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Related Concept Videos

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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Human Genetics01:28

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Human genetics provides a profound framework for understanding the interplay between genetic predispositions and human psychology. At the heart of this discipline lies the study of how genes influence physical traits, behaviors, and susceptibility to diseases. Each person carries a unique genetic code that subtly or significantly shapes their psychological and behavioral landscape.
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Inheritance01:25

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Gregor Mendel's pioneering work on the principles of inheritance fundamentally transformed our understanding of how traits are transmitted from generation to generation. His experiments with pea plants laid the groundwork for the discovery of genes, discrete units within organisms that control heredity.
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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...
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From Genotype to Phenotype: Polygenic Prediction of Complex Human Traits.

Timothy G Raben1, Louis Lello1,2, Erik Widen1

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Genomic prediction of human traits from DNA is advancing, enabling accurate forecasting of complex characteristics and disease risks. This technology holds potential for personalized medicine and future genetic applications.

Keywords:
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Area of Science:

  • Genomics
  • Human Genetics
  • Quantitative Trait Loci (QTL) Analysis

Background:

  • Decoding the human genome allows prediction of organism characteristics (phenotype) from DNA (genotype).
  • Genomic prediction is crucial for understanding complex traits and common diseases.

Purpose of the Study:

  • To review the current state and future potential of genomic prediction for complex human traits.
  • To explore the accuracy of predicting phenotypes from DNA and its implications.

Main Methods:

  • Analysis of genomic data to assess prediction accuracy for various traits.
  • Review of polygenic scores and their association with disease risk.
  • Discussion of genetic architecture and validation methods.

Main Results:

  • Highly heritable complex phenotypes like height are predictable from DNA with reasonable accuracy.
  • Individuals with outlier polygenic scores face significantly higher risks for common diseases (e.g., heart disease, diabetes, cancer) and psychiatric conditions (e.g., schizophrenia, autism).

Conclusions:

  • Genomic prediction offers substantial insights into individual health risks and predispositions.
  • Future applications include personalized medicine, assisted reproductive technologies (embryo selection), and genetic engineering.