Publications by authors named "Mari Niemi"

Article Synopsis
  • Researchers analyzed ischaemic stroke (IS) cases that occurred within eight days of COVID-19 onset to determine if they have a unique genetic background compared to other stroke types.
  • Using a method called SUPERGNOVA, they identified specific genomic regions related to large artery atherosclerosis (LAA) and cardioembolic stroke (CES) from a cohort of 73 IS-COV patients and 701 control subjects.
  • The study found four genetic loci associated with CES and significant polygenic risk scores for LAA, suggesting IS-COV patients may share genetic traits with these stroke subtypes; more research is needed to see if these traits are specific to viral infection or common in the general population.
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  • Population isolates like Finland provide a unique advantage for genetic research by having concentrated deleterious alleles in low-frequency variants due to historical bottlenecks.
  • The FinnGen study aims to analyze data from 500,000 Finnish individuals, focusing on their genomes and health records, particularly as many participants are older and have disease-related data.
  • From the analysis of 224,737 participants and additional biobank data, researchers discovered 30 new associations and a total of 2,733 significant genetic links across various diseases, highlighting the importance of low-frequency variants in understanding common diseases.
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Objectives: To recontact biobank participants and collect cognitive, behavioural and lifestyle information via a secure online platform.

Design: Biobank-based recontacting pilot study.

Setting: Three Finnish biobanks (Helsinki, Auria, Tampere) recruiting participants from February 2021 to July 2021.

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Given the highly variable clinical phenotype of Coronavirus disease 2019 (COVID-19), a deeper analysis of the host genetic contribution to severe COVID-19 is important to improve our understanding of underlying disease mechanisms. Here, we describe an extended genome-wide association meta-analysis of a well-characterized cohort of 3255 COVID-19 patients with respiratory failure and 12 488 population controls from Italy, Spain, Norway and Germany/Austria, including stratified analyses based on age, sex and disease severity, as well as targeted analyses of chromosome Y haplotypes, the human leukocyte antigen region and the SARS-CoV-2 peptidome. By inversion imputation, we traced a reported association at 17q21.

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Human genetics can inform the biology and epidemiology of coronavirus disease 2019 (COVID-19) by pinpointing causal mechanisms that explain why some individuals become more severely affected by the disease upon infection by the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) virus. Large-scale genetic association studies, encompassing both rare and common genetic variants, have used different study designs and multiple disease phenotype definitions to identify several genomic regions associated with COVID-19. Along with a multitude of follow-up studies, these findings have increased our understanding of disease aetiology and provided routes for management of COVID-19.

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Genome-wide sequencing of human populations has revealed substantial variation among genes in the intensity of purifying selection acting on damaging genetic variants. Although genes under the strongest selective constraint are highly enriched for associations with Mendelian disorders, most of these genes are not associated with disease and therefore the nature of the selection acting on them is not known. Here we show that genetic variants that damage these genes are associated with markedly reduced reproductive success, primarily owing to increased childlessness, with a stronger effect in males than in females.

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BackgroundThere is considerable variability in COVID-19 outcomes among younger adults, and some of this variation may be due to genetic predisposition.MethodsWe combined individual level data from 13,888 COVID-19 patients (n = 7185 hospitalized) from 17 cohorts in 9 countries to assess the association of the major common COVID-19 genetic risk factor (chromosome 3 locus tagged by rs10490770) with mortality, COVID-19-related complications, and laboratory values. We next performed metaanalyses using FinnGen and the Columbia University COVID-19 Biobank.

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In the Arctic part of the Nordic region, cultivated crops need to specifically adapt to adverse and extreme climate conditions, such as low temperatures, long days, and a short growing season. Under the projected climate change scenarios, higher temperatures and an earlier spring thaw will gradually allow the cultivation of plants that could not be previously cultivated there. For millennia, Pea ( L.

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  • This study examines the pathophysiology of COVID-19 by analyzing single-cell and spatial atlases from various organ autopsy samples of individuals who died from the virus.
  • Findings revealed significant changes in lung tissue, including impaired tissue regeneration and inflammation, indicating how SARS-CoV-2 affects different cell types.
  • The research provides crucial insights into the biological impact of severe COVID-19, aiding in the development of potential new treatments.
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  • The study investigates how a specific genetic marker (rs10490770) linked to COVID-19 severity affects younger adults, revealing that genetic predisposition may significantly impact health outcomes.
  • Data from 13,424 patients showed that carriers of the risk allele faced higher mortality rates and complications from COVID-19, particularly severe respiratory failure and liver injury.
  • Younger patients (≤60 years) with the risk allele had more severe outcomes than older patients, indicating that the genetic risk factor has an age-dependent effect on COVID-19 severity.
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Article Synopsis
  • The SARS-CoV-2 pandemic has led to over 1 million deaths worldwide, primarily due to severe lung injuries and multiple organ failures, but there is limited understanding of the immune responses involved in COVID-19.
  • Researchers collected and analyzed over 420 tissue samples from various organs of 17 COVID-19 victims, utilizing advanced techniques like RNA sequencing to map out cellular changes related to their illness.
  • Significant findings include alterations in lung tissue cell types, such as the increase of specific progenitor cells and myofibroblasts, indicating impaired tissue repair and failed regenerative processes in severely damaged lungs.
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Over 130 X-linked genes have been robustly associated with developmental disorders, and X-linked causes have been hypothesised to underlie the higher developmental disorder rates in males. Here, we evaluate the burden of X-linked coding variation in 11,044 developmental disorder patients, and find a similar rate of X-linked causes in males and females (6.0% and 6.

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Background: Cognitive impairment is a common and disabling consequence of traumatic brain injury (TBI) but its impact on health-related quality of life is not well understood.

Objective: To investigate the relationship between cognitive impairment and health-related quality of life (HRQoL) after TBI.

Methods: Retrospective, cross-sectional study of a specialist TBI outpatient clinic patient sample.

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We estimated the genome-wide contribution of recessive coding variation in 6040 families from the Deciphering Developmental Disorders study. The proportion of cases attributable to recessive coding variants was 3.6% in patients of European ancestry, compared with 50% explained by de novo coding mutations.

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There are thousands of rare human disorders that are caused by single deleterious, protein-coding genetic variants. However, patients with the same genetic defect can have different clinical presentations, and some individuals who carry known disease-causing variants can appear unaffected. Here, to understand what explains these differences, we study a cohort of 6,987 children assessed by clinical geneticists to have severe neurodevelopmental disorders such as global developmental delay and autism, often in combination with abnormalities of other organ systems.

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Objectives: Traumatic brain injury (TBI) is a major cause of long-term disability with variable recovery. Preclinical studies suggest that vitamin D status influences the recovery after TBI. However, there is no published clinical data on links between vitamin D status and TBI outcomes.

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Several studies conducted in Western democracies have indicated that men continue to be overrepresented and women underrepresented as experts in the media. This article explores the situation in Finland, a progressive and 'female-friendly' Nordic country with highly educated women who are widely present in the job market. The analysis is based on three sets of research data featuring a wide set of media data, a survey and interviews.

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Background: Hypertrophic cardiomyopathy (HCM) is predominantly caused by a large number of various mutations in the genes encoding sarcomeric proteins. However, two prevalent founder mutations for HCM in the alpha-tropomyosin (TPM1-D175N) and myosin-binding protein C (MYBPC3-Q1061X) genes have previously been identified in eastern Finland.

Objective: To assess the prevalence of these founder mutations in a large population of patients with HCM from all over Finland.

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Introduction: The performance of exercise electrocardiography (ECG) for the detection of coronary artery disease (CAD) in women has been limited. The recently developed computerized variable, ST-segment depression/heart rate (ST/HR) hysteresis, has been proved to detect CAD in men more accurately than traditional methods. However, the diagnostic performance of ST/HR hysteresis has not been evaluated in women.

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Article Synopsis
  • The study analyzes the effectiveness of heart rate variability (HRV) from exercise ECG in detecting coronary artery disease (CAD) using data from two patient groups: one with confirmed CAD and one with low likelihood of CAD.
  • HRV parameters were calculated during different exercise phases, and while uncorrected HRV showed better diagnostic performance post-exercise, HR-corrected values performed worse.
  • Overall, the performance of HRV analysis is considered inadequate compared to traditional ST-segment analysis for CAD detection, suggesting that HRV isn't as reliable for diagnosing the condition.
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Background: Nicotinamide adenine dinucleotide phosphate (NADPH) oxidase is a major source of the superoxide anion, which may play an important role in the development of atherosclerosis and coronary artery disease (CAD). The p22phox, a component of the NADPH oxidase, is essential for the activation of this enzyme, and intensive expression of the p22phox has been reported in human atherosclerotic arteries. However, studies on the association of the C242T polymorphism in the p22phox gene with CAD have produced conflicting results, and the relation of this polymorphism with CAD is not well known in a population with acquired risk factors enhancing the NADPH-dependent superoxide production.

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Background: The purpose of the Finnish Cardiovascular Study (FINCAVAS) is to construct a risk profile--using genetic, haemodynamic and electrocardiographic (ECG) markers--of individuals at high risk of cardiovascular diseases, events and deaths.

Methods And Design: All patients scheduled for an exercise stress test at Tampere University Hospital and willing to participate have been and will be recruited between October 2001 and December 2007. The final number of participants is estimated to reach 5,000.

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Objective: Vascular endothelial growth factor-D (VEGF-D) is a recently characterized member of the VEGF family, but its expression in atherosclerotic lesions remains unknown. We studied the expression of VEGF-D and its receptors (VEGFR-2 and VEGFR-3) in normal and atherosclerotic human arteries, and compared that to the expression pattern of VEGF-A.

Methods: Human arterial samples (n=39) obtained from amputation operations and fast autopsies were classified according to the stage of atherosclerosis and studied by immunohistochemistry.

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