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Open research questions in Genetic Neurodegenerative Diseases

29 unresolved questions extracted from the limitations and future-work sections of 180 Genetic Neurodegenerative Diseases papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • Nuclease FAN1 and mismatch repair protein MLH1 regulate repeat expansion through direct interaction, but the underlying structural basis remains unclear.

    Structural insights into the MLH1–FAN1 interaction reveal an uncharacterized binding interface on MLH1 · 2026 · DOI

  • Abstract Purpose Neuropathological and biomarker evidence implicates tau dysregulation as a downstream component of Huntington’s disease (HD) pathobiology, yet its in vivo distribution has not been characterised using second-generation tau-PET tracers.

    Stage-dependent tau-PET signatures in Huntington’s disease revealed by [¹⁸F]PI-2620 · 2026 · DOI

  • Expanded short tandem repeats contribute to a broad spectrum of neurodegenerative diseases, yet their roles in Parkinsons disease (PD) and parkinsonism remain incompletely characterized, especially across diverse ancestries.

    Repeat expansions in Parkinson's disease and parkinsonism across ancestries: insights from a global genetic cohort · 2026 · DOI

  • Polyglycine (polyG) proteins translated from expanded GGC trinucleotide repeats are implicated in a growing group of neuromuscular degenerative disorders characterized by intranuclear inclusions, yet the pathogenic importance of aggregate localization and the mechanisms underlying polyG-induced neurodegeneration remain unclear.

    Intranuclear polyglycine aggregation drives neurodegeneration through epigenetic repression of chromatin accessibility and transcription · 2026 · DOI

  • This review provides an overview of the major neuronal pathogenic mechanisms of HD. The involvement of peripheral tissues and the non-neuronal pathogenesis of HD fall out- side the scope of the current discussion. Furthermore, this review does not discuss the various animal models of HD.

    Molecular mechanisms, clinical phenotypes, and advances in Huntington’s disease therapeutics · 2026 · DOI

  • Several factors complicated the comparison between studies. Firstly, different measurement methods were used. Secondly, details on data retrieval were often brief or even missing. Additionally, a relatively small number of studies tested the same paradigms and limited single patient data, often impeded data synthesis.

    Quantitative Ocular Motor / Vestibular Assessment in Patients with Spinocerebellar Ataxia Type 3 (SCA3, Machado Joseph Disease) – Systematic Review of the Literature · 2026 · DOI

  • Recruitment through patient advocacy organisations may have introduced participation bias, as respondents are more likely to be proactive, informed, and engaged with specialist services than the broader FA population. This may limit the generalisability of findings and is important to consider when interpreting cross- country comparisons. The fact we don’t have participants in the non-SAC group on Germany prevented us from running any comparison test and stats between SAC and non-SAC groups in this country. The cohort in Germany is small compared to the two other countries and all people recruited living with FA have been to a SAC as part of their care. We also note that once we stratified the UK and Italy cohort by SAC attendance, we have a small group of SAC participants and non-SAC participants in the UK and Italy respectively. Resource use data for Italy and Germany were collected for the preceding 12 months, whereas for the UK they were only collected for the previous 6 months. To make the figures more comparable we multiplied the UK figures by two (16). We acknowledge this might not completely reflect 12 months resource use in the UK; however, we also compared our survey data with data from clinical practice in the two UK specialist ataxia centres and the numbers were broadly consistent.

    Friedreich's ataxia patient pathway in Europe · 2026 · DOI

  • 0.201 0.850 55 37 1.077a 1.021a 1.127a 0.041a 0.623a 0.040b 16 35 44 27.0 ± 12.3 19.7 ± 11.2 23.2 ± 13.7 23.7 ± 9.3 18.0 ± 11.3 29.1 ± 10.3 18.5 ± 10.3 30.3 ± 10.8 18.1 ± 10.6 29.6 ± 10.8 41 < 0.01 45 47 < 0.01 45 54 < 0.01 39 49 < 0.01 43 18.6 ± 10.7 24.9 ± 12.3 24.1 ± 12.2 SARA Score Low (≤ 16) High (> 16) PROM-Ataxia Short Form Low (≤ 22) High (> 22) WEMBWBS Low (≤ 50.5) High (> 50.5) FARS-ADL Low (≤ 12) High (>…

    A Patient-Reported Outcome Measure of Communication Difficulties in Friedreich Ataxia: COMATAX. · 2026 · DOI

  • Although limited to a single observation, these findings raise the possibility that PBMC bioenergetic profiling may represent a potential peripheral indicator of immunometabolic activity during treatment in immune-mediated cerebellar disorders, war- ranting further investigation in larger studies.

    A Case Report of Reversible Mitochondrial Bioenergetic Dysfunction in PBMCs in Anti-GAD65–Associated Cerebellar Ataxia · 2026 · DOI

  • Our scoping review has some limitations. We only searched two electronic databases – PubMed and Google Scholar. Since Google Scholar returned over 9,000 results and the first 500 screened by relevance filter covered suf- ficient relevant studies, this should be adequate for the scope of this review. Nevertheless, we cannot rule out that some studies may have been missed by not includ- ing additional databases. Another limitation arises from methodological inconsistencies in the included studies, where confounders, such as medication, comorbidities or age have not been included in the study statistics and therefore could distort results especially in the phenom- enology of the disease.

    Sex-related differences in Huntington‘s disease: a scoping review · 2026 · DOI

  • Most research has focused on the implications of testing asymptomatic individuals; research on the experience of patients with symptoms of heritable conditions is lacking, leaving an ambiguity about their needs with regard to genetic counseling, whether it involves professional counselors or physicians.

    Diagnostic genetic testing for a fatal illness: the experience of patients with movement disorders · 2009 · DOI

  • Although few studies are available at present, there is converging evidence that multiple measures of pre- and postsynaptic DA biochemistry are (a) highly interrelated, and (b) strongly associated with the cognitive deficits that accompany HD and aging.

    Dopamine and cognitive functioning: Brain imaging findings in Huntington’s disease and normal aging · 2001 · DOI

  • However, how haplotypes around the repeats and CAA interruptions within the repeats are associated with disease phenotypes remains poorly understood.

    Dissecting the relationship between haplotypes around ATXN2 CAG repeats and the number of CAA interruptions by long-read sequencing · 2026 · DOI

  • When participants with worse outcomes exit earlier, this outcome-dependent censoring causes existing estimators to produce contradictory results: for the same cognitive outcome, one estimator suggests improvement while another shows decline.

    SPYCE: A Doubly Robust Estimator for Trials Targeting Early Huntington Disease under Outcome-Dependent Censoring · 2026

  • No clear difference in overall adverse events was observed between intervention and control groups; however, available safety evidence remains limited by imprecision, small sample sizes, and short follow-up durations.

    Evolution of Friedreich’s Ataxia Management Across Established and Emerging Therapies—Systematic Review and Meta-Analysis · 2026 · DOI

  • These findings support a framework in which physiologically grounded digital biomarkers are coupled with general-purpose inference models, potentially enabling scalable assessment in rare neurological diseases where labeled data are limited.

    Physiology-Driven Inference Using Large Language Models Enables Probabilistic Assessment of Huntington’s Disease from Smartphone Eye-Movement Data · 2026 · DOI

  • Background: Artificial intelligence in medicine has largely relied on supervised training of disease-specific models, limiting scalability in conditions where labeled data are scarce.

    Physiology-Driven Inference Using Large Language Models Enables Probabilistic Assessment of Huntington’s Disease from Smartphone Eye-Movement Data · 2026 · DOI

  • Strength and limitations of this study This study employs a structured methodology integrating imaging assessment of swallowing-related muscle morphom- etry with biomechanical, clinical, and patient-centred outcomes.

    A multidimensional profile of dysphagia in myotonic dystrophy type 1: a cross-sectional study protocol · 2026 · DOI

  • The interpretability of gait analysis studies in people with rare diseases, such as those with primary hereditary cerebellar ataxia (pwCA), is frequently limited by the small sample sizes and unbalanced datasets.

    Optimizing Rare Disease Gait Classification through Data Balancing and Generative AI: Insights from Hereditary Cerebellar Ataxia · 2024 · DOI

  • The authors conclude that combined therapy of a low dose of deferiprone with idebenone is relatively safe, might improve neurological function, and seems to improve heart hypertrophy, warranting further studies.

    Clinical Experience With Deferiprone Treatment for Friedreich Ataxia · 2016 · DOI

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29 open questions have been extracted from the limitations and future-work passages of 180 Genetic Neurodegenerative Diseases papers in our library. Each one below links back to the study that raised it, so you can read the original claim in context.

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