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1.
Cell ; 186(18): 3747-3752, 2023 08 31.
Artículo en Inglés | MEDLINE | ID: mdl-37657415

RESUMEN

A paradigm shift in research culture is required to ease perceived tensions between autistic people and the biomedical research community. As a group of autistic and non-autistic scientists and stakeholders, we contend that through participatory research, we can reject a deficit-based conceptualization of autism while building a shared vision for a neurodiversity-affirmative biomedical research paradigm.


Asunto(s)
Trastorno Autístico , Investigación Biomédica , Humanos , Investigación Biomédica/ética , Conducta , Investigación Participativa Basada en la Comunidad
2.
Cell ; 180(3): 568-584.e23, 2020 02 06.
Artículo en Inglés | MEDLINE | ID: mdl-31981491

RESUMEN

We present the largest exome sequencing study of autism spectrum disorder (ASD) to date (n = 35,584 total samples, 11,986 with ASD). Using an enhanced analytical framework to integrate de novo and case-control rare variation, we identify 102 risk genes at a false discovery rate of 0.1 or less. Of these genes, 49 show higher frequencies of disruptive de novo variants in individuals ascertained to have severe neurodevelopmental delay, whereas 53 show higher frequencies in individuals ascertained to have ASD; comparing ASD cases with mutations in these groups reveals phenotypic differences. Expressed early in brain development, most risk genes have roles in regulation of gene expression or neuronal communication (i.e., mutations effect neurodevelopmental and neurophysiological changes), and 13 fall within loci recurrently hit by copy number variants. In cells from the human cortex, expression of risk genes is enriched in excitatory and inhibitory neuronal lineages, consistent with multiple paths to an excitatory-inhibitory imbalance underlying ASD.


Asunto(s)
Trastorno Autístico/genética , Corteza Cerebral/crecimiento & desarrollo , Secuenciación del Exoma/métodos , Regulación del Desarrollo de la Expresión Génica , Neurobiología/métodos , Estudios de Casos y Controles , Linaje de la Célula , Estudios de Cohortes , Exoma , Femenino , Frecuencia de los Genes , Predisposición Genética a la Enfermedad , Humanos , Masculino , Mutación Missense , Neuronas/metabolismo , Fenotipo , Factores Sexuales , Análisis de la Célula Individual/métodos
3.
Nat Rev Genet ; 21(6): 367-376, 2020 06.
Artículo en Inglés | MEDLINE | ID: mdl-32317787

RESUMEN

Autism spectrum disorder (ASD) is often grouped with other brain-related phenotypes into a broader category of neurodevelopmental disorders (NDDs). In clinical practice, providers need to decide which genes to test in individuals with ASD phenotypes, which requires an understanding of the level of evidence for individual NDD genes that supports an association with ASD. Consensus is currently lacking about which NDD genes have sufficient evidence to support a relationship to ASD. Estimates of the number of genes relevant to ASD differ greatly among research groups and clinical sequencing panels, varying from a few to several hundred. This Roadmap discusses important considerations necessary to provide an evidence-based framework for the curation of NDD genes based on the level of information supporting a clinically relevant relationship between a given gene and ASD.


Asunto(s)
Trastorno del Espectro Autista/genética , Medicina Basada en la Evidencia/métodos , Estudios de Asociación Genética/métodos , Encéfalo/crecimiento & desarrollo , Cognición/fisiología , Humanos , Discapacidad Intelectual/genética
4.
Trends Genet ; 38(2): 140-151, 2022 02.
Artículo en Inglés | MEDLINE | ID: mdl-34364706

RESUMEN

Rare copy-number variants (CNVs) associated with neurodevelopmental disorders (NDDs), i.e., ND-CNVs, provide an insight into the neurobiology of NDDs and, potentially, a link between biology and clinical outcomes. However, ND-CNVs are characterised by incomplete penetrance resulting in heterogeneous carrier phenotypes, ranging from non-affected to multimorbid psychiatric, neurological, and physical phenotypes. Recent evidence indicates that other variants in the genome, or 'other hits', may partially explain the variable expressivity of ND-CNVs. These may be other rare variants or the aggregated effects of common variants that modify NDD risk. Here we discuss the recent findings, current questions, and future challenges relating to other hits research in the context of ND-CNVs and their potential for improved clinical diagnostics and therapeutics for ND-CNV carriers.


Asunto(s)
Variaciones en el Número de Copia de ADN , Trastornos del Neurodesarrollo , Variaciones en el Número de Copia de ADN/genética , Predisposición Genética a la Enfermedad , Humanos , Trastornos del Neurodesarrollo/genética , Fenotipo
5.
Mol Psychiatry ; 27(4): 2114-2125, 2022 04.
Artículo en Inglés | MEDLINE | ID: mdl-35136228

RESUMEN

Small average differences in the left-right asymmetry of cerebral cortical thickness have been reported in individuals with autism spectrum disorder (ASD) compared to typically developing controls, affecting widespread cortical regions. The possible impacts of these regional alterations in terms of structural network effects have not previously been characterized. Inter-regional morphological covariance analysis can capture network connectivity between different cortical areas at the macroscale level. Here, we used cortical thickness data from 1455 individuals with ASD and 1560 controls, across 43 independent datasets of the ENIGMA consortium's ASD Working Group, to assess hemispheric asymmetries of intra-individual structural covariance networks, using graph theory-based topological metrics. Compared with typical features of small-world architecture in controls, the ASD sample showed significantly altered average asymmetry of networks involving the fusiform, rostral middle frontal, and medial orbitofrontal cortex, involving higher randomization of the corresponding right-hemispheric networks in ASD. A network involving the superior frontal cortex showed decreased right-hemisphere randomization. Based on comparisons with meta-analyzed functional neuroimaging data, the altered connectivity asymmetry particularly affected networks that subserve executive functions, language-related and sensorimotor processes. These findings provide a network-level characterization of altered left-right brain asymmetry in ASD, based on a large combined sample. Altered asymmetrical brain development in ASD may be partly propagated among spatially distant regions through structural connectivity.


Asunto(s)
Trastorno del Espectro Autista , Encéfalo , Mapeo Encefálico , Corteza Cerebral/diagnóstico por imagen , Humanos , Imagen por Resonancia Magnética/métodos , Vías Nerviosas
6.
BMC Public Health ; 23(1): 2535, 2023 12 18.
Artículo en Inglés | MEDLINE | ID: mdl-38110935

RESUMEN

BACKGROUND: Despite a flux of global initiatives to increase and sustain breastfeeding rates, challenges persist. The decision to commence and sustain breastfeeding is influenced by multiple, complex factors. Feelings of social embarrassment, shame, fear of judgement, and lack of confidence when breastfeeding in public, compound women's decisions to breastfeed and may result in formula feeding or early cessation of breastfeeding. A greater understanding of where and how women feel most comfortable when breastfeeding in public can assist in designing interventions to support the initiation and continuation of breastfeeding. METHODS: A cross-sectional survey was conducted with women living in Australia (n = 10,910), Sweden (n = 1,520), and Ireland (n = 1,835), who were currently breastfeeding or who had breastfed within the previous two years. Our aim was to explore where, and how often women breastfeed in public and to compare their levels of comfort when breastfeeding in public. Data were collected in 2018 using an anonymous online survey over a four-week period in Ireland, Australia, and Sweden, and were analyzed using SPSS Version 25. RESULTS: Most respondents were highly educated, with over 70% in each country reporting having a university or college degree. Observing women breastfeeding in public was more commonly reported to be a weekly or daily occurrence in Sweden (24.5%) and Australia (28%), than in Ireland (13.3%). Women in the participating countries reported breastfeeding in public most commonly whenever their babies needed feeding. Very few women never or rarely breastfed publicly. Coffee shops/cafes, restaurants, and parks were the most popular locations. In all three countries, partners were reported to be very supportive of breastfeeding in public, which enhanced breastfeeding women's comfort levels. When asked to score out of a maximum comfort level of 10, women reported higher mean levels of comfort when breastfeeding in front of strangers (Ireland M = 7.33, Australia M = 6.58, Sweden M = 6.75) than with those known to them, particularly in front of their father-in-law (Ireland M = 5.44, Australia M = 5.76, Sweden M = 6.66 out of 10), who scored lowest in terms of women's comfort levels. CONCLUSION: This study offers important insights into the experiences and comfort levels of women breastfeeding in public. Limitations include the anonymous nature of the surveys, thus preventing follow-up, and variances in terminology used to describe locations across the three settings. Recommendations are made for research to determine the relationships between the frequency of breastfeeding in public and breastfeeding women's perceived comfort levels, the influence of family members' perceptions of breastfeeding in public and women's experiences, and the experience of women who feel uncomfortable while breastfeeding in public, with a view to developing support measures.


Asunto(s)
Lactancia Materna , Cognición , Lactante , Femenino , Humanos , Australia , Suecia , Estudios Transversales , Madres
7.
Hum Brain Mapp ; 43(1): 37-55, 2022 01.
Artículo en Inglés | MEDLINE | ID: mdl-32420680

RESUMEN

Neuroimaging has been extensively used to study brain structure and function in individuals with attention deficit/hyperactivity disorder (ADHD) and autism spectrum disorder (ASD) over the past decades. Two of the main shortcomings of the neuroimaging literature of these disorders are the small sample sizes employed and the heterogeneity of methods used. In 2013 and 2014, the ENIGMA-ADHD and ENIGMA-ASD working groups were respectively, founded with a common goal to address these limitations. Here, we provide a narrative review of the thus far completed and still ongoing projects of these working groups. Due to an implicitly hierarchical psychiatric diagnostic classification system, the fields of ADHD and ASD have developed largely in isolation, despite the considerable overlap in the occurrence of the disorders. The collaboration between the ENIGMA-ADHD and -ASD working groups seeks to bring the neuroimaging efforts of the two disorders closer together. The outcomes of case-control studies of subcortical and cortical structures showed that subcortical volumes are similarly affected in ASD and ADHD, albeit with small effect sizes. Cortical analyses identified unique differences in each disorder, but also considerable overlap between the two, specifically in cortical thickness. Ongoing work is examining alternative research questions, such as brain laterality, prediction of case-control status, and anatomical heterogeneity. In brief, great strides have been made toward fulfilling the aims of the ENIGMA collaborations, while new ideas and follow-up analyses continue that include more imaging modalities (diffusion MRI and resting-state functional MRI), collaborations with other large databases, and samples with dual diagnoses.


Asunto(s)
Trastorno por Déficit de Atención con Hiperactividad , Trastorno del Espectro Autista , Encéfalo , Neuroimagen , Trastorno por Déficit de Atención con Hiperactividad/diagnóstico por imagen , Trastorno por Déficit de Atención con Hiperactividad/patología , Trastorno del Espectro Autista/diagnóstico por imagen , Trastorno del Espectro Autista/patología , Encéfalo/diagnóstico por imagen , Encéfalo/patología , Humanos , Estudios Multicéntricos como Asunto , Neurociencias
8.
BMC Neurosci ; 22(1): 56, 2021 09 15.
Artículo en Inglés | MEDLINE | ID: mdl-34525970

RESUMEN

BACKGROUND: NRXN1 deletions are identified as one of major rare risk factors for autism spectrum disorder (ASD) and other neurodevelopmental disorders. ASD has 30% co-morbidity with epilepsy, and the latter is associated with excessive neuronal firing. NRXN1 encodes hundreds of presynaptic neuro-adhesion proteins categorized as NRXN1α/ß/γ. Previous studies on cultured cells show that the short NRXN1ß primarily exerts excitation effect, whereas the long NRXN1α which is more commonly deleted in patients involves in both excitation and inhibition. However, patient-derived models are essential for understanding functional consequences of NRXN1α deletions in human neurons. We recently derived induced pluripotent stem cells (iPSCs) from five controls and three ASD patients carrying NRXN1α+/- and showed increased calcium transients in patient neurons. METHODS: In this study we investigated the electrophysiological properties of iPSC-derived cortical neurons in control and ASD patients carrying NRXN1α+/- using patch clamping. Whole genome RNA sequencing was carried out to further understand the potential underlying molecular mechanism. RESULTS: NRXN1α+/- cortical neurons were shown to display larger sodium currents, higher AP amplitude and accelerated depolarization time. RNASeq analyses revealed transcriptomic changes with significant upregulation glutamatergic synapse and ion channels/transporter activity including voltage-gated potassium channels (GRIN1, GRIN3B, SLC17A6, CACNG3, CACNA1A, SHANK1), which are likely to couple with the increased excitability in NRXN1α+/- cortical neurons. CONCLUSIONS: Together with recent evidence of increased calcium transients, our results showed that human NRXN1α+/- isoform deletions altered neuronal excitability and non-synaptic function, and NRXN1α+/- patient iPSCs may be used as an ASD model for therapeutic development with calcium transients and excitability as readouts.


Asunto(s)
Trastorno del Espectro Autista/genética , Proteínas de Unión al Calcio/genética , Redes Reguladoras de Genes/fisiología , Células Madre Pluripotentes Inducidas/fisiología , Moléculas de Adhesión de Célula Nerviosa/genética , Neuronas/fisiología , Adolescente , Trastorno del Espectro Autista/metabolismo , Proteínas de Unión al Calcio/metabolismo , Línea Celular , Células Cultivadas , Niño , Preescolar , Femenino , Humanos , Masculino , Moléculas de Adhesión de Célula Nerviosa/metabolismo , Adulto Joven
9.
Cytotherapy ; 23(9): 852-860, 2021 09.
Artículo en Inglés | MEDLINE | ID: mdl-33941482

RESUMEN

BACKGROUND AIMS: Next-generation immune cell therapy products will require complex modifications using engineering technologies that can maintain high levels of cell functionality. Non-viral engineering methods have the potential to address limitations associated with viral vectors. However, while electroporation is the most widely used non-viral modality, concerns about its effects on cell functionality have led to the exploration of alternative approaches. Here the authors have examined the suitability of the Solupore non-viral delivery system for engineering primary human T cells for cell therapy applications. METHODS: The Solupore system was used to deliver messenger RNA (mRNA) and clustered regularly interspaced short palindromic repeats (CRISPR)/CRISPR-associated protein 9 (Cas9) guide RNA ribonucleoprotein (RNP) cargos to T cells, and efficiency was measured by flow cytometry. Cell perturbation was assessed by immune gene expression profiling, including an electroporation comparator. In vitro and in vivo cytotoxicity of chimeric antigen receptor (CAR) T cells generated using the Solupore system was evaluated using a real-time cellular impedance assay and a Raji-luciferase mouse tumor model, respectively. RESULTS: Efficient transfection was demonstrated through delivery of mRNA and CRISPR CAS9 RNP cargos individually, simultaneously and sequentially using the Solupore system while consistently maintaining high levels of cell viability. Gene expression profiling revealed minimal alteration in immune gene expression, demonstrating the low level of perturbation experienced by the cells during this transfection process. By contrast, electroporation resulted in substantial changes in immune gene expression in T cells. CAR T cells generated using the Solupore system exhibited efficient cytotoxicity against target cancer cells in vitro and in vivo. CONCLUSIONS: The Solupore system is a non-viral means of simply, rapidly and efficiently delivering cargos to primary human immune cells with retention of high cell viability and functionality.


Asunto(s)
Vectores Genéticos , Linfocitos T , Animales , Tratamiento Basado en Trasplante de Células y Tejidos , Electroporación , Humanos , Ratones , Transfección
10.
J Med Genet ; 57(5): 347-355, 2020 05.
Artículo en Inglés | MEDLINE | ID: mdl-31932357

RESUMEN

BACKGROUND: Intragenic NRXN1 deletions are susceptibility variants for neurodevelopmental disorders; however, their clinical interpretation is often unclear. Therefore, a literature study and an analysis of 43 previously unpublished deletions are provided. METHODS: The literature cohort covered 629 heterozygous NRXN1 deletions: 148 in controls, 341 in probands and 140 in carrier relatives, and was used for clinical hypothesis testing. Exact breakpoint determination was performed for 43 in-house deletions. RESULTS: The prevalence of exonic NRXN1 deletions in controls was ~1/3000 as compared with ~1/800 in patients with neurodevelopmental/neuropsychiatric disorders. The differential distribution of deletions across the gene between controls and probands allowed to distinguish distinct areas within the gene. Exon 6-24 deletions appeared only twice in over 100000 control individuals, had an estimated penetrance for neurodevelopmental disorders of 32.43%, a de novo rate of 50% and segregated mainly with intellectual disability (ID) and schizophrenia. In contrast, exon 1-5 deletions appeared in 20 control individuals, had an estimated penetrance of 12.59%, a de novo rate of 32.5% and were reported with a broad range of neurodevelopmental phenotypes. Exact breakpoint determination revealed six recurrent intron 5 deletions. CONCLUSION: Exon 6-24 deletions have a high penetrance and are mainly associated with ID and schizophrenia. In contrast, the actual contribution of exon 1-5 deletions to a neurodevelopmental/neuropsychiatric disorder in an individual patient and family remains very difficult to assess. To enhance the clinical interpretation, this study provides practical considerations for counselling and an interactive table for comparing a deletion of interest with the available literature data.


Asunto(s)
Proteínas de Unión al Calcio/genética , Eliminación de Gen , Discapacidad Intelectual/genética , Moléculas de Adhesión de Célula Nerviosa/genética , Esquizofrenia/genética , Anomalías Múltiples/epidemiología , Anomalías Múltiples/genética , Anomalías Múltiples/patología , Exones , Femenino , Predisposición Genética a la Enfermedad , Humanos , Discapacidad Intelectual/epidemiología , Discapacidad Intelectual/patología , Masculino , Trastornos del Neurodesarrollo/epidemiología , Trastornos del Neurodesarrollo/genética , Trastornos del Neurodesarrollo/patología , Esquizofrenia/epidemiología , Esquizofrenia/patología
11.
Genomics ; 112(6): 5136-5142, 2020 11.
Artículo en Inglés | MEDLINE | ID: mdl-32941983

RESUMEN

Genomic technologies have accelerated research progress in autism spectrum disorder (ASD) genomics and promises to further transform our understanding of the genetic basis of this neurodevelopmental disorder. Here we review the current evidence for the genetic basis of ASD, present the progress of large-scale studies to date and highlight the potential of genomic technologies. In particular, we discuss evidence for the importance of identifying rare genetic variants in family-based studies. Genomics is a key feature of future healthcare and our review illustrates it's potential to improve our biological understanding of neurodevelopmental disorders, and to ultimately aid ASD diagnosis, inform medical decision making and establish genomics as central to personalised medicine.


Asunto(s)
Trastorno del Espectro Autista/genética , Trastorno del Espectro Autista/diagnóstico , Dosificación de Gen , Variación Genética , Genómica , Secuenciación de Nucleótidos de Alto Rendimiento , Humanos , Trastornos Mentales/genética , Secuenciación del Exoma , Secuenciación Completa del Genoma
12.
J Intellect Disabil ; : 1744629521995378, 2021 Apr 19.
Artículo en Inglés | MEDLINE | ID: mdl-33866895

RESUMEN

Chromosomal abnormalities are now considered a common cause of intellectual disability. With increased genetic testing, phenotyping and technological advancements, many new syndromes have been identified. This review sought to explore parental stress and adjustment in the context of rare genetic syndromes to evaluate their clinical impact. A systematic review of English peer-reviewed literature across three databases (PsycINFO, Medline, CINAHL) was completed and 69 articles were included. Parents of children with rare genetic syndromes experienced greater distress relative to other disabilities. Differences in parental wellbeing were syndrome-specific relative to ASD thus demonstrating the need to consider the contribution of syndrome-specific phenotypes. Child emotional and behavioural difficulties were the most consistent predictor of parental distress. Research reflecting other factors such as physical health, syndrome-specific behaviours, benefit finding and, parental appraisal in the context of a rare genetic aetiology is required in order to support parental adjustment in these conditions.

13.
Br J Psychiatry ; 216(5): 275-279, 2020 05.
Artículo en Inglés | MEDLINE | ID: mdl-31964429

RESUMEN

BACKGROUND: Copy number variants (CNVs) play a significant role in disease pathogenesis in a small subset of individuals with schizophrenia (~2.5%). Chromosomal microarray testing is a first-tier genetic test for many neurodevelopmental disorders. Similar testing could be useful in schizophrenia. AIMS: To determine whether clinically identifiable phenotypic features could be used to successfully model schizophrenia-associated (SCZ-associated) CNV carrier status in a large schizophrenia cohort. METHOD: Logistic regression and receiver operating characteristic (ROC) curves tested the accuracy of readily identifiable phenotypic features in modelling SCZ-associated CNV status in a discovery data-set of 1215 individuals with psychosis. A replication analysis was undertaken in a second psychosis data-set (n = 479). RESULTS: In the discovery cohort, specific learning disorder (OR = 8.12; 95% CI 1.16-34.88, P = 0.012), developmental delay (OR = 5.19; 95% CI 1.58-14.76, P = 0.003) and comorbid neurodevelopmental disorder (OR = 5.87; 95% CI 1.28-19.69, P = 0.009) were significant independent variables in modelling positive carrier status for a SCZ-associated CNV, with an area under the ROC (AUROC) of 74.2% (95% CI 61.9-86.4%). A model constructed from the discovery cohort including developmental delay and comorbid neurodevelopmental disorder variables resulted in an AUROC of 83% (95% CI 52.0-100.0%) for the replication cohort. CONCLUSIONS: These findings suggest that careful clinical history taking to document specific neurodevelopmental features may be informative in screening for individuals with schizophrenia who are at higher risk of carrying known SCZ-associated CNVs. Identification of genomic disorders in these individuals is likely to have clinical benefits similar to those demonstrated for other neurodevelopmental disorders.


Asunto(s)
Variaciones en el Número de Copia de ADN/genética , Anamnesis , Esquizofrenia/diagnóstico , Esquizofrenia/genética , Femenino , Humanos , Modelos Logísticos , Masculino , Trastornos del Neurodesarrollo/diagnóstico , Trastornos del Neurodesarrollo/genética , Curva ROC , Estudios Retrospectivos , Adulto Joven
14.
Nature ; 515(7526): 209-15, 2014 Nov 13.
Artículo en Inglés | MEDLINE | ID: mdl-25363760

RESUMEN

The genetic architecture of autism spectrum disorder involves the interplay of common and rare variants and their impact on hundreds of genes. Using exome sequencing, here we show that analysis of rare coding variation in 3,871 autism cases and 9,937 ancestry-matched or parental controls implicates 22 autosomal genes at a false discovery rate (FDR) < 0.05, plus a set of 107 autosomal genes strongly enriched for those likely to affect risk (FDR < 0.30). These 107 genes, which show unusual evolutionary constraint against mutations, incur de novo loss-of-function mutations in over 5% of autistic subjects. Many of the genes implicated encode proteins for synaptic formation, transcriptional regulation and chromatin-remodelling pathways. These include voltage-gated ion channels regulating the propagation of action potentials, pacemaking and excitability-transcription coupling, as well as histone-modifying enzymes and chromatin remodellers-most prominently those that mediate post-translational lysine methylation/demethylation modifications of histones.


Asunto(s)
Trastornos Generalizados del Desarrollo Infantil/genética , Cromatina/genética , Predisposición Genética a la Enfermedad/genética , Mutación/genética , Sinapsis/metabolismo , Transcripción Genética/genética , Secuencia de Aminoácidos , Trastornos Generalizados del Desarrollo Infantil/patología , Cromatina/metabolismo , Ensamble y Desensamble de Cromatina , Exoma/genética , Femenino , Mutación de Línea Germinal/genética , Humanos , Masculino , Datos de Secuencia Molecular , Mutación Missense/genética , Red Nerviosa/metabolismo , Oportunidad Relativa
16.
J Neuroeng Rehabil ; 16(1): 87, 2019 07 12.
Artículo en Inglés | MEDLINE | ID: mdl-31299981

RESUMEN

BACKGROUND: Fragile X Associated Tremor/Ataxia Syndrome (FXTAS) is a neurodegenerative movement disorder characterized by tremor, ataxic gait, and balance issues resulting from a premutation of the Fragile X Mental Retardation 1 (FMR1) gene. No biomarkers have yet been identified to allow early diagnosis of FXTAS, however, recent studies have reported subtle issues in the stability of younger premutation carriers, before disease onset. This study investigates the efficacy of multiscale entropy analysis (MSE) in detecting early changes in the motor system of premutation carriers without FXTAS. METHODS: Sway complexity of 12 female Premutation carriers and 15 healthy Controls were measured under four conditions: eyes open, closed, and two dual-task conditions. A Sustained Attention Response Task (SART) and a working memory based N-Back task were employed to increase cognitive load while standing on the forceplate. A Complexity Index (Ci) was calculated for anterior-posterior (AP) and mediolateral (ML) sway. Independent t-tests were used to assess between-group differences and Oneway repeated measures ANOVA were used to assess within group differences with Bonferroni corrections to adjust for multiple comparisons. RESULTS: Group performances were comparable with eyes open and closed conditions. The Carrier group's Ci was consistent across tasks and conditions while the Control group's AP Ci increased significantly during the cognitive dual-task (p = 0.001). There was also a strong correlation between CGG repeat length and complexity for the Carrier group (p = 0.004). SIGNIFICANCE: Increased sway complexity is believed to stem from reallocation of attention to facilitate the increased cognitive demands of dual-tasks. Carriers' complexity did not change during dual-tasks, possibly indicating capacity interference and inefficient division of attention. Lower sway complexity in carriers suggests diminished adaptive capacity under stress as well as degradation of motor functioning. Therefore, sway complexity may be a useful tool in identifying early functional decline in FMR1 premutation carriers as well as monitoring progression towards disease onset.


Asunto(s)
Ataxia/diagnóstico , Diagnóstico Precoz , Síndrome del Cromosoma X Frágil/diagnóstico , Equilibrio Postural/fisiología , Temblor/diagnóstico , Anciano , Atención/fisiología , Femenino , Humanos , Memoria a Corto Plazo/fisiología , Persona de Mediana Edad
17.
Eur J Neurosci ; 47(6): 652-661, 2018 03.
Artículo en Inglés | MEDLINE | ID: mdl-28741714

RESUMEN

Core features of autism spectrum disorder (ASD) may be underpinned by disrupted functional and structural neural connectivity. Abnormal fronto-parietal functional connectivity has been widely reported in the literature; this may be underpinned by disrupted microstructural organisation of white matter. The superior longitudinal fasciculus (SLF) is a major fronto-parietal white matter tract, the structure of which has been little studied in ASD. The fronto-parietal projections of this tract (SLF I, II and III) are thought to play an important role in a number of cognitive functions including attention and visuospatial processing. To date, the isolation of the fronto-parietal branches of the SLF has been hampered by limitations of traditional tractography approaches. Constrained spherical deconvolution (CSD)-based tractography is an advanced approach that allows valid isolation of the fronto-parietal branches of the SLF. Diffusion MRI data were acquired from 45 participants with ASD and 45 age- and IQ-matched controls. The SLF I, II and III branches were isolated using CSD-based tractography in ExploreDTI. Significantly greater fractional anisotropy (FA) was observed in the right SLF II relative to controls. The ASD group also showed greater linear diffusion coefficient in the left SLF I and the right SLF II. In the SLF II, the ASD group had significantly greater right lateralisation of FA in comparison with the control group. The clinical and functional implications of increased FA in white matter are poorly understood; however, it is possible that this increased white matter organisation in the SLF in ASD may contribute to relative processing advantages in the condition.


Asunto(s)
Trastorno del Espectro Autista/patología , Lóbulo Frontal/patología , Lóbulo Parietal/patología , Sustancia Blanca/patología , Adolescente , Adulto , Anisotropía , Trastorno del Espectro Autista/diagnóstico por imagen , Niño , Imagen de Difusión Tensora , Femenino , Lóbulo Frontal/diagnóstico por imagen , Humanos , Masculino , Lóbulo Parietal/diagnóstico por imagen , Sustancia Blanca/diagnóstico por imagen , Adulto Joven
18.
Brain ; 140(1): 235-246, 2017 01.
Artículo en Inglés | MEDLINE | ID: mdl-28031223

RESUMEN

Social deficits are a core symptom of autism spectrum disorder; however, the perturbed neural mechanisms underpinning these deficits remain unclear. It has been suggested that social prediction errors-coding discrepancies between the predicted and actual outcome of another's decisions-might play a crucial role in processing social information. While the gyral surface of the anterior cingulate cortex signalled social prediction errors in typically developing individuals, this crucial social signal was altered in individuals with autism spectrum disorder. Importantly, the degree to which social prediction error signalling was aberrant correlated with diagnostic measures of social deficits. Effective connectivity analyses further revealed that, in typically developing individuals but not in autism spectrum disorder, the magnitude of social prediction errors was driven by input from the ventromedial prefrontal cortex. These data provide a novel insight into the neural substrates underlying autism spectrum disorder social symptom severity, and further research into the gyral surface of the anterior cingulate cortex and ventromedial prefrontal cortex could provide more targeted therapies to help ameliorate social deficits in autism spectrum disorder.


Asunto(s)
Anticipación Psicológica/fisiología , Trastorno del Espectro Autista/fisiopatología , Giro del Cíngulo/fisiopatología , Corteza Prefrontal/fisiopatología , Índice de Severidad de la Enfermedad , Percepción Social , Adolescente , Adulto , Humanos , Masculino , Adulto Joven
19.
BMC Pregnancy Childbirth ; 17(1): 373, 2017 Nov 13.
Artículo en Inglés | MEDLINE | ID: mdl-29132414

RESUMEN

BACKGROUND: Controversy exists regarding ankyloglossia (tongue-tie) and its clinical impact on breastfeeding, including the benefits, or otherwise, of tongue-tie release (frenotomy). As exclusive breastfeeding rates in Ireland are already considerably low (46% on discharge home from the maternity unit following birth in 2014), it is imperative to protect and support breastfeeding, including identifying the associated effects that frenotomy might have on breastfeeding variables. OBJECTIVE: To determine the associated effects of frenotomy on breastfeeding variables in infants with ankyloglossia. METHODS: A prospective before and after cohort study was conducted. Following ethical approval, two self-reported questionnaires were administered to women whose infants were undergoing frenotomy at seven healthcare clinics in the Republic of Ireland. Data on breastfeeding variables prior to the frenotomy procedure and at 1-month post-frenotomy were collected and compared. Descriptive statistics (frequencies and proportions) were used to analyse, separately, the pre- and post-frenotomy data. Inferential statistics (z-test scores for differences between proportions (alpha <0.05) and mean differences (MD) with 95% confidence intervals (CI)) were used for pre- and post-frenotomy comparative analyses. RESULTS: Ninety-eight women returned the baseline questionnaire, and, of these, 89 returned the follow-up questionnaire. The most common reason for seeking a frenotomy was difficulty with latch (38%). Private lactation consultants were the main person recommending a frenotomy (31%). Rates of exclusive breastfeeding remained similar pre- and post-frenotomy (58% versus 58%), although rates of formula feeding increased two-fold at follow-up. Infants' ability to extend their tongues to the lower lip after frenotomy was significantly increased (p < 0.0001). Almost all participants (91%) reported an overall improvement in breastfeeding post-frenotomy. Pain on breastfeeding was significantly reduced post-frenotomy (MD 2.90, 95% CI 3.75 to 2.05) and overall LATCH scale scores were significantly increased (MD -0.50, 95% CI -0.67 to -0.33). CONCLUSIONS: This study supports the hypothesis that frenotomy has a positive effect on breastfeeding variables in infants with ankyloglossia. These findings, however, are based on a relatively small number of participants from one country only where breastfeeding rates are low. Further, larger studies are required to substantiate these findings.


Asunto(s)
Anquiloglosia/cirugía , Lactancia Materna/estadística & datos numéricos , Frenillo Lingual/cirugía , Femenino , Humanos , Lactante , Recién Nacido , Irlanda , Embarazo , Estudios Prospectivos , Resultado del Tratamiento
20.
J Pediatr ; 177S: S87-S106, 2016 10.
Artículo en Inglés | MEDLINE | ID: mdl-27666279

RESUMEN

The Irish health care system is based on a complex and costly mix of private, statutory, and voluntary provisions. The majority of health care expenditure comes from the state, with a significant proportion of acute hospital care funded from private insurance, but there are relatively high out-of-pocket costs for most service users. There is free access to acute hospital care, but not for primary care, for all children. About 40% of the population have free access to primary care. Universal preventive public health services, including vaccination and immunization, newborn blood spot screening, and universal neonatal hearing screening are free. Major health challenges include poverty, obesity, drug and alcohol use, and mental health. The health care system has been dominated for the last 5 years by the impact of the current recession, which has led to very sharp cuts in health care expenditure. It is unclear if the necessary substantial reform of the system will happen. Government policy calls for a move toward a patient-centered, primary care-led system, but without very substantial transfers of resources and investment in Information and Communication Technology, this is unlikely to occur.


Asunto(s)
Servicios de Salud del Niño , Salud Infantil , Niño , Preescolar , Humanos , Irlanda
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