Cerebellar extinction lesions can manifest themselves with cerebellar motor and cerebellar cognitive affective syndromes. For investigation of the functions of the cerebellum and the pathogenesis of cerebellar diseases, particularly hereditary neurodegenerative cerebellar ataxias, various cerebellar mutant mice are used. The Lurcher mouse is a model of selective olivocerebellar degeneration with early onset and rapid progress. These mice show both motor deficits as well as cognitive and behavioral changes i.e., pathological phenotype in the functional domains affected in cerebellar patients. Therefore, Lurcher mice might be considered as a tool to investigate the mechanisms of functional impairments caused by cerebellar degenerative diseases. There are, however, limitations due to the particular features of the neurodegenerative process and a lack of possibilities to examine some processes in mice. The main advantage of Lurcher mice would be the expected absence of significant neuropathologies outside the olivocerebellar system that modify the complex behavioral phenotype in less selective models. However, detailed examinations and further thorough validation of the model are needed to verify this assumption.

• MeSH
• cerebelární ataxie genetika   patofyziologie   patologie   MeSH
• lidé MeSH
• modely nemocí na zvířatech * MeSH
• mozeček patologie   patofyziologie   MeSH
• myši - mutanty neurologické MeSH
• myši MeSH
• nemoci mozečku * patologie   patofyziologie   genetika   MeSH
• zvířata MeSH
• Check Tag
• lidé MeSH
• myši MeSH
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH
• přehledy MeSH

Ataxia-telangiectasia (A-T) is an autosomal-recessive disorder caused by pathogenic variants (PVs) of the ATM gene, predisposing children to hematological malignancies. We investigated their characteristics and outcomes to generate data-based treatment recommendations. In this multinational, observational study we report 202 patients aged ≤25 years with A-T and hematological malignancies from 25 countries. Ninety-one patients (45%) presented with mature B-cell lymphomas, 82 (41%) with acute lymphoblastic leukemia/lymphoma, 21 (10%) with Hodgkin lymphoma and 8 (4%) with other hematological malignancies. Four-year overall survival and event-free survival (EFS) were 50.8% (95% confidence interval [CI], 43.6-59.1) and 47.9% (95% CI 40.8-56.2), respectively. Cure rates have not significantly improved over the last four decades (P = .76). The major cause of treatment failure was treatment-related mortality (TRM) with a four-year cumulative incidence of 25.9% (95% CI, 19.5-32.4). Germ line ATM PVs were categorized as null or hypomorphic and patients with available genetic data (n = 110) were classified as having absent (n = 81) or residual (n = 29) ATM kinase activity. Four-year EFS was 39.4% (95% CI, 29-53.3) vs 78.7% (95% CI, 63.7-97.2), (P < .001), and TRM rates were 37.6% (95% CI, 26.4-48.7) vs 4.0% (95% CI, 0-11.8), (P = .017), for those with absent and residual ATM kinase activity, respectively. Absence of ATM kinase activity was independently associated with decreased EFS (HR = 0.362, 95% CI, 0.16-0.82; P = .009) and increased TRM (hazard ratio [HR] = 14.11, 95% CI, 1.36-146.31; P = .029). Patients with A-T and leukemia/lymphoma may benefit from deescalated therapy for patients with absent ATM kinase activity and near-standard therapy regimens for those with residual kinase activity.

• MeSH
• ATM protein * genetika   MeSH
• dítě MeSH
• dospělí MeSH
• hematologické nádory * genetika   mortalita   MeSH
• kojenec MeSH
• lidé MeSH
• mladiství MeSH
• mladý dospělý MeSH
• předškolní dítě MeSH
• teleangiektatická ataxie * genetika   komplikace   mortalita   MeSH
• zárodečné mutace * MeSH
• Check Tag
• dítě MeSH
• dospělí MeSH
• kojenec MeSH
• lidé MeSH
• mladiství MeSH
• mladý dospělý MeSH
• mužské pohlaví MeSH
• předškolní dítě MeSH
• ženské pohlaví MeSH
• Publikační typ
• časopisecké články MeSH
• multicentrická studie MeSH
• pozorovací studie MeSH

OBJECTIVE: To evaluate the reliability, responsiveness, and validity of the Scale for the Assessment and Rating of Ataxia (SARA) in patients with lysosomal storage disorders (LSDs) who present with neurological symptoms, and quantify the threshold for a clinically meaningful change. METHODS: We analyzed data from three clinical trial cohorts (IB1001-201, IB1001-202, and IB1001-301) of patients with Niemann-Pick disease type C (NPC) and GM2 Gangliosidoses (Tay-Sachs and Sandhoff disease) comprising 122 patients and 703 visits. Reproducibility was described as re-test reliability between repeat baseline visits or baseline and post-treatment washout visits. Responsiveness was determined in relation to the Investigator's, Caregiver's, and Patient's Clinical Global Impression of Improvement (CGI-I). The CGI-I data was also used to quantify a threshold for a clinically meaningful improvement on the SARA scale. Using a qualitative methods approach, patient/caregiver interviews from the IB1001-301 trial were further used to assess a threshold of meaningful change as well as the breadth of neurological signs and symptoms captured and evaluated by the SARA scale. RESULTS: The Inter-Class Correlation (ICC) was 0.95 or greater for all three trials, indicating a high internal consistency/reliability. The mean change in SARA between repeat baseline and post-treatment washout visit assessments in all trials was -0.05, SD 1.98, i.e., minimal, indicating no significant differences, learning effects or other systematic biases. For the CGI-I responses and change in SARA scores, Area Under the Curve (AUC) values were 0.82, 0.71, and 0.77 for the Investigator's, Caregiver's, and Patient's CGI-I respectively, indicating strong agreement. Further qualitative analyses of the patient/caregiver interviews demonstrated a 1-point or greater change on SARA to be a clinically meaningful improvement which is directly relevant to the patient's everyday functioning and quality of life. Changes captured by the SARA were also paralleled by improvement in a broad range of neurological signs and symptoms and beyond cerebellar ataxia. CONCLUSION: Qualitative and quantitative data demonstrate the reliability and responsiveness of the SARA score as a valid measure of neurological signs and symptoms in LSDs with CNS involvement, such as NPC and GM2 Gangliosidoses. A 1-point change represents a clinically meaningful transition reflecting the gain or loss of complex function.

• MeSH
• ataxie * diagnóza   patofyziologie   etiologie   MeSH
• dítě MeSH
• dospělí MeSH
• hodnocení výsledků zdravotní péče normy   MeSH
• kohortové studie MeSH
• lidé středního věku MeSH
• lidé MeSH
• lyzozomální nemoci z ukládání diagnóza   MeSH
• mladiství MeSH
• mladý dospělý MeSH
• předškolní dítě MeSH
• reprodukovatelnost výsledků MeSH
• stupeň závažnosti nemoci MeSH
• Check Tag
• dítě MeSH
• dospělí MeSH
• lidé středního věku MeSH
• lidé MeSH
• mladiství MeSH
• mladý dospělý MeSH
• mužské pohlaví MeSH
• předškolní dítě MeSH
• ženské pohlaví MeSH
• Publikační typ
• časopisecké články MeSH

Ataxie­‐telangiektázie (AT) je autozomálně recesivně děděné onemocnění charakterizované pomalu progredující mozečkovou ataxií, telangiektáziemi a zvýšenou citlivostí k ionizačnímu záření. Často se vyvíjí imunodeficit projevující se opakujícími respiračními infekcemi. Dalšími klinickými projevy může být okulomotorická apraxie nebo extrapyramidové projevy. Pacienti jsou predisponováni ke vzniku hematologických malignit i solidních nádorů. AT je nejčastější příčinou progresivní ataxie u dětí mladších 10 let. Cílem tohoto článku je upozornit na toto onemocnění a poukázat na diagnostiku a možnosti symptomatické terapie. Jako příklad uvádím dvě kazuistiky z našeho oddělení.

Ataxia-telangiectasia (AT) is an autosomal recessively disorder characterized by slowly progressive cerebellar ataxia, telangiectasia and heightended sensitivity to ionizing radiation. The condition often leads to immunodeficiency, presenting as recurrent respiratory infections. Other clinical manifestations may include oculomotor apraxia or extrapyramidal symptoms. Furthermore, patients are predisposed to hematological malignancies and solid tumors. In children under the age of 10, AT represents the most prevalent cause of progressive ataxia. This article aims to raise awareness of AT, providing an overview of its diagnosis and available options for symptomatic therapy. To illustrate these aspects, I present two case reports from our department.

• MeSH
• alfa-fetoproteiny analýza   MeSH
• apraxie diagnóza   etiologie   klasifikace   MeSH
• diferenciální diagnóza MeSH
• dítě MeSH
• kazuistiky jako téma MeSH
• lidé MeSH
• mezioborová komunikace MeSH
• motorické poruchy diagnóza   etiologie   MeSH
• předškolní dítě MeSH
• teleangiektatická ataxie * diagnóza   farmakoterapie   genetika   MeSH
• teleangiektazie diagnóza   klasifikace   MeSH
• těžká kombinovaná imunodeficience diagnóza   etiologie   MeSH
• Check Tag
• dítě MeSH
• lidé MeSH
• mužské pohlaví MeSH
• předškolní dítě MeSH
• Publikační typ
• přehledy MeSH

BACKGROUND: Spinocerebellar ataxia 21 (SCA21) is a rare neurological disorder caused by heterozygous variants in TMEM240. A growing, yet still limited number of reports suggested that hyperkinetic movements should be considered a defining component of the disease. CASE SERIES: We describe two newly identified families harboring the recurrent pathogenic TMEM240 p.Pro170Leu variant. Both index patients and the mother of the first proband developed movement disorders, manifesting as myoclonic dystonia and action-induced dystonia without co-occurring ataxia in one case, and pancerebellar syndrome complicated by action-induced dystonia in the other. We reviewed the literature on TMEM240 variants linked to hyperkinetic disorders, comparing our cases to described phenotypes. DISCUSSION: Adding to prior preliminary observations, our series highlights the relevance of hyperkinetic movements as clinically meaningful features of SCA21. TMEM240 mutation should be included in the differential diagnosis of myoclonic dystonia and ataxia-dystonia syndromes.

• MeSH
• ataxie MeSH
• dystonické poruchy * MeSH
• dystonie * diagnóza   genetika   MeSH
• hyperkineze MeSH
• lidé MeSH
• membránové proteiny MeSH
• myoklonus * diagnóza   genetika   MeSH
• spinocerebelární degenerace * MeSH
• syndrom MeSH
• vzácné nemoci MeSH
• Check Tag
• lidé MeSH
• Publikační typ
• kazuistiky MeSH
• přehledy MeSH

Characterizing bedside oculomotor deficits is a critical factor in defining the clinical presentation of hereditary ataxias. Quantitative assessments are increasingly available and have significant advantages, including comparability over time, reduced examiner dependency, and sensitivity to subtle changes. To delineate the potential of quantitative oculomotor assessments as digital-motor outcome measures for clinical trials in ataxia, we searched MEDLINE for articles reporting on quantitative eye movement recordings in genetically confirmed or suspected hereditary ataxias, asking which paradigms are most promising for capturing disease progression and treatment response. Eighty-nine manuscripts identified reported on 1541 patients, including spinocerebellar ataxias (SCA2, n = 421), SCA3 (n = 268), SCA6 (n = 117), other SCAs (n = 97), Friedreich ataxia (FRDA, n = 178), Niemann-Pick disease type C (NPC, n = 57), and ataxia-telangiectasia (n = 85) as largest cohorts. Whereas most studies reported discriminatory power of oculomotor assessments in diagnostics, few explored their value for monitoring genotype-specific disease progression (n = 2; SCA2) or treatment response (n = 8; SCA2, FRDA, NPC, ataxia-telangiectasia, episodic-ataxia 4). Oculomotor parameters correlated with disease severity measures including clinical scores (n = 18 studies (SARA: n = 9)), chronological measures (e.g., age, disease duration, time-to-symptom onset; n = 17), genetic stratification (n = 9), and imaging measures of atrophy (n = 5). Recurrent correlations across many ataxias (SCA2/3/17, FRDA, NPC) suggest saccadic eye movements as potentially generic quantitative oculomotor outcome. Recommendation of other paradigms was limited by the scarcity of cross-validating correlations, except saccadic intrusions (FRDA), pursuit eye movements (SCA17), and quantitative head-impulse testing (SCA3/6). This work aids in understanding the current knowledge of quantitative oculomotor parameters in hereditary ataxias, and identifies gaps for validation as potential trial outcome measures in specific ataxia genotypes.

• MeSH
• ataxie MeSH
• Friedreichova ataxie * MeSH
• genotyp MeSH
• lidé MeSH
• pohyby očí MeSH
• progrese nemoci MeSH
• spinocerebelární degenerace * MeSH
• teleangiektatická ataxie * MeSH
• Check Tag
• lidé MeSH
• Publikační typ
• časopisecké články MeSH

Tayova-Sachsova choroba je raritné autozomálne recesívne podmienené ochorenie zapríčinené deficitom enzýmu β-hexozaminidázy A (HexA). Dochádza k akumulácii GM2 gangliozidov v lyzozómoch neurónov, čo potenciuje ich toxický účinok a navodzuje tak postupnú neurodegeneráciu. Presný mechanizmus spustenia zániku neurónov je stále neznámy. Pre zachovanú reziduálnu aktivitu enzýmu HexA má adultná forma ochorenia zvyčajne miernejší priebeh ako infantilná forma. Klinický obraz je nešpecifický, preto je ochorenie výrazne poddiagnostikované. V našej videokazuistike prezentujeme prípad 49-ročného pacienta s geneticky potvrdenou adultnou formou Tayovej-Sachsovej choroby.

Tay-Sachs disease is a rare autosomal recessive disorder caused by β-hexosaminidase A (HexA) enzyme deficiency. There is accumulation of GM2 gangliosides in neuronal lysosomes, which potentiates their toxic effect, thus inducing gradual neurodegeneration. The exact mechanism triggering neuronal death is still unknown. Due to the preserved residual HexA enzyme activity, the adult form of the disease tends to have a milder course than the infantile form. The clinical presentation is non-specific; hence, the disease is significantly underdiagnosed. Our video case report presents a 49-year-old patient with a genetically confirmed diagnosis of adult Tay-Sachs disease.

• MeSH
• cerebelární ataxie MeSH
• lidé středního věku MeSH
• lidé MeSH
• Tay-Sachsova nemoc * diagnóza   terapie   MeSH
• Check Tag
• lidé středního věku MeSH
• lidé MeSH
• mužské pohlaví MeSH
• Publikační typ
• kazuistiky MeSH

PURPOSE: Germline missense variants of unknown significance in cancer-related genes are increasingly being identified with the expanding use of next-generation sequencing. The ataxia telangiectasia-mutated (ATM) gene on chromosome 11 has more than 1,000 germline missense variants of unknown significance and is a tumor suppressor. We aimed to determine if rare germline ATM variants are more frequent in chronic lymphocytic leukemia (CLL) compared with other hematologic malignancies and if they influence the clinical characteristics of CLL. METHODS: We identified 3,128 patients (including 825 patients with CLL) in our hematologic malignancy clinic who had received clinical-grade sequencing of the entire coding region of ATM. We ascertained the comparative frequencies of germline ATM variants in categories of hematologic neoplasms, and, in patients with CLL, we determined whether these variants affected CLL-associated characteristics such as somatic 11q deletion. RESULTS: Rare germline ATM variants are present in 24% of patients with CLL, significantly greater than that in patients with other lymphoid malignancies (16% prevalence), myeloid disease (15%), or no hematologic neoplasm (14%). Patients with CLL with germline ATM variants are younger at diagnosis and twice as likely to have 11q deletion. The ATM variant p.L2307F is present in 3% of patients with CLL, is associated with a three-fold increase in rates of somatic 11q deletion, and is a hypomorph in cell-based assays. CONCLUSION: Germline ATM variants cluster within CLL and affect the phenotype of CLL that develops, implying that some of these variants (such as ATM p.L2307F) have functional significance and should not be ignored. Further studies are needed to determine whether these variants affect the response to therapy or account for some of the inherited risk of CLL.

• MeSH
• ATM protein * genetika   MeSH
• chronická lymfatická leukemie * farmakoterapie   MeSH
• lidé MeSH
• mutace MeSH
• nádorové supresorové proteiny genetika   MeSH
• protein-serin-threoninkinasy genetika   terapeutické užití   MeSH
• proteiny buněčného cyklu genetika   MeSH
• teleangiektatická ataxie MeSH
• Check Tag
• lidé MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH
• Research Support, N.I.H., Extramural MeSH

Epizodické ataxie tvoria skupinu geneticky podmienených alebo získaných ochorení prejavujúcich sa epizodickými atakmi cerebelárnej dysfunkcie, ktoré tiež môžu byť sprevádzané rozličnými ďalšími príznakmi. Primárne epizodické ataxie, ktoré tvoria väčšinu prípadov, vznikajú v mladšom veku a sú charakterizované rozličnou frekvenciou a trvaním atakov, variabilnými interiktálnymi prejavmi a odpoveďou na acetazolamid (epizodické ataxie typ 1-9). Získané epizodické ataxie sa manifestujú väčšinou v neskoršom veku, a to krátko trvajúcimi atakmi ataxie a ďalšími prejavmi samotného ochorenia (roztrúsená skleróza a iné). V tomto prehľadovom článku prinášame didaktický prehľad a stručný diagnostický algoritmus epizodických ataxií pre potreby klinickej praxe.

Episodic ataxias encompass a group of genetic or acquired conditions with episodic attacks of the cerebellar dysfunction, which may be associated with another various symptoms. Primary episodic ataxias are mainly young-onset. They are characterized by various frequency and duration of the attacks, and variable interictal features and response to acetazolamide (episodic ataxias type 1-9). Acquired episodic ataxias are usually late-onset and manifested by short lasting attacks and other features of underlying condition (multiple sclerosis and others). In this article, we provide a didactive overview and a brief diagnostic algorithm of episodic ataxias suitable for clinical praxis.

• Klíčová slova
• epizodické ataxie,
• MeSH
• ataxie * diagnóza   etiologie   genetika   klasifikace   MeSH
• cerebelární ataxie * diagnóza   etiologie   genetika   klasifikace   MeSH
• diferenciální diagnóza MeSH
• geny MeSH
• lidé MeSH
• mutace MeSH
• Check Tag
• lidé MeSH
• Publikační typ
• přehledy MeSH

PURPOSE: ATP2B2 encodes the variant-constrained plasma-membrane calcium-transporting ATPase-2, expressed in sensory ear cells and specialized neurons. ATP2B2/Atp2b2 variants were previously linked to isolated hearing loss in patients and neurodevelopmental deficits with ataxia in mice. We aimed to establish the association between ATP2B2 and human neurological disorders. METHODS: Multinational case recruitment, scrutiny of trio-based genomics data, in silico analyses, and functional variant characterization were performed. RESULTS: We assembled 7 individuals harboring rare, predicted deleterious heterozygous ATP2B2 variants. The alleles comprised 5 missense substitutions that affected evolutionarily conserved sites and 2 frameshift variants in the penultimate exon. For 6 variants, a de novo status was confirmed. Unlike described patients with hearing loss, the individuals displayed a spectrum of neurological abnormalities, ranging from ataxia with dystonic features to complex neurodevelopmental manifestations with intellectual disability, autism, and seizures. Two cases with recurrent amino-acid variation showed distinctive overlap with cerebellar atrophy-associated ataxia and epilepsy. In cell-based studies, all variants caused significant alterations in cytosolic calcium handling with both loss- and gain-of-function effects. CONCLUSION: Presentations in our series recapitulate key phenotypic aspects of Atp2b2-mouse models and underline the importance of precise calcium regulation for neurodevelopment and cerebellar function. Our study documents a role for ATP2B2 variants in causing heterogeneous neurodevelopmental and movement-disorder syndromes.

• MeSH
• ATPasy přenášející vápník přes plazmatickou membránu MeSH
• behaviorální symptomy MeSH
• cerebelární ataxie * genetika   MeSH
• dystonie * genetika   MeSH
• fenotyp MeSH
• lidé MeSH
• mentální retardace * genetika   MeSH
• myši MeSH
• nedoslýchavost * MeSH
• neurovývojové poruchy * genetika   MeSH
• vápník MeSH
• záchvaty genetika   MeSH
• zvířata MeSH
• Check Tag
• lidé MeSH
• myši MeSH
• zvířata MeSH
• Publikační typ
• časopisecké články MeSH