Moderate mental retardation and nonspecific dysmorphic syndrome associated with ring chromosome 9 |
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| Authors: | J P Fryns A Lambrechts H Jansseune H Van den Berghe |
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| Institution: | (1) Department of Human Biology, Division of Human Genetics, Minderbroedersstraat, 12, B-3000 Leuven, Belgium;(2) M.P.I. Sint-Jozef, B-2030 Antwerpen, Belgium |
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| Abstract: | Summary A ring chromosome 9 is reported in a 12-year-old, moderately mentally retarded boy. As in other ring chromosome 9 patients, the clinical stigmata are nonspecific and their expressivity is mild. The finding of two normal cells of a total of 121 cells examined favors the hypothesis of a postzygotic, mitotic origin of the ring chromosome formation. |
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