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Auteur G. M. MCALONAN |
Documents disponibles écrits par cet auteur (2)
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Familial risk of autism alters subcortical and cerebellar brain anatomy in infants and predicts the emergence of repetitive behaviors in early childhood / I. POTE in Autism Research, 12-4 (April 2019)
[article]
Titre : Familial risk of autism alters subcortical and cerebellar brain anatomy in infants and predicts the emergence of repetitive behaviors in early childhood Type de document : Texte imprimé et/ou numérique Auteurs : I. POTE, Auteur ; S. WANG, Auteur ; V. SETHNA, Auteur ; A. BLASI, Auteur ; Eileen DALY, Auteur ; M. KUKLISOVA-MURGASOVA, Auteur ; S. LLOYD-FOX, Auteur ; E. MERCURE, Auteur ; P. BUSUULWA, Auteur ; V. STOENCHEVA, Auteur ; Tony CHARMAN, Auteur ; S. C. R. WILLIAMS, Auteur ; M. H. JOHNSON, Auteur ; D. G. M. MURPHY, Auteur ; G. M. MCALONAN, Auteur Article en page(s) : p.614-627 Langues : Anglais (eng) Mots-clés : autism spectrum disorder cerebellum familial risk infants magnetic resonance imaging-structural mother-infant interaction subcortex Index. décimale : PER Périodiques Résumé : Autism spectrum disorder (ASD) is a common neurodevelopmental condition, and infant siblings of children with ASD are at a higher risk of developing autistic traits or an ASD diagnosis, when compared to those with typically developing siblings. Reports of differences in brain anatomy and function in high-risk infants which predict later autistic behaviors are emerging, but although cerebellar and subcortical brain regions have been frequently implicated in ASD, no high-risk study has examined these regions. Therefore, in this study, we compared regional MRI volumes across the whole brain in 4-6-month-old infants with (high-risk, n = 24) and without (low-risk, n = 26) a sibling with ASD. Within the high-risk group, we also examined whether any regional differences observed were associated with autistic behaviors at 36 months. We found that high-risk infants had significantly larger cerebellar and subcortical volumes at 4-6-months of age, relative to low-risk infants; and that larger volumes in high-risk infants were linked to more repetitive behaviors at 36 months. Our preliminary observations require replication in longitudinal studies of larger samples. If correct, they suggest that the early subcortex and cerebellum volumes may be predictive biomarkers for childhood repetitive behaviors. Autism Res 2019, 12: 614-627. (c) 2019 The Authors. Autism Research published by International Society for Autism Research published byWiley Periodicals, Inc. LAY SUMMARY: Individuals with a family history of autism spectrum disorder (ASD) are at risk of ASD and related developmental difficulties. This study revealed that 4-6-month-old infants at high-risk of ASD have larger cerebellum and subcortical volumes than low-risk infants, and that larger volumes in high-risk infants are associated with more repetitive behaviors in childhood. En ligne : https://dx.doi.org/10.1002/aur.2083 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=388
in Autism Research > 12-4 (April 2019) . - p.614-627[article] Familial risk of autism alters subcortical and cerebellar brain anatomy in infants and predicts the emergence of repetitive behaviors in early childhood [Texte imprimé et/ou numérique] / I. POTE, Auteur ; S. WANG, Auteur ; V. SETHNA, Auteur ; A. BLASI, Auteur ; Eileen DALY, Auteur ; M. KUKLISOVA-MURGASOVA, Auteur ; S. LLOYD-FOX, Auteur ; E. MERCURE, Auteur ; P. BUSUULWA, Auteur ; V. STOENCHEVA, Auteur ; Tony CHARMAN, Auteur ; S. C. R. WILLIAMS, Auteur ; M. H. JOHNSON, Auteur ; D. G. M. MURPHY, Auteur ; G. M. MCALONAN, Auteur . - p.614-627.
Langues : Anglais (eng)
in Autism Research > 12-4 (April 2019) . - p.614-627
Mots-clés : autism spectrum disorder cerebellum familial risk infants magnetic resonance imaging-structural mother-infant interaction subcortex Index. décimale : PER Périodiques Résumé : Autism spectrum disorder (ASD) is a common neurodevelopmental condition, and infant siblings of children with ASD are at a higher risk of developing autistic traits or an ASD diagnosis, when compared to those with typically developing siblings. Reports of differences in brain anatomy and function in high-risk infants which predict later autistic behaviors are emerging, but although cerebellar and subcortical brain regions have been frequently implicated in ASD, no high-risk study has examined these regions. Therefore, in this study, we compared regional MRI volumes across the whole brain in 4-6-month-old infants with (high-risk, n = 24) and without (low-risk, n = 26) a sibling with ASD. Within the high-risk group, we also examined whether any regional differences observed were associated with autistic behaviors at 36 months. We found that high-risk infants had significantly larger cerebellar and subcortical volumes at 4-6-months of age, relative to low-risk infants; and that larger volumes in high-risk infants were linked to more repetitive behaviors at 36 months. Our preliminary observations require replication in longitudinal studies of larger samples. If correct, they suggest that the early subcortex and cerebellum volumes may be predictive biomarkers for childhood repetitive behaviors. Autism Res 2019, 12: 614-627. (c) 2019 The Authors. Autism Research published by International Society for Autism Research published byWiley Periodicals, Inc. LAY SUMMARY: Individuals with a family history of autism spectrum disorder (ASD) are at risk of ASD and related developmental difficulties. This study revealed that 4-6-month-old infants at high-risk of ASD have larger cerebellum and subcortical volumes than low-risk infants, and that larger volumes in high-risk infants are associated with more repetitive behaviors in childhood. En ligne : https://dx.doi.org/10.1002/aur.2083 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=388 Modulation of striatal functional connectivity differences in adults with and without autism spectrum disorder in a single-dose randomized trial of cannabidivarin / C. M. PRETZSCH in Molecular Autism, 12 (2021)
[article]
Titre : Modulation of striatal functional connectivity differences in adults with and without autism spectrum disorder in a single-dose randomized trial of cannabidivarin Type de document : Texte imprimé et/ou numérique Auteurs : C. M. PRETZSCH, Auteur ; D. L. FLORIS, Auteur ; B. VOINESCU, Auteur ; M. ELSAHIB, Auteur ; M. A. MENDEZ, Auteur ; R. WICHERS, Auteur ; L. AJRAM, Auteur ; G. IVIN, Auteur ; M. HEASMAN, Auteur ; E. PRETZSCH, Auteur ; S. WILLIAMS, Auteur ; D. G. M. MURPHY, Auteur ; Eileen DALY, Auteur ; G. M. MCALONAN, Auteur Article en page(s) : 49 p. Langues : Anglais (eng) Mots-clés : Autism spectrum condition Autism spectrum disorder Cbdv Cannabidivarin Functional connectivity Striatum Index. décimale : PER Périodiques Résumé : BACKGROUND: Autism spectrum disorder (ASD) has a high cost to affected individuals and society, but treatments for core symptoms are lacking. To expand intervention options, it is crucial to gain a better understanding of potential treatment targets, and their engagement, in the brain. For instance, the striatum (caudate, putamen, and nucleus accumbens) plays a central role during development and its (atypical) functional connectivity (FC) may contribute to multiple ASD symptoms. We have previously shown, in the adult autistic and neurotypical brain, the non-intoxicating cannabinoid cannabidivarin (CBDV) alters the balance of striatal 'excitatory-inhibitory' metabolites, which help regulate FC, but the effects of CBDV on (atypical) striatal FC are unknown. METHODS: To examine this in a small pilot study, we acquired resting state functional magnetic resonance imaging data from 28 men (15 neurotypicals, 13 ASD) on two occasions in a repeated-measures, double-blind, placebo-controlled study. We then used a seed-based approach to (1) compare striatal FC between groups and (2) examine the effect of pharmacological probing (600 mg CBDV/matched placebo) on atypical striatal FC in ASD. Visits were separated by at least 13 days to allow for drug washout. RESULTS: Compared to the neurotypicals, ASD individuals had lower FC between the ventral striatum and frontal and pericentral regions (which have been associated with emotion, motor, and vision processing). Further, they had higher intra-striatal FC and higher putamenal FC with temporal regions involved in speech and language. In ASD, CBDV reduced hyperconnectivity to the neurotypical level. LIMITATIONS: Our findings should be considered in light of several methodological aspects, in particular our participant group (restricted to male adults), which limits the generalizability of our findings to the wider and heterogeneous ASD population. CONCLUSION: In conclusion, here we show atypical striatal FC with regions commonly associated with ASD symptoms. We further provide preliminary proof of concept that, in the adult autistic brain, acute CBDV administration can modulate atypical striatal circuitry towards neurotypical function. Future studies are required to determine whether modulation of striatal FC is associated with a change in ASD symptoms. TRIAL REGISTRATION: clinicaltrials.gov, Identifier: NCT03537950. Registered May 25th, 2018-Retrospectively registered, https://clinicaltrials.gov/ct2/show/NCT03537950?term=NCT03537950&draw=2&rank=1 . En ligne : http://dx.doi.org/10.1186/s13229-021-00454-6 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=459
in Molecular Autism > 12 (2021) . - 49 p.[article] Modulation of striatal functional connectivity differences in adults with and without autism spectrum disorder in a single-dose randomized trial of cannabidivarin [Texte imprimé et/ou numérique] / C. M. PRETZSCH, Auteur ; D. L. FLORIS, Auteur ; B. VOINESCU, Auteur ; M. ELSAHIB, Auteur ; M. A. MENDEZ, Auteur ; R. WICHERS, Auteur ; L. AJRAM, Auteur ; G. IVIN, Auteur ; M. HEASMAN, Auteur ; E. PRETZSCH, Auteur ; S. WILLIAMS, Auteur ; D. G. M. MURPHY, Auteur ; Eileen DALY, Auteur ; G. M. MCALONAN, Auteur . - 49 p.
Langues : Anglais (eng)
in Molecular Autism > 12 (2021) . - 49 p.
Mots-clés : Autism spectrum condition Autism spectrum disorder Cbdv Cannabidivarin Functional connectivity Striatum Index. décimale : PER Périodiques Résumé : BACKGROUND: Autism spectrum disorder (ASD) has a high cost to affected individuals and society, but treatments for core symptoms are lacking. To expand intervention options, it is crucial to gain a better understanding of potential treatment targets, and their engagement, in the brain. For instance, the striatum (caudate, putamen, and nucleus accumbens) plays a central role during development and its (atypical) functional connectivity (FC) may contribute to multiple ASD symptoms. We have previously shown, in the adult autistic and neurotypical brain, the non-intoxicating cannabinoid cannabidivarin (CBDV) alters the balance of striatal 'excitatory-inhibitory' metabolites, which help regulate FC, but the effects of CBDV on (atypical) striatal FC are unknown. METHODS: To examine this in a small pilot study, we acquired resting state functional magnetic resonance imaging data from 28 men (15 neurotypicals, 13 ASD) on two occasions in a repeated-measures, double-blind, placebo-controlled study. We then used a seed-based approach to (1) compare striatal FC between groups and (2) examine the effect of pharmacological probing (600 mg CBDV/matched placebo) on atypical striatal FC in ASD. Visits were separated by at least 13 days to allow for drug washout. RESULTS: Compared to the neurotypicals, ASD individuals had lower FC between the ventral striatum and frontal and pericentral regions (which have been associated with emotion, motor, and vision processing). Further, they had higher intra-striatal FC and higher putamenal FC with temporal regions involved in speech and language. In ASD, CBDV reduced hyperconnectivity to the neurotypical level. LIMITATIONS: Our findings should be considered in light of several methodological aspects, in particular our participant group (restricted to male adults), which limits the generalizability of our findings to the wider and heterogeneous ASD population. CONCLUSION: In conclusion, here we show atypical striatal FC with regions commonly associated with ASD symptoms. We further provide preliminary proof of concept that, in the adult autistic brain, acute CBDV administration can modulate atypical striatal circuitry towards neurotypical function. Future studies are required to determine whether modulation of striatal FC is associated with a change in ASD symptoms. TRIAL REGISTRATION: clinicaltrials.gov, Identifier: NCT03537950. Registered May 25th, 2018-Retrospectively registered, https://clinicaltrials.gov/ct2/show/NCT03537950?term=NCT03537950&draw=2&rank=1 . En ligne : http://dx.doi.org/10.1186/s13229-021-00454-6 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=459