De novo direct tandem duplication of a small segment of the short arm of chromosome 7 (p21.22→22.1)
2008
We report a boy with duplication of a small segment of the short arm of chromosome 7 (46, XY, dir dup (7) (p21.222.1). The boy presented with supravalvular pulmonary stenosis, atrial septum defect and mental retardation. The origin of the additional material from chromosome 7 was confirmed by fluorescence in situ hybridization. This technique in combination with the use of single-copy DNA probes may in future help to delineate the phenotype/karyotype correlation.
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