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Clin Genet. 1987 Jan;31(1):53-60.

Chromosomal aberrations in 85 mentally retarded patients examined by high resolution banding.


Eighty-five mentally retarded patients had their chromosomes examined by using the high resolution banding techniques. Fifty-nine of them had multiple congenital anomalies and/or dysmorphic features. Twenty-six had mental retardation but no major anomalies; they were primarily suspected of having the fragile X syndrome. This suspicion was first excluded. Fifteen patients were found to have a chromosome aberration, interpreted as clinically significant. Eleven of them had been examined earlier by conventional methods. The aberrations found were divided into three groups: (I) those detectable with an accuracy of ca. 300-400 bands (N = 4), (II) those detectable with an accuracy of ca. 400-550 bands (N = 6) and (III) those detectable with an accuracy of ca. 550-850 bands (N = 5). The aberrations are described and discussed.

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