Background: Copy-number variants (CNVs) of chromosome 15 have been associated with neurodevelopmental disorders like autism spectrum disorders (ASDs) and developmental delay.

We report 6 patients with autistic features and other neurodevelopmental problems carrying CNVs of chromosome 15.

Materials and methods: The probands belong to a group of patients referred to our clinic and laboratory with autism as main feature. A complete clinical evaluation was performed with focus on neurologic, psychiatric, and psychological evaluation with specific autism tests. Array-based comparative genomic hybridization (array-CGH) was performed using 180K platform (Agilent technology).

six patients investigated by array-CGH had a CNV involving chromosome 15. Four of these patients, previously reported by us (ref 1), had small duplications of 15q13.3 involving CHRNA7 and OTUD7A genes. The other two patients had large deletions of 15q21q22 and 15q24, respectively. A deletion of 15q21.2 - q22.2 was detected in one patient. The deleted region contains 62 genes and has been rarely reported in patients with neurodevelopmental disorders. A deletion of 15q24.1 - q24.2 was detected in the other patient. This region is recurrently deleted in developmentally delayed patients (ref 3).

Our data highlight that chromosome 15 is a hub for neurodevelopmental disorder and illustrates the utility of array-CGH in the investigation of patients with autism, specifically in the context of complex phenotypes. Acknowledgment: The research leading to these results has received funding from the EEA Grant 2014-2021, under the project contract No 6/2019. References: Genes (Basel). 2021 Jul 1;12(7):1025. https://www.omim.org/entry/618060 Clinical Genome Resource. https://dosage.clinicalgenome.org/clingen_region.cgi?id=ISCA-46296

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