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Copy number variation analysis in Japanese children with Autsim Spectrum Disorder by Affymetrix Genome-Wide Human SNP Array 6.0.

ABSTRACT: Autism spectrum disorder (ASD) is an innate neurodevelopmental disorder characterized by impairments in social communication/interaction, repetitive and restrictive behavior. Copy number variation (CNV) is a one of the structural variation of the genomic sequence, including large multiplications and deletions ranging from kb to Mb of DNA. These multiplication-deletion provide genomic diversity, while CNV affects the amount of gene products or transcriptional regulation, and result in strong association with biological process, metabolism and disease. In facts, many studies reported that the mapping of CNVs which strongly associated with ASD. The subjects of this study were the community-based 5 years old children because they might be able to except acquired effects after birth as much as possible and focus on the genetic background, and there are possibilities that the results will be specific to the Japanese patients with ASD.

ORGANISM(S): Homo sapiens

PROVIDER: GSE144918 | GEO | 2020/08/01

REPOSITORIES: GEO

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Structural Variation of Chromosomes in Autism Spectrum Disorder.

Project description:Chromosomal abnormalities have been identified in some individuals with Autism Spectrum Disorder (ASD), but their full etiologic role is unknown. Submicroscopic copy number variation (CNV) represents a considerable source of genetic variation in the human genome that contributes to phenotypic differences and disease susceptibility. To explore the contribution CNV imbalances in ASD, we genotyped unrelated ASD index cases using the Affymetrix GeneChip® 500K single nucleotide polymorphism (SNP) mapping array. Keywords: Whole Genome Mapping SNP Genotyping Array

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Affymetrix CytoScan HD for autism spectrum disorder in children

Project description:Autism spectrum disorder (ASD) is a complex heterogeneous developmental disease with a significant genetic background that is frequently caused by rare copy number variants (CNV). The aim of the study was to identify new candidate genes for ASD in the studied cohort of ASD-diagnosed patients. We used chromosomal microarray analysis (CMA) - a Cytoscan HD (Affymetrix, Santa Clara, CA, USA) to detect CNV in 87 ASD patients and their relatives and evaluated their clinical significance. Pathogenic and likely pathogenic mutations were identified by CMA in 8 and 9 ASD patients, respectively. CMA revealed 89 rare CNV: 8 pathogenic, 12 designated VOUS - likely pathogenic, 12 VOUS - uncertain, and 57 VOUS - likely benign or benign. CNV (pathogenic/VOUS-likely pathogenic/VOUS - uncertain) overlapping the same gene in more than one patient were observed in DOCK8 gene and PARK2 gene. This work presents new evidence about the possible roles of PARK2 and DOCK8 in the etiology of ASD, and suggests CTNNA2 as a candidate gene for ASD risk.

2018-05-25 | GSE114870 | GEO

Cortical organoids model early brain development disrupted by 16p11.2 CNV in autism

Project description:Reciprocal deletion and duplication of 16p11.2 is the most common copy number variation (CNV) associated with Autism Spectrum Disorder (ASD) and other developmental disorders, and has significant effect on brain size. We used cortical organoids derived from ASD cases to investigate neurodevelopmental pathways dysregulated by dosage changes of 16p11.2 CNV. We show that organoids recapitulate patients’ macrocephaly and microcephaly phenotypes. Deletions and duplications have “mirror” effects on cell proliferation, maturation and synapse number, consistent with “mirror” effects on brain development in humans. Neuronal migration was decreased in both, deletion and duplication organoids. Transcriptomic and proteomic profiling revealed synaptic defects and neuronal migration as key drivers of 16p11.2 functional effect. We implicate upregulation of small GTPase RhoA involved in regulation of cytoskeletal dynamics, neuron migration and neurite outgrowth as one of the pathways impacted by the 16p11.2 CNV in ASD. Treatment with the RhoA inhibitor Rhosin rescued neuron migration, but not synaptic defects. This study identifies pathways dysregulated by the 16p11.2 CNV during early neocortical development using cortical organoid models. Grant ID: Simons Foundation, #345469 Grant Title: Translational dysregulation of the RhoA pathway in autism Affiliation: University of California San Diego Name: Lilia M. Iakoucheva; Alysson R. Muotri

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Cerebral organoids model neocortical development disrupted by 16p11.2 CNV in autism

Project description:The 16p11.2 is the most common copy number variant (CNV) associated with Autism Spectrum Disorder (ASD). We used patient-derived cerebral organoids to investigate neurodevelopmental pathways dysregulated by dosage changes of 16p11.2 CNV. To investigate molecular dysregulation in DEL and DUP organoids, we carried out RNA sequencing and Tandem Mass Tag mass spectrometry (TMT-MS) on 1-month and 3-month organoids from the same samples. In proteomic analyses, we quantified a total of 6126 proteins in 1-month and 5481 proteins in 3-month organoids, with 13 and 11 proteins from within 16p11.2 CNV, respectively. Transcriptomic and proteomic profiling of organoids identifies the key drivers of functional effect by 16p11.2 CNV during neocortical development.

2019-12-19 | MSV000084727 | MassIVE

Transcriptome Profiling of patients with 16p11.2 rearrangements

Project description:The 600kb BP4-BP5 16p11.2 CNV (copy number variant) is associated with neuroanatomical, neurocognitive and metabolic disorders. These recurrent rearrangements are associated with reciprocal phenotypes such as obesity and underweight, macro- and microcephaly, as well as autism spectrum disorder (ASD) and schizophrenia. Here we interrogated the transcriptome of individuals carrying reciprocal CNVs in 16p11.2. The genome-wide transcript perturbations correlated with clinical endophenotypes of the CNV and were enriched for genes associated with ASD. We uncovered a significant correlation between copy number changes and expression levels of genes mutated in ciliopathies. Transcriptome profiles of lymphoblastoid cell lines of 50 16p11.2 deletion carriers, 31 16p11.2 duplication carriers and 17 controls.

2015-05-10 | E-GEOD-57802 | biostudies-arrayexpress

Use of clinical chromosomal microarray in Chinese patients with autism spectrum disorder - implications of a copy number variation involving dpp10 (CGX-12)

Project description:Background: Array-Comparative-Genomic-Hybridization (aCGH) is recommended as first-tier genetic test for children with autism spectrum disorder (ASD). However, result interpretation can be challenging as copy number variants (CNVs) in non-European ASD patients is not well studied. To address this literature gap, we report the CNV findings in a cohort of Chinese children with ASD. Methods DNA samples were obtained from 258 Chinese ASD patients recruited from a child assessment center between January 2011 and August 2014. aCGH was performed using NimbleGen-CGX-135k or Agilent-CGX 60k oligonucleotide array. Results were classified based on existing guidelines and literature. Results: Ten pathogenic and one likely-pathogenic CNVs were found in nine patients, with an overall diagnostic yield of 3.5%. A 138kb duplication involving 3â exons of DPP10 (hg[19]chr2:116534689-116672358), reported to be associated with ASD, was identified in one patient (0.39%). The same CNV was reported as variant of unknown significance (VUS) in DECIPHER database. Multiple individuals of typical development carrying a similar duplication were identified amongst our ancestry-matched control with frequency of 6/653 (0.92%) as well as from literature and genomic databases. Conclusions: DPP10 duplication is likely a benign CNV polymorphism enriched in Southern Chinese with population frequency of ~1%. This highlights the importance of using ancestry-matched controls in interpretation of aCGH findings.

2017-04-07 | E-MTAB-5665 | biostudies-arrayexpress

Use of clinical chromosomal microarray in Chinese patients with autism spectrum disorder - implications of a copy number variation involving dpp10 (Perkin Elmer CGX)

Project description:Background Array-Comparative-Genomic-Hybridization (aCGH) is recommended as first-tier genetic test for children with autism spectrum disorder (ASD). However, result interpretation can be challenging as copy number variants (CNVs) in non-European ASD patients is not well studied. To address this literature gap, we report the CNV findings in a cohort of Chinese children with ASD. Methods DNA samples were obtained from 258 Chinese ASD patients recruited from a child assessment center between January 2011 and August 2014. aCGH was performed using NimbleGen-CGX-135k or Agilent-CGX 60k oligonucleotide array. Results were classified based on existing guidelines and literature. Results Ten pathogenic and one likely-pathogenic CNVs were found in nine patients, with an overall diagnostic yield of 3.5%. A 138kb duplication involving 3â exons of DPP10 (hg[19]chr2:116534689-116672358), reported to be associated with ASD, was identified in one patient (0.39%). The same CNV was reported as variant of unknown significance (VUS) in DECIPHER database. Multiple individuals of typical development carrying a similar duplication were identified amongst our ancestry-matched control with frequency of 6/653 (0.92%) as well as from literature and genomic databases. Conclusions DPP10 duplication is likely a benign CNV polymorphism enriched in Southern Chinese with population frequency of ~1%. This highlights the importance of using ancestry-matched controls in interpretation of aCGH findings.

2017-04-07 | E-MTAB-5672 | biostudies-arrayexpress

Transcriptome Profiling of patients with 16p11.2 rearrangements

2015-05-10 | GSE57802 | GEO

Affymetrix SNP 6.0 array data for single cell multiple displacement amplification

Project description:Generating sufficient DNA for high-throughput genetic analysis has always been a challenge for clinical settings where the amount of source DNA is limited. Multiple displacement amplification (MDA) has been proposed as a promising candidate for such situations. Previous work with lower-resolution arrays confirmed the utility of single-cell MDA products for large-size (~30 Mb) genome variation screening. We tested the performance of single-cell MDA products on the SNP 6.0 arrays to examine the performance of single-cell MDA in SNP genotyping, copy number polymorphism, de novo copy number variation (CNV) and loss of heterozygosity (LOH) analysis. Our data show that for SNP genotyping, single-cell MDA did not obtain complete genome coverage or high sequence fidelity. For CNV calling, single-cell MDA introduced stochastic amplification artifacts in log2 ratio profiles, reducing the robustness of CNV calling; however, by adjusting smooth window size, it is still possible to analyze large chromosomal aberrations, and homozygous deletions as small as 500 kb can still be identified from the noisy log2 ratio profiles. Our results also suggest that even with a modified protocol (reduction of reaction volume, addition of a molecular crowding reagent, minimization of reaction time), single-cell MDA presented little improvement over the unmodified protocol, but by increasing the number of cells as template to 5–10 cells, SNP 6.0 array results comparable to those of 10 ng genomic DNA MDA could be obtained. Algorithms like PICNIC improved the CNV calling, suggesting that better algorithms can better utilize single-cell MDA array results.

2011-03-25 | GSE28132 | GEO

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