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Molecular cytogenetic characterization of a familial der(1)del(1)(p36.33)dup(1)(p36.33p36.22) with variable phenotype

Chromosome deletions involving 1p36 are the most common known terminal rearrangements occurring at a frequency of ∼1 in 5,000 live births. In contrast, duplications of the same region have been reported rarely. We describe a familial rearrangement der(1)del(1)(p36.33)dup(1)(p36.33p36.22) identified in a mother, daughter, and son. These individuals help define a syndrome with variable mental disability, attention deficit‐hyperactivity disorder, and a distinctive facial appearance with wide palpebral fissures, broad nasal root, macrostomia, ear malformations, and prominent incisors. Based on our results we suggest that the complex rearrangement seen in our family could be the result of the breakage‐fusion‐bridge (BFB) cycles model of formation. © 2005 Wiley‐Liss, Inc.