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相关概念视频

Polygenic Traits01:18

Polygenic Traits

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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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Introduction to z Scores01:06

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A z score (or standardized value) is measured in units of the standard deviation. It tells you how many standard deviations the value x is above (to the right of) or below (to the left of) the mean, μ. Values of x that are larger than the mean have positive z scores, and values of x that are smaller than the mean have negative z scores. If x equals the mean, then x has a zero z score. It is important to note that the mean of the z scores is zero, and the standard deviation is one.
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Introduction to z Scores01:05

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A z score (or standardized value) is measured in units of the standard deviation. It indicates how many standard deviations the value x is above (to the right of) or below (to the left of) the mean, μ. Values of x that are larger than the mean have positive z scores, and values of x that are smaller than the mean have negative z scores. If x equals the mean, then x has a zero z score. It is important to note that the mean of the z scores is zero, and the standard deviation is one.
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z Scores and Area Under the Curve01:17

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z scores are the standardized values obtained after converting a normal distribution into a standard normal distribution. A z score is measured in units of the standard deviation. The z score tells you how many standard deviations the value x is above (to the right of) or below (to the left of) the mean, μ. Values of x that are larger than the mean have positive z scores, and values of x that are smaller than the mean have negative z scores. If x equals the mean, then x has a z score of...
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The z score is one of the three measures of relative standing. It describes the location of a value in a dataset relative to the mean. z scores are obtained after the standardization of the values in a dataset. The z score for the mean is 0.
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Calcium-Scoring CT ScanA calcium-scoring CT scan, also known as coronary artery calcium (CAC) scan, detects calcium deposits in the coronary arteries. This test assesses the risk of coronary artery disease (CAD), which can lead to cardiovascular events such as angina, heart failure, and sudden cardiac arrest.A calcium-scoring CT scan is generally recommended for individuals at intermediate risk of CAD without symptoms. It includes:Men aged 40-75 and women aged 50-75: Especially those with a...
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Updated: Jan 28, 2026

Field Identification of Matricaria chamomilla using a Portable qPCR System
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在多基因分数可移植性方面,有三个悬而未决的问题.

Joyce Y Wang1, Neeka Lin1, Michael Zietz2

  • 1Department of Integrative Biology, The University of Texas at Austin, Austin, TX, USA.

Nature communications
|January 26, 2026
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概括

多基因分数 (PGS) 显示在遗传祖先之间具有有限的可移植性. 超越遗传距离的因素,包括社会经济地位和特征演变,显著影响预测准确性,需要对公平应用有更广泛的理解.

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科学领域:

  • 遗传学 是一个遗传学.
  • 人口遗传学 人口遗传学
  • 生物信息学是一种生物信息学.

背景情况:

  • 多基因分数 (PGS) 越来越多地用于遗传研究,但在不同的人口中面临着可移植性的挑战.
  • 有限的可移植性源于个体和用于开发PGS的样本之间遗传祖先的差异.

研究的目的:

  • 研究影响多基因分数 (PGS) 预测准确性和可移植性的因素.
  • 超越全球祖先分组,探索PGS表现的其他决定因素.

主要方法:

  • 评估PGS预测准确性作为基因组范围内的遗传不相似性 (遗传距离) 与基因组范围协会研究 (GWAS) 样本的函数.
  • 分析了不同特征的可移植性趋势,包括与免疫相关的特征和2型糖尿病.

主要成果:

  • 个人水平的PGS预测准确性与遗传距离的相关性很弱,社会经济措施解释了可比变化.
  • 可移植性因特征而异;与免疫相关的特征显示,随着遗传距离的增加,准确性急剧下降.
  • 精度和回忆等性能指标与遗传距离有复杂的关系,正如2型糖尿病中所见的那样.

结论:

  • PGS可移植性受到包括遗传距离,特征进化,遗传架构,社会背景和PGS构建方法在内的复杂因素相互作用的影响.
  • 仅仅是全球祖先是不够的,以了解PGS可移植性.
  • 解决这些因素对于开发更准确和公平的多基因分数至关重要.