Chromosomal Aberrations in Pediatric Patients with Developmental Delay/Intellectual Disability: A Single-Center Clinical Investigation.

In this study, we performed an extensive assessment of the value of CMA for the diagnosis of children with ID/DD in China. Methods: A total of 633 patients diagnosed with DD/ID in West China Second University Hospital, Sichuan University, were recruited from January 2014 to March 2019. The patients were classified into 4 subgroups: isolated DD/ID, DD/ID with multiple congenital anomalies (MCA), isolated autism spectrum disorders (ASDs), and DD/ID with epilepsy. CMA was performed on Affymetrix 750K platform. Results: Among the 633 patients, 127 cases were identified as having pathogenic copy number variations (pCNVs) with an overall positive rate of 20.06%. Of the 127 cases with abnormal results, 76 cases had 35 types of microdeletion/microduplication syndromes (59.84%) including 5 cases caused by uniparental disomy (UPD), and 18 cases had unbalanced rearrangements (14.17%) including 10 cases inherited from parental balanced translocations or pericentric inversions. The diagnostic yields of pCNVs for the subgroups of isolated DD/ID, DD/ID with MCA, isolated ASD, and DD/ID with epilepsy were 18.07% (60/332), 34.90% (52/149), 3.70% (3/81), and 16.90% (12/71), respectively. The diagnostic yield of pCNVs in DD/ID patients with MCA was significantly higher than that of the other three subgroups, and the diagnostic yield of pCNVs in isolated ASD patients was significantly lower than that of the other three subgroups (p
Source: Biomed Res - Category: Research Authors: Tags: Biomed Res Int Source Type: research

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We present a patient with 17q12 deletion syndrome with significant atopy.
Source: Annals of Allergy, Asthma and Immunology - Category: Allergy & Immunology Authors: Source Type: research
Publication date: Available online 5 August 2019Source: The Lancet PsychiatryAuthor(s): Janneke R Zinkstok, Erik Boot, Anne S Bassett, Noboru Hiroi, Nancy J Butcher, Claudia Vingerhoets, Jacob A S Vorstman, Therese A M J van AmelsvoortSummary22q11.2 deletion syndrome is characterised by a well defined microdeletion that is associated with a high risk of neuropsychiatric disorders, including intellectual disability, schizophrenia, attention-deficit hyperactivity disorder, autism spectrum disorder, anxiety disorders, seizures and epilepsy, and early-onset Parkinson's disease. Preclinical and clinical data reveal substantial ...
Source: The Lancet Psychiatry - Category: Psychiatry Source Type: research
ConclusionThe presented patient is the second with a pathogenicMBD5 mutation in whom the course of disease is suggestive of early onset dementia starting in her fifth decade. These findings stress the importance of exome sequencing, also in elderly intellectually disabled patients, particularly in those with autism.
Source: Molecular Genetics & Genomic Medicine - Category: Genetics & Stem Cells Authors: Tags: ORIGINAL ARTICLE Source Type: research
Conclusions: Almost one-third of ASD patients in our sample had at least one fGID. The presence of fGID was associated with ID, sleep problems and with behavioral problems (as measured by the prescription of psychotropic drugs). This subsample of ASD patients with fGID deserves particular attention in future research projects, focusing on specific phenotypic characteristics and overlapping biological markers that may underlie both pathologies. Introduction Autism spectrum disorder (ASD) is a pervasive neurodevelopmental disorder characterized by impairments in social communication and restricted, repetitive patterns ...
Source: Frontiers in Psychiatry - Category: Psychiatry Source Type: research
We report on 2 brothers, aged 7.6 and 20 years, presenting with cognitive impairment, epilepsy, autistic features, hearing loss, and obesity. Array-CGH analysis demonstrated 2 rare CNVs in both siblings: a paternally inherited microdeletion of ∼145 kb at 3p22.1, disrupting theULK4 gene, and a maternally inherited microduplication of ∼117 kb at Xq21.1 including only theBRWD3 gene. As already described for other recurrent syndromes with variable phenotype, these findings are challenging in genetic counseling because of an evident variable penetrance. We discuss the possible correlations between the clinical phenotype...
Source: Cytogenetic and Genome Research - Category: Genetics & Stem Cells Source Type: research
We report on 2 brothers, aged 7.6 and 20 years, presenting with cognitive impairment, epilepsy, autistic features, hearing loss, and obesity. Array-CGH analysis demonstrated 2 rare CNVs in both siblings: a paternally inherited microdeletion of ∼145 kb at 3p22.1, disrupting theULK4 gene, and a maternally inherited microduplication of ∼117 kb at Xq21.1 including only theBRWD3 gene. As already described for other recurrent syndromes with variable phenotype, these findings are challenging in genetic counseling because of an evident variable penetrance. We discuss the possible correlations between the clinical phenotype...
Source: Cytogenetic and Genome Research - Category: Genetics & Stem Cells Source Type: research
Publication date: July 2018Source: The Lancet Psychiatry, Volume 5, Issue 7Author(s): Line Olsen, Thomas Sparsø, Shantel M Weinsheimer, Marcelo Bertalan Quintanilha Dos Santos, Wiktor Mazin, Anders Rosengren, Xabier Calle Sanchez, Louise K Hoeffding, Henriette Schmock, Marie Baekvad-Hansen, Jonas Bybjerg-Grauholm, Mark J Daly, Benjamin M Neale, Marianne G Pedersen, Esben Agerbo, Ole Mors, Anders Børglum, Merete Nordentoft, David M Hougaard, Preben Bo MortensenSummaryBackgroundAlthough the pathogenic nature of copy number variants (CNVs) on chromosome 22q11.2 has been recognised for decades, unbiased estimates...
Source: The Lancet Psychiatry - Category: Psychiatry Source Type: research
The MEF2 polypeptide C (MEF2C), a transcription factor, encodes for a protein that plays a key role in myogenesis, craniofacial development, and neurogenesis. In 2010, microarray studies identified a microdeletion of 5q14.3 region (critical region including the MEF2C gene) to be contributing to a phenotype including intellectual disability, epilepsy and other cerebral malformations. Both truncating single nucleotide variations and deletions of this gene demonstrate haploinsuffciency. Clinically, MEF2C-related disorders are characterized by severe intellectual disability with absent speech, autism, limited walking abilities...
Source: Cancer Genetics and Cytogenetics - Category: Genetics & Stem Cells Authors: Source Type: research
Copy-number variations (CNVs) are strong risk factors for neurodevelopmental and psychiatric disorders. The 15q13.3 microdeletion syndrome region contains up to ten genes and is associated with numerous conditions, including autism spectrum disorder (ASD), epilepsy, schizophrenia, and intellectual disability; however, the mechanisms underlying the pathogenesis of 15q13.3 microdeletion syndrome remain unknown. We combined whole-genome sequencing, human brain gene expression (proteome and transcriptome), and a mouse model with a syntenic heterozygous deletion (Df(h15q13)/+ mice) and determined that the microdeletion results ...
Source: The American Journal of Human Genetics - Category: Genetics & Stem Cells Authors: Tags: Article Source Type: research
AbstractSETD1B (SET domain containing 1B) is a component of SET1 histone methyltransferase complex, which mediates the methylation of histone H3 on lysine 4 (H3K4). Here, we describe two unrelated individuals with de novo variants inSETD1B identified by trio-based whole exome sequencing: c.5524C>T, p.(Arg1842Trp) and c.5575C>T, p.(Arg1859Cy). The two missense variants occurred at evolutionarily conserved amino acids and are located within the SET domain, which plays a pivotal role in catalyzing histone methylation. Previous studies have suggested that de novo microdeletions in the 12q24.3 region encompassingSETD1B we...
Source: Human Genetics - Category: Genetics & Stem Cells Source Type: research
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