E-ISSN 1309-4866
Research Article
Investigation of Copy Number Variation by arrayCGH in Turkish Children and Adolescents Diagnosed with Autism Spectrum Disorders
1 Department of Child and Adolescent Psychiatry, Trakya University School of Medicine, Edirne, Turkey  
2 Department of Medical Genetics, Trakya University School of Medicine, Edirne, Turkey  
3 Department of Child and Adolescent Psychiatry, Samsun Training and Research Hospital, Samsun, Turkey  
4 Department of Child and Adolescent Psychiatry, Kırklareli State Hospital, Kırklareli, Turkey  
5 Department of Child and Adolescent Psychiatry, Edirne State Hospital, Edirne, Turkey  
6 Department of Child and Adolescent Psychiatry, İstanbul University İstanbul School of Medicine, İstanbul, Turkey  
7 Department of Child and Adolescent Psychiatry, Osmangazi University School of Medicine, Eskişehir, Turkey  
8 Department of Child and Adolescent Psychiatry, Diyarbakır Children's Hospital, Diyarbakır, Turkey  
Arch Neuropsychiatry ; : -
DOI: 10.5152/npa.2017.21611
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Key Words: ASD, arrayCGH, CNV, microdeletion, microduplication
Abstract

Introduction: The development of whole-genome screening methodologies for the detection of copy number variations (CNVs), such as array-based comparative genomic hybridization (aCHG), provides a much higher resolution than karyotyping leading to the identification of novel microdeletion and microduplication syndromes often associated with an autism spectrum disease (ASD) phenotype. The aim of the study was to determine CNVs of patients with ASD by using array-based comparative genomic hybridization.

 

Methods: 53 patients diagnosed with ASD between 20.01.2014 and 14.01.2015 were included in the study. Chromosome analysis of the patients was performed from peripheral blood cultures and analysed as normal. All patients were evaluated with P064C1 and P096A2 MLPA probes in terms of 16 mental retardation related syndromes. For aCGH method, SurePrint G3 Human microarrays 8x60K were used with genomic DNA isolated from peripheral blood.

 

Results: According to results of 53 patients who were included in and performed with arrayCGH, 8 (15%) patients had CNVs classified as pathogenic or variant of unknown significance (VOUS) in the study. We detected a pathogenic NRXN1 gene partial CNV deletion (2p16.3) in two patients. Also we identified a 900 kb duplication of 4p15.31 including SLIT2 gene and a 245 kb duplication of 15q11.2 including PWRN1 gene in one patient. Our other findings considered to be a variant of unknown significance (VOUS).

 

Conclusion: The results of the study support the literature knowledge, where copy number variations that cannot be detected with conventional cytogenetics methods in terms of size may happen in patients with ASD.

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