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Huntington Disease l: Introduction01:21

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Huntington disease or HD is a progressive, fatal neurodegenerative disorder inherited in an autosomal dominant pattern.PathophysiologyIt is caused by expansion of the CAG trinucleotide repeat in the HTT gene on chromosome 4 (4p16.3), producing an abnormal huntingtin protein with an expanded polyglutamine tract. This misfolded protein disrupts cellular function, leading to neuronal death. Normal alleles have ≤26 repeats, 27–35 are intermediate (risk of expansion), 36–39 show...
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Parkinson disease (PD) is a progressive neurodegenerative disorder primarily affecting movement, with additional non-motor features. Its pathophysiology involves complex interactions among genetic susceptibility, environmental exposures, and cellular dysfunction, including dopaminergic neuron loss, protein aggregation, and mitochondrial impairment.Selective NeurodegenerationA key feature is the degeneration of dopaminergic neurons in the substantia nigra pars compacta, leading to reduced...
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Alzheimer disease involves structural changes in the brain that begin long before symptoms appear. The most distinctive features are extracellular neuritic plaques and intracellular neurofibrillary tangles.Neuritic plaques form in the cerebral cortex and around blood vessels. These plaques contain a dense core of beta-amyloid (Aβ)—a toxic protein fragment that clumps outside neurons. The core is surrounded by damaged neuronal extensions, as well as reactive astrocytes and...
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Neurodegenerative disorders are progressive diseases that cause irreversible damage and loss to neurons in specific brain areas. Examples of these disorders include Parkinson's disease, Alzheimer's disease, Multiple Sclerosis (MS), and Amyotrophic Lateral Sclerosis (ALS). These disorders share characteristics such as proteinopathies, selective neuronal vulnerability, and a complex interplay between genetic and environmental factors. The primary therapeutic goal for these conditions is...
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Alzheimer's Disease (AD) is a continually advancing neurodegenerative disorder, distinguished by escalating memory loss, cognitive dysfunction, and dementia. The disease unfolds in three stages: preclinical, mild cognitive impairment (MCI), and dementia. Its onset is insidious, and the progression gradual, with the cause not well explained by other disorders.
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Parkinson’s disease is a chronic, progressive neurodegenerative disorder that primarily affects movement. It is characterized by motor symptoms such as resting tremors, muscle rigidity, bradykinesia (slowness of movement), and postural instability. Patients may notice hand tremors at rest, stiffness during movement, or a shuffling gait. In addition to motor features, non-motor symptoms include sleep disturbances, mood and behavioral changes, constipation, and cognitive impairment, all of...
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A Robust Polymerase Chain Reaction-based Assay for Quantifying Cytosine-guanine-guanine Trinucleotide Repeats in Fragile X Mental Retardation-1 Gene
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Emerging topics in FXTAS.

Deborah A Hall1, Rachael C Birch2, Mathieu Anheim3

  • 1Department of Neurological Sciences, Rush University, Chicago, IL, USA.

Journal of Neurodevelopmental Disorders
|February 3, 2015
PubMed
Summary
This summary is machine-generated.

Emerging issues in fragile X-associated tremor/ataxia syndrome (FXTAS) were discussed at a 2013 conference. This summary highlights key findings on FMR1 premutation mechanisms and clinical involvement.

Keywords:
AtaxiaFMR1FXTASFragile XPremutationTremor

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Area of Science:

  • Neurogenetics
  • Neurology
  • Molecular Biology

Background:

  • Fragile X-associated tremor/ataxia syndrome (FXTAS) is a late-onset neurodegenerative disorder.
  • It is associated with the FMR1 gene premutation.
  • FXTAS presents with tremor, ataxia, and cognitive decline.

Purpose of the Study:

  • To summarize emerging issues in FXTAS.
  • To consolidate findings from the First International Conference on the FMR1 Premutation.
  • To highlight basic mechanisms and clinical involvement in FXTAS.

Main Methods:

  • Literature review of conference proceedings.
  • Synthesis of expert discussions and presentations.
  • Identification of key research trends and challenges.

Main Results:

  • Key emerging issues in FXTAS pathogenesis were identified.
  • Advances in understanding FMR1 premutation molecular mechanisms were discussed.
  • Clinical manifestations and diagnostic challenges were highlighted.

Conclusions:

  • Further research is needed to elucidate FXTAS pathophysiology.
  • Improved diagnostic criteria and therapeutic strategies are required.
  • International collaboration is crucial for advancing FXTAS research.