Cytogenetic and array CGH characterization of an intrachromosomal complex rearrangement of 4q in a patient with a 4q-phenotype.

We report on a 3-year-old child who presented a de novo rearrangement of chromosome 4, detected on GTG banding and characterized by array CGH and FISH, as a complex intrachromosomal rearrangement with three deletions: del(q32.1q32.2), del(q33q34.1), del(q35.2), one tandem duplication dup(q34.3q35.1) and short normal regions in between. The study of karyotype-phenotype correlations in this and other patients with deletions of 4q suggests 4q33q34.1 as a candidate region for 4q-syndrome and for craniofacial development.