A clinical study of patients with pericentromeric deletion and duplication within 16p12.2-p11.2.

The short arm of chromosome 16 is rich in segmental duplications that result in chromosomal rearrangements through non-allelic homologous recombination. Several syndromes resulting from microdeletions or microduplications in this region have been reported. The chromosome 16p12.2-p11.2 deletion syndrome, 7.1- to 8.7-Mb [OMIM#613604] is characterized by minor facial anomalies, feeding difficulties, a significant delay in speech development, and recurrent ear infections. Reciprocal duplications of 16p12.2-p11.2 have been reported in some patients with autism. We identified a patient with a 16p12.2-p11.2 deletion and a patient with a 16p12.2-p11.2 duplication using oligonucleotide SNP array. The patient with the deletion showed severe developmental delay without autism. The patient with the deletion shared clinical features with previously reported patients. The patient with the duplication showed mild developmental delay and autism. She had dysmorphic features including a round face, a large mouth, and relative macrocephaly. We reviewed the reports of the two syndromes and compared the clinical manifestations. The 16p12.2-p11.2 duplication syndrome is a new syndrome with autism spectral disorders and dysmorphic features.