Cytogenomic microarray (CMA) methodologies, including array comparative genomic
hybridization (aCGH) and single-nucleotide polymorphism-detecting arrays (SNP-array), are
recommended as the first-tier test for the evaluation of imbalances associated with
intellectual disability, autism, and multiple congenital anomalies. The authors report on
a child with global developmental delay (GDD) and a
de novo
interstitial
7.0 Mb deletion of 9q21.33q22.31 detected by aCGH. The patient that the authors report
here is noteworthy in that she presented with GDD and her interstitial deletion is not
inclusive of the 9q22.32 locus that includes the
PTCH1
gene, which is
implicated in Gorlin syndrome, or basal cell nevus syndrome (BCNS), has not been
previously reported among patients with a similar or smaller size of the deletion in this
locus suggesting that the genomic contents in the identified deletion on 9q21.33q22.31 is
critical for the phenotype.