1. Carbone PS, Murphy NA, Norlin C, Azor V, Sheng X, Young PC. {{Parent and Pediatrician Perspectives Regarding the Primary Care of Children with Autism Spectrum Disorders}}. {J Autism Dev Disord}. 2012.
Parents of children with autism spectrum disorders (ASD) (n = 144) and primary care providers (PCPs) (n = 144) completed similar surveys assessing the ability of the PCP to address ASD-specific needs. Parents also rated their PCP’s ability to deliver family-centered care. A majority of parents rated their PCP’s ability as « not good » in addressing 14 of 17 ASD-specific needs, while a majority of PCPs rated themselves as « good » in addressing 10 of 17 areas. On 7 of 17 items, parents rated their PCPs lower than PCPs rated themselves. Parents who reported receiving family-centered care were more likely to rate the PCP’s ability to meet ASD specific needs as « good ». Both parents and PCPs identified areas for improvement in caring for children with ASD.
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2. Clarke RA, Lee S, Eapen V. {{Pathogenetic model for Tourette syndrome delineates overlap with related neurodevelopmental disorders including Autism}}. {Transl Psychiatry}. 2012; 2: e158.
Tourette syndrome (TS) is a highly heritable neuropsychiatric disorder characterised by motor and vocal tics. Despite decades of research, the aetiology of TS has remained elusive. Recent successes in gene discovery backed by rapidly advancing genomic technologies have given us new insights into the genetic basis of the disorder, but the growing collection of rare and disparate findings have added confusion and complexity to the attempts to translate these findings into neurobiological mechanisms resulting in symptom genesis. In this review, we explore a previously unrecognised genetic link between TS and a competing series of trans-synaptic complexes (neurexins (NRXNs), neuroligins (NLGNs), leucine-rich repeat transmembrane proteins (LRRTMs), leucine rich repeat neuronals (LRRNs) and cerebellin precursor 2 (CBLN2)) that links it with autism spectrum disorder through neurodevelopmental pathways. The emergent neuropathogenetic model integrates all five genes so far found to be uniquely disrupted in TS into a single pathogenetic chain of events described in context with clinical and research implications.
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3. Ji L, Chauhan A, Chauhan V. {{Reduced activity of protein kinase C in the frontal cortex of subjects with regressive autism: relationship with developmental abnormalities}}. {Int J Biol Sci}. 2012; 8(7): 1075-84.
Autism is a neurodevelopmental disorder with unknown etiology. In some cases, typically developing children regress into clinical symptoms of autism, a condition known as regressive autism. Protein kinases are essential for G-protein-coupled receptor-mediated signal transduction, and are involved in neuronal functions, gene expression, memory, and cell differentiation. Recently, we reported decreased activity of protein kinase A (PKA) in the frontal cortex of subjects with regressive autism. In the present study, we analyzed the activity of protein kinase C (PKC) in the cerebellum and different regions of cerebral cortex from subjects with regressive autism, autistic subjects without clinical history of regression, and age-matched control subjects. In the frontal cortex of subjects with regressive autism, PKC activity was significantly decreased by 57.1% as compared to age-matched control subjects (p = 0.0085), and by 65.8% as compared to non-regressed autistic subjects (p = 0.0048). PKC activity was unaffected in the temporal, parietal and occipital cortices, and in the cerebellum in both autism groups, i.e., regressive and non-regressed autism as compared to control subjects. These results suggest brain region-specific alteration of PKC activity in the frontal cortex of subjects with regressive autism. Further studies showed a negative correlation between PKC activity and restrictive, repetitive and stereotyped pattern of behavior (r= -0.084, p = 0.0363) in autistic individuals, suggesting involvement of PKC in behavioral abnormalities in autism. These findings suggest that regression in autism may be attributed, in part, to alterations in G-protein-coupled receptor-mediated signal transduction involving PKA and PKC in the frontal cortex.
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4. Leavey A, Zwaigenbaum L, Heavner K, Burstyn I. {{Gestational Age at Birth and Risk of Autism Spectrum Disorders in Alberta, Canada}}. {J Pediatr}. 2012.
OBJECTIVE: To examine the association between autism spectrum disorders (ASD) and each completed week of gestation using a graphical method of presenting results at all possible categorizations of gestational age (GA). STUDY DESIGN: The risk of ASD in a total of 218 110 singleton live births with complete data from Alberta, Canada between 1998 and 2004 was examined through linkage to health insurance records. The relative risk of developing ASD according to the 21 dichotomizations of shorter gestation (GA </=23 weeks vs >23 weeks to </=43 weeks vs >43 weeks, in 1-week increments) was calculated using log-binomial regression and adjusted for fetal sex, socioeconomic status, and birth year. RESULTS: We observed a gradual increased risk of ASD with shorter gestation. Cutoffs only between 29 and 40 weeks clearly denoted an elevated risk of developing ASD compared with longer gestation, and the risk increased with earlier GA cutoff. The results were not affected by sex or measures of fetal growth. CONCLUSION: Our data confirm the role of shortened gestation in ASD risk. We warn against the use of prespecified or a data-driven GA cutoff, however; instead, we recommend systematically examining all plausible cutoffs for GA to avoid overstating the homogeneity of risk in children on either side of a given cutoff, as well as to increase the comparability of studies.
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5. Leventhal-Belfer L. {{Potential Ramifications of DSM-5 Classification of Autistic Disorders: Comments from a Clinician’s Perspective}}. {J Autism Dev Disord}. 2012.
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6. Tamura R, Kitamura H, Endo T, Abe R, Someya T. {{Decreased leftward bias of prefrontal activity in autism spectrum disorder revealed by functional near-infrared spectroscopy}}. {Psychiatry Res}. 2012.
Hemodynamic responses in rostral prefrontal cortex (RoPFC) were measured by functional near-infrared spectroscopy. Although performance level was equal, autistic patients showed a decrease in leftward bias of the balance between right and left RoPFC activity when compared with typically developing children when anatomical imitation was contrasted with mirror-image imitation.
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7. Ziats MN, Rennert OM. {{Aberrant Expression of Long Noncoding RNAs in Autistic Brain}}. {J Mol Neurosci}. 2012.
The autism spectrum disorders (ASD) have a significant hereditary component, but the implicated genetic loci are heterogeneous and complex. Consequently, there is a gap in understanding how diverse genomic aberrations all result in one clinical ASD phenotype. Gene expression studies from autism brain tissue have demonstrated that aberrantly expressed protein-coding genes may converge onto common molecular pathways, potentially reconciling the strong heritability and shared clinical phenotypes with the genomic heterogeneity of the disorder. However, the regulation of gene expression is extremely complex and governed by many mechanisms, including noncoding RNAs. Yet no study in ASD brain tissue has assessed for changes in regulatory long noncoding RNAs (lncRNAs), which represent a large proportion of the human transcriptome, and actively modulate mRNA expression. To assess if aberrant expression of lncRNAs may play a role in the molecular pathogenesis of ASD, we profiled over 33,000 annotated lncRNAs and 30,000 mRNA transcripts from postmortem brain tissue of autistic and control prefrontal cortex and cerebellum by microarray. We detected over 200 differentially expressed lncRNAs in ASD, which were enriched for genomic regions containing genes related to neurodevelopment and psychiatric disease. Additionally, comparison of differences in expression of mRNAs between prefrontal cortex and cerebellum within individual donors showed ASD brains had more transcriptional homogeneity. Moreover, this was also true of the lncRNA transcriptome. Our results suggest that further investigation of lncRNA expression in autistic brain may further elucidate the molecular pathogenesis of this disorder.
