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Autism etiology

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https://www.readbyqxmd.com/read/28438881/prevalence-of-congenital-cytomegalovirus-infection-assessed-through-viral-genome-detection-in-dried-blood-spots-in-children-with-autism-spectrum-disorders
#1
Ivan Gentile, Emanuela Zappulo, Maria Pia Riccio, Sandro Binda, Laura Bubba, Laura Pellegrinelli, Domenico Scognamiglio, Francesca Operto, Lucia Margari, Guglielmo Borgia, Carmela Bravaccio
BACKGROUND/AIM: Autism spectrum disorders (ASD) are neurodevelopmental disorders without a definitive etiology in most cases. Environmental factors, such as viral infections, have been linked with anomalies in brain growth, neuronal development, and functional connectivity. Congenital cytomegalovirus (CMV) infection has been associated with the onset of ASD in several case reports. The aim of this study was to evaluate the prevalence of congenital CMV infection in children with ASD and in healthy controls...
May 2017: In Vivo
https://www.readbyqxmd.com/read/28427329/cross-disorder-comparative-analysis-of-comorbid-conditions-reveals-novel-autism-candidate-genes
#2
Leticia Diaz-Beltran, Francisco J Esteban, Maya Varma, Alp Ortuzk, Maude David, Dennis P Wall
BACKGROUND: Numerous studies have highlighted the elevated degree of comorbidity associated with autism spectrum disorder (ASD). These comorbid conditions may add further impairments to individuals with autism and are substantially more prevalent compared to neurotypical populations. These high rates of comorbidity are not surprising taking into account the overlap of symptoms that ASD shares with other pathologies. From a research perspective, this suggests common molecular mechanisms involved in these conditions...
April 20, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28426285/the-yin-and-yang-of-autism-genetics-how-rare-de-novo-and-common-variations-affect-liability
#3
Pauline Chaste, Kathryn Roeder, Bernie Devlin
The etiology of autism spectrum disorder (ASD) is complex, involving both genetic and environmental contributions to individual and population-level liability. Early researchers hypothesized that ASD arises from polygenic inheritance, but later results, such as the identification of mutations in certain genes that are responsible for syndromes associated with ASD, led others to propose that de novo mutations of major effect would account for most cases. This yin and yang of monogenic causes and polygenic inheritance continues to this day...
April 19, 2017: Annual Review of Genomics and Human Genetics
https://www.readbyqxmd.com/read/28422133/gene-set-analysis-shows-association-between-fmrp-targets-and-autism-spectrum-disorder
#4
Arija Jansen, Gwen C Dieleman, August B Smit, Matthijs Verhage, Frank C Verhulst, Tinca J C Polderman, Danielle Posthuma
Autism spectrum disorder (ASD) is a heterogeneous group of disorders characterized by problems with social interaction, communication, and repetitive and restricted behavior. Despite its high heritability and the substantial progress made in elucidating genetic associations, the corresponding biological mechanisms are largely unknown. Our objective is to investigate the contribution of common genetic variation to biological pathways functionally involved in ASD. We conducted gene-set analyses to identify ASD-associated functional biological pathways using the statistical tools MAGMA and INRICH...
April 19, 2017: European Journal of Human Genetics: EJHG
https://www.readbyqxmd.com/read/28420080/delineating-the-common-biological-pathways-perturbed-by-asd-s-genetic-etiology-lessons-from-network-based-studies
#5
REVIEW
Oded Oron, Evan Elliott
In recent decades it has become clear that Autism Spectrum Disorder (ASD) possesses a diverse and heterogeneous genetic etiology. Aberrations in hundreds of genes have been associated with ASD so far, which include both rare and common variations. While one may expect that these genes converge on specific common molecular pathways, which drive the development of the core ASD characteristics, the task of elucidating these common molecular pathways has been proven to be challenging. Several studies have combined genetic analysis with bioinformatical techniques to uncover molecular mechanisms that are specifically targeted by autism-associated genetic aberrations...
April 14, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28419777/micrornas-as-biomarkers-for-psychiatric-disorders-with-a-focus-on-autism-spectrum-disorder-current-progress-in-genetic-association-studies-expression-profiling-and-translational-research
#6
REVIEW
Yubin Hu, Erik A Ehli, Dorret I Boomsma
MicroRNAs (miRNAs) are a group of small noncoding RNA molecules, 18-25 nucleotides in length, which can negatively regulate gene expression at the post-transcriptional level by binding to messenger RNAs. About half of all identified miRNAs in humans are expressed in the brain and display regulatory functions important for many biological processes related to the development of the central nervous system (CNS). Disruptions in miRNA biogenesis and miRNA-target interaction have been related to CNS diseases, including psychiatric disorders...
April 17, 2017: Autism Research: Official Journal of the International Society for Autism Research
https://www.readbyqxmd.com/read/28417440/developmental-neurotoxicity-of-traffic-related-air-pollution-focus-on-autism
#7
REVIEW
Lucio G Costa, Yu-Chi Chang, Toby B Cole
PURPOSE OF REVIEW: Epidemiological and animal studies suggest that air pollution may negatively affect the central nervous system (CNS) and contribute to CNS diseases. Traffic-related air pollution is a major contributor to global air pollution, and diesel exhaust (DE) is its most important component. RECENT FINDINGS: Several studies suggest that young individuals may be particularly susceptible to air pollution-induced neurotoxicity and that perinatal exposure may cause or contribute to developmental disabilities and behavioral abnormalities...
April 17, 2017: Current Environmental Health Reports
https://www.readbyqxmd.com/read/28413424/environmental-factors-influencing-the-risk-of-autism
#8
REVIEW
Padideh Karimi, Elahe Kamali, Seyyed Mohammad Mousavi, Mojgan Karahmadi
Autism is a developmental disability with age of onset in childhood (under 3 years old), which is characterized by definite impairments in social interactions, abnormalities in speech, and stereotyped pattern of behaviors. Due to the progress of autism in recent decades, a wide range of studies have been done to identify the etiological factors of autism. It has been found that genetic and environmental factors are both involved in autism pathogenesis. Hence, in this review article, a set of environmental factors involved in the occurrence of autism has been collected, and finally, some practical recommendations for reduction of the risk of this devastating disease in children are represented...
2017: Journal of Research in Medical Sciences: the Official Journal of Isfahan University of Medical Sciences
https://www.readbyqxmd.com/read/28392909/neurogenetic-analysis-of-childhood-disintegrative-disorder
#9
Abha R Gupta, Alexander Westphal, Daniel Y J Yang, Catherine A W Sullivan, Jeffrey Eilbott, Samir Zaidi, Avery Voos, Brent C Vander Wyk, Pam Ventola, Zainulabedin Waqar, Thomas V Fernandez, A Gulhan Ercan-Sencicek, Michael F Walker, Murim Choi, Allison Schneider, Tammy Hedderly, Gillian Baird, Hannah Friedman, Cara Cordeaux, Alexandra Ristow, Frederick Shic, Fred R Volkmar, Kevin A Pelphrey
BACKGROUND: Childhood disintegrative disorder (CDD) is a rare form of autism spectrum disorder (ASD) of unknown etiology. It is characterized by late-onset regression leading to significant intellectual disability (ID) and severe autism. Although there are phenotypic differences between CDD and other forms of ASD, it is unclear if there are neurobiological differences. METHODS: We pursued a multidisciplinary study of CDD (n = 17) and three comparison groups: low-functioning ASD (n = 12), high-functioning ASD (n = 50), and typically developing (n = 26) individuals...
2017: Molecular Autism
https://www.readbyqxmd.com/read/28392081/increased-extra-axial-cerebrospinal-fluid-in-high-risk-infants-who-later-develop-autism
#10
Mark D Shen, Sun Hyung Kim, Robert C McKinstry, Hongbin Gu, Heather C Hazlett, Christine W Nordahl, Robert W Emerson, Dennis Shaw, Jed T Elison, Meghan R Swanson, Vladimir S Fonov, Guido Gerig, Stephen R Dager, Kelly N Botteron, Sarah Paterson, Robert T Schultz, Alan C Evans, Annette M Estes, Lonnie Zwaigenbaum, Martin A Styner, David G Amaral, Joseph Piven, J Piven, H C Hazlett, C Chappell, S Dager, A Estes, D Shaw, K Botteron, R McKinstry, J Constantino, J Pruett, R Schultz, L Zwaigenbaum, J Elison, A C Evans, D L Collins, G B Pike, V Fonov, P Kostopoulos, S Das, G Gerig, M Styner, H Gu
BACKGROUND: We previously reported that infants who developed autism spectrum disorder (ASD) had increased cerebrospinal fluid (CSF) in the subarachnoid space (i.e., extra-axial CSF) from 6 to 24 months of age. We attempted to confirm and extend this finding in a larger independent sample. METHODS: A longitudinal magnetic resonance imaging study of infants at risk for ASD was carried out on 343 infants, who underwent neuroimaging at 6, 12, and 24 months. Of these infants, 221 were at high risk for ASD because of an older sibling with ASD, and 122 were at low risk with no family history of ASD...
March 6, 2017: Biological Psychiatry
https://www.readbyqxmd.com/read/28385162/neuroligin-3-r451c-mutation-alters-electroencephalography-spectral-activity-in-an-animal-model-of-autism-spectrum-disorders
#11
Jackie J Liu, Kevin P Grace, Richard L Horner, Miguel A Cortez, Yiwen Shao, Zhengping Jia
Human studies demonstrate that sleep impairment is a concurrent comorbidity of autism spectrum disorders (ASD), but its etiology remains largely uncertain. One of the prominent theories of ASD suggests that an imbalance in synaptic excitation/inhibition may contribute to various aspects of ASD, including sleep impairments. Following the identification of Nlgn3(R451C) mutation in patients with ASD, its effects on synaptic transmission and social behaviours have been examined extensively in the mouse model. However, the contributory role of this mutation to sleep impairments in ASD remains unknown...
April 7, 2017: Molecular Brain
https://www.readbyqxmd.com/read/28383189/maternal-hirsutism-and-autism-spectrum-disorders-in-offspring
#12
Brian K Lee, Stefan Arver, Linnea Widman, Renee M Gardner, Cecilia Magnusson, Christina Dalman, Kyriaki Kosidou
Because animal and human studies indicate that androgen exposure can influence neurodevelopment, it has been hypothesized that prenatal exposure to excess androgens may predispose to disorders with male-skewed ratio such as autism spectrum disorders (ASD). Therefore, maternal conditions characterized by hyperandrogenism such as polycystic ovary syndrome (PCOS) or hirsutism may be relevant to child ASD. We previously found in a large Swedish case-control study of 23,748 ASD cases and 208,796 matched controls that PCOS in mothers is associated with increased offspring risk of ASD...
April 6, 2017: Autism Research: Official Journal of the International Society for Autism Research
https://www.readbyqxmd.com/read/28373809/a-child-with-kabuki-syndrome-and-autism-spectrum-disorder
#13
Mehmet Sertçelik, Çağatay Uğur, Aynur Şahin Aközel, Cihat Kağan Gürkan
Kabuki syndrome (KS) is characterized by skeletal abnormalities, short stature, characteristic facial features, postnatal growth delay, and mental retardation. There are only a few case reports that present the coexistence of KS with autism spectrum disorder (ASD) in the literature. Herein we present the case of a boy with KS and ASD and discuss the possible shared etiologies. A 4-year-old boy was brought by his parents with complaints of no speech, hyperactivity, enuresis complex, temper tantrum, self-injury, and harming people or objects...
September 2016: Noro Psikiyatri Arsivi
https://www.readbyqxmd.com/read/28372982/neural-correlates-of-face-processing-in-etiologically-distinct-12-month-old-infants-at-high-risk-of-autism-spectrum-disorder
#14
Maggie W Guy, John E Richards, Bridgette L Tonnsen, Jane E Roberts
Neural correlates of face processing were examined in 12-month-olds at high-risk for autism spectrum disorder (ASD), including 21 siblings of children with ASD (ASIBs) and 15 infants with fragile X syndrome (FXS), as well as 21 low-risk (LR) controls. Event-related potentials were recorded to familiar and novel face and toy stimuli. All infants demonstrated greater N290 amplitude to faces than toys. At the Nc component, LR infants showed greater amplitude to novel stimuli than to their mother's face and own toy, whereas infants with FXS showed the opposite pattern of responses and ASIBs did not differentiate based on familiarity...
March 16, 2017: Developmental Cognitive Neuroscience
https://www.readbyqxmd.com/read/28371232/investigation-of-shank3-in-schizophrenia
#15
Ana de Sena Cortabitarte, Franziska Degenhardt, Jana Strohmaier, Maren Lang, Birgit Weiss, Ralph Roeth, Ina Giegling, Stefanie Heilmann-Heimbach, Andrea Hofmann, Dan Rujescu, Christine Fischer, Marcella Rietschel, Markus M Nöthen, Gudrun A Rappold, Simone Berkel
The postsynaptic scaffolding protein SHANK3 is essential for the normal function of glutamatergic synapses in the brain. Emerging evidence suggests that impaired plasticity of glutamatergic synapses contributes to the pathology of schizophrenia (SCZ). To investigate whether variants in the SHANK3 gene contribute to the etiology of SCZ, we sequenced SHANK3 in 500 affected individuals (cohort C1). In total, we identified 48 variants and compared them to European controls from the 1000 Genomes Project and the Exome Variant Server...
March 28, 2017: American Journal of Medical Genetics. Part B, Neuropsychiatric Genetics
https://www.readbyqxmd.com/read/28368272/consensus-statement-of-the-indian-academy-of-pediatrics-on-evaluation-and-management-of-autism-spectrum-disorder
#16
Samir Dalwai, Shabina Ahmed, Vrajesh Udani, Nandini Mundkur, S S Kamath, M K C Nair
JUSTIFICATION: Autism Spectrum Disorder (ASD) is a clinically heterogenous condition with a wide range of etiological factors and causing significant public health burden. ASD poses a serious developmental disadvantage to the child in the form of poor schooling, social function and adult productivity. Thus, framing evidence-based national guidelines is a pressing need. PROCESS: The meeting on formulation of national consensus guidelines on neurodevelopmental disorders was organized by Indian Academy of Paediatrics in Mumbai on 18th and 19th December 2015...
March 29, 2017: Indian Pediatrics
https://www.readbyqxmd.com/read/28360521/rapamycin-modulated-brain-derived-neurotrophic-factor-and-b-cell-lymphoma-2-to-mitigate-autism-spectrum-disorder-in-rats
#17
Jie Zhang, Li-Ming Liu, Jin-Feng Ni
The number of children suffered from autism spectrum disorder (ASD) is increasing dramatically. However, the etiology of ASD is not well known. This study employed mammalian target of rapamycin inhibitor rapamycin to explore its effect on ASD and provided new therapeutic strategies for ASD. ASD rat model was constructed and valproic acid (VPA) was injected intraperitoneally into rats on pregnancy day 12.5. Offspring from VPA group were divided into ASD group and ASD + rapamycin (ASD + RAPA) group. Compared with normal group, the frequency and duration of social behavior and straight times of ASD group were shortened, but the grooming times were extended...
2017: Neuropsychiatric Disease and Treatment
https://www.readbyqxmd.com/read/28357155/analytical-and-clinical-validity-study-of-firststepdx-plus-a-chromosomal-microarray-optimized-for-patients-with-neurodevelopmental-conditions
#18
Charles Hensel, Rena Vanzo, Megan Martin, Sean Dixon, Christophe Lambert, Brynn Levy, Lesa Nelson, Andy Peiffer, Karen S Ho, Patricia Rushton, Moises Serrano, Sarah South, Kenneth Ward, Edward Wassman
INTRODUCTION: Chromosomal microarray analysis (CMA) is recognized as the first-tier test in the genetic evaluation of children with developmental delays, intellectual disabilities, congenital anomalies and autism spectrum disorders of unknown etiology. ARRAY DESIGN: To optimize detection of clinically relevant copy number variants associated with these conditions, we designed a whole-genome microarray, FirstStep(Dx) PLUS (FSDX). A set of 88,435 custom probes was added to the Affymetrix CytoScanHD platform targeting genomic regions strongly associated with these conditions...
February 27, 2017: PLoS Currents
https://www.readbyqxmd.com/read/28344758/no-evidence-of-early-head-circumference-enlargements-in-children-later-diagnosed-with-autism-in-israel
#19
Ilan Dinstein, Shlomi Haar, Shir Atsmon, Hen Schtaerman
BACKGROUND: Large controversy exists regarding the potential existence and clinical significance of larger brain volumes in toddlers who later develop autism. Assessing this relationship is important for determining the clinical utility of early head circumference (HC) measures and for assessing the validity of the early overgrowth hypothesis of autism, which suggests that early accelerated brain development may be a hallmark of the disorder. METHODS: We performed a retrospective comparison of HC, height, and weight measurements between 66 toddlers who were later diagnosed with autism and 66 matched controls...
2017: Molecular Autism
https://www.readbyqxmd.com/read/28344757/leveraging-blood-serotonin-as-an-endophenotype-to-identify-de-novo-and-rare-variants-involved-in-autism
#20
Rui Chen, Lea K Davis, Stephen Guter, Qiang Wei, Suma Jacob, Melissa H Potter, Nancy J Cox, Edwin H Cook, James S Sutcliffe, Bingshan Li
BACKGROUND: Autism spectrum disorder (ASD) is one of the most highly heritable neuropsychiatric disorders, but underlying molecular mechanisms are still unresolved due to extreme locus heterogeneity. Leveraging meaningful endophenotypes or biomarkers may be an effective strategy to reduce heterogeneity to identify novel ASD genes. Numerous lines of evidence suggest a link between hyperserotonemia, i.e., elevated serotonin (5-hydroxytryptamine or 5-HT) in whole blood, and ASD. However, the genetic determinants of blood 5-HT level and their relationship to ASD are largely unknown...
2017: Molecular Autism
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