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1.
Neurol Sci ; 45(9): 4549-4561, 2024 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-38639894

RESUMO

BACKGROUND: Neurophysiological studies recognized that Autism Spectrum Disorder (ASD) is associated with altered patterns of over- and under-connectivity. However, little is known about network organization in children with ASD in the early phases of development and its correlation with the severity of core autistic features. METHODS: The present study aimed at investigating the association between brain connectivity derived from MEG signals and severity of ASD traits measured with different diagnostic clinical scales, in a sample of 16 children with ASD aged 2 to 6 years. RESULTS: A significant correlation emerged between connectivity strength in cortical brain areas implicated in several resting state networks (Default mode, Central executive, Salience, Visual and Sensorimotor) and the severity of communication anomalies, social interaction problems, social affect problems, and repetitive behaviors. Seed analysis revealed that this pattern of correlation was mainly caused by global rather than local effects. CONCLUSIONS: The present evidence suggests that altered connectivity strength in several resting state networks is related to clinical features and may contribute to neurofunctional correlates of ASD. Future studies implementing the same method on a wider and stratified sample may further support functional connectivity as a possible biomarker of the condition.


Assuntos
Transtorno do Espectro Autista , Encéfalo , Magnetoencefalografia , Humanos , Transtorno do Espectro Autista/fisiopatologia , Transtorno do Espectro Autista/diagnóstico por imagem , Masculino , Pré-Escolar , Feminino , Criança , Encéfalo/fisiopatologia , Encéfalo/diagnóstico por imagem , Descanso/fisiologia , Vias Neurais/fisiopatologia , Vias Neurais/diagnóstico por imagem , Conectoma
2.
Neurol Sci ; 44(11): 4033-4040, 2023 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-37322312

RESUMO

PURPOSE: MRI has an important role in diagnosing pilocytic astrocytoma and post-surgical follow-up since the surgical approach has a leading role in its treatment. The purpose of our study is to provide an overview of the typical and atypical MRI findings in a series of pediatric patients with isolated-not NF1-related-pilocytic astrocytomas and to correlate specific MRI patterns with clinical variables. METHODS: This is a cross-sectional retrospective study providing the analysis of several clinical and neuroradiological findings from a cohort of pediatric pilocytic astrocytoma, starting from the data collected in the Fondazione IRCCS Istituto Neurologico Carlo Besta (FINCB) internal Cancer Registry during an 11-year time period (January 2008-January 2019). RESULTS: Fifty-six patients were included in the study. Median age at diagnosis was 9.4 years; a slight female prevalence was noticed (m/f ratio 44.6%/55.4%). The majority of pPAs had well-defined contours: 51 (91.1%), 47 (88.7%) were hypointense on T1-wi, all of them were hyperintense on T2-wi, 46 (90.2%) were hyperintense on FLAIR, and 48 (85.7%) were heterogeneous on T1-wi and T2-wi sequences. We found positive correlation between pPAs location and age (r = 0.017), and small degree of connection between pPAs location and gender (Cramer's V = 0.268). CONCLUSIONS: We presented typical and atypical pPAs MRI findings. Age and tumor location were positevely correlated, while degree of connection between gender and pPAs location was small. All of this may aid clinicians, most of all neuroradiologists, neurosurgeons, and neurologists in proper diagnoses and follow-up of these specific patient population.

3.
Childs Nerv Syst ; 39(6): 1463-1471, 2023 06.
Artigo em Inglês | MEDLINE | ID: mdl-36520160

RESUMO

INTRODUCTION: Surgical resection represents the mainstay of treatment, in pediatric central nervous system (CNS) tumors, and aggressive resection correlates with prognosis for several histotypes. Sodium fluorescein (SF), a green, water-soluble dye, is used as neurosurgical fluorescent tracer thanks to its property to accumulate in cerebral regions of blood-brain barrier disruption, acting as a valid tool to improve the extent of resection in tumors enhancing at preoperative MRI. Brain neoplasms represent a heterogeneous group of tumors in the pediatric age, constituting the most common solid cancers; they typically show a varying degree of contrast enhancement on MRI. MATERIALS AND METHODS: In March 2016, the authors started a prospective, observational trial to evaluate intraoperative fluorescence's characteristics of CNS tumors, the percentage of extent of resection, thanks to fluorescein aid, and side effects related to fluorescein administration. This report is based on a retrospective analysis of a group of 33 consecutive pediatric patients harboring a supratentorial lesion. RESULTS: In 17 of 33 (51.5%) procedures, fluorescence was reported as intense; in 14 of 33 (42.4%), moderate; and in 2 of 33 (6.1%), slight. Intraoperative fluorescence corresponds to preoperative-MRI-documented contrast enhancement. In 28 of 33 (84.8%) surgical procedures, SF was considered useful; in 2 of 33 (6.1%), partial useful; and in 3 of 33 (9.1%), not essential because the tumor was already recognizable. No adverse effect to SF administration was registered. CONCLUSION: Fluorescein-guided surgery with a dedicated filter on the microscope is a safe and effective technique to improve visualization and resection of different pediatric brain tumors.


Assuntos
Neoplasias Encefálicas , Neoplasias do Sistema Nervoso Central , Neoplasias Supratentoriais , Humanos , Criança , Fluoresceína , Corantes Fluorescentes , Estudos Retrospectivos , Estudos Prospectivos , Procedimentos Neurocirúrgicos/métodos , Neoplasias Encefálicas/diagnóstico por imagem , Neoplasias Encefálicas/cirurgia , Neoplasias Encefálicas/patologia , Neoplasias Supratentoriais/cirurgia , Neoplasias do Sistema Nervoso Central/cirurgia
4.
Int J Mol Sci ; 24(2)2023 Jan 08.
Artigo em Inglês | MEDLINE | ID: mdl-36674749

RESUMO

Moyamoya arteriopathy (MMA) is a rare cerebrovascular disorder that causes recurrent ischemic and hemorrhagic strokes, leading young patients to severe neurological deficits. The pathogenesis of MMA is still unknown. The disease onset in a wide number of pediatric cases raises the question of the role of genetic factors in the disease's pathogenesis. In these patients, MMA's clinical course, or progression, is largely unclear. By performing a comprehensive molecular and cellular profile in the plasma and CSF, respectively, of MMA pediatric patients, our study is aimed at assessing the levels of circulating endothelial progenitor cells (cEPC) and the release of selected proteins at an early disease stage to clarify MMA pathogenesis and progression. We employed cytofluorimetric methods and immunoassays in pediatric MMA patients and matched control subjects by age and sex. We detected increased levels of cEPC in peripheral blood and an upregulation of angiogenic markers in CSF (i.e., angiopoietin-2 and VEGF-A). This finding is probably associated with deregulated angiogenesis, as stated by the moderate severity of collateral vessel network development (Suzuki III-IV). The absence of significant modulation of neurofilament light in CSF led us to rule out the presence of substantial neuronal injury in MMA children. Despite the limited cohort of pediatric patients, we found some peculiar cellular and molecular characteristics in their blood and CSF samples. Our findings may be confirmed by wider and perspective studies to identify predictive or prognostic circulating biomarkers and potential therapeutic targets for personalized care of MMA pediatric patients.


Assuntos
Células Progenitoras Endoteliais , Acidente Vascular Cerebral Hemorrágico , Doença de Moyamoya , Humanos , Criança , Células Progenitoras Endoteliais/patologia , Doença de Moyamoya/patologia
5.
Neuropediatrics ; 52(6): 484-488, 2021 12.
Artigo em Inglês | MEDLINE | ID: mdl-33853164

RESUMO

KIRREL3 is a gene important for the central nervous system development-in particular for the process of neuronal migration, axonal fasciculation, and synaptogenesis-and colocalizes and cooperates in neurons with CASK gene. Alterations of KIRREL3 have been linked to neurodevelopmental disorders, ranging from developmental delay, to autism spectrum disorder, to attention deficit/hyperactivity disorder. The underlying mechanism is not yet fully understood, as it has been hypothesized a fully dominant effect, a risk factor role of KIRREL3 partially penetrating variants, and a recessive inheritance pattern. We report a novel and de novo KIRREL3 mutation in a child affected by severe neurodevelopmental disorder and with brain magnetic resonance imaging evidence of mega cisterna magna and mild cerebellar hypoplasia. This case strengthens the hypothesis that dominant KIRREL3 variants may lead to neurodevelopmental disruption; furthermore, given the strong interaction between KIRREL3 and CASK, we discuss as posterior fossa anomalies may also be part of the phenotype of KIRREL3-related syndrome.


Assuntos
Transtorno do Espectro Autista , Malformações do Sistema Nervoso , Transtornos do Neurodesenvolvimento , Transtorno do Espectro Autista/diagnóstico por imagem , Transtorno do Espectro Autista/genética , Cerebelo/anormalidades , Criança , Deficiências do Desenvolvimento/diagnóstico por imagem , Deficiências do Desenvolvimento/genética , Humanos , Malformações do Sistema Nervoso/diagnóstico por imagem , Malformações do Sistema Nervoso/genética , Transtornos do Neurodesenvolvimento/diagnóstico por imagem , Transtornos do Neurodesenvolvimento/genética
6.
Int J Mol Sci ; 22(24)2021 Dec 14.
Artigo em Inglês | MEDLINE | ID: mdl-34948203

RESUMO

Moyamoya arteriopathy (MA) is a rare cerebrovascular disorder characterized by ischemic/hemorrhagic strokes. The pathophysiology is unknown. A deregulation of vasculogenic/angiogenic/inflammatory pathways has been hypothesized as a possible pathophysiological mechanism. Since lipids are implicated in modulating neo-vascularization/angiogenesis and inflammation, their deregulation is potentially involved in MA. Our aim is to evaluate angiogenic/vasculogenic/inflammatory proteins and lipid profile in plasma of MA patients and control subjects (healthy donors HD or subjects with atherosclerotic cerebrovascular disease ACVD). Angiogenic and inflammatory protein levels were measured by ELISA and a complete lipidomic analysis was performed on plasma by mass spectrometry. ELISA showed a significant decrease for MMP-9 released in plasma of MA. The untargeted lipidomic analysis showed a cumulative depletion of lipid asset in plasma of MA as compared to HD. Specifically, a decrease in membrane complex glycosphingolipids peripherally circulating in MA plasma with respect to HD was observed, likely suggestive of cerebral cellular recruitment. The quantitative targeted approach demonstrated an increase in free sphingoid bases, likely associated with a deregulated angiogenesis. Our findings indicate that lipid signature could play a central role in MA and that a detailed biomarker profile may contribute to untangle the complex, and still obscure, pathogenesis of MA.


Assuntos
Lipídeos/sangue , Doença de Moyamoya/sangue , Doenças Vasculares/sangue , Biomarcadores/sangue , Feminino , Humanos , Inflamação/sangue , Arteriosclerose Intracraniana/sangue , Lipidômica/métodos , Masculino , Pessoa de Meia-Idade , Neovascularização Patológica/sangue
7.
Hum Mutat ; 41(1): 299-315, 2020 01.
Artigo em Inglês | MEDLINE | ID: mdl-31595648

RESUMO

We report 281 individuals carrying a pathogenic recurrent NF1 missense variant at p.Met1149, p.Arg1276, or p.Lys1423, representing three nontruncating NF1 hotspots in the University of Alabama at Birmingham (UAB) cohort, together identified in 1.8% of unrelated NF1 individuals. About 25% (95% confidence interval: 20.5-31.2%) of individuals heterozygous for a pathogenic NF1 p.Met1149, p.Arg1276, or p.Lys1423 missense variant had a Noonan-like phenotype, which is significantly more compared with the "classic" NF1-affected cohorts (all p < .0001). Furthermore, p.Arg1276 and p.Lys1423 pathogenic missense variants were associated with a high prevalence of cardiovascular abnormalities, including pulmonic stenosis (all p < .0001), while p.Arg1276 variants had a high prevalence of symptomatic spinal neurofibromas (p < .0001) compared with "classic" NF1-affected cohorts. However, p.Met1149-positive individuals had a mild phenotype, characterized mainly by pigmentary manifestations without externally visible plexiform neurofibromas, symptomatic spinal neurofibromas or symptomatic optic pathway gliomas. As up to 0.4% of unrelated individuals in the UAB cohort carries a p.Met1149 missense variant, this finding will contribute to more accurate stratification of a significant number of NF1 individuals. Although clinically relevant genotype-phenotype correlations are rare in NF1, each affecting only a small percentage of individuals, together they impact counseling and management of a significant number of the NF1 population.


Assuntos
Alelos , Estudos de Associação Genética , Predisposição Genética para Doença , Mutação de Sentido Incorreto , Neurofibromatose 1/diagnóstico , Neurofibromatose 1/genética , Neurofibromina 1/genética , Substituição de Aminoácidos , Estudos Transversais , Heterozigoto , Humanos , Fenótipo
8.
Int J Mol Sci ; 21(3)2020 Jan 21.
Artigo em Inglês | MEDLINE | ID: mdl-31973107

RESUMO

Thyroid carcinoma is the most common endocrine cancer and includes different forms. Among these, anaplastic thyroid carcinoma (ATC) is the rarest but the most lethal subtype, compared to papillary thyroid carcinoma (PTC) which shows an overall good prognosis. We have previously showed that Tumor Suppressor Candidate 2 (TUSC2), a known tumour suppressor gene, is downregulated in human PTC and ATC compared to normal thyroid samples. The aim of this study was to gain insight into the molecular mechanisms induced by TUSC2 in thyroid cancer cells. Here, we stably transfected TUSC2 in papillary (TPC-1) and in anaplastic (8505C) thyroid cancer cell lines and studied its effects on several biological processes, demonstrating that TUSC2 overexpression decreased thyroid cancer cell proliferation, migration and invasion. Through the proteome profiler apoptosis array, we observed that TUSC2 increased sensitivity to apoptosis by increasing the SMAC/DIABLO and CYTOCHROME C proteins. On the other hand, transient silencing of TUSC2, by siRNA, in an immortalized thyroid follicular epithelial cell line (Nthy-ori 3-1) showed the opposite effect. Finally modulation of SMAC/DIABLO partially rescued the biological effects of TUSC2. Thus, our data highlight a tumour suppressor role of TUSC2 in thyroid carcinogenesis, suggesting that it could be a promising target and biomarker for thyroid carcinoma.


Assuntos
Proteínas Reguladoras de Apoptose/metabolismo , Proteínas Mitocondriais/metabolismo , Fenótipo , Neoplasias da Glândula Tireoide/metabolismo , Proteínas Supressoras de Tumor/antagonistas & inibidores , Proteínas Supressoras de Tumor/metabolismo , Apoptose , Linhagem Celular Tumoral , Movimento Celular , Proliferação de Células/genética , Perfilação da Expressão Gênica , Regulação Neoplásica da Expressão Gênica , Inativação Gênica , Genes Supressores de Tumor , Humanos , RNA Interferente Pequeno , Câncer Papilífero da Tireoide , Carcinoma Anaplásico da Tireoide , Neoplasias da Glândula Tireoide/patologia , Proteínas Supressoras de Tumor/genética
9.
Int J Mol Sci ; 21(16)2020 Aug 11.
Artigo em Inglês | MEDLINE | ID: mdl-32796702

RESUMO

The pathophysiological mechanisms of Moyamoya angiopathy (MA), which is a rare cerebrovascular condition characterized by recurrent ischemic/hemorrhagic strokes, are still largely unknown. An imbalance of vasculogenic/angiogenic mechanisms has been proposed as one possible disease aspect. Circulating endothelial progenitor cells (cEPCs) have been hypothesized to contribute to vascular remodeling of MA, but it remains unclear whether they might be considered a disease effect or have a role in disease pathogenesis. The aim of the present study was to provide a morphological, phenotypical, and functional characterization of the cEPCs from MA patients to uncover their role in the disease pathophysiology. cEPCs were identified from whole blood as CD45dimCD34+CD133+ mononuclear cells. Morphological, biochemical, and functional assays were performed to characterize cEPCs. A significant reduced level of cEPCs was found in blood samples collected from a homogeneous group of adult (mean age 46.86 ± 11.7; 86.36% females), Caucasian, non-operated MA patients with respect to healthy donors (HD; p = 0.032). Since no difference in cEPC characteristics and functionality was observed between MA patients and HD, a defective recruitment mechanism could be involved in the disease pathophysiology. Collectively, our results suggest that cEPC level more than endothelial progenitor cell (EPC) functionality seems to be a potential marker of MA. The validation of our results on a larger population and the correlation with clinical data as well as the use of more complex cellular model could help our understanding of EPC role in MA pathophysiology.


Assuntos
Células Endoteliais/patologia , Leucócitos Mononucleares/patologia , Doença de Moyamoya/fisiopatologia , Remodelação Vascular , Adulto , Biomarcadores/sangue , Contagem de Células , Criança , Citocinas/metabolismo , Feminino , Regulação da Expressão Gênica , Células Endoteliais da Veia Umbilical Humana/metabolismo , Humanos , Masculino , Doença de Moyamoya/sangue , Doença de Moyamoya/genética , Neovascularização Fisiológica , Comunicação Parácrina , RNA Mensageiro/genética , RNA Mensageiro/metabolismo , Remodelação Vascular/genética
10.
Cerebellum ; 18(5): 972-975, 2019 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-31410782

RESUMO

Spinocerebellar Ataxia 23 (SCAR23) is a newly described condition caused by mutations in TDP2 gene. To date, only four patients from two families have been reported, all carrying the same homozygous mutation. We describe a fifth patient, carrying a novel mutation in the same gene, thus confirming the role of TDP2 mutations in determining the disease and defining the main features SCAR23: pediatric onset ataxia and drug-resistant epilepsy and intellectual disability. We further show the clinical presentation which is associated with the neuroradiological evidence of progressive cerebellar atrophy, giving the evidence that SCAR23 can be classified as a degenerative condition.


Assuntos
Proteínas de Ligação a DNA/genética , Epilepsia Resistente a Medicamentos/genética , Deficiência Intelectual/genética , Mutação/genética , Diester Fosfórico Hidrolases/genética , Ataxias Espinocerebelares/genética , Adolescente , Epilepsia Resistente a Medicamentos/complicações , Epilepsia Resistente a Medicamentos/diagnóstico por imagem , Feminino , Humanos , Deficiência Intelectual/complicações , Deficiência Intelectual/diagnóstico por imagem , Ataxias Espinocerebelares/complicações , Ataxias Espinocerebelares/diagnóstico por imagem , Sequenciamento do Exoma/métodos
11.
Neuropediatrics ; 50(5): 334-335, 2019 10.
Artigo em Inglês | MEDLINE | ID: mdl-31141827

RESUMO

Spinal Tuberculosis in children is uncommon, even more so in cases of involvement of posterior vertebral elements, and its diagnosis is often delayed. Here we report the case of a young female presenting neuroradiological features and clinical symptoms suspicious for malignant tumor. Histological examination of biopsy specimen evidenced a Pott's disease. We highlight the importance of suspecting this disorder in children with both aspecific systemic and neurological symptoms, in order to reach a timely diagnosis for appropriate and targeted intervention, avoiding the risk of overtreatment and malpractice claims.


Assuntos
Neoplasias da Coluna Vertebral/diagnóstico por imagem , Neoplasias da Coluna Vertebral/patologia , Tuberculose da Coluna Vertebral/diagnóstico por imagem , Tuberculose da Coluna Vertebral/patologia , Criança , Erros de Diagnóstico , Feminino , Humanos , Coluna Vertebral/diagnóstico por imagem , Coluna Vertebral/patologia
12.
Neurol Sci ; 40(3): 561-570, 2019 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-30604336

RESUMO

BACKGROUND: GENetics of mOyaMoyA (GEN-O-MA) project is a multicenter observational study implemented in Italy aimed at creating a network of centers involved in moyamoya angiopathy (MA) care and research and at collecting a large series and bio-repository of MA patients, finally aimed at describing the disease phenotype and clinical course as well as at identifying biological or cellular markers for disease progression. The present paper resumes the most important study methodological issues and preliminary results. METHODS: Nineteen centers are participating to the study. Patients with both bilateral and unilateral radiologically defined MA are included in the study. For each patient, detailed demographic and clinical as well as neuroimaging data are being collected. When available, biological samples (blood, DNA, CSF, middle cerebral artery samples) are being also collected for biological and cellular studies. RESULTS: Ninety-eight patients (age of onset mean ± SD 35.5 ± 19.6 years; 68.4% females) have been collected so far. 65.3% of patients presented ischemic (50%) and haemorrhagic (15.3%) stroke. A higher female predominance concomitantly with a similar age of onset and clinical features to what was reported in previous studies on Western patients has been confirmed. CONCLUSION: An accurate and detailed clinical and neuroimaging classification represents the best strategy to provide the characterization of the disease phenotype and clinical course. The collection of a large number of biological samples will permit the identification of biological markers and genetic factors associated with the disease susceptibility in Italy.


Assuntos
Redes Comunitárias/estatística & dados numéricos , Doença de Moyamoya , Neuroimagem , Acidente Vascular Cerebral/complicações , Adolescente , Adulto , Idoso , Isquemia Encefálica/complicações , Criança , Pré-Escolar , Progressão da Doença , Feminino , Humanos , Lactente , Recém-Nascido , Itália , Masculino , Pessoa de Meia-Idade , Doença de Moyamoya/diagnóstico por imagem , Doença de Moyamoya/epidemiologia , Doença de Moyamoya/genética , Fenótipo , Estudos Retrospectivos , Adulto Jovem
13.
J Hum Genet ; 63(3): 391, 2018 03.
Artigo em Inglês | MEDLINE | ID: mdl-29479078

RESUMO

Correction to: Journal of Human Genetics advance online publication 27 July 2017; https://doi.org/10.1038/jhg.2017.78.

15.
Am J Med Genet B Neuropsychiatr Genet ; 177(6): 557-562, 2018 09.
Artigo em Inglês | MEDLINE | ID: mdl-30105822

RESUMO

The presence of redundant copy number variants (CNVs) in groups of patients with neurological diseases suggests that these variants could have pathogenic effect. We have collected array comparative genomic hybridization (CGH) data of about 2,500 patients affected by neurocognitive disorders and we observed that CNVs in 2p16.3 locus were as frequent as those in 15q11.2, being both the most frequent unbalances in our cohort of patients. Focusing to 2p16.3 region, unbalances involving NRXN1 coding region have been already associated with neuropsychiatric disorders, although with incomplete penetrance, but little is known about CNVs located proximal to the gene, in the long noncoding RNA AK127244. We found that, in our cohort of patients with neuropsychiatric disorders, the frequency of CNVs involving AK127244 was comparable to that of NRXN1 gene. Patients carrying 2p16.3 unbalances shared some common clinical characteristics regardless NRXN1 and AK127244 CNVs localization, suggesting that the AK127244 long noncoding RNA could be involved in neurocognitive disease with the same effect of NRXN1 unbalances. AK127244 as well as NRXN1 unbalances seem to have a particular influence on language development, behavior or mood, according with the topographic correlation between NRXN1 expression and prefrontal cortex functions.


Assuntos
Cromossomos Humanos Par 2 , Transtornos Mentais/genética , RNA Longo não Codificante/genética , RNA não Traduzido/genética , Adolescente , Adulto , Proteínas de Ligação ao Cálcio , Estudos de Casos e Controles , Moléculas de Adesão Celular Neuronais/genética , Criança , Pré-Escolar , Estudos de Coortes , Hibridização Genômica Comparativa/métodos , Variações do Número de Cópias de DNA , Feminino , Predisposição Genética para Doença , Humanos , Masculino , Transtornos Mentais/metabolismo , Pessoa de Meia-Idade , Proteínas do Tecido Nervoso/genética , Moléculas de Adesão de Célula Nervosa , Fenótipo , RNA Longo não Codificante/metabolismo , RNA não Traduzido/metabolismo
16.
Plant Mol Biol ; 93(3): 283-298, 2017 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-28004241

RESUMO

KEY MESSAGE: We identify proteins that associate with the THO core complex, and show that the TEX1 and MOS11 components functionally interact, affecting mRNA export and splicing as well as plant development. TREX (TRanscription-EXport) is a multiprotein complex that plays a central role in the coordination of synthesis, processing and nuclear export of mRNAs. Using targeted proteomics, we identified proteins that associate with the THO core complex of Arabidopsis TREX. In addition to the RNA helicase UAP56 and the mRNA export factors ALY2-4 and MOS11 we detected interactions with the mRNA export complex TREX-2 and multiple spliceosomal components. Plants defective in the THO component TEX1 or in the mRNA export factor MOS11 (orthologue of human CIP29) are mildly affected. However, tex1 mos11 double-mutant plants show marked defects in vegetative and reproductive development. In tex1 plants, the levels of tasiRNAs are reduced, while miR173 levels are decreased in mos11 mutants. In nuclei of mos11 cells increased mRNA accumulation was observed, while no mRNA export defect was detected with tex1 cells. Nevertheless, in tex1 mos11 double-mutants, the mRNA export defect was clearly enhanced relative to mos11. The subnuclear distribution of TEX1 substantially overlaps with that of splicing-related SR proteins and in tex1 plants the ratio of certain alternative splicing events is altered. Our results demonstrate that Arabidopsis TEX1 and MOS11 are involved in distinct steps of the biogenesis of mRNAs and small RNAs, and that they interact regarding some aspects, but act independently in others.


Assuntos
Processamento Alternativo/genética , Proteínas de Arabidopsis/metabolismo , Arabidopsis/metabolismo , Transporte de RNA , Proteínas de Ligação a RNA/metabolismo , Arabidopsis/ultraestrutura , Proteínas de Arabidopsis/genética , Proteínas de Arabidopsis/isolamento & purificação , Inflorescência/metabolismo , Inflorescência/ultraestrutura , Modelos Biológicos , Fenótipo , Ligação Proteica , Biossíntese de Proteínas , RNA Mensageiro/metabolismo , RNA de Plantas/metabolismo , Proteínas de Ligação a RNA/genética
17.
J Hum Genet ; 62(11): 1001-1004, 2017 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-28747691

RESUMO

Neurofibromatosis type 1 (NF1) is an hereditary disorder characterized by abnormal proliferation of multiple tissues of neural crest origin, and presents mainly with multiple café-au-lait macules, axillary freckling and neurofibromas. Choroidal involvement in NF1 patients has been studied, thanks to the development of non-invasive tools such as infrared monochromatic light during fundus examination, which showed bright patchy lesions consistent with choroidal nodules. Choroidal abnormalities identified with near-infrared reflectance have reported with a frequency of up to 100% in NF1, and have been recently been proposed as a novel diagnostic criterion for NF1. Legius syndrome can be clinically indistinguishable from NF1 and results in a small percentage of individuals being misdiagnosed. We investigated the presence of choroidal abnormalities in Legius syndrome to determine their specificity to NF1 and their potential usefulness as a novel diagnostic criterion for NF1. We examined the fundus of 16 eyes by confocal scanning laser ophthalmoscopy with infrared monochromatic light in eight patients with molecularly confirmed Legius syndrome. No abnormalities were observed, confirming the diagnostic value of choroidal abnormalities for the diagnosis of NF1.


Assuntos
Manchas Café com Leite/diagnóstico , Doenças da Coroide/diagnóstico , Neurofibromatose 1/diagnóstico , Adolescente , Adulto , Idoso , Manchas Café com Leite/complicações , Manchas Café com Leite/diagnóstico por imagem , Manchas Café com Leite/patologia , Criança , Pré-Escolar , Doenças da Coroide/complicações , Doenças da Coroide/diagnóstico por imagem , Doenças da Coroide/patologia , Diagnóstico Diferencial , Feminino , Fundo de Olho , Humanos , Masculino , Pessoa de Meia-Idade , Neurofibromatose 1/complicações , Neurofibromatose 1/diagnóstico por imagem , Neurofibromatose 1/patologia , Oftalmoscopia/métodos
18.
Pediatr Neurol ; 147: 24-27, 2023 10.
Artigo em Inglês | MEDLINE | ID: mdl-37542971

RESUMO

Allan-Herndon-Dudley syndrome (AHDS) is caused by mutations in the SLC16A2 gene, encoding for the monocarboxylate transporter 8 (MCT8). Central hypothyroidism and chronic peripheral thyrotoxicosis result in a severe phenotype, mainly characterized by poor growth, intellectual disability, spastic tetraparesis, and movement disorders, including paroxysmal ones (startle reaction and paroxysmal dyskinesias). Seizures are rarely reported. We conducted a retrospective analysis on video electroencephalography (EEG) recordings in four subjects with AHDS, focused on paroxysmal events. Among other manifestations recorded on EEG, we diagnosed repetitive sleep starts (RSS) in all subjects. RSS are a paroxysmal nonepileptic phenomenon occurring during sleep, similar to epileptic spasms in their clinical and electromyography characteristics, but not related to any EEG change. This is the first report on RSS in AHDS. We present video-EEG polygraphic documentation, suggesting that RSS could be underestimated or misdiagnosed. The importance of a correct diagnosis is crucial in a therapeutic perspective.


Assuntos
Deficiência Intelectual Ligada ao Cromossomo X , Transtornos da Transição Sono-Vigília , Simportadores , Humanos , Estudos Retrospectivos , Transtornos da Transição Sono-Vigília/complicações , Deficiência Intelectual Ligada ao Cromossomo X/genética , Mutação , Hipotonia Muscular/genética , Atrofia Muscular/complicações , Transportadores de Ácidos Monocarboxílicos/genética , Simportadores/genética
19.
J Autism Dev Disord ; 53(2): 615-623, 2023 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-33394245

RESUMO

Autism spectrum disorder (ASD) is a heterogeneous neurodevelopmental condition with a strong genetic basis. We accurately assessed 209 ASD subjects, categorized in complex (47) and essential (162), and performed array comparative genomic hybridization to identify pathogenic and recurrent Copy Number Variants (CNVs). We found 117 CNVs in 75 patients, 11 classified as pathogenic. The complex ASD subjects have higher frequency of pathogenic CNVs with a diagnostic yield of 12.8%. Familiality, cognitive and verbal abilities, severity of autistic symptoms, neuroimaging and neurophysiological findings are not related to genetic data. This study identifies loci of interest for ASD and highlights the importance of a careful phenotypic characterization, as complex ASD is related to higher rate of pathogenic CNVs.


Assuntos
Transtorno do Espectro Autista , Transtornos Globais do Desenvolvimento Infantil , Humanos , Criança , Transtorno do Espectro Autista/diagnóstico , Transtorno do Espectro Autista/genética , Hibridização Genômica Comparativa/métodos , Variações do Número de Cópias de DNA/genética , Cognição
20.
Diagnostics (Basel) ; 13(9)2023 Apr 27.
Artigo em Inglês | MEDLINE | ID: mdl-37174959

RESUMO

BACKGROUND: The present mono-institutional report aimed to describe the cognitive and behavioral outcomes of low-grade central nervous system (CNS) tumors in a cohort of children treated exclusively with surgical intervention. METHODS: Medical records from 2000-2020 were retrospectively analyzed. We included 38 children (mean age at first evaluation 8 years and 3 months, 16 females) who had undergone presurgical cognitive-behavioral evaluation and/or at least 6 months follow-up. Exclusion criteria were a history of traumatic brain injury, stroke, cerebral palsy or cancer-predisposing syndromes. RESULTS: The sample presented cognitive abilities and behavioral functioning in the normal range, with weaknesses in verbal working memory and processing speed. The obtained results suggest that cognitive and behavioral functioning is related to pre-treatment variables (younger age at symptoms' onset, glioneuronal histological type, cortical location with preoperative seizures), timing of surgery and seizure control after surgery, and is stable when controlling for a preoperative cognitive and behavioral baseline. Younger age at onset is confirmed as a particular vulnerability in determining cognitive sequelae, and children at older ages or at longer postsurgical follow-up are at higher risk for developing behavioral disturbances. CONCLUSIONS: Timely treatment is an important factor influencing the global outcome and daily functioning of the patients. Preoperative and regular postsurgical cognitive and behavioral assessment, also several years after surgery, should be included in standard clinical practices.

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