2,415 results match your criteria: "Institute for Molecular Medicine Finland[Affiliation]"

Article Synopsis
  • Mosaic loss of the X chromosome (mLOX) is a common genetic alteration in female leukocytes, found in 12% of a study involving 883,574 female participants, with around 2% of their leukocytes showing this alteration.
  • Female individuals with mLOX have a higher risk of developing myeloid and lymphoid leukemias, and genetic studies revealed 56 common variants linked to mLOX, pointing towards genes involved in chromosomal errors and diseases.
  • The research also found specific rare genetic variants that significantly increase the risk of mLOX and demonstrated how certain X chromosome alleles are preferentially retained, suggesting that both genetic predispositions and selective pressures play a role in the development and growth
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  • Fecal calprotectin is a key indicator of gut inflammation, particularly relevant in older adults, with rising levels linked to inflammatory bowel disease (IBD) and other conditions.
  • A study examined 735 older adults, identifying three groups based on calprotectin levels; high levels correlated with an increase in harmful gut bacteria, a decrease in beneficial bacteria, and elevated systemic inflammation markers.
  • The findings highlight how elevated fecal calprotectin relates not just to gut microbial changes, but also to higher body mass index (BMI) and greater prevalence of chronic diseases like heart attacks and obesity.
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Polygenic scores (PGSs) offer the ability to predict genetic risk for complex diseases across the life course; a key benefit over short-term prediction models. To produce risk estimates relevant to clinical and public health decision-making, it is important to account for varying effects due to age and sex. Here, we develop a novel framework to estimate country-, age-, and sex-specific estimates of cumulative incidence stratified by PGS for 18 high-burden diseases.

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Article Synopsis
  • The TWINGEN study aims to identify individuals at high risk for Alzheimer's disease (AD) by assessing various cognitive and health-related factors through an observational clinical recall and biomarker analysis.
  • The study involves around 800 participants, gathering data through blood samples, questionnaires, and wearable technology for lifestyle metrics, while also including a smaller group for in-person assessments.
  • All data collected will be integrated with existing Finnish biobank records and utilized for further research, following ethical guidelines set by relevant authorities.
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Individuals with type 1 diabetes (T1D) carry a markedly increased risk of stroke, with distinct clinical and neuroimaging characteristics as compared to those without diabetes. Using whole-exome or whole-genome sequencing of 1,051 individuals with T1D, we aimed to find rare and low-frequency genomic variants associated with stroke in T1D. We analysed the genome comprehensively with single-variant analyses, gene aggregate analyses, and aggregate analyses on genomic windows, enhancers and promoters.

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Purpose: High levels of physical activity have been documented in eating disorder patients. Our aim was to examine whether adolescent leisure-time physical activity is prospectively associated with eating disorders in adolescence and young adulthood.

Methods: Finnish twins born in 1983-1987 reported their physical activity frequency at ages 12, 14, and 17.

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Coronary artery disease (CAD) is the leading cause of death among adults worldwide. Accurate risk stratification can support optimal lifetime prevention. Current methods lack the ability to incorporate new information throughout the life course or to combine innate genetic risk factors with acquired lifetime risk.

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Detection of a major Lynch Syndrome-causing MLH1 founder variant in a large-scale genotyped cohort.

Fam Cancer

November 2024

Applied Tumor Genomics, Research Programs Unit, University of Helsinki, Biomedicum Helsinki Haartmaninkatu 8), PO Box 63, 00014, Helsinki, Finland.

Article Synopsis
  • About 50% of Finnish Lynch Syndrome cases are linked to a specific variant in the MLH1 gene, resulting from a deletion in exon 16 caused by recombination.* -
  • The study validated this variant in a population cohort from FinnGen and the Central Finland Biobank, comparing cancer rates and onset age between those with and without the variant.* -
  • They found that out of 348 potential variant carriers, a significant portion had cancer or a family history of cancer, highlighting the potential of large genetic studies for detecting hereditary cancer risks.*
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How the oncogene drives cancer growth remains poorly understood. Therefore, we established a systemwide portrait of KRAS- and extracellular signal-regulated kinase (ERK)-dependent gene transcription in KRAS-mutant cancer to delineate the molecular mechanisms of growth and of inhibitor resistance. Unexpectedly, our KRAS-dependent gene signature diverges substantially from the frequently cited Hallmark KRAS signaling gene signature, is driven predominantly through the ERK mitogen-activated protein kinase (MAPK) cascade, and accurately reflects KRAS- and ERK-regulated gene transcription in KRAS-mutant cancer patients.

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Background: Variation in X chromosome inactivation (XCI) in human-induced pluripotent stem cells (hiPSCs) can impact their ability to model biological sex biases. The gene-wise landscape of X chromosome gene dosage remains unresolved in female hiPSCs. To characterize patterns of de-repression and escape from inactivation, we performed a systematic survey of allele specific expression in 165 female hiPSC lines.

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Article Synopsis
  • The study investigates the genetic basis of supraventricular tachycardias, focusing on atrioventricular nodal reentrant tachycardia (AVNRT) and atrioventricular accessory pathways/reciprocating tachycardia (AVAP/AVRT).
  • Through multiancestry meta-analyses of genome-wide association studies, researchers identified significant genetic loci associated with AVNRT and AVAP/AVRT, implicating specific genes in these cardiac conditions.
  • The results suggest that gene regions related to ion channels and cardiac development play crucial roles in susceptibility to supraventricular tachycardias, potentially influencing other cardiovascular issues such as atrial fibrillation
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Resistance to therapy commonly develops in patients with high-grade serous ovarian carcinoma (HGSC) and triple-negative breast cancer (TNBC), urging the search for improved therapeutic combinations and their predictive biomarkers. Starting from a CRISPR knockout screen, we identified that loss of RB1 in TNBC or HGSC cells generates a synthetic lethal dependency on casein kinase 2 (CK2) for surviving the treatment with replication-perturbing therapeutics such as carboplatin, gemcitabine, or PARP inhibitors. CK2 inhibition in RB1-deficient cells resulted in the degradation of another RB family cell cycle regulator, p130, which led to S phase accumulation, micronuclei formation, and accelerated PARP inhibition-induced aneuploidy and mitotic cell death.

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Hydroxysteroid (17beta) dehydrogenase 1 (HSD17B1) is a steroid synthetic enzyme expressed in ovarian granulosa cells and placental syncytiotrophoblasts. Here, HSD17B1 serum concentration was measured with a validated immunoassay during pregnancy at three time points (12-14, 18-20 and 26-28 weeks of gestation). The concentration increased 2.

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Oral and non-oral lichen planus show genetic heterogeneity and differential risk for autoimmune disease and oral cancer.

Am J Hum Genet

June 2024

Institute of Dentistry, Faculty of Health Sciences, University of Eastern Finland, Kuopio, Finland; Odontology Education Unit, and Oral and Maxillofacial Diseases Clinic, Kuopio University Hospital, Kuopio, Finland.

Lichen planus (LP) is a T-cell-mediated inflammatory disease affecting squamous epithelia in many parts of the body, most often the skin and oral mucosa. Cutaneous LP is usually transient and oral LP (OLP) is most often chronic, so we performed a large-scale genetic and epidemiological study of LP to address whether the oral and non-oral subgroups have shared or distinct underlying pathologies and their overlap with autoimmune disease. Using lifelong records covering diagnoses, procedures, and clinic identity from 473,580 individuals in the FinnGen study, genome-wide association analyses were conducted on carefully constructed subcategories of OLP (n = 3,323) and non-oral LP (n = 4,356) and on the combined group.

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Coronary microvascular disease (CMD) and its progression towards major adverse coronary events pose a significant health challenge. Accurate in vitro investigation of CMD requires a robust cell model that faithfully represents the cells within the cardiac microvasculature. Human pluripotent stem cell-derived endothelial cells (hPSC-ECs) offer great potential; however, they are traditionally derived via differentiation protocols that are not readily scalable and are not specified towards the microvasculature.

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Article Synopsis
  • * Using advanced models, researchers analyzed cardiac MRI data from over 40,000 UK Biobank participants to assess left atrial volume metrics.
  • * A genome-wide study identified 20 genetic factors related to left atrial structure, suggesting that genetic predisposition to larger atrial volume increases the risk of atrial fibrillation and related issues like stroke.
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Purpose: We investigated whether longitudinally assessed physical activity (PA) and adherence specifically to World Health Organization PA guidelines mitigate or moderate mortality risk regardless of genetic liability to cardiovascular disease (CVD). We also estimated the causality of the PA-mortality association.

Methods: The study used the older Finnish Twin Cohort with 4897 participants aged 33 to 60 yr (54.

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Central serous chorioretinopathy (CSC) is a fluid maculopathy whose etiology is not well understood. Abnormal choroidal veins in CSC patients have been shown to have similarities with varicose veins. To identify potential mechanisms, we analyzed genotype data from 1,477 CSC patients and 455,449 controls in FinnGen.

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Background: Both overweight and cognitive deficits are common among people with schizophrenia (SZ) and schizoaffective disorder. The results in earlier studies have been inconsistent on whether overweight is associated with cognitive deficits in psychotic disorders.

Aims: Our aim in this study was to detect possible associations between obesity and cognitive deficits among study participants with SZ and schizoaffective disorder.

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Genetic Study of Psoriasis Highlights its Close Link with Socioeconomic Status and Affective Symptoms.

J Invest Dermatol

December 2024

Systems epidemiology, Research Unit of Population Health, Faculty of Medicine, University of Oulu and Biocenter Oulu, Oulu, Finland.

Article Synopsis
  • Psoriasis is a skin disease with about 70% heritability, and a large study with 925,649 individuals was conducted to identify genetic risk factors.
  • Researchers found 6 new risk loci linked to the NF-κB signaling pathway and immunity, highlighting correlations between psoriasis and factors like smoking, body weight, and education level.
  • The study also uncovered causal relationships between psoriasis and mood symptoms, as well as a reciprocal effect with lower education, which could inform future treatment strategies.
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Objectives: The primary aim was to investigate if frozen embryo transfer (FET) without a corpus luteum increases the risk of hypertensive disorders of pregnancy (HDP). The secondary aim was to investigate other adverse maternal and perinatal outcomes.

Methods: This was a retrospective cohort study of 1168 singleton pregnancies and live births following a FET with either an artificial cycle (AC-FET) (n = 631) or a natural/modified natural/stimulated cycle (CL-FET) (n = 537) between 2012 and 2020.

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Purpose: Population-based studies on the associations of plant-based foods, red meat or dairy with gut microbiome are scarce. We examined whether the consumption of plant-based foods (vegetables, potatoes, fruits, cereals), red and processed meat (RPM) or dairy (fermented milk, cheese, other dairy products) are related to gut microbiome in Finnish adults.

Methods: We utilized data from the National FINRISK/FINDIET 2002 Study (n = 1273, aged 25-64 years, 55% women).

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A harmonized public resource of deeply sequenced diverse human genomes.

Genome Res

June 2024

Stanley Center for Psychiatric Research, The Broad Institute of MIT and Harvard, Cambridge, Massachusetts 02142, USA;

Underrepresented populations are often excluded from genomic studies owing in part to a lack of resources supporting their analyses. The 1000 Genomes Project (1kGP) and Human Genome Diversity Project (HGDP), which have recently been sequenced to high coverage, are valuable genomic resources because of the global diversity they capture and their open data sharing policies. Here, we harmonized a high-quality set of 4094 whole genomes from 80 populations in the HGDP and 1kGP with data from the Genome Aggregation Database (gnomAD) and identified over 153 million high-quality SNVs, indels, and SVs.

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Evaluation of BH3 mimetics as a combination therapy with irradiation in head and neck squamous cell carcinoma.

Biomed Pharmacother

June 2024

Department of Oral and Maxillofacial Diseases, University of Helsinki, Helsinki 00014, Finland; Translational Immunology Research Program (TRIMM), University of Helsinki, Helsinki 00014, Finland; Cancer and Translational Medicine Research Unit, University of Oulu, Oulu 90014, Finland; Medical Research Center, Oulu University Hospital, Oulu 90220, Finland; Department of Pathology, Helsinki University Hospital (HUS), Helsinki 00029, Finland.

Introduction: Head and neck squamous cell carcinoma (HNSCC) is a common cancer with a five-year survival rate around 60%, indicating a need for new treatments. BH3 mimetics are small molecules that inhibit anti-apoptotic Bcl-2 family proteins, resulting in apoptosis induction.

Methods: We performed a high-throughput screen using a Myogel matrix to identify the synergy between irradiation and the novel BH3 mimetics A-1155463, A-1331852, and navitoclax in 12 HNSCC cell lines, normal (NOF) and cancer-associated fibroblasts (CAF), and dysplastic keratinocytes (ODA).

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