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Etiological yield of SNP microarrays in idiopathic intellectual disability
- Source :
- European journal of paediatric neurology : EJPN : official journal of the European Paediatric Neurology Society. 18(3)
- Publication Year :
- 2013
-
Abstract
- Intellectual disability (ID) has a prevalence of 3% and is classified according to its severity. An underlying etiology cannot be determined in 75–80% in mild ID, and in 20–50% of severe ID. After it has been shown that copy number variations involving short DNA segments may cause ID, genome-wide SNP microarrays are being used as a tool for detecting submicroscopic copy number changes and uniparental disomy. This study was performed to investigate the presence of copy number changes in patients with ID of unidentified etiology. Affymetrix ® 6.0 SNP microarray platform was used for analysis of 100 patients and their healthy parents, and data were evaluated using various databases and literature. Etiological diagnoses were made in 12 patients (12%). Homozygous deletion in NRXN1 gene and duplication in IL1RAPL1 gene were detected for the first time. Two separate patients had deletions in FOXP2 and UBE2A genes, respectively, for which only few patients have recently been reported. Interstitial and subtelomeric copy number changes were described in 6 patients, in whom routine cytogenetic tools revealed normal results. In one patient uniparental disomy type of Angelman syndrome was diagnosed. SNP microarrays constitute a screening test able to detect very small genomic changes, with a high etiological yield even in patients already evaluated using traditional cytogenetic tools, offer analysis for uniparental disomy and homozygosity, and thereby are helpful in finding novel disease-causing genes: for these reasons they should be considered as a first-tier genetic screening test in the evaluation of patients with ID and autism.
- Subjects :
- Male
Adolescent
DNA Copy Number Variations
Biology
Bioinformatics
Polymorphism, Single Nucleotide
Young Adult
Angelman syndrome
Intellectual Disability
Gene duplication
Intellectual disability
medicine
SNP
Humans
Genetic Predisposition to Disease
Copy-number variation
Genetic Testing
Child
Genetics
General Medicine
Uniparental Disomy
medicine.disease
Microarray Analysis
Uniparental disomy
Child, Preschool
Pediatrics, Perinatology and Child Health
Etiology
Female
Neurology (clinical)
SNP array
Subjects
Details
- ISSN :
- 15322130
- Volume :
- 18
- Issue :
- 3
- Database :
- OpenAIRE
- Journal :
- European journal of paediatric neurology : EJPN : official journal of the European Paediatric Neurology Society
- Accession number :
- edsair.doi.dedup.....a4e8dd3c48752ab9e94c873d4476e3f5