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Auteur Ritika JAINI |
Documents disponibles écrits par cet auteur (2)
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Cross-level analysis of molecular and neurobehavioral function in a prospective series of patients with germline heterozygous PTEN mutations with and without autism / Thomas W FRAZIER in Molecular Autism, 12 (2021)
[article]
Titre : Cross-level analysis of molecular and neurobehavioral function in a prospective series of patients with germline heterozygous PTEN mutations with and without autism Type de document : Texte imprimé et/ou numérique Auteurs : Thomas W FRAZIER, Auteur ; Ritika JAINI, Auteur ; Robyn M. BUSCH, Auteur ; Matthew WOLF, Auteur ; Tammy SADLER, Auteur ; Patricia KLAAS, Auteur ; Antonio Y. HARDAN, Auteur ; Julian A. MARTINEZ-AGOSTO, Auteur ; Mustafa SAHIN, Auteur ; Chari ENG, Auteur Article en page(s) : 5p. Langues : Anglais (eng) Mots-clés : Autism spectrum disorder Behavior Cognition Molecular Pten Protein Index. décimale : PER Périodiques Résumé : BACKGROUND: PTEN is a well-established risk gene for autism spectrum disorder (ASD). Yet, little is known about how PTEN mutations and associated molecular processes influence neurobehavioral function in mutation carriers with (PTEN-ASD) and without ASD (PTEN no-ASD). The primary aim of the present study was to examine group differences in peripheral blood-derived PTEN pathway protein levels between PTEN-ASD, PTEN no-ASD, and idiopathic macrocephalic ASD patients (macro-ASD). Secondarily, associations between protein levels and neurobehavioral functions were examined in the full cohort. METHODS: Patients were recruited at four tertiary medical centers. Peripheral blood-derived protein levels from canonical PTEN pathways (PI3K/AKT and MAPK/ERK) were analyzed using Western blot analyses blinded to genotype and ASD status. Neurobehavioral measures included standardized assessments of global cognitive ability and multiple neurobehavioral domains. Analysis of variance models examined group differences in demographic, neurobehavioral, and protein measures. Bivariate correlations, structural models, and statistical learning procedures estimated associations between molecular and neurobehavioral variables. To complement patient data, Western blots for downstream proteins were generated to evaluate canonical PTEN pathways in the PTEN-m3m4 mouse model. RESULTS: Participants included 61 patients (25 PTEN-ASD, 16 PTEN no-ASD, and 20 macro-ASD). Decreased PTEN and S6 were observed in both PTEN mutation groups. Reductions in MnSOD and increases in P-S6 were observed in ASD groups. Elevated neural P-AKT/AKT and P-S6/S6 from PTEN murine models parallel our patient observations. Patient PTEN and AKT levels were independently associated with global cognitive ability, and p27 expression was associated with frontal sub-cortical functions. As a group, molecular measures added significant predictive value to several neurobehavioral domains over and above PTEN mutation status. LIMITATIONS: Sample sizes were small, precluding within-group analyses. Protein and neurobehavioral data were limited to a single evaluation. A small number of patients were excluded with invalid protein data, and cognitively impaired patients had missing data on some assessments. CONCLUSIONS: Several canonical PTEN pathway molecules appear to influence the presence of ASD and modify neurobehavioral function in PTEN mutation patients. Protein assays of the PTEN pathway may be useful for predicting neurobehavioral outcomes in PTEN patients. Future longitudinal analyses are needed to replicate these findings and evaluate within-group relationships between protein and neurobehavioral measures. TRIAL REGISTRATION: ClinicalTrials.gov Identifier NCT02461446. En ligne : http://dx.doi.org/10.1186/s13229-020-00406-6 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=442
in Molecular Autism > 12 (2021) . - 5p.[article] Cross-level analysis of molecular and neurobehavioral function in a prospective series of patients with germline heterozygous PTEN mutations with and without autism [Texte imprimé et/ou numérique] / Thomas W FRAZIER, Auteur ; Ritika JAINI, Auteur ; Robyn M. BUSCH, Auteur ; Matthew WOLF, Auteur ; Tammy SADLER, Auteur ; Patricia KLAAS, Auteur ; Antonio Y. HARDAN, Auteur ; Julian A. MARTINEZ-AGOSTO, Auteur ; Mustafa SAHIN, Auteur ; Chari ENG, Auteur . - 5p.
Langues : Anglais (eng)
in Molecular Autism > 12 (2021) . - 5p.
Mots-clés : Autism spectrum disorder Behavior Cognition Molecular Pten Protein Index. décimale : PER Périodiques Résumé : BACKGROUND: PTEN is a well-established risk gene for autism spectrum disorder (ASD). Yet, little is known about how PTEN mutations and associated molecular processes influence neurobehavioral function in mutation carriers with (PTEN-ASD) and without ASD (PTEN no-ASD). The primary aim of the present study was to examine group differences in peripheral blood-derived PTEN pathway protein levels between PTEN-ASD, PTEN no-ASD, and idiopathic macrocephalic ASD patients (macro-ASD). Secondarily, associations between protein levels and neurobehavioral functions were examined in the full cohort. METHODS: Patients were recruited at four tertiary medical centers. Peripheral blood-derived protein levels from canonical PTEN pathways (PI3K/AKT and MAPK/ERK) were analyzed using Western blot analyses blinded to genotype and ASD status. Neurobehavioral measures included standardized assessments of global cognitive ability and multiple neurobehavioral domains. Analysis of variance models examined group differences in demographic, neurobehavioral, and protein measures. Bivariate correlations, structural models, and statistical learning procedures estimated associations between molecular and neurobehavioral variables. To complement patient data, Western blots for downstream proteins were generated to evaluate canonical PTEN pathways in the PTEN-m3m4 mouse model. RESULTS: Participants included 61 patients (25 PTEN-ASD, 16 PTEN no-ASD, and 20 macro-ASD). Decreased PTEN and S6 were observed in both PTEN mutation groups. Reductions in MnSOD and increases in P-S6 were observed in ASD groups. Elevated neural P-AKT/AKT and P-S6/S6 from PTEN murine models parallel our patient observations. Patient PTEN and AKT levels were independently associated with global cognitive ability, and p27 expression was associated with frontal sub-cortical functions. As a group, molecular measures added significant predictive value to several neurobehavioral domains over and above PTEN mutation status. LIMITATIONS: Sample sizes were small, precluding within-group analyses. Protein and neurobehavioral data were limited to a single evaluation. A small number of patients were excluded with invalid protein data, and cognitively impaired patients had missing data on some assessments. CONCLUSIONS: Several canonical PTEN pathway molecules appear to influence the presence of ASD and modify neurobehavioral function in PTEN mutation patients. Protein assays of the PTEN pathway may be useful for predicting neurobehavioral outcomes in PTEN patients. Future longitudinal analyses are needed to replicate these findings and evaluate within-group relationships between protein and neurobehavioral measures. TRIAL REGISTRATION: ClinicalTrials.gov Identifier NCT02461446. En ligne : http://dx.doi.org/10.1186/s13229-020-00406-6 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=442 Decreased nuclear Pten in neural stem cells contributes to deficits in neuronal maturation / Shin Chung KANG in Molecular Autism, 11 (2020)
[article]
Titre : Decreased nuclear Pten in neural stem cells contributes to deficits in neuronal maturation Type de document : Texte imprimé et/ou numérique Auteurs : Shin Chung KANG, Auteur ; Ritika JAINI, Auteur ; Masahiro HITOMI, Auteur ; Hyunpil LEE, Auteur ; Nick SARN, Auteur ; Stetson THACKER, Auteur ; Charis ENG, Auteur Article en page(s) : 43 p. Langues : Anglais (eng) Mots-clés : Autism spectrum disorder Creb activation Neural development Neural stem cells Neuronal maturation PTEN mutation Index. décimale : PER Périodiques Résumé : BACKGROUND: PTEN, a syndromic autism spectrum disorder (ASD) risk gene, is mutated in approximately 10% of macrocephalic ASD cases. Despite the described genetic association between PTEN and ASD and ensuing studies, we continue to have a limited understanding of how PTEN disruption drives ASD pathogenesis and maintenance. METHODS: We derived neural stem cells (NSCs) from the dentate gyrus (DG) of Pten(m3m4) mice, a model that recapitulates PTEN-ASD phenotypes. We subsequently characterized the expression of stemness factors, proliferation, and differentiation of neurons and glia in Pten(m3m4) NSCs using immunofluorescent and immunoblotting approaches. We also measured Creb phosphorylation by Western blot analysis and expression of Creb-regulated genes with qRT-PCR. RESULTS: The m3m4 mutation decreases Pten localization to the nucleus and its global expression over time. Pten(m3m4) NSCs exhibit persistent stemness characteristics associated with increased proliferation and a resistance to neuronal maturation during differentiation. Given the increased proliferation of Pten(m3m4) NSCs, a significant increase in the population of immature neurons relative to mature neurons occurs, an approximately tenfold decrease in the ratio between the homozygous mutant and wildtype. There is an opposite pattern of differentiation in some Pten(m3m4) glia, specifically an increase in astrocytes. These aberrant differentiation patterns associate with changes in Creb activation in Pten(m3m4/m3m4) NSCs. We specifically observed loss of Creb phosphorylation at S133 in Pten(m3m4/m3m4) NSCs and a subsequent decrease in expression of Creb-regulated genes important to neuronal function (i.e., Bdnf). Interestingly, Bdnf treatment is able to partially rescue the stunted neuronal maturation phenotype in Pten(m3m4/m3m4) NSCs. CONCLUSIONS: Constitutional disruption of Pten nuclear localization with subsequent global decrease in Pten expression generates abnormal patterns of differentiation, a stunting of neuronal maturation. The propensity of Pten disruption to restrain neurons to a more progenitor-like state may be an important feature contributing to PTEN-ASD pathogenesis. En ligne : http://dx.doi.org/10.1186/s13229-020-00337-2 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=427
in Molecular Autism > 11 (2020) . - 43 p.[article] Decreased nuclear Pten in neural stem cells contributes to deficits in neuronal maturation [Texte imprimé et/ou numérique] / Shin Chung KANG, Auteur ; Ritika JAINI, Auteur ; Masahiro HITOMI, Auteur ; Hyunpil LEE, Auteur ; Nick SARN, Auteur ; Stetson THACKER, Auteur ; Charis ENG, Auteur . - 43 p.
Langues : Anglais (eng)
in Molecular Autism > 11 (2020) . - 43 p.
Mots-clés : Autism spectrum disorder Creb activation Neural development Neural stem cells Neuronal maturation PTEN mutation Index. décimale : PER Périodiques Résumé : BACKGROUND: PTEN, a syndromic autism spectrum disorder (ASD) risk gene, is mutated in approximately 10% of macrocephalic ASD cases. Despite the described genetic association between PTEN and ASD and ensuing studies, we continue to have a limited understanding of how PTEN disruption drives ASD pathogenesis and maintenance. METHODS: We derived neural stem cells (NSCs) from the dentate gyrus (DG) of Pten(m3m4) mice, a model that recapitulates PTEN-ASD phenotypes. We subsequently characterized the expression of stemness factors, proliferation, and differentiation of neurons and glia in Pten(m3m4) NSCs using immunofluorescent and immunoblotting approaches. We also measured Creb phosphorylation by Western blot analysis and expression of Creb-regulated genes with qRT-PCR. RESULTS: The m3m4 mutation decreases Pten localization to the nucleus and its global expression over time. Pten(m3m4) NSCs exhibit persistent stemness characteristics associated with increased proliferation and a resistance to neuronal maturation during differentiation. Given the increased proliferation of Pten(m3m4) NSCs, a significant increase in the population of immature neurons relative to mature neurons occurs, an approximately tenfold decrease in the ratio between the homozygous mutant and wildtype. There is an opposite pattern of differentiation in some Pten(m3m4) glia, specifically an increase in astrocytes. These aberrant differentiation patterns associate with changes in Creb activation in Pten(m3m4/m3m4) NSCs. We specifically observed loss of Creb phosphorylation at S133 in Pten(m3m4/m3m4) NSCs and a subsequent decrease in expression of Creb-regulated genes important to neuronal function (i.e., Bdnf). Interestingly, Bdnf treatment is able to partially rescue the stunted neuronal maturation phenotype in Pten(m3m4/m3m4) NSCs. CONCLUSIONS: Constitutional disruption of Pten nuclear localization with subsequent global decrease in Pten expression generates abnormal patterns of differentiation, a stunting of neuronal maturation. The propensity of Pten disruption to restrain neurons to a more progenitor-like state may be an important feature contributing to PTEN-ASD pathogenesis. En ligne : http://dx.doi.org/10.1186/s13229-020-00337-2 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=427