is due to the deletion of the C-group chromosome (C'?), which is affected by the translocation.
Anamnestic data indicate that preconceptional exposure of the paternal gonads to X-rays may have caused the chromosomal aberration.
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Herrn Professor Dr. med. T. von Lanz zum 70. Geburtstag gewidmet.
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Neuhäuser, G., Back, F. X-Autosom-Translokation bei einem Kind mit multiplen Mißbildungen. Hum Genet 3, 300–311 (1967). https://doi.org/10.1007/BF00292280
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DOI: https://doi.org/10.1007/BF00292280