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  1. Article: A model for the dynamics of expanded CAG repeat alleles:

    Sena, Lucas Schenatto / Lemes, Renan Barbosa / Furtado, Gabriel Vasata / Saraiva-Pereira, Maria Luiza / Jardim, Laura Bannach

    Frontiers in genetics

    2023  Volume 14, Page(s) 1296614

    Abstract: Background: ...

    Abstract Background:
    Language English
    Publishing date 2023-11-14
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2606823-0
    ISSN 1664-8021
    ISSN 1664-8021
    DOI 10.3389/fgene.2023.1296614
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Variants in Genes of Calpain System as Modifiers of Spinocerebellar Ataxia Type 3 Phenotype.

    Martins, Ana Carolina / Rieck, Mariana / Leotti, Vanessa Bielefeldt / Saraiva-Pereira, Maria Luiza / Jardim, Laura Bannach

    Journal of molecular neuroscience : MN

    2021  Volume 71, Issue 9, Page(s) 1906–1913

    Abstract: Calpain-mediated proteolysis has been proposed to modulate the pathogenesis of spinocerebellar ataxia type 3, also known as Machado-Joseph disease (SCA3/MJD), a disorder due to a CAG repeat expansion (CAGexp) at ATXN3. We aimed to investigate if single- ... ...

    Abstract Calpain-mediated proteolysis has been proposed to modulate the pathogenesis of spinocerebellar ataxia type 3, also known as Machado-Joseph disease (SCA3/MJD), a disorder due to a CAG repeat expansion (CAGexp) at ATXN3. We aimed to investigate if single-nucleotide polymorphisms (SNPs) at calpain gene CAPN2 and at calpastatin gene CAST modulate the age at onset (AO) and disease progression in SCA3/MJD. A total of 287 SCA3/MJD symptomatic subjects (151 families) were included. AO was analyzed and controlled by the CAG repeat length of expanded allele and family. Candidate polymorphisms were chosen based on the literature and on a priori criteria. The CAG repeat length and SNPs were genotyped according to standard methods. AO of carriers of AA and AG + GG
    MeSH term(s) Adolescent ; Adult ; Calcium-Binding Proteins/genetics ; Calpain/genetics ; Female ; Genes, Modifier ; Heterozygote ; Humans ; Machado-Joseph Disease/genetics ; Machado-Joseph Disease/pathology ; Male ; Middle Aged ; Mutation ; Pedigree ; Phenotype ; Polymorphism, Single Nucleotide ; Trinucleotide Repeat Expansion
    Chemical Substances CAST protein, human ; Calcium-Binding Proteins ; Calpain (EC 3.4.22.-) ; CAPN2 protein, human (EC 3.4.22.53)
    Language English
    Publishing date 2021-06-30
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1043392-2
    ISSN 1559-1166 ; 0895-8696
    ISSN (online) 1559-1166
    ISSN 0895-8696
    DOI 10.1007/s12031-021-01877-9
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Diagnostic Delay of Hereditary Ataxias in Brazil: the Case of Machado-Joseph Disease.

    Dos Santos Pinheiro, Jordânia / Sena, Lucas Schenatto / Donis, Karina Carvalho / Furtado, Gabriel Vasata / Saraiva-Pereira, Maria Luiza / Jardim, Laura Bannach

    Cerebellum (London, England)

    2022  Volume 22, Issue 3, Page(s) 348–354

    Abstract: Background: Spinocerebellar ataxia type 3/Machado-Joseph disease (SCA3/MJD) is a rare disease with diagnosis offered by the Unified Health System in Brazil. Our aim was to investigate the diagnostic delay in an interval of 23 years in a public ... ...

    Abstract Background: Spinocerebellar ataxia type 3/Machado-Joseph disease (SCA3/MJD) is a rare disease with diagnosis offered by the Unified Health System in Brazil. Our aim was to investigate the diagnostic delay in an interval of 23 years in a public university hospital, and some potentially determining factors.
    Methods: A retrospective review of the medical records of subjects identified at our institution between 1999 and 2017 was carried out, including residents of Rio Grande do Sul. The diagnostic delay was equivalent to the difference between age at onset of symptoms and age at molecular diagnosis. Calendar years, educational level, sex, distance between the household and the clinics, age and being the index case were studied as modifying factors.
    Results: SCA3/MJD had a median diagnostic delay of 5 years. Index cases had delays of 6 versus 4 years (p<0.001) for subsequent family members. Delay correlated with age (rho=0.346, p<0.001), but not with age at disease onset (rho=0.005, p=0.91). No change was observed with the level of education of individuals or with the distance between household and hospital from 1999 to 2017.
    Discussion: The diagnostic delay of SCA3/MJD is high in our region, where its occurrence has been reported for years. Failure to change the delay over the years suggests ineffective dissemination to the population, but a smaller lag among younger people can portray the effect of digital inclusion.
    MeSH term(s) Humans ; Machado-Joseph Disease ; Delayed Diagnosis ; Brazil ; Spinocerebellar Degenerations ; Spinocerebellar Ataxias
    Language English
    Publishing date 2022-04-14
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2112586-7
    ISSN 1473-4230 ; 1473-4222
    ISSN (online) 1473-4230
    ISSN 1473-4222
    DOI 10.1007/s12311-022-01404-5
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Selective forces acting on spinocerebellar ataxia type 3/Machado-Joseph disease recurrency: A systematic review and meta-analysis.

    Sena, Lucas Schenatto / Dos Santos Pinheiro, Jordânia / Saraiva-Pereira, Maria Luiza / Jardim, Laura Bannach

    Clinical genetics

    2020  Volume 99, Issue 3, Page(s) 347–358

    Abstract: Spinocerebellar ataxia type 3/Machado-Joseph disease (SCA3/MJD) is a dominant neurodegenerative disease caused by the expansion of a CAG repeat tract in ATXN3. Anticipation and worsening of clinical picture in subsequent generations were repeatedly ... ...

    Abstract Spinocerebellar ataxia type 3/Machado-Joseph disease (SCA3/MJD) is a dominant neurodegenerative disease caused by the expansion of a CAG repeat tract in ATXN3. Anticipation and worsening of clinical picture in subsequent generations were repeatedly reported, but there is no indication that SCA3/MJD frequency is changing. Thus, we performed a systematic review and meta-analysis on phenomena with potential effect on SCA3/MJD recurrency in populations: instability of CAG repeat transmissions, anticipation, fitness, and segregation of alleles. Transmission of the mutant allele was associated with an increase of 1.23 CAG repeats in the next generation, and the average change in age at onset showed an anticipation of 7.75 years per generation; but biased recruitments cannot be ruled out. Affected SCA3/MJD individuals had 45% more children than related controls. Transmissions from SCA3/MJD carriers showed that the expanded allele was segregated in 64% of their children. In contrast, transmissions from normal subjects showed that the minor allele was segregated in 54%. The present meta-analysis concluded that there is a segregation distortion favoring the expanded allele, among children of carriers. Therefore, further studies on transmissions and anticipation phenomena as well as more observations about fertility are required to clarify these selective forces over SCA3/MJD.
    MeSH term(s) Age of Onset ; Alleles ; Ataxin-3/genetics ; Gene Frequency ; Genetic Predisposition to Disease ; Haplotypes ; Heterozygote ; Humans ; Machado-Joseph Disease/epidemiology ; Machado-Joseph Disease/genetics ; Meiosis ; Recurrence ; Trinucleotide Repeat Expansion
    Chemical Substances Ataxin-3 (EC 3.4.19.12)
    Language English
    Publishing date 2020-12-02
    Publishing country Denmark
    Document type Journal Article ; Meta-Analysis ; Research Support, Non-U.S. Gov't ; Systematic Review
    ZDB-ID 221209-2
    ISSN 1399-0004 ; 0009-9163
    ISSN (online) 1399-0004
    ISSN 0009-9163
    DOI 10.1111/cge.13888
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Spinocerebellar ataxia type 2 from an evolutionary perspective: Systematic review and meta-analysis.

    Sena, Lucas Schenatto / Dos Santos Pinheiro, Jordânia / Hasan, Ali / Saraiva-Pereira, Maria Luiza / Jardim, Laura Bannach

    Clinical genetics

    2021  Volume 100, Issue 3, Page(s) 258–267

    Abstract: Dominant diseases due to expanded CAG repeat tracts, such as spinocerebellar ataxia type 2 (SCA2), are prone to anticipation and worsening of clinical picture in subsequent generations. There is insufficient data about selective forces acting on the ... ...

    Abstract Dominant diseases due to expanded CAG repeat tracts, such as spinocerebellar ataxia type 2 (SCA2), are prone to anticipation and worsening of clinical picture in subsequent generations. There is insufficient data about selective forces acting on the maintenance of these diseases in populations. We made a systematic review and meta-analysis on the effect of the CAG length over age at onset, instability of transmissions, anticipation, de novo or sporadic cases, fitness, segregation of alleles, and ancestral haplotypes. The correlation between CAG expanded and age at onset was r
    MeSH term(s) Age of Onset ; Ataxin-2/genetics ; Evolution, Molecular ; Genomic Instability ; Haplotypes ; Humans ; Spinocerebellar Ataxias/genetics ; Trinucleotide Repeat Expansion
    Chemical Substances ATXN2 protein, human ; Ataxin-2
    Language English
    Publishing date 2021-05-27
    Publishing country Denmark
    Document type Journal Article ; Meta-Analysis ; Research Support, Non-U.S. Gov't ; Systematic Review
    ZDB-ID 221209-2
    ISSN 1399-0004 ; 0009-9163
    ISSN (online) 1399-0004
    ISSN 0009-9163
    DOI 10.1111/cge.13978
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Response to ATXN10 Microsatellite Distribution in a Peruvian Amerindian Population.

    Véliz-Otani, Diego / Cubas-Montecino, Diana / Milla-Neyra, Karina / Ashizawa, Tetsuo / Saraiva-Pereira, Maria Luiza / Jardim, Laura Bannach / Cornejo-Olivas, Mario

    Cerebellum (London, England)

    2021  Volume 20, Issue 6, Page(s) 946–947

    MeSH term(s) Ataxin-10/genetics ; Humans ; Microsatellite Repeats ; Peru/epidemiology ; Whites
    Chemical Substances ATXN10 protein, human ; Ataxin-10
    Language English
    Publishing date 2021-03-17
    Publishing country United States
    Document type Letter ; Comment
    ZDB-ID 2112586-7
    ISSN 1473-4230 ; 1473-4222
    ISSN (online) 1473-4230
    ISSN 1473-4222
    DOI 10.1007/s12311-021-01258-3
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: The longitudinal progression of MRI changes in pre-ataxic carriers of SCA3/MJD.

    de Oliveira, Camila Maria / Leotti, Vanessa Bielefeldt / Polita, Sandra / Anes, Mauricio / Cappelli, Amanda Henz / Rocha, Anastacia Guimarães / Ecco, Gabriela / Bolzan, Gabriela / Kersting, Nathalia / Duarte, Juliana Avila / Saraiva-Pereira, Maria-Luiza / Junior, Marcondes Cavalcante França / Rezende, Thiago Junqueira Ribeiro / Jardim, Laura Bannach

    Journal of neurology

    2023  Volume 270, Issue 9, Page(s) 4276–4287

    Abstract: Background: The natural history of magnetic resonance imaging (MRI) in pre-ataxic stages of spinocerebellar ataxia type 3/Machado-Joseph disease (SCA3/MJD) is not well known. We report cross-sectional and longitudinal data obtained at this stage.: ... ...

    Abstract Background: The natural history of magnetic resonance imaging (MRI) in pre-ataxic stages of spinocerebellar ataxia type 3/Machado-Joseph disease (SCA3/MJD) is not well known. We report cross-sectional and longitudinal data obtained at this stage.
    Methods: Baseline (follow-up) observations included 32 (17) pre-ataxic carriers (SARA < 3) and 20 (12) related controls. The mutation length was used to estimate the time to onset (TimeTo) of gait ataxia. Clinical scales and MRIs were performed at baseline and after a median (IQR) of 30 (7) months. Cerebellar volumetries (ACAPULCO), deep gray-matter (T1-Multiatlas), cortical thickness (FreeSurfer), cervical spinal cord area (SCT) and white matter (DTI-Multiatlas) were assessed. Baseline differences between groups were described; variables that presented a p < 0.1 after Bonferroni correction were assessed longitudinally, using TimeTo and study time. For TimeTo strategy, corrections for age, sex and intracranial volume were done with Z-score progression. A significance level of 5% was adopted.
    Results: SCT at C1 level distinguished pre-ataxic carriers from controls. DTI measures of the right inferior cerebellar peduncle (ICP), bilateral middle cerebellar peduncles (MCP) and bilateral medial lemniscus (ML), also distinguished pre-ataxic carriers from controls, and progressed over TimeTo, with effect sizes varying from 0.11 to 0.20, larger than those of the clinical scales. No MRI variable showed progression over study time.
    Discussion: DTI parameters of the right ICP, left MCP and right ML were the best biomarkers for the pre-ataxic stage of SCA3/MJD. TimeTo is an interesting timescale, since it captured the longitudinal worsening of these structures.
    MeSH term(s) Humans ; Machado-Joseph Disease/diagnostic imaging ; Machado-Joseph Disease/genetics ; Cross-Sectional Studies ; Spinocerebellar Ataxias/pathology ; Ataxia ; Magnetic Resonance Imaging
    Language English
    Publishing date 2023-05-16
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 187050-6
    ISSN 1432-1459 ; 0340-5354 ; 0012-1037 ; 0939-1517 ; 1619-800X
    ISSN (online) 1432-1459
    ISSN 0340-5354 ; 0012-1037 ; 0939-1517 ; 1619-800X
    DOI 10.1007/s00415-023-11763-6
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Remote Measurement of Functional Status in Pre-symptomatic and Symptomatic Individuals with Machado-Joseph Disease.

    Miglorini, Elaine Cristina / de Souza, Victor Henrique Ignácio / de Oliveira, Camila Maria / Bolzan, Gabriela / Saraiva-Pereira, Maria Luiza / Leotti, Vanessa Bielefeldt / Jardim, Laura Bannach

    Cerebellum (London, England)

    2022  Volume 22, Issue 3, Page(s) 475–477

    MeSH term(s) Humans ; Machado-Joseph Disease ; Functional Status
    Language English
    Publishing date 2022-03-29
    Publishing country United States
    Document type Letter
    ZDB-ID 2112586-7
    ISSN 1473-4230 ; 1473-4222
    ISSN (online) 1473-4230
    ISSN 1473-4222
    DOI 10.1007/s12311-022-01399-z
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Progression of Clinical and Eye Movement Markers in Preataxic Carriers of Machado-Joseph Disease.

    de Oliveira, Camila Maria / Leotti, Vanessa Bielefeldt / Cappelli, Amanda Henz / Rocha, Anastacia Guimarães / Ecco, Gabriela / Bolzan, Gabriela / Kersting, Nathalia / Saraiva-Pereira, Maria-Luiza / Jardim, Laura Bannach

    Movement disorders : official journal of the Movement Disorder Society

    2022  Volume 38, Issue 1, Page(s) 26–34

    Abstract: Background: Little is known about preclinical stages of Machado-Joseph disease, a polyglutamine disorder characterized by progressive adult-onset ataxia.: Objective: We aimed to describe the longitudinal progression of clinical and oculomotor ... ...

    Abstract Background: Little is known about preclinical stages of Machado-Joseph disease, a polyglutamine disorder characterized by progressive adult-onset ataxia.
    Objective: We aimed to describe the longitudinal progression of clinical and oculomotor variables in the preataxic phase of disease.
    Methods: Carriers and noncarriers were assessed at three visits. Preataxic carriers (Scale for Assessment and Rating of Ataxia score < 3) expected to start ataxia in ≤4 years were considered near onset (PAN). Progressions of ataxic and preataxic carriers, considering status at the end of the study, were described according to the start (or its prediction) of gait ataxia (TimeToAfterOnset) and according to the study time.
    Results: A total of 35 ataxics, 38 preataxics, and 22 noncarriers were included. The "TimeToAfterOnset" timeline showed that Neurological Examination Scale for Spinocerebellar Ataxias (NESSCA; effect size, 0.09), Inventory of Non-Ataxia Symptoms (INAS0.07), and the vestibulo-ocular reflex gain (0.12) progressed in preataxic carriers, and that most slopes accelerate in PAN, turning similar to those of ataxics. In the study time, NESSCA (1.36) and vertical pursuit gain (1.17) significantly worsened in PAN, and 6 of 11 PANs converted to ataxia. For a clinical trial with 80% power and 2-year duration, 57 PANs are needed in each study arm to detect a 50% reduction in the conversion rate.
    Conclusions: NESSCA, INAS, vestibulo-ocular reflex, and vertical pursuit gains significantly worsened in the preataxic phase. The "TimeToAfterOnset" timeline unveiled that slopes of most variables are small in preataxics but increase and reach the ataxic slopes from 4 years before the onset of ataxia. For future trials in preataxic carriers, we recommend recruiting PANs and using the conversion rate as the primary outcome. © 2022 International Parkinson and Movement Disorder Society.
    MeSH term(s) Adult ; Humans ; Machado-Joseph Disease/diagnosis ; Machado-Joseph Disease/genetics ; Eye Movements ; Spinocerebellar Ataxias/diagnosis ; Spinocerebellar Ataxias/genetics ; Heterozygote ; Severity of Illness Index ; Disease Progression
    Language English
    Publishing date 2022-09-21
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 607633-6
    ISSN 1531-8257 ; 0885-3185
    ISSN (online) 1531-8257
    ISSN 0885-3185
    DOI 10.1002/mds.29226
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Friedreich Ataxia: Diagnostic Yield and Minimal Frequency in South Brazil.

    Fussiger, Helena / Saraiva-Pereira, Maria Luiza / Leistner-Segal, Sandra / Jardim, Laura Bannach

    Cerebellum (London, England)

    2018  Volume 18, Issue 1, Page(s) 147–151

    Abstract: Friedreich ataxia (FRDA) is an autosomal recessive disorder due to mutations in the FXN gene. FRDA is characterized by the classical triad of ataxia, absent reflexes, and Babinski sign, but atypical presentations might also occur. Our aims were to ... ...

    Abstract Friedreich ataxia (FRDA) is an autosomal recessive disorder due to mutations in the FXN gene. FRDA is characterized by the classical triad of ataxia, absent reflexes, and Babinski sign, but atypical presentations might also occur. Our aims were to describe the proportion of FRDA diagnoses in suspected families living in Rio Grande do Sul, South Brazil, and to estimate a minimum frequency of symptomatic subjects. Subjects that were evaluated by molecular analysis for FRDA at the Hospital de Clínicas de Porto Alegre were identified in our files. Patients' clinical manifestation and phenotypes were described and compared. The number of FRDA subjects alive in the last 5 years was determined. One hundred fifty-six index cases (families) were submitted to evaluation of GAA repeats at FXN since 1997: 27 were confirmed as FRDA patients. Therefore, the diagnostic yield was 17.3%. Proportion of classical, late onset, and retained reflexes subphenotypes were similar to those described by other studies. A minimum prevalence was estimated as 0.20:100.000 inhabitants. In conclusion, we verified that this FRDA population displayed the usual clinical characteristics, but with a lower period prevalence than those obtained in populations from Europe.
    MeSH term(s) Age of Onset ; Brazil/epidemiology ; Cross-Sectional Studies ; Friedreich Ataxia/diagnosis ; Friedreich Ataxia/epidemiology ; Friedreich Ataxia/genetics ; Humans ; Iron-Binding Proteins/genetics ; Phenotype ; Prevalence ; Trinucleotide Repeat Expansion ; Frataxin
    Chemical Substances Iron-Binding Proteins
    Language English
    Publishing date 2018-06-25
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2112586-7
    ISSN 1473-4230 ; 1473-4222
    ISSN (online) 1473-4230
    ISSN 1473-4222
    DOI 10.1007/s12311-018-0958-x
    Database MEDical Literature Analysis and Retrieval System OnLINE

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