Publications by authors named "Christopher Hahn"

Background: The transcription factor (erythroblast transformation-specific-related gene) has been identified as a key regulator of vascular function by suppressing inflammation in endothelial cells (ECs). Dysregulation of due to genetic risk variants is linked to chronic inflammation in conditions such as atherosclerosis and aortic aneurysms.

Case Presentation: This research work investigates the role of the gene in the development of a systemic arterial aneurysm manifestation.

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When investigating whether a variant identified by diagnostic genetic testing is causal for disease, applied genetics professionals evaluate all available evidence to assign a clinical classification. Functional assays of higher and higher throughput are increasingly being generated and, when appropriate, can provide strong functional evidence for or against pathogenicity in variant classification. Despite functional assay data representing unprecedented value for genomic diagnostics, challenges remain around the application of functional evidence in variant curation.

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Background: The diagnosis and management of amyloidosis requires strong coordination among various teams and a multidisciplinary approach which is essential for providing the diagnostic tools needed for patients with organ amyloid deposition.

Methods: In this study, we reviewed the referral patterns to the cardiac and hematology amyloid clinics since the inception of the Amyloidosis Program of Calgary (APC) in 2019. The APC was established to facilitate the diagnosis and treatment of amyloidosis.

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The World Health Organization (WHO-5) and International Consensus Classification (ICC) acknowledge the poor prognosis of TP53-mutated (TP53) myeloid neoplasm (MN). However, there are substantial differences between the two classifications that may lead to under- or overestimation of the prognostic risk. We retrospectively applied WHO-5 and ICC to 603 MN cases harboring TP53 (variant allele frequency, VAF ≥ 2%).

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In-situ and operando techniques in heterogeneous electrocatalysis are a powerful tool used to elucidate reaction mechanisms. Ultimately, they are key in determining concrete links between a catalyst's physical/electronic structure and its activity en route to designing next-generation systems. To this end, the exact execution and interpretation of these lines of experiments is critical as this determines the strength of conclusions that can be drawn and what uncertainties remain.

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This retrospective analysis aimed to provide evidence-based risk stratification of TP53-mutated (TP53mut) myeloid neoplasms (MNs). Of 580 MNs harboring TP53mut with variant allele frequency (VAF) ≥2%, 219 (37.8%), 194 (33.

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Objectives: Patients with refractory myasthenia gravis (MG) have few treatment options. Autologous hematopoietic stem cell transplantation (HSCT) has been used to treat immune diseases; however, its use in the treatment of MG is not broadly considered. Our objective is to report on the efficacy and safety of HSCT in refractory MG.

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Surface oxidation/reduction processes, driven by varying electrochemical potentials, can substantially impact catalyst effectiveness and, consequently, electrolyzer performance. This study combines theoretical and experimental approaches to explore the surface redox behavior of nickel oxides, which are cost-effective and efficient catalysts for many electrochemical reactions. Surface Pourbaix diagrams for three different phases of nickel oxides, i.

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To determine if a variant identified by diagnostic genetic testing is causal for disease, applied genetics professionals evaluate all available evidence to assign a clinical classification. Experimental assay data can provide strong functional evidence for or against pathogenicity in variant classification, but appears to be underutilised. We surveyed genetic diagnostic professionals in Australasia to assess their application of functional evidence in clinical practice.

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Background: In the aftermath of the World Trade Center (WTC) attack on 11 September 2001, rescue and recovery workers faced hazardous conditions and toxic agents. Prior research linked these exposures to adverse health effects, but mainly examined individual factors, overlooking complex mixture effects.

Methods: This study applies an exposomic approach encompassing the totality of responders' experience, defined as the WTC exposome.

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Article Synopsis
  • Therapy-related myeloid neoplasm (t-MN) is a severe blood cancer linked to previous cytotoxic treatments and has a poor prognosis due to its aggressive behavior and treatment resistance.
  • Recent research has shifted understanding from just genomic changes in blood stem cells to include interactions between genetic predispositions and the aging bone marrow environment.
  • Recognizing risk factors for t-MN can help healthcare professionals better predict and potentially prevent its occurrence, leading to improved screening and treatment strategies for high-risk patients.
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Epidemiological evidence of familial predispositions to myeloid malignancies and myeloproliferative neoplasms (MPN) has long been recognised, but recent studies have added to knowledge of specific germline variants in multiple genes that contribute to the familial risk. These variants may be common risk alleles in the general population but have low penetrance and cause sporadic MPN, such as the JAK2 46/1 haplotype, the variant most strongly associated with MPN. Association studies are increasingly identifying other MPN susceptibility genes such as TERT, MECOM, and SH2B3, while some common variants in DDX41 and RUNX1 appear to lead to a spectrum of myeloid malignancies.

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Background: Autoimmune encephalidities (AIE) are becoming an increasingly recognized cause of encephalitis. While diagnosis and acute management are well described, information on long-term management and outcomes is limited. Given this, we reviewed 5 years of AIE patients, reporting on chronic management, relapse incidence and possible relapse predictors.

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Experiments and theory are combined to search for catalyst activity and stability descriptors for the direct reactive capture and conversion (RCC) of CO in ammonia capture solutions using Cu, Ag, Au, Sn, and Ti electrodes. Two major phenomena emerge in RCC that are not predominant in the electrochemical CO reduction (COR) reaction, namely, the rapid corrosion and restructuring of the catalyst in the presence of the CO-ammonia adducts and the promotion of the competing hydrogen evolution reaction (HER). The prevalence of HER in RCC is correlated to the electrostatic attraction of the protonated amine to the electrode and the repulsion of the captured CO, using the potential of zero charge (PZC).

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Article Synopsis
  • The genomics era has led to the identification of the ERG gene as a new autosomal dominant predisposition factor for bone marrow failure (BMF) and hematological malignancies (HM), crucial for blood cell development and function.
  • Research found several rare ERG variants associated with thrombocytopenia and various forms of HM, showing onset typically before age 40.
  • Functional studies indicated that many ERG variants disrupt its role as a transcription factor, leading to ineffective blood cell production, with implications for clinical diagnosis and treatment strategies for affected patients and families.
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Article Synopsis
  • * The development of electrified processes utilizing captured CO aims to eliminate traditional methods of gas compression and storage, addressing both environmental and economic concerns.
  • * This review examines the tuning of ILs and DESs for reactive capture and conversion, focusing on their mechanisms for CO chemisorption and electroreduction, as well as their bulk and interfacial properties related to the process.
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High prevalence of IDH mutations in seronegative rheumatoid arthritis (RA) with myeloid neoplasm, elevated 2-hydroxyglutarate, dysregulated innate immunity, and proinflammatory microenvironment suggests causative association between IDH mutations and seronegative RA. Our findings merit investigation of IDH inhibitors as therapeutics for seronegative IDH-mutated RA.

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Electrochemical CO reduction on Cu is a promising approach to produce value-added chemicals using renewable feedstocks, yet various Cu preparations have led to differences in activity and selectivity toward single and multicarbon products. Here, we find, surprisingly, that the effective catalytic activity toward ethylene improves when there is a larger fraction of less active sites acting as reservoirs of *CO on the surface of Cu nanoparticle electrocatalysts. In an adaptation of chemical transient kinetics to electrocatalysis, we measure the dynamic response of a gas diffusion electrode (GDE) cell when the feed gas is abruptly switched between Ar (inert) and CO.

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Autoimmune encephalitis is increasingly recognized as a neurologic cause of acute mental status changes with similar prevalence to infectious encephalitis. Despite rising awareness, approaches to diagnosis remain inconsistent and evidence for optimal treatment is limited. The following Canadian guidelines represent a consensus and evidence (where available) based approach to both the diagnosis and treatment of adult patients with autoimmune encephalitis.

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In the aftermath of the World Trade Center (WTC) attack, rescue and recovery workers faced hazardous conditions and toxic agents. Prior research linked these exposures to adverse health effects, but mainly examined individual factors, overlooking complex mixture effects. This study applies an exposomic approach encompassing the totality of responders' experience, defined as the WTC exposome.

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