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相关概念视频

Obesity01:24

Obesity

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The Body Mass Index (BMI) is a numerical value derived from a person's weight and height, used to categorize individuals into weight ranges. It is calculated using the formula: weight in kilograms divided by height in meters squared. Obesity is a health condition characterized by excessive accumulation of adipose tissue that poses health risks, often diagnosed with a BMI ≥ 30. This excess fat storage occurs when surplus dietary calories are converted into triglycerides and stored in...
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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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Sequencing of the human genome has opened up several best-kept secrets of the genome. Scientists have identified thousands of genome variations that exist within a population. These variations can be a single nucleotide or a larger chromosomal variation.
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When more than one gene is responsible for a given phenotype, the trait is considered polygenic. Human height is a polygenic trait. Studies have uncovered hundreds of loci that influence height, and there are believed to be many more. Due to the high number of genes involved, as well as environmental and nutritional factors, height varies significantly within a given population. The distribution of height forms a bell-shaped curve, with relatively few individuals in the population at the...
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与BMI相关的序列变异通过BMI本身影响疾病风险.

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门德尔的随机化研究表明,身体质量指数 (BMI) 的遗传风险影响疾病. 这项研究表明,与BMI变异相关的大部分疾病风险都是通过BMI本身来调解的,而不是其他途径.

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科学领域:

  • 遗传学 是一个遗传学.
  • 流行病学 流行病学
  • 代谢疾病 代谢疾病

背景情况:

  • 门德尔随机化 (MR) 研究将身体质量指数 (BMI) 与许多疾病联系起来.
  • 这些协会的确切调解途径仍然不完全理解.

研究的目的:

  • 调查基因倾向于更高的BMI是否仅通过BMI或通过其他生物机制增加疾病风险.
  • 为了区分疾病的直接遗传影响与BMI介导的遗传影响.

主要方法:

  • 在大人口数据集 (冰岛和英国生物库) 中使用了与BMI遗传风险评分的MR.
  • 检查了BMI遗传风险得分与各种疾病结局之间的关联,无论是未调整的还是根据测量BMI的条件.
  • 在考虑BMI的影响后,评估了疾病风险关联的减弱.

主要成果:

  • 在BMI的条件下,BMI遗传风险得分与包括脂肪肝疾病,葡萄糖不耐受性和膝关节置换在内的疾病之间的关联完全减弱.
  • 对2型糖尿病,心力衰竭,心肌梗塞,心房动和关节置换也观察到显著的减弱.
  • 慢性病和中风的部分衰减被注意到,有一些变化.

结论:

  • 这些发现强烈表明,大多数与BMI相关的遗传变异相关的疾病风险都是通过BMI本身进行的.
  • 这突显了BMI降低作为治疗策略的潜力,用于广泛的与肥胖有关的疾病.
  • 其余效应需要进一步调查潜在的型变化,BMI的时间变化或其他混因素.