Pubmed du 23/07/20

jeudi 23 juillet 2020

1. Alfuraydan M, Croxall J, Hurt L, Kerr M, Brophy S. Use of telehealth for facilitating the diagnostic assessment of Autism Spectrum Disorder (ASD) : A scoping review. PLoS One ;2020 ;15(7):e0236415.

There is a significant delay between seeking help and a confirmed diagnosis of Autism Spectrum Disorder (ASD). This delay can lead to poor outcomes for both the families and individuals. Telehealth potentially offers a way of improving the diagnostic pathway for ASD. We conducted a scoping review examining which telehealth approaches are used in the diagnosis and assessment of ASD in children and adults, whether they are feasible and acceptable, and how they compare with face-to-face diagnosis and assessment methods. A search for all peer-reviewed articles, combining the terms of autism and telehealth was conducted from 2000 to 2019. A total of 10 studies were identified for inclusion in the review. This review of the literature found there to be two methods of using telehealth : (a) Real-Time method e.g. video conferencing that enables teams in different areas to consult with the families and to assess the child/adult in real time and (b) A Store-and-Forward method as Naturalistic Observation Diagnostic Assessment (NODA) system to upload videos of child’s behaviors to a webportal that enables the clinicians to make an assessment remotely. The findings were positive, finding there to be high agreement in terms of the diagnosis between remote methods and face to face methods and with high levels of satisfaction among the families and clinicians. This field is in the very early stages and so only studies with small sample size using surveys and interviews were identified but the findings suggest that there is potential for telehealth methods to improve access to assessment and diagnosis of ASD used in conjunction with existing methods, especially for those with clear autism traits and adults with ASD. Larger randomised controlled trials of this technology are warranted.

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2. Bitsika V, Heyne DA, Sharpley CF. Is Bullying Associated with Emerging School Refusal in Autistic Boys ?. J Autism Dev Disord ;2020 (Jul 23)

The experience of being bullied is widespread among autistic youth. Relatively little empirical work has been done on the relationship between the bullying of these youth and school refusal (SR). This study of 67 school-age autistic boys (M = 11.7 years, SD = 2.3 years) examined several factors that may contribute to SR. Data regarding boys’ age, generalised anxiety disorder (GAD), major depressive disorder (MDD), key ASD diagnostic criteria, and frequency of being bullied were collected. Results indicated that, while boys displaying emerging SR also had significantly higher GAD and MDD than boys without emerging SR, only the frequency of being bullied made a significant contribution to emerging SR. Implications for prevention and treatment of SR among autistic youth are discussed.

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3. Clements CC, Sparding T, Schultz RT, Yerys BE, Watkins MW. DAS-II Cognitive Profiles Are Not Diagnostically Meaningful For Autism : A ROC Analysis. Autism Res ;2020 (Jul 21)

Intelligence assessment is an integral part of a comprehensive autism evaluation. Many past studies have described a cognitive profile of autistic individuals characterized by higher nonverbal than verbal IQ scores. The diagnostic utility of this profile, however, remains unknown. We leveraged receiver operating characteristic methods to determine the sensitivity, specificity, and area under the curve (AUC) of three different IQ profiles in a large sample of children who have an autism spectrum disorder diagnosis (N = 1,228, Simons Simplex Collection) who completed the Differential Ability Scales-Second Edition (DAS-II), School Age compared to the normative sample provided by the DAS-II publisher (N = 2,200). The frequently discussed nonverbal > verbal IQ profile performed near chance at distinguishing ASD from normative individuals (AUC : 0.54, 95% CI [0.52-0.56]), and performed significantly worse for females than males (AUC : females : 0.46 [0.41-0.52] ; males : 0.55 [0.53-0.58]). All cognitive profiles showed AUC < 0.56. We conclude that while significant differences between verbal and nonverbal IQ scores exist at the group level, these differences are small in an absolute sense and not meaningful at an individual level. We do not recommend using cognitive profiles to aid in autism diagnostic decision-making. LAY SUMMARY : Some researchers and clinicians have reported an "autistic cognitive profile" of higher nonverbal intelligence than verbal intelligence. In an analysis of over 1,000 autistic children, we found that the group’s average nonverbal intelligence is usually higher than their verbal intelligence. However, this pattern should not be used by clinicians to make an individual diagnosis of autism because our results show it is not helpful nor accurate.

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4. Coburn KL, Williams DL. Development of Neural Structure and Function in Autism Spectrum Disorder : Potential Implications for Learning Language. Am J Speech Lang Pathol ;2020 (Jul 22):1-15.

Purpose Neurodevelopmental processes that begin during gestation and continue throughout childhood typically support language development. Understanding these processes can help us to understand the disruptions to language that occur in neurodevelopmental conditions, such as autism spectrum disorder (ASD). Method For this tutorial, we conducted a focused literature review on typical postnatal brain development and structural and functional magnetic resonance imaging, diffusion tensor imaging, magnetoencephalography, and electroencephalography studies of the neurodevelopmental differences that occur in ASD. We then integrated this knowledge with the literature on evidence-based speech-language intervention practices for autistic children. Results In ASD, structural differences include altered patterns of cortical growth and myelination. Functional differences occur at all brain levels, from lateralization of cortical functions to the rhythmic activations of single neurons. Neuronal oscillations, in particular, could help explain disrupted language development by elucidating the timing differences that contribute to altered functional connectivity, complex information processing, and speech parsing. Findings related to implicit statistical learning, explicit task learning, multisensory integration, and reinforcement in ASD are also discussed. Conclusions Consideration of the neural differences in autistic children provides additional scientific support for current recommended language intervention practices. Recommendations consistent with these neurological findings include the use of short, simple utterances ; repetition of syntactic structures using varied vocabulary ; pause time ; visual supports ; and individualized sensory modifications.

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5. Gaffrey MS, Markert S, Yu C. Social origins of self-regulated attention during infancy and their disruption in autism spectrum disorder : Implications for early intervention. Dev Psychopathol ;2020 (Jul 22):1-13.

To understand the complex relationships between autism spectrum disorder (ASD) and other frequently comorbid conditions, a growing number of studies have investigated the emergence of ASD during infancy. This research has suggested that symptoms of ASD and highly related comorbid conditions emerge from complex interactions between neurodevelopmental vulnerabilities and early environments, indicating that developing treatments to prevent ASD is highly challenging. However, it also suggests that attenuating the negative effects of ASD on future development once identified is possible. The present paper builds on this by conceptualizing developmental delays in nonsocial skills as the potential product of altered caregiver-infant interactions following the emergence of ASD during infancy. And, following emerging findings from caregiver-infant dyadic head-mounted eye-tracking (D-ET) research, it also suggests that a multiple pathway model of joint attention can provide mechanistic insights into how ASD alters the ability of caregiver and infant to create a context for infant learning. The potential for this view to inform early intervention is further discussed and illustrated through D-ET data collected prior to and following a brief, parent-mediated intervention for infant ASD. While promising, further research informing how a multiple pathway model of joint attention can inform ASD early intervention is needed.

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6. Gazy I, Miller CJ, Kim GY, Usdin K. CGG Repeat Expansion, and Elevated Fmr1 Transcription and Mitochondrial Copy Number in a New Fragile X PM Mouse Embryonic Stem Cell Model. Front Cell Dev Biol ;2020 ;8:482.

The Fragile-X related disorders (FXDs) are Repeat Expansion Diseases (REDs) that result from expansion of a CGG-repeat tract located at the 5’ end of the FMR1 gene. While expansion affects transmission risk and can also affect disease risk and severity, the underlying molecular mechanism responsible is unknown. Despite the fact that expanded alleles can be seen both in humans and mouse models in vivo, existing patient-derived cells do not show significant repeat expansions even after extended periods in culture. In order to develop a good tissue culture model for studying expansions we tested whether mouse embryonic stem cells (mESCs) carrying an expanded CGG repeat tract in the endogenous Fmr1 gene are permissive for expansion. We show here that these mESCs have a very high frequency of expansion that allows changes in the repeat number to be seen within a matter of days. CRISPR-Cas9 gene editing of these cells suggests that this may be due in part to the fact that non-homologous end-joining (NHEJ), which is able to protect against expansions in some cell types, is not effective in mESCs. CRISPR-Cas9 gene editing also shows that these expansions are MSH2-dependent, consistent with those seen in vivo. While comparable human Genome Wide Association (GWA) studies are not available for the FXDs, such studies have implicated MSH2 in expansion in other REDs. The shared unusual requirement for MSH2 for this type of microsatellite instability suggests that this new cell-based system is relevant for understanding the mechanism responsible for this peculiar type of mutation in humans. The high frequency of expansions and the ease of gene editing these cells should expedite the identification of factors that affect expansion risk. Additionally, we found that, as with cells from human premutation (PM) carriers, these cell lines have elevated mitochondrial copy numbers and Fmr1 hyperexpression, that we show here is O(2)-sensitive. Thus, this new stem cell model should facilitate studies of both repeat expansion and the consequences of expansion during early embryonic development.

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7. Griffin JW, Scherf KS. Does decreased visual attention to faces underlie difficulties interpreting eye gaze cues in autism ?. Mol Autism ;2020 (Jul 21) ;11(1):60.

BACKGROUND : Shifts in eye gaze communicate social information that allows people to respond to another’s behavior, interpret motivations driving behavior, and anticipate subsequent behavior. Understanding the social communicative nature of gaze shifts requires the ability to link eye movements and mental state information about objects in the world. Autism spectrum disorder (ASD) is characterized by atypical sensitivity to eye gaze cues, which impacts social communication and relationships. We evaluated whether reduced visual attention to faces explains this difficulty in ASD. METHODS : We employed eye-tracking technology to measure visual attention to faces and gazed-at objects in a 4-alternative forced choice paradigm in adolescents with ASD and typically developing (TD) adolescents. Participants determined the target object that an actor was looking at in ecologically rich scenes. We controlled for group differences in task engagement and data quality. RESULTS : In the Gaze Following task, adolescents with ASD were relatively impaired (Cohen’s d = 0.63) in the ability to identify the target object. In contrast to predictions, both groups exhibited comparable fixation durations to faces and target objects. Among both groups, individuals who looked longer at the target objects, but not faces, performed better in the task. Finally, among the ASD group, parent SSIS-Social Skills ratings were positively associated with performance on the Gaze Following task. In the Gaze Perception task, there was a similar pattern of results, which provides internal replication of the findings that visual attention to faces is not related to difficulty interpreting eye gaze cues. Together, these findings indicate that adolescents with ASD are capable of following gaze, but have difficulty linking gaze shifts with mental state information. LIMITATIONS : Additional work is necessary to determine whether these findings generalize to individuals across the full autism spectrum. New paradigms that manipulate component processes of eye gaze processing need to be tested to confirm these interpretations. CONCLUSIONS : Reduced visual attention to faces does not appear to contribute to atypical processing of eye gaze cues among adolescents with ASD. Instead, the difficulty for individuals with ASD is related to understanding the social communicative aspects of eye gaze information, which may not be extracted from visual cues alone.

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8. Hudry K, Chetcuti L, Hocking DR. Motor functioning in developmental psychopathology : A review of autism as an example context. Res Dev Disabil ;2020 (Jul 23) ;105:103739.

BACKGROUND : Motor development research has seen substantial recent growth. However, much remains to be understood about the nature and extent of motor impairments in neurodevelopmental disorders, including their potential as early markers and/or causal determinants of downstream functioning in other domains. AIMS AND METHODS : In this narrative review, drawing primarily on the autism literature by way of example, we review current accounts of the nature and consequences of motor functioning. We consider conventional approaches to measurement and study design, and current limited approaches to tackling heterogeneity. CONCLUSIONS AND IMPLICATIONS : We argue that ongoing adherence to traditional diagnostic outcome classification stands in the face of mounting evidence that characteristics of neurodevelopmental disorders lie on a continuum with variability in the general population, and that three broad research avenues stand to offer a better understanding of motor functioning : The use of technology and advanced statistical methods for a more nuanced understanding of motor abilities ; exploiting the prospective longitudinal tracking of at-risk infants to understand developmental consequences of early motor difference ; and employing randomized controlled trials to test the utility of motor therapies whilst also testing causal hypotheses about the role of motor functioning.

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9. Lindly OJ, Chan J, Fenning RM, Farmer JG, Neumeyer AM, Wang P, Swanson M, Parker RA, Kuhlthau KA. Vision care among school-aged children with autism spectrum disorder in North America : Findings from the Autism Treatment Network Registry Call-Back Study. Autism ;2020 (Jul 21):1362361320942091.

Children with autism are at high risk for vision problems, which may compound core social and behavioral symptoms if untreated. Despite recommendations for school-aged children with autism to receive routine vision testing by an eye care practitioner (ophthalmologist or optometrist), little is known about their vision care. This study, therefore, examined vision care among 351 children with autism ages 6-17 years in the United States or Canada who were enrolled in the Autism Treatment Network Registry. Parents were surveyed using the following vision care measures : (1) child’s vision was tested with pictures, shapes, or letters in the past 2 years ; (2) child’s vision was tested by an eye care practitioner in the past 2 years ; (3) child was prescribed corrective eyeglasses ; and (4) child wore eyeglasses as recommended. Sociodemographic characteristics such as parent education level, child functioning characteristics such as child communication abilities, and family functioning characteristics such as caregiver strain were also assessed in relationship to vision care. Although 78% of children with autism had their vision tested, only 57% had an eye care practitioner test their vision in the past 2 years. Among the 30% of children with autism prescribed corrective eyeglasses, 78% wore their eyeglasses as recommended. Differences in vision care were additionally found among children with autism by parent education, household income, communication abilities, intellectual functioning, and caregiver strain. Overall, study results suggest many school-aged children with autism do not receive recommended vision care and highlight potentially modifiable disparities in vision care.

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10. Lopata C, Thomeer ML, Rodgers JD, Donnelly JP, Booth AJ. RCT of a Comprehensive Outpatient Treatment for Children with Autism Spectrum Disorder. J Clin Child Adolesc Psychol ;2020 (Jul 22):1-15.

OBJECTIVE : This study tested the efficacy of an intensive outpatient psychosocial treatment for children with autism spectrum disorder (ASD) without intellectual disability (ID). METHOD : Eighty-eight children (ages 7-12 years) were randomly assigned to the treatment or control (waitlist) condition. The 18-week cognitive-behavioral treatment (two 90-min sessions per week) included small-group instruction and therapeutic activities targeting social/social-communication skills, face-emotion recognition, nonliteral language skills, and interest expansion. A behavioral system was used to increase skills development and reduce ASD symptoms. Efficacy was tested immediately following treatment (posttest), with maintenance assessed 4-6 weeks later (follow-up). Measures included parent ratings of the children’s social/social-communication skills, ASD symptoms, broad social skills, and behavior symptoms, child tests of social-cognitive skills (emotion recognition and nonliteral language), and behavioral observations. RESULTS : Significant effects favoring the treatment group were found at posttest on the primary measures of ASD symptoms (Social Responsiveness Scale, Second Edition ; Constantino & Gruber, 2012) and social/social-communication skills (Adapted Skillstreaming Checklist ; Lopata, Thomeer, Volker, Nida & Lee, 2008), and secondary measures of nonliteral language skills, broad social skills, and behavior symptoms (measures of emotion-recognition skills and social behaviors during structured game sessions were non-significant). The significant treatment effects found at posttest were all maintained at follow-up. CONCLUSIONS : The outpatient treatment improved several core areas of functioning for children with ASD without ID. Additional elements may be needed to expand the efficacy of the treatment so that the observed skills/symptom improvements generalize to social interactions during gameplay.

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11. Mitchell EJ, Thomson DM, Openshaw RL, Bristow GC, Dawson N, Pratt JA, Morris BJ. Drug-responsive autism phenotypes in the 16p11.2 deletion mouse model : a central role for gene-environment interactions. Sci Rep ;2020 (Jul 23) ;10(1):12303.

There are no current treatments for autism, despite its high prevalence. Deletions of chromosome 16p11.2 dramatically increase risk for autism, suggesting that mice with an equivalent genetic rearrangement may offer a valuable model for the testing of novel classes of therapeutic drug. 16p11.2 deletion (16p11.2 DEL) mice and wild-type controls were assessed using an ethological approach, with 24 h monitoring of activity and social interaction of groups of mice in a home-cage environment. The ability of the excitation/inhibition modulator N-acetyl cysteine (NAC) and the 5-HT(1B/1D/1F) receptor agonist eletriptan to normalise the behavioural deficits observed was tested. 16p11.2 DEL mice exhibited largely normal behaviours, but, following the stress of an injection, showed hyperlocomotion, reduced sociability, and a strong anxiolytic phenotype. The hyperactivity and reduced sociability, but not the suppressed anxiety, were effectively attenuated by both NAC and eletriptan. The data suggest that 16p11.2 DEL mice show an autism-relevant phenotype that becomes overt after an acute stressor, emphasising the importance of gene-environmental interactions in phenotypic analysis. Further, they add to an emerging view that NAC, or 5-HT(1B/1D/1F) receptor agonist treatment, may be a promising strategy for further investigation as a future treatment.

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12. Moavero R, Kotulska K, Lagae L, Benvenuto A, Emberti Gialloreti L, Weschke B, Riney K, Feucht M, Krsek P, Nabbout R, Jansen AC, Wojdan K, Borkowska J, Sadowski K, Hertzberg C, Van Schooneveld MM, Samueli S, Maulisovà A, Aronica E, Kwiatkowski DJ, Jansen FE, Jozwiak S, Curatolo P. Is autism driven by epilepsy in infants with Tuberous Sclerosis Complex ?. Ann Clin Transl Neurol ;2020 (Jul 23)

OBJECTIVE : To evaluate the relationship between age at seizure onset and neurodevelopmental outcome at age 24 months in infants with TSC, as well as the effect on neurodevelopmental outcome of early versus conventional treatment of epileptic seizures with vigabatrin (80-150 mg/kg/day). METHODS : Infants with TSC, aged ≤4 months and without previous seizures were enrolled in a prospective study and closely followed with monthly video EEG and serial standardized neurodevelopmental testing (Bayley Scales of Infant Development and Autism Diagnostic Observation Schedule). RESULTS : Eighty infants were enrolled. At the age of 24 months testing identified risk of Autism Spectrum Disorder (ASD) in 24/80 children (30.0%), and developmental delay (DD) in 26/80 (32.5%). Children with epilepsy (51/80 ; 63.8%) had a higher risk of ASD (P = 0.02) and DD (P = 0.001). Overall, no child presented with moderate or severe DD at 24 months (developmental quotient < 55). In 20% of children abnormal developmental trajectories were detected before the onset of seizures. Furthermore, 21% of all children with risk of ASD at 24 months had not developed seizures at that timepoint. There was no significant difference between early and conventional treatment with respect to rate of risk of ASD (P = 0.8) or DD (P = 0.9) at 24 months. INTERPRETATION : This study confirms a relationship between epilepsy and risk of ASD/DD. However, in this combined randomized/open label study, early treatment with vigabatrin did not alter the risk of ASD or DD at age 2 years.

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13. Murray SO, Kolodny T, Schallmo MP, Gerdts J, Bernier RA. Late fMRI Response Components Are Altered in Autism Spectrum Disorder. Front Hum Neurosci ;2020 ;14:241.

Disrupted cortical neural inhibition has been hypothesized to be a primary contributor to the pathophysiology of autism spectrum disorder (ASD). This hypothesis predicts that ASD will be associated with an increase in neural responses. We tested this prediction by comparing fMRI response magnitudes to simultaneous visual, auditory, and motor stimulation in ASD and neurotypical (NT) individuals. No increases in the initial transient response in any brain region were observed in ASD, suggesting that there is no increase in overall cortical neural excitability. Most notably, there were widespread fMRI magnitude increases in the ASD response following stimulation offset, approximately 6-8 s after the termination of sensory and motor stimulation. In some regions, the higher fMRI offset response in ASD could be attributed to a lack of an "undershoot"-an often observed feature of fMRI responses believed to reflect inhibitory processing. Offset response magnitude was associated with reaction times (RT) in the NT group and may explain an overall reduced RT in the ASD group. Overall, our results suggest that increases in neural responsiveness are present in ASD but are confined to specific components of the neural response, are particularly strong following stimulation offset, and are linked to differences in RT.

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14. Novelli G, Novelli A, Borgiani P, Cocciadiferro D, Biancolella M, Agolini E, Pietrosanto M, Casalone R, Helmer-Citterich M, Giardina E, Jain SK, Wei W, Eng C, Pandolfi PP. WWP1 germline variants are associated with normocephalic autism spectrum disorder. Cell Death Dis ;2020 (Jul 23) ;11(7):529.

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15. Romani PW, Ariefdjohan M, Jensen Gaffey LL, Torres-Dominguez M, Lister J. Relations between patient and staff member characteristics and staff member injury on a psychiatric inpatient unit for children with intellectual or developmental disabilities. J Child Adolesc Psychiatr Nurs ;2020 (Jul 23)

PROBLEM : Staff member injuries are a pervasive and long-standing problem for psychiatric inpatient units. METHOD : The current study analyzed the prevalence of staff member injury and characteristics of patients that injured staff on a specialized psychiatric unit for children with intellectual or developmental disabilities. We evaluated staffing patterns as well as characteristics of patients (e.g., diagnoses, body mass index) between 2016 and 2018. This time period was selected because it represented an approximately equal period before and after the introduction of a new clinical model that incorporated applied behavior analysis (ABA) and other safety-related practices (e.g., personal protective equipment). FINDINGS : During this study period, there were 110 cases of staff injuries caused by 42 patients. Injuries were most likely to occur during physical management of a patient engaging in aggressive behavior, but less so when strategies requiring less physical contact were implemented. The frequency of staff injury was also significantly related to patients’ diagnoses, particularly those exhibiting aggressive behavior and diagnosed with moderate-to-severe intellectual disability and/or autism spectrum disorder. CONCLUSIONS : Robust staff training incorporating the principles of ABA and the provision of other safety-related resources can be integrated to clinical guidelines to promote the safety of staff practicing in psychiatric inpatient units.

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16. Sasayama D, Kudo T, Kaneko W, Kuge R, Koizumi N, Nomiyama T, Washizuka S, Honda H. Brief Report : Cumulative Incidence of Autism Spectrum Disorder Before School Entry in a Thoroughly Screened Population. J Autism Dev Disord ;2020 (Jul 21)

The present study aimed to identify the cumulative incidence of autism spectrum disorder (ASD) in a thoroughly screened population and to examine the behavioral and motor characteristics observed in children with ASD at the age of 18 months. Subjects were 1067 children who underwent a screening assessment for ASD at the routine 18-months health checkup. By the age of 6 years, 3.1% (4.3% of boys and 2.0% of girls) were diagnosed as having ASD by their attending pediatricians. Higher rate of difficulties in motor skills and social and communication skills had been reported in children with ASD at 18 months of age. This study showed that careful community-based screening system may be helpful in detecting ASD at early age.

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17. Talbott MR, Miller MR. Future Directions for Infant Identification and Intervention for Autism Spectrum Disorder from a Transdiagnostic Perspective. J Clin Child Adolesc Psychol ;2020 (Jul 23):1-15.

By the time they are typically detected, neurodevelopmental disorders like autism spectrum disorder (ASD) are already challenging to treat. Preventive and early intervention strategies in infancy are critical for improving outcomes over the lifespan with significant cost savings. However, the impact of prevention and early intervention efforts is dependent upon our ability to identify infants most appropriate for such interventions. Because there may be significant overlap between prodromal symptoms across neurodevelopmental disorders and child psychopathology more broadly which may wax and wane across development, we contend that the impact of prevention and early intervention efforts will be heightened by identifying early indicators that may overlap across ASD and other commonly co-occurring disorders. This paper summarizes the existing literature on infant symptoms and identification of ASD to demonstrate the ways in which a transdiagnostic perspective could expand the impact of early identification and intervention research and clinical efforts, and to outline suggestions for future empirical research programs addressing current gaps in the identification-to-treatment pipeline. We propose four recommendations for future research that are both grounded in developmental and clinical science and that are scalable for early intervention systems : (1) development of fine-grained, norm-referenced measures of ASD-relevant transdiagnostic behavioral domains ; (2) identification of shared and distinct mechanisms influencing the transition from risk to disorder ; (3) determination of key cross-cutting treatment strategies (both novel and extracted from existing approaches) effective in targeting specific domains across disorders ; and (4) integration of identified measures and treatments into existing service systems.

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18. Tessari L, Angriman M, Díaz-Román A, Zhang J, Conca A, Cortese S. Association Between Exposure to Pesticides and ADHD or Autism Spectrum Disorder : A Systematic Review of the Literature. J Atten Disord ;2020 (Jul 22):1087054720940402.

OBJECTIVE : To conduct a systematic review of studies assessing the relationship between exposure to pesticides and ADHD or Autism Spectrum Disorder (ASD). METHODS : Based on a pre-registered protocol in PROPSERO (CRD42018107847), we searched PubMed, Ovid databases, and ISI Web of Knowledge with no date/language/document type restrictions, up to May 2019. The Newcastle Ottawa Scale was used to assess study quality. RESULTS : Among the 29 retained studies, 13 focused on ADHD, 14 on ASD, and two on both disorders. Ten studies reported a significant association between exposure to pesticides and ADHD/ADHD symptoms and 12 studies found a significant association with ASD/ASD traits. The strengths of the association and the possible confounders controlled for varied substantially across studies. CONCLUSION : Whilst there is some evidence suggesting a possible link between pesticides and ADHD/ASD, heterogeneity across studies prevents firm conclusions. We provide methodological indications for future studies.

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