De novo duplication (5)(q31.3q33.3): report of a patient and characterization of the duplicated region using microdissection and FISH

We report on a 2‐year‐old boy presenting with growth and psychomotor retardation and facial anomalies, including a flat face with prominent forehead, a flat nasal bridge and flat occiput, unusually long curved eyelashes, and a thin upper lip with down‐turned corners of the mouth. Analysis of GTG‐banded chromosomes demonstrated that the patient had extra chromosomal material in the long arm of one chromosome 5. This chromosome aberration was characterized further using microdissection and FISH with band‐specific probes and a de novo direct duplication (5)(q31.3q33.3) was shown to be present. We have compared this case with others known to be partially trisomic for chromosome 5q reported in the literature. © 2001 Wiley‐Liss. Inc.