Publications by authors named "Karen Morrison"

Article Synopsis
  • Repeat expansions in the C9orf72 gene are a leading genetic cause of ALS and frontotemporal dementia, but understanding how this mutation causes neuron death is still unclear, complicating the search for effective therapies.
  • Researchers analyzed data from over 41,000 ALS and healthy samples to identify potential treatments, discovering that acamprosate, a drug used for other conditions, might be repurposed for C9orf72-related diseases.
  • Their findings demonstrated that acamprosate has neuroprotective properties in cell models and works similarly well as the current treatment, riluzole, showing the potential of using genomic data to find new drug applications.
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  • The study explores how copy number variations (CNVs) affect the development of Parkinson's disease (PD), aiming to identify new genetic mechanisms linked to sporadic cases of the disease.
  • Utilizing data from over 11,000 PD patients and nearly 9,000 controls, the researchers discovered 14 significant CNV loci associated with PD, including various gene duplications and deletions.
  • The research highlights a higher prevalence of CNVs in specific PD-related genes among patients and suggests that certain CNVs, especially those involving the gene, may lead to earlier onset of the disease in early-onset PD cases.
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  • The study investigates the relationship between body mass index (BMI) and Parkinson's disease (PD) using a method called Mendelian randomization to determine if higher genetically predicted BMI is linked to a lower incidence of PD.
  • Researchers analyzed genetic data from large groups of individuals, including over 800,000 for BMI and nearly 29,000 for PD, focusing on factors like age, disease duration, and gender to examine the associations.
  • Results indicated an inverse relationship between genetically predicted BMI and PD, particularly among younger participants and women, suggesting that lower BMI may be associated with a higher risk of developing Parkinson's disease.
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Objective: Neurofilament heavy-chain gene (NEFH) variants are associated with multiple neurodegenerative diseases, however, their relationship with ALS has not been robustly explored. Still, NEFH is commonly included in genetic screening panels worldwide. We therefore aimed to determine if NEFH variants modify ALS risk.

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Boron neutron capture therapy (BNCT) is a re-emerging binary cellular level cancer intervention that occurs through the interaction of a cancer-specific boron (B) drug and neutrons. We created a new B drug, 3-borono-l-tyrosine (BTS), that improves on the characteristics of the main historical BNCT drug 4-borono-l-phenylalanine (BPA). BTS has up to 4 times greater uptake in vitro than BPA and increased cellular retention.

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Neurofilament levels are elevated in many neurodegenerative diseases and have shown promise as diagnostic and prognostic biomarkers in Amyotrophic Lateral Sclerosis (ALS), the most common form of Motor Neuron Disease (MND). This study assesses serum neurofilament light (NFL) and neurofilament heavy (NFH) chain concentrations in patients with ALS, other variants of motor neuron disease such as Progressive Muscular Atrophy (PMA) and Primary Lateral Sclerosis (PLS), and a range of other neurological diseases. It aims to evaluate the use of NFL and NFH to differentiate these conditions and for the prognosis of MND disease progression.

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Article Synopsis
  • The text discusses the increasing gene testing for amyotrophic lateral sclerosis (ALS), particularly for sporadic ALS (sALS), highlighting a lack of large studies on genetic variations associated with the disease.
  • It describes a research study that analyzed genetic data from over 6,000 sALS patients and over 2,400 controls to characterize genetic variability in 90 ALS-related genes using established criteria for interpretation.
  • The findings revealed that while some pathogenic variants were identified, a significant portion of the sALS patients had no detectable genetic clues, indicating the complexity of the genetic landscape of the disease.*
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Caveolin-1 and Caveolin-2 (CAV1 and CAV2) are proteins associated with intercellular neurotrophic signalling. There is converging evidence that CAV1 and CAV2 (CAV1/2) genes have a role in amyotrophic lateral sclerosis (ALS). Disease-associated variants have been identified within CAV1/2 enhancers, which reduce gene expression and lead to disruption of membrane lipid rafts.

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  • Humans appear more prone to neurodegeneration than similarly aged primates, and it's unclear if this trait is unique to modern humans or shared with other hominids.
  • The study explored the potential impact of Neanderthal DNA on neurodegenerative disorders and examined the role of natural selection on genetic variants linked to these diseases using advanced statistical methods.
  • Findings indicated that there is no significant evidence that Neanderthal DNA or positively-selected genetic variants contribute to the genetic risk of Alzheimer's, ALS, or Parkinson's disease, helping to clarify the evolutionary background of these disorders in modern humans.
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  • Epidemiological studies have shown mixed results regarding the link between Parkinson's disease (PD) and various cancers, primarily due to methodological challenges.
  • This research aimed to explore the genetic correlation between PD and different cancers using data from large genome-wide association studies (GWASs) involving thousands of participants, particularly those of European ancestry.
  • Findings revealed a positive genetic correlation between PD and melanoma as well as prostate cancer, while showing inverse associations between PD and ovarian cancer, indicating complex genetic interactions between these diseases.
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Amyotrophic Lateral Sclerosis is a progressive neurodegenerative disease and is the most common adult motor neuron disease. The disease pathogenesis is complex with the perturbation of multiple pathways proposed, including mitochondrial dysfunction, RNA processing, glutamate excitotoxicity, endoplasmic reticulum stress, protein homeostasis and endosomal transport/extracellular vesicle (EV) secretion. EVs are nanoscopic membrane-bound particles that are released from cells, involved in the intercellular communication of proteins, lipids and genetic material, and there is increasing evidence of their role in ALS.

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Article Synopsis
  • - Amyotrophic lateral sclerosis (ALS) is a rapidly progressive neurodegenerative disease marked by the loss of motor neurons, often leading to death from respiratory failure within 3 to 5 years, with a significant genetic component influencing its risk.
  • - A study analyzed telomere length using genetic data from 6,195 ALS patients and controls, revealing that individuals with ALS had 20% longer telomeres compared to controls after adjusting for age and sex, and this finding was validated using brain samples.
  • - Interestingly, shorter telomeres were associated with a 10% increase in median survival among ALS patients, suggesting that telomere length may play a role in the disease's progression and overall survival chances.
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Introduction/aims: Risdiplam is the newest available treatment for patients with spinal muscular atrophy (SMA). There is little information on its use in adults. We present the clinical experience of adults with SMA treated with risdiplam through the Early Access to Medicines Scheme (EAMS) in Northern Ireland.

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Amyotrophic Lateral Sclerosis (ALS), Spinal Bulbar Muscular Atrophy (SBMA), and Spinal Muscular Atrophy (SMA) are motor neuron diseases (MNDs) characterised by progressive motor neuron degeneration, weakness and muscular atrophy. Lipid dysregulation is well recognised in each of these conditions and occurs prior to neurodegeneration. Several lipid markers have been shown to predict prognosis in ALS.

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Article Synopsis
  • - This study investigates the genetic factors influencing the age at onset (AAO) of Parkinson's disease (PD), aiming to address the inconsistencies in previous research and validate findings through a meta-analysis of diverse populations.
  • - The meta-analysis combined data from the COURAGE-PD Consortium, which included over 8,500 patients primarily of European origin, and the International Parkinson Disease Genomics Consortium, reaching a total of nearly 26,000 participants.
  • - The research confirmed a known genetic variant associated with PD AAO and discovered two genome-wide significant signals on chromosome 4, contributing new insights into the genetic basis of the disease's onset.
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Article Synopsis
  • Two contrasting studies previously examined the link between the HLA-DRB1 gene and smoking concerning Parkinson's disease (PD), leading to varying conclusions.
  • This research aimed to replicate those findings by analyzing genetic data from over 12,000 PD cases and nearly 9,500 controls, focusing on specific genetic variants related to smoking.
  • The results indicated that a specific variant in the HLA-DRB1 gene (valine at position 11) was significantly associated with PD, revealing an inverse relationship between smoking initiation and PD only in individuals lacking this variant, which invites further investigation into the underlying mechanisms.
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Article Synopsis
  • Amyotrophic lateral sclerosis (ALS) is a deadly neurodegenerative disease with a significant genetic component, and changes in DNA methylation can provide insights into its progression and risk factors.* -
  • A large study analyzed blood samples from nearly 10,000 individuals, identifying 45 specific DNA methylation changes linked to 42 genes, which are involved in metabolism, cholesterol production, and immune response.* -
  • The research found that lifestyle factors like cholesterol levels, body mass index, and alcohol consumption are independently linked to ALS, and certain DNA methylation patterns could help predict patient survival and guide future treatments.*
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There is a strong genetic contribution to Amyotrophic lateral sclerosis (ALS) risk, with heritability estimates of up to 60%. Both Mendelian and small effect variants have been identified, but in common with other conditions, such variants only explain a little of the heritability. Genomic structural variation might account for some of this otherwise unexplained heritability.

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  • Previous studies suggested that dairy intake may increase the risk of Parkinson's disease (PD), especially in men, but the nature of this relationship was unclear.
  • This research used genetic data to investigate the link between dairy consumption and PD through a method called Mendelian randomization, involving nearly 10,000 patients and 8,000 controls.
  • The results indicated that genetically predicted higher dairy intake is associated with an increased risk of PD, particularly in men, providing evidence for a possible causal relationship.
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Rationale: Dextro-transposition of the great arteries (D-TGA) is a severe congenital heart defect which affects approximately 1 in 4,000 live births. While there are several reports of D-TGA patients with rare variants in individual genes, the majority of D-TGA cases remain genetically elusive. Familial recurrence patterns and the observation that most cases with D-TGA are sporadic suggest a polygenic inheritance for the disorder, yet this remains unexplored.

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Amyotrophic lateral sclerosis (ALS) is a fatal neurodegenerative disease with a lifetime risk of one in 350 people and an unmet need for disease-modifying therapies. We conducted a cross-ancestry genome-wide association study (GWAS) including 29,612 patients with ALS and 122,656 controls, which identified 15 risk loci. When combined with 8,953 individuals with whole-genome sequencing (6,538 patients, 2,415 controls) and a large cortex-derived expression quantitative trait locus (eQTL) dataset (MetaBrain), analyses revealed locus-specific genetic architectures in which we prioritized genes either through rare variants, short tandem repeats or regulatory effects.

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Background And Purpose: This study evaluates the incidence, prevalence and survival trends of motor neurone disease (MND) in Northern Ireland from 2015 to 2019.

Methods: A capture-recapture analysis was performed using five independent data sources. Incidence and prevalence rates were standardized to the European Standard Population.

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Article Synopsis
  • The study investigates how lifestyle factors like smoking, alcohol, and coffee consumption relate to Parkinson's disease (PD), using a genetic approach to avoid potential biases in causation.* -
  • Findings indicate that smoking is significantly associated with a lower risk of developing PD, while no such associations were found for alcohol or coffee consumption, though there is a suggestion that genetic vulnerability to PD might increase alcohol drinking.* -
  • The research concludes that the protective effect of smoking on PD is likely genuine and not influenced by reverse causation or other biases; however, the data on alcohol and coffee remains inconclusive due to limited power.*
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Importance: Juvenile amyotrophic lateral sclerosis (ALS) is a rare form of ALS characterized by age of symptom onset less than 25 years and a variable presentation.

Objective: To identify the genetic variants associated with juvenile ALS.

Design, Setting, And Participants: In this multicenter family-based genetic study, trio whole-exome sequencing was performed to identify the disease-associated gene in a case series of unrelated patients diagnosed with juvenile ALS and severe growth retardation.

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