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Related Concept Videos

Non-LTR Retrotransposons03:18

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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...
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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.
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Related Experiment Video

Updated: Dec 29, 2025

Screening for Functional Non-coding Genetic Variants Using Electrophoretic Mobility Shift Assay EMSA and DNA-affinity Precipitation Assay DAPA
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Leptin levels are associated with multiple sclerosis risk.

Martin Biström1, Johan Hultdin2, Oluf Andersen3

  • 1Department of Pharmacology and Clinical Neuroscience, Umeå University, Umeå, Sweden.

Multiple Sclerosis (Houndmills, Basingstoke, England)
|February 8, 2020
PubMed
Summary
This summary is machine-generated.

Leptin, a hormone linked to obesity, is a risk factor for developing multiple sclerosis (MS) in young individuals. This study investigated leptin and insulin levels in relation to MS risk.

Keywords:
Multiple sclerosiscase–control studiesepidemiologyinsulinleptinrisk factors

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Area of Science:

  • Endocrinology
  • Neuroimmunology
  • Epidemiology

Background:

  • Early-life obesity is associated with an increased risk of developing multiple sclerosis (MS).
  • Leptin and insulin, hormones implicated in obesity, are potential factors to explore in the context of MS development.

Purpose of the Study:

  • To investigate whether leptin and insulin concentrations are risk factors for relapsing-remitting multiple sclerosis (RRMS).

Main Methods:

  • A nested case-control study utilized pre-symptomatic blood samples from Swedish biobanks.
  • Leptin and insulin levels were compared between 649 individuals who developed RRMS and 649 matched controls.
  • Conditional logistic regression analyzed the association between hormone levels and MS risk, focusing on individuals under 40.

Main Results:

  • Increased leptin levels correlated with a higher risk of MS in individuals younger than 20 years (OR=1.4) and in all men (OR=1.4).
  • Conversely, for women aged 30-39 years, higher leptin levels were associated with a reduced risk of MS (OR=0.74) after adjusting for insulin.
  • No significant association was found for insulin levels in relation to MS risk across the studied groups.

Conclusions:

  • The pro-inflammatory adipokine leptin is identified as a risk factor for MS, particularly in younger individuals.
  • These findings highlight the potential role of hormonal factors in the early pathogenesis of multiple sclerosis.