Causal Relationship Between Emotional Disorders and Thyroid Disorders: A Bidirectional Two-Sample Mendelian Randomization Study.

Introduction: The interplay between emotional disorders and thyroid disorders has been subject to numerous observational studies, which have consistently reported associations but have failed to establish clear causal links due to the multifactorial etiology and influences. We conducted a bidirectional two-sample Mendelian randomization (MR) analysis to explore the genetic causal association between emotional disorders and thyroid disorders.

Methods: We employed several methods, including inverse-variance weighted (IVW), weighted median, weighted mode, and MR Egger regression.

Exploration of the Biological Function of Ferroptosis in Bone Nonunion: An Analysis of Bioinformatics Combined Mendelian Randomization.

To deeply investigate the mechanism of ferroptosis-related genes in the process of bone nonunion based on the GEO database. And using Mendelian randomization to explore the causal association of 15 trace elements with the occurrence of bone nonunion. Bone nonunion RNA-seq data were retrieved and downloaded from the GEO database.

The relationship between smoking and recurrent aphthous stomatitis: A Mendelian randomization study.

Introduction: Existing research suggests an association between smoking and the incidence of recurrent aphthous stomatitis (RAS); however, the causal relationship remains ambiguous. We employed Mendelian randomization (MR) to clarify the potential causal association between smoking and the risk of developing RAS.

Methods: We utilized genome-wide association study (GWAS) sequencing data related to smoking from the Finnish database as instrumental variables (IVs) and GWAS data for RAS from the UK Biobank (UKB) as the outcome to perform a two-sample MR analysis.

A Mendelian randomization study on associations between plasma lipidome, circulating inflammatory proteins, and erectile dysfunction.

Background: Some studies suggest a potential association between plasma lipidome and erectile dysfunction (ED), but the underlying mechanism and whether circulating inflammatory proteins act as mediators remain unclear. The purpose of this study was to investigate the potential causal relationships between plasma lipidome, inflammatory proteins, and ED.

Methods: Plasma lipidome, circulating inflammatory proteins, and ED cases were identified based on the summary data from several large-scale genome-wide association studies (GWAS).

Association between circulating inflammatory proteins and temporomandibular disorders: insight from a two-sample Mendelian randomization analysis.

Background: Past studies have indicated links between specific inflammatory proteins in the bloodstream and temporomandibular disorders (TMDs). Nonetheless, there remains the need for further solid research pinpointing the exact causes behind these associations. This Mendelian randomization (MR) study aims to examine the association between 91 circulating inflammatory proteins and TMDs.

How do immune cells shape type 1 diabetes? Insights from Mendelian randomization.

Objective: The role of immune cells in type 1 diabetes (T1D) is unclear. The aim of this study was to assess the causal effect of different immune cells on T1D using Mendelian randomization (MR).

Methods: A dataset of immune cell phenotypes (numbered from GCST0001391 to GCST0002121) was obtained from the European Bioinformatics Institute, while a T1D dataset (numbered finngen_R10_T1D) was obtained from FinnGen.

Causal associations between sleep traits, sleep disorders, and glioblastoma: a two-sample bidirectional Mendelian randomization study.

Glioblastoma (GBM), a highly aggressive brain tumor predominantly affecting individuals over 40, often co-occurs with sleep disorders. However, the causal relationship remains unclear. This study employed a bidirectional Mendelian randomization (MR) approach to investigate the causal links between sleep traits/disorders and GBM.

Causal Relationship Between Inflammatory Cytokines and Pancreatitis Risk.

The causal relationship between inflammatory factors and acute pancreatitis (AP), chronic pancreatitis (CP), alcohol-induced acute pancreatitis (AAP), and alcohol-induced chronic pancreatitis (ACP) remains unclear. We aimed to examine the casual relationship between inflammatory factors and various forms of pancreatitis, namely, AP, CP, AAP, and ACP. We employed a two-sample Mendelian randomization (MR) analysis to investigate the causal relationship between 91 inflammatory factors and 41 inflammatory factors with respect to pancreatitis.

The role of mitochondrial DNA copy number in female infertility: a bidirectional two-sample Mendelian randomization study.

Background: Previous studies on the impact of mitochondrial DNA (mtDNA) copy number on female infertility were limited and inconsistent.

Methods: The causal relationship between mtDNA copy number and female infertility was evaluated using a bidirectional 2-sample Mendelian randomization (MR) method. Inverse variance weighted (IVW) method was applied for principal analysis, and MR-Egger, weighted median, simple mode, weighted mode method for secondary analyses.

Causal evidence of the relationship between polycystic ovary syndrome and obstructive sleep apnea in European and East Asian populations: a two-sample Mendelian randomization study.

Background: Several studies have documented the high prevalence of obstructive sleep apnea (OSA) among women with polycystic ovary syndrome (PCOS). However, causal relationships between the two conditions remain unconfirmed. This study aims to assess the causal relationships between OSA and PCOS.

Unveiling the skin microbial guardians and assailants in psoriasis subtypes: a Mendelian randomization study.

Previous studies have shown an association between skin microbiota and psoriasis, but the causal relationship between skin microbiota and different psoriasis subtypes remains unexplored. Our study employed the Mendelian randomization (MR) method, using summary statistics from Genome-Wide Association Studies, to investigate the causal relationships between skin microbiota and different subtypes of psoriasis. The inverse variance weighted (IVW) method served as the primary method in our MR study.

No causal association between serum vitamin D levels and bronchiectasis: A Mendelian randomization analysis.

Observational studies have reported an association between Vitamin D deficiency and an increased risk of bronchiectasis. This study aims to investigate the causal relationship between Vitamin D levels and bronchiectasis using a 2-sample Mendelian randomization (MR) analysis. Data from 2 genome-wide association studies (GWAS) based on European ancestry were analyzed: serum vitamin D levels (sample size = 441,291 [UK Biobank]) and bronchiectasis (sample size = 187,830 [cases = 1107, controls = 186,723; FinnGen]).

Mendelian randomization study on the association of circulating ketone bodies with lung cancer and respiratory diseases.

The liver produces various ketone bodies (KBs) including 3-Hydroxybutyrate (3-OHB), acetoacetate (AcAc), and acetone, with 3-OHB being the major component. Previous studies have shown that KBs protect against respiratory diseases; however, there is no evidence of a genetic link. To avoid biases existing in traditional observational studies, a two-sample Mendelian randomization (MR) analysis was carried out to investigate genetic causation and novel therapeutic uses for KBs.

Causal relationship between immune cells and acute myeloid leukemia: a two-sample Mendelian randomization study.

Background: Immune cells are crucial in the etiology of acute myeloid leukemia (AML). Given the genetic, epigenetic, and clonal complexities of AML, pinpointing factors linked to immunotherapy presents a formidable challenge. Moreover, investigations into the connection between immune cells and AML are still in their infancy, necessitating further studies to decode the intricate connections involved.

Dissecting the association between blood pressure traits, hypertension, antihypertensive medications and epilepsy: A Mendelian randomization study.

Background: Observational studies suggest that hypertension and epilepsy have a high co-occurrence, and antihypertensive medications may have impacts on the prevention and treatment of epilepsy. However, the directionality of causation between them is elusive.

Method: By leveraging genome-wide association studies (GWAS) summary data of each trait, we firstly performed bidirectional univariate Mendelian randomization (UVMR) to assess the strength and direction of the associations between pairs of traits, then multivariate MR (MVMR) was conducted to adjust for potential confounders in causalities.

Probiotics and their metabolite spermidine enhance IFN-γCD4 T cell immunity to inhibit hepatitis B virus.

The therapeutic potential of commensal microbes and their metabolites is promising in the functional cure of chronic hepatitis B virus (HBV) infection, which is defined as hepatitis B surface antigen (HBsAg) loss. Here, using both specific-pathogen-free and germ-free mice, we report that probiotics significantly promote the decline of HBsAg and inhibit HBV replication by enhancing intestinal homeostasis and provoking intrahepatic interferon (IFN)-γCD4 T cell immune response. Depletion of CD4 T cells or blockage of IFN-γ abolishes probiotics-mediated HBV inhibition.

Unveiling the causal effects of gut microbiome on trimethylamine N-oxide: evidence from Mendelian randomization.

Objective: The relationship between gut microbiome and trimethylamine oxide (TMAO) has not been fully elucidated. We aimed to assess the causal effects of different gut microbes on TMAO using Mendelian randomization (MR).

Methods: Gut microbiome and TMAO datasets were acquired from genome-wide association studies and screened for single nucleotide polymorphisms according to the basic assumptions of MR.

Unequal causality between autoimmune thyroiditis and inflammatory bowel disease: a Mendelian randomization study.

Objective: This study aims to analyze the causal relationship between autoimmune thyroiditis (AIT) and inflammatory bowel disease (IBD) using bidirectional Mendelian randomization (MR).

Methods: Single nucleotide polymorphisms were obtained from FinnGen. Exposure-outcome causality was assessed using inverse variance weighted, MR-Egger, and weighted median.

PD-1/PD-L1 and coronary heart disease: a mendelian randomization study.

Introduction: It has been found that programmed cell death protein-1 (PD-1) or its ligand PD-L1 may play an important role in the onset and progression of coronary heart disease (CHD). Thus, we conducted this mendelian randomization analysis (MR) to estimate the causal relationship between PD-1/PD-L1 and 5 specific CHDs (chronic ischemic heart disease, acute myocardial infarction, angina pectoris, coronary atherosclerosis, and unstable angina pectoris), complemented by gene set enrichment analysis (GSEA) for further validation.

Methods: Publicly available summary-level data were attained from the UK Biobank with genetic instruments obtained from the largest available, nonoverlapping genome-wide association studies (GWAS).

Venous thromboembolism and ovarian cancer risk: a Mendelian randomized study.

Introduction: A potential link between venous thromboembolism and the risk of ovarian cancer has been identified in clinical practice. However, it is unclear whether there is a causal relationship between the two. In this study, we applied a univariate two-sample Mendelian randomization method to explain the possible link between venous thromboembolism and ovarian cancer pathogenesis at the genetic level, and pointed out that lipid metabolism and ovarian cancer pathogenesis have innovative basic experimental directions.