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  1. Article ; Online: Phelan McDermid Syndrome

    Sarah Jesse / Jan Philipp Delling / Michael Schön / Tobias M Boeckers / Albert Ludolph / Makbule Senel

    International Journal of Molecular Sciences, Vol 22, Iss 5, p

    Multiple Sclerosis as a Rare but Treatable Cause for Regression—A Case Report

    2021  Volume 2311

    Abstract: Phelan McDermid syndrome (PMcD) is a neurogenetic disease associated with haploinsufficiency of the SHANK3 gene due to a spectrum of anomalies in the terminal region of the long arm of chromosome 22. SHANK3 is the abbreviation for SH3 domain and ankyrin ... ...

    Abstract Phelan McDermid syndrome (PMcD) is a neurogenetic disease associated with haploinsufficiency of the SHANK3 gene due to a spectrum of anomalies in the terminal region of the long arm of chromosome 22. SHANK3 is the abbreviation for SH3 domain and ankyrin repeat-containing protein, a gene that encodes for proteins of the postsynaptic density (PSD) of excitatory synapses. This PSD is relevant for the induction and plasticity of spine and synapse formation as a basis for learning processes and long-term potentiation. Individuals with PMcD present with intellectual disability, muscular hypotonia, and severely delayed or absent speech. Further neuropsychiatric manifestations cover symptoms of the autism spectrum, epilepsy, bipolar disorders, schizophrenia, and regression. Regression is one of the most feared syndromes by relatives of PMcD patients. Current scientific evidence indicates that the onset of regression is variable and affects language, motor skills, activities of daily living and cognition. In the case of regression, patients normally undergo further diagnostics to exclude treatable reasons such as complex-focal seizures or psychiatric comorbidities. Here, we report, for the first time, the case of a young female who developed progressive symptoms of regression and a dystonic-spastic hemiparesis that could be traced back to a comorbid multiple sclerosis and that improved after treatment with methylprednisolone.
    Keywords multiple sclerosis ; autoimmune diseases ; Phelan McDermid syndrome ; genetic autism spectrum ; regression ; SHANK3 ; Biology (General) ; QH301-705.5 ; Chemistry ; QD1-999
    Subject code 572
    Language English
    Publishing date 2021-02-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article ; Online: Deletion of the Autism-Associated Protein SHANK3 Abolishes Structural Synaptic Plasticity after Brain Trauma

    Carolina Urrutia-Ruiz / Daniel Rombach / Silvia Cursano / Susanne Gerlach-Arbeiter / Michael Schoen / Juergen Bockmann / Maria Demestre / Tobias M. Boeckers

    International Journal of Molecular Sciences, Vol 23, Iss 6081, p

    2022  Volume 6081

    Abstract: Autism spectrum disorders (ASDs) are characterized by repetitive behaviors and impairments of sociability and communication. About 1% of ASD cases are caused by mutations of SHANK3 , a major scaffolding protein of the postsynaptic density. We studied the ...

    Abstract Autism spectrum disorders (ASDs) are characterized by repetitive behaviors and impairments of sociability and communication. About 1% of ASD cases are caused by mutations of SHANK3 , a major scaffolding protein of the postsynaptic density. We studied the role of SHANK3 in plastic changes of excitatory synapses within the central nervous system by employing mild traumatic brain injury (mTBI) in WT and Shank3 knockout mice. In WT mice, mTBI triggered ipsi- and contralateral loss of hippocampal dendritic spines and excitatory synapses with a partial recovery over time. In contrast, no significant synaptic alterations were detected in Shank3 ∆ 11−/− mice, which showed fewer dendritic spines and excitatory synapses at baseline. In line, mTBI induced the upregulation of synaptic plasticity-related proteins Arc and p-cofilin only in WT mice. Interestingly, microglia proliferation was observed in WT mice after mTBI but not in Shank3 ∆ 11−/− mice. Finally, we detected TBI-induced increased fear memory at the behavioral level, whereas in Shank3 ∆ 11−/− animals, the already-enhanced fear memory levels increased only slightly after mTBI. Our data show the lack of structural synaptic plasticity in Shank3 knockout mice that might explain at least in part the rigidity of behaviors, problems in adjusting to new situations and cognitive deficits seen in ASDs.
    Keywords ASD ; TBI ; SHANK3 ; trauma ; synapses ; plasticity ; Biology (General) ; QH301-705.5 ; Chemistry ; QD1-999
    Subject code 572
    Language English
    Publishing date 2022-05-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article ; Online: CLARITY increases sensitivity and specificity of fluorescence immunostaining in long-term archived human brain tissue

    Sarah Woelfle / Dhruva Deshpande / Simone Feldengut / Heiko Braak / Kelly Del Tredici / Francesco Roselli / Karl Deisseroth / Jens Michaelis / Tobias M. Boeckers / Michael Schön

    BMC Biology, Vol 21, Iss 1, Pp 1-

    2023  Volume 28

    Abstract: Abstract Background Post mortem human brain tissue is an essential resource to study cell types, connectivity as well as subcellular structures down to the molecular setup of the central nervous system especially with respect to the plethora of brain ... ...

    Abstract Abstract Background Post mortem human brain tissue is an essential resource to study cell types, connectivity as well as subcellular structures down to the molecular setup of the central nervous system especially with respect to the plethora of brain diseases. A key method is immunostaining with fluorescent dyes, which allows high-resolution imaging in three dimensions of multiple structures simultaneously. Although there are large collections of formalin-fixed brains, research is often limited because several conditions arise that complicate the use of human brain tissue for high-resolution fluorescence microscopy. Results In this study, we developed a clearing approach for immunofluorescence-based analysis of perfusion- and immersion-fixed post mortem human brain tissue, termed human Clear Lipid-exchanged Acrylamide-hybridized Rigid Imaging / Immunostaining / In situ hybridization-compatible Tissue-hYdrogel (hCLARITY). hCLARITY is optimized for specificity by reducing off-target labeling and yields very sensitive stainings in human brain sections allowing for super-resolution microscopy with unprecedented imaging of pre- and postsynaptic compartments. Moreover, hallmarks of Alzheimer’s disease were preserved with hCLARITY, and importantly classical 3,3’-diaminobenzidine (DAB) or Nissl stainings are compatible with this protocol. hCLARITY is very versatile as demonstrated by the use of more than 30 well performing antibodies and allows for de- and subsequent re-staining of the same tissue section, which is important for multi-labeling approaches, e.g., in super-resolution microscopy. Conclusions Taken together, hCLARITY enables research of the human brain with high sensitivity and down to sub-diffraction resolution. It therefore has enormous potential for the investigation of local morphological changes, e.g., in neurodegenerative diseases.
    Keywords Alzheimer’s disease ; CLARITY ; Human brain archive ; Immunofluorescence ; Post mortem human brain tissue ; Super-resolution microscopy (STED ; dSTORM) ; Biology (General) ; QH301-705.5
    Subject code 616
    Language English
    Publishing date 2023-05-01T00:00:00Z
    Publisher BMC
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  4. Article ; Online: Restoring Axonal Organelle Motility and Regeneration in Cultured FUS-ALS Motoneurons through Magnetic Field Stimulation Suggests an Alternative Therapeutic Approach

    Wonphorn Kandhavivorn / Hannes Glaß / Thomas Herrmannsdörfer / Tobias M. Böckers / Marc Uhlarz / Jonas Gronemann / Richard H. W. Funk / Jens Pietzsch / Arun Pal / Andreas Hermann

    Cells, Vol 12, Iss 1502, p

    2023  Volume 1502

    Abstract: Amyotrophic lateral sclerosis (ALS) is a devastating motoneuron disease characterized by sustained loss of neuromuscular junctions, degenerating corticospinal motoneurons and rapidly progressing muscle paralysis. Motoneurons have unique features, ... ...

    Abstract Amyotrophic lateral sclerosis (ALS) is a devastating motoneuron disease characterized by sustained loss of neuromuscular junctions, degenerating corticospinal motoneurons and rapidly progressing muscle paralysis. Motoneurons have unique features, essentially a highly polarized, lengthy architecture of axons, posing a considerable challenge for maintaining long-range trafficking routes for organelles, cargo, mRNA and secretion with a high energy effort to serve crucial neuronal functions. Impaired intracellular pathways implicated in ALS pathology comprise RNA metabolism, cytoplasmic protein aggregation, cytoskeletal integrity for organelle trafficking and maintenance of mitochondrial morphology and function, cumulatively leading to neurodegeneration. Current drug treatments only have marginal effects on survival, thereby calling for alternative ALS therapies. Exposure to magnetic fields, e.g., transcranial magnetic stimulations (TMS) on the central nervous system (CNS), has been broadly explored over the past 20 years to investigate and improve physical and mental activities through stimulated excitability as well as neuronal plasticity. However, studies of magnetic treatments on the peripheral nervous system are still scarce. Thus, we investigated the therapeutic potential of low frequency alternating current magnetic fields on cultured spinal motoneurons derived from induced pluripotent stem cells of FUS-ALS patients and healthy persons. We report a remarkable restoration induced by magnetic stimulation on axonal trafficking of mitochondria and lysosomes and axonal regenerative sprouting after axotomy in FUS-ALS in vitro without obvious harmful effects on diseased and healthy neurons. These beneficial effects seem to derive from improved microtubule integrity. Thus, our study suggests the therapeutic potential of magnetic stimulations in ALS, which awaits further exploration and validation in future long-term in vivo studies.
    Keywords amyotrophic lateral sclerosis ; induced pluripotent stem cells ; AC electromagnetic stimulation ; axonopathy ; axonal organelle trafficking ; axonal sprouting ; Biology (General) ; QH301-705.5
    Subject code 610
    Language English
    Publishing date 2023-05-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  5. Article ; Online: Altered Intestinal Morphology and Microbiota Composition in the Autism Spectrum Disorders Associated SHANK3 Mouse Model

    Ann Katrin Sauer / Juergen Bockmann / Konrad Steinestel / Tobias M. Boeckers / Andreas M. Grabrucker

    International Journal of Molecular Sciences, Vol 20, Iss 9, p

    2019  Volume 2134

    Abstract: Autism spectrum disorders (ASD) are a group of neurodevelopmental disorders characterized by deficits in social interaction and communication, and repetitive behaviors. In addition, co-morbidities such as gastro-intestinal problems have frequently been ... ...

    Abstract Autism spectrum disorders (ASD) are a group of neurodevelopmental disorders characterized by deficits in social interaction and communication, and repetitive behaviors. In addition, co-morbidities such as gastro-intestinal problems have frequently been reported. Mutations and deletion of proteins of the SH3 and multiple ankyrin repeat domains ( SHANK ) gene-family were identified in patients with ASD, and Shank knock-out mouse models display autism-like phenotypes. SHANK3 proteins are not only expressed in the central nervous system (CNS). Here, we show expression in gastrointestinal (GI) epithelium and report a significantly different GI morphology in Shank3 knock-out (KO) mice. Further, we detected a significantly altered microbiota composition measured in feces of Shank3 KO mice that may contribute to inflammatory responses affecting brain development. In line with this, we found higher E. coli lipopolysaccharide levels in liver samples of Shank3 KO mice, and detected an increase in Interleukin-6 and activated astrocytes in Shank3 KO mice. We conclude that apart from its well-known role in the CNS, SHANK3 plays a specific role in the GI tract that may contribute to the ASD phenotype by extracerebral mechanisms.
    Keywords microbiome ; gut ; ProSAP2 ; Phelan McDermid Syndrome ; gut–brain interaction ; leaky gut ; IL-6 ; SHANK ; Biology (General) ; QH301-705.5 ; Chemistry ; QD1-999
    Subject code 616
    Language English
    Publishing date 2019-04-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  6. Article ; Online: Effects of Trace Metal Profiles Characteristic for Autism on Synapses in Cultured Neurons

    Simone Hagmeyer / Katharina Mangus / Tobias M. Boeckers / Andreas M. Grabrucker

    Neural Plasticity, Vol

    2015  Volume 2015

    Keywords Medicine ; R ; Internal medicine ; RC31-1245 ; Neurosciences. Biological psychiatry. Neuropsychiatry ; RC321-571
    Publishing date 2015-01-01T00:00:00Z
    Publisher Hindawi Publishing Corporation
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  7. Article ; Online: Phelan-McDermid syndrome

    Katy Phelan / Luigi Boccuto / Craig M. Powell / Tobias M. Boeckers / Conny van Ravenswaaij-Arts / R. Curtis Rogers / Carlo Sala / Chiara Verpelli / Audrey Thurm / William E. Bennett / Christopher J. Winrow / Sheldon R. Garrison / Roberto Toro / Thomas Bourgeron

    Orphanet Journal of Rare Diseases, Vol 17, Iss 1, Pp 1-

    a classification system after 30 years of experience

    2022  Volume 4

    Abstract: Abstract Phelan-McDermid syndrome (PMS) was initially called the 22q13 deletion syndrome based on its etiology as a deletion of the distal long arm of chromosome 22. These included terminal and interstitial deletions, as well as other structural ... ...

    Abstract Abstract Phelan-McDermid syndrome (PMS) was initially called the 22q13 deletion syndrome based on its etiology as a deletion of the distal long arm of chromosome 22. These included terminal and interstitial deletions, as well as other structural rearrangements. Later, pathogenetic variants and deletions of the SHANK3 gene were found to result in a phenotype consistent with PMS. The association between SHANK3 and PMS led investigators to consider disruption/deletion of SHANK3 to be a prerequisite for diagnosing PMS. This narrow definition of PMS based on the involvement of SHANK3 has the adverse effect of causing patients with interstitial deletions of chromosome 22 to “lose” their diagnosis. It also results in underreporting of individuals with interstitial deletions of 22q13 that preserve SHANK3. To reduce the confusion for families, clinicians, researchers, and pharma, a simple classification for PMS has been devised. PMS and will be further classified as PMS-SHANK3 related or PMS-SHANK3 unrelated. PMS can still be used as a general term, but this classification system is inclusive. It allows researchers, regulatory agencies, and other stakeholders to define SHANK3 alterations or interstitial deletions not affecting the SHANK3 coding region.
    Keywords Phelan-McDermid syndrome ; PMS ; SHANK3 ; 22q13 deletion ; Medicine ; R
    Subject code 572
    Language English
    Publishing date 2022-01-01T00:00:00Z
    Publisher BMC
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  8. Article ; Online: Poly(I:C)-induced maternal immune activation causes elevated self-grooming in male rat offspring

    Xing-Yu Lan / You-Yu Gu / Ming-Juan Li / Tian-Jia Song / Fu-Jun Zhai / Yong Zhang / Jiang-Shan Zhan / Tobias M. Böckers / Xiao-Nan Yue / Jia-Nan Wang / Shuo Yuan / Meng-Ying Jin / Yu-Fei Xie / Wan-Wen Dang / Hai-Heng Hong / Zi-Rui Guo / Xue-Wei Wang / Rong Zhang

    Frontiers in Cell and Developmental Biology, Vol

    Involvement of abnormal postpartum static nursing in dam

    2023  Volume 11

    Abstract: Introduction: Maternal immune activation (MIA) is closely related to the onset of autism-like behaviors in offspring, but the mechanism remains unclear. Maternal behaviors can influence offspring’s development and behaviors, as indicated in both human ... ...

    Abstract Introduction: Maternal immune activation (MIA) is closely related to the onset of autism-like behaviors in offspring, but the mechanism remains unclear. Maternal behaviors can influence offspring’s development and behaviors, as indicated in both human and animal studies. We hypothesized that abnormal maternal behaviors in MIA dams might be other factors leading to delayed development and abnormal behaviors in offspring.Methods: To verify our hypothesis, we analyzed poly(I:C)-induced MIA dam’s postpartum maternal behavior and serum levels of several hormones related to maternal behavior. Pup’s developmental milestones and early social communication were recorded and evaluated in infancy. Other behavioral tests, including three-chamber test, self-grooming test, open field test, novel object recognition test, rotarod test and maximum grip test, were performed in adolescence of pups.Results: Our results showed that MIA dams exhibit abnormal static nursing behavior but normal basic care and dynamic nursing behavior. The serum levels of testosterone and arginine vasopressin in MIA dams were significantly reduced compared with control dams. The developmental milestones, including pinna detachment, incisor eruption and eye opening, were significantly delayed in MIA offspring compared with control offspring, while the weight and early social communication showed no significant differences between the two groups. Behavioral tests performed in adolescence showed that only male MIA offspring display elevated self-grooming behaviors and reduced maximum grip.Discussion: In conclusion, MIA dams display abnormal postpartum static nursing behavior concomitantly with reduced serum levels of testosterone and arginine vasopressin, possibly involving in the pathogenesis of delayed development and elevated self-grooming in male offspring. These findings hint that improving dam’s postpartum maternal behavior might be a potential regime to counteract delayed development and elevated self-grooming in male MIA offspring.
    Keywords poly (I:C) ; maternal immune activation ; autism-like behavior ; maternal behavior ; dam ; offspring ; Biology (General) ; QH301-705.5
    Subject code 150
    Language English
    Publishing date 2023-03-01T00:00:00Z
    Publisher Frontiers Media S.A.
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  9. Article: Structure of an unconventional SH3 domain from the postsynaptic density protein Shank3 at ultrahigh resolution

    Ponna, Srinivas Kumar / Matti Myllykoski / Tobias M. Boeckers / Petri Kursula

    Biochemical and biophysical research communications. 2017,

    2017  

    Abstract: The Shank family comprises three large multi-domain proteins playing central roles as protein scaffolds in the neuronal postsynaptic density. The Shank proteins are closely linked to neuropsychiatric diseases, such as autism spectrum disorders. One ... ...

    Abstract The Shank family comprises three large multi-domain proteins playing central roles as protein scaffolds in the neuronal postsynaptic density. The Shank proteins are closely linked to neuropsychiatric diseases, such as autism spectrum disorders. One characteristic domain in the Shank family is the SH3 domain, assumed to play a role in protein-protein interactions; however, no specific ligand binding to any Shank SH3 domain has been described. We solved the crystal structure of the SH3 domain from Shank3 at sub-atomic resolution. While the structure presents the canonical SH3 domain fold, the binding site for proline-rich peptides is not conserved. In line with this, no binding of Pro-rich sequences by the Shank3 SH3 domain was observed. Sequence comparisons indicate that all Shank isoforms have similarly lost the classical Pro-rich peptide binding site from the SH3 domain. Whether the corresponding site in the Shank SH3 domains has evolved to bind a non-poly-Pro target sequence is currently not known. Our work provides an intriguing example of the evolution of a well-characterized protein-protein interaction domain within the context of multi-domain protein scaffolds, allowing the conservation of structural features, but losing canonical functional sites. The data are further discussed in light of known mutations in the SH3 domain or its vicinity in the different Shank isoforms.
    Keywords autism ; binding sites ; crystal structure ; evolution ; ligands ; mutation ; neurons ; peptides ; protein-protein interactions ; scaffolding proteins ; sequence analysis
    Language English
    Size p. .
    Publishing place Elsevier Inc.
    Document type Article
    Note Pre-press version
    ZDB-ID 205723-2
    ISSN 0006-291X ; 0006-291X
    ISSN (online) 0006-291X
    ISSN 0006-291X
    DOI 10.1016/j.bbrc.2017.06.121
    Database NAL-Catalogue (AGRICOLA)

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  10. Article ; Online: NEK1 loss-of-function mutation induces DNA damage accumulation in ALS patient-derived motoneurons

    Julia Higelin / Alberto Catanese / Lena Luisa Semelink-Sedlacek / Sertap Oeztuerk / Anne-Kathrin Lutz / Julia Bausinger / Gotthold Barbi / Günter Speit / Peter M. Andersen / Albert C. Ludolph / Maria Demestre / Tobias M. Boeckers

    Stem Cell Research, Vol 30, Iss , Pp 150-

    2018  Volume 162

    Abstract: Mutations in genes coding for proteins involved in DNA damage response (DDR) and repair, such as C9orf72 and FUS (Fused in Sarcoma), are associated with neurodegenerative diseases and lead to amyotrophic lateral sclerosis (ALS). Heterozygous loss-of- ... ...

    Abstract Mutations in genes coding for proteins involved in DNA damage response (DDR) and repair, such as C9orf72 and FUS (Fused in Sarcoma), are associated with neurodegenerative diseases and lead to amyotrophic lateral sclerosis (ALS). Heterozygous loss-of-function mutations in NEK1 (NIMA-related kinase 1) have also been recently found to cause ALS. NEK1 codes for a multifunctional protein, crucially involved in mitotic checkpoint control and DDR. To resolve pathological alterations associated with NEK1 mutation, we compared hiPSC-derived motoneurons carrying a NEK1 mutation with mutant C9orf72 and wild type neurons at basal level and after DNA damage induction. Motoneurons carrying a C9orf72 mutation exhibited cell specific signs of increased DNA damage. This phenotype was even more severe in NEK1c.2434A>T neurons that showed significantly increased DNA damage at basal level and impaired DDR after induction of DNA damage in an maturation-dependent manner. Our results provide first mechanistic insight in pathophysiological alterations induced by NEK1 mutations and point to a converging pathomechanism of different gene mutations causative for ALS. Therefore, our study contributes to the development of novel therapeutic strategies to reduce DNA damage accumulation in neurodegenerative diseases and ALS. Keywords: hiPSC, ALS, NEK1, Neurodegeneration, DNA damage
    Keywords Biology (General) ; QH301-705.5
    Language English
    Publishing date 2018-07-01T00:00:00Z
    Publisher Elsevier
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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