A Possible Behavioural and Cognitive Phenotype for the 47,XYY Karyotype in a Pre-Pubertal Child

Abstract

Objective: The aim of this study was to describe the case of a 9-year-old boy with 47,XYY genotype and possible behavioural phenotype involving ‘internalizing’ and ‘externalizing’ symptoms and cognitive phenotype of deficient spatial memory.

Conclusions: Longitudinal study of 47,XYY cases recognized prenatally are needed to confirm the preliminary findings described in this report.

Keywords

47,XXY behavioural and cognitive phenotype

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