Causal associations between insulin and Lp(a) levels in Caucasian population: a Mendelian randomization study
Contact us if these videos are not relevant.
Contact us if these videos are not relevant.
View abstract on PubMed
Summary
This summary is machine-generated.Genetically predicted high insulin levels are linked to lower lipoprotein(a) [Lp(a)] levels. This finding may help explain why low Lp(a) is associated with increased type 2 diabetes risk.
Area Of Science
- Cardiovascular Genetics
- Metabolic Disorders
- Biochemistry
Background
- Observational studies suggest an inverse relationship between lipoprotein(a) [Lp(a)] and type 2 diabetes (T2D) risk.
- Mendelian randomization (MR) studies have yielded inconsistent results regarding this association.
- In vitro studies indicate that high insulin may suppress Lp(a) via apolipoprotein(a) [apo(a)] synthesis.
Purpose Of The Study
- To investigate the relationship between genetically predicted insulin concentrations and Lp(a) levels.
- To explore whether insulin influences Lp(a) levels, potentially explaining the Lp(a)-T2D risk association.
Main Methods
- Utilized two-sample summary-level Mendelian randomization (MR).
- Identified genetic variants for fasting insulin from large genome-wide association studies (GWAS) (N=151,013).
- Acquired Lp(a) data from a GWAS in UK Biobank (N=361,194); applied inverse-variance weighted (IVW) and sensitivity analyses.
Main Results
- Genetically predicted fasting insulin was negatively associated with Lp(a) levels (β = -0.15, P = 0.003).
- Weighted median (WME) method supported a causal link (β = -0.26, P = 0.0002).
- MR-Egger sensitivity analysis did not find significant evidence of causality (P = 0.11).
Conclusions
- This MR study provides robust evidence for an association between genetically predicted higher insulin and lower Lp(a) concentrations.
- Hyperinsulinemia, common in T2D, may partially explain the inverse association between low Lp(a) and increased T2D risk.
Contact us if these videos are not relevant.
Contact us if these videos are not relevant.
Related Concept Videos
Genome-wide association studies or GWAS are used to identify whether common SNPs are associated with certain diseases. Suppose specific SNPs are more frequently observed in individuals with a particular disease than those without the disease. In that case, those SNPs are said to be associated with the disease. Chi-square analysis is performed to check the probability of the allele likely to be associated with the disease.
GWAS does not require the identification of the target gene involved in...
Causality or causation is a fundamental concept in epidemiology, vital for understanding the relationships between various factors and health outcomes. Despite its importance, there's no single, universally accepted definition of causality within the discipline. Drawing from a systematic review, causality in epidemiology encompasses several definitions, including production, necessary and sufficient, sufficient-component, counterfactual, and probabilistic models. Each has its strengths and...
Insulin action is mediated through a receptor tyrosine kinase, akin to the IGF-1 receptor. The number of receptors per cell varies significantly, from 40 on erythrocytes to 300,000 on adipocytes and hepatocytes. The insulin receptor consists of linked α/β subunit dimers, forming a heterotetramer glycoprotein with two extracellular α subunits and two β subunits spanning the membrane. The α subunits inhibit the inherent tyrosine kinase activity of the β subunits, but...
Although Mendel chose seven unrelated traits in peas to study gene segregation, most traits involve multiple gene interactions that create a spectrum of phenotypes. When the interaction of various genes or alleles at different locations influences a phenotype, this is called epistasis. Epistasis often involves one gene masking or interfering with the expression of another (antagonistic epistasis). Epistasis often occurs when different genes are part of the same biochemical pathway. The...
Agouti: A Lethal Allele
Lucien Cuénot discovered lethal alleles in 1905 while studying the inheritance of coat color in mice. The agouti gene is responsible for the color of the coat in mice. This gene codes for an agouti-signaling protein, which is responsible for melanin distribution in mammals. The wild-type allele gives rise to gray-brown coat color in mice, while the mutant allele gives rise to yellow coat color. In addition to coat color, the agouti gene is associated with the yellow...
As the name suggests, non-LTR retrotransposons lack the long terminal repeats characteristic of the LTR retrotransposons. Additionally, both LTR and non-LTR retrotransposons use distinct mechanisms of mobilization. Non-LTR retrotransposons are further divided into two classes - Long interspersed nuclear elements (LINEs) and short interspersed nuclear elements (SINEs), both of which occur abundantly in most mammals, including humans. Some of the active non-LTR retrotransposons in humans are L1...