Cited by 18Genetic diversity and population structureEvolution and Genetic DynamicsRace, Genetics, and Society

A General Model of the Relationship between the Apportionment of Human Genetic Diversity and the Apportionment of Human Phenotypic Diversity

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Edge, Rosenberg·2015·Human Biology

Abstract

Models that examine genetic differences between populations alongside a genotype-phenotype map can provide insight about phenotypic variation among groups. We generalize a simple model of a completely heritable, additive, selectively neutral quantitative trait to examine the relationship between single-locus genetic differentiation and phenotypic differentiation on quantitative traits. In agreement with similar efforts using different models, we show that the expected degree to which two groups differ on a neutral quantitative trait is not strongly affected by the number of genetic loci that influence the trait: neutral trait differences are expected to have a magnitude comparable to the genetic differences at a single neutral locus. We discuss this result with respect to population differences in disease phenotypes, arguing that although neutral genetic differences between populations can contribute to specific differences between populations in health outcomes, systematic patterns of difference that run in the same direction for many genetically independent health conditions are unlikely to be explained by neutral genetic differentiation.

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Crossref · 10.13110/humanbiology.87.4.0313

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  • One key component of the inference of polygenic adaptation is the use of an appropriate null expectation for polygenic score distributions and phenotypic differences.

    “One key component of the inference of polygenic adaptation is the use of an appropriate null expectation for polygenic score distributions and phenotypic differences [12, 42].”

    From Interpreting polygenic scores, polygenic adaptation, and human phenotypic differences (2019) · cites this paper as [42]

    The Introduction (page not provided) gives an expected magnitude for between-group differences in a neutral polygenic trait. The Discussion’s “Interpreting Group Differences in Phenotype” section (page not provided) uses that neutral expectation to assess possible selection. Our copy does not address null distributions for polygenic scores, so it supports the phenotypic-differences part but not that part of the claim. (LLM, conf=0.82)

    Experimental — accuracy not yet measured
  • QST is equal to r/(2−r) for diploids.

    “For diploids, in terms of the variance proportion r discussed in the previous section, it is equal to QST=r/(2−r) (26).”
  • Under neutrality, the magnitude of phenotypic differences connects to the apportionment computation rather than the ancestry computation.

    “analysis of models for the genetic basis of phenotypes finds that under neutrality, the magnitude of phenotypic differences connects to the apportionment computation rather than the ancestry computation [42, 44].”
  • In the null model, systematic health disparities are unlikely: the binomial probability that the trait value is larger in one of a pair of populations for at least 28 of 36 independent phenotypes is 0.0012.

    “In this model, systematic health disparities are unlikely: assuming that no genetic correlation exists between phenotypic outcomes, the binomial probability that the trait value is larger in one of a pair of populations for at least 28 of 36 independent phenotypes is 0.0012 [42].”

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Research works printed but not linked: 5

  1. Adler NE, and Rehkopf DH. 2008. US disparities in health: Descriptions, causes, and mechanisms. Annu. Rev. Public Health 29: 235– 252. 18031225
  2. Bindon JR, and Baker PT. 1997. Bergmann’s rule and the thrifty genotype. Am. J. Phys. Anthropol 104: 201– 210. 9386827
  3. Brown RA, and Armelagos GJ. 2001. Apportionment of racial diversity: A review. Evol. Anthropol 10: 34– 40.
  4. Lynch M, and Spitze K 1994. Evolutionary genetics of Daphnia. In Ecological Genetics, Real L, ed. Princeton, NJ: Princeton University Press, 109– 128.
  5. Whitlock MC 2008. Evolutionary inference from QST. Mol. Ecol 17: 1, 885–1, 896. 18363667

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Authors
Edge, & Rosenberg
Venue
Human Biology
Publisher
Project MUSE
Published
2015
Volume
87
Issue
4
Pages
313
ISSN
0018-7143 (ISSN-L)
OpenAlex
W2529998249
Cited by
18
References
85
Citations by year
2025: 4 · 2024: 1 · 2022: 4 · 2021: 2 · 2020: 1 · 2019: 2 · 2018: 2 · 2017: 1 · 2015: 1
FWCI
0.92
Type
journal article
Language
en
Open access
Locations
  • Human Biology (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • Human Biology (submittedVersion)
  • Project Muse (Johns Hopkins University) (submittedVersion)
  • BioOne Complete (BioOne) (submittedVersion)
Funders
  • National Science Foundation (1458059)
  • National Institutes of Health
  • National Human Genome Research Institute (R01HG005855)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic diversity and population structure
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Evolution and Genetic Dynamics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Race, Genetics, and Society
Keywords
human genetic variation, phenotypic diversity, genetic differentiation, quantitative traits, neutral loci, additive genetic model, genotype-phenotype mapping, health outcomes, heritability
MeSH terms
Algorithms, Gene Frequency, Genetics, Population, Humans, Models, Genetic, Phenotype, Selection, Genetic, Genetic Variation, Quantitative Trait Loci, Genetic Drift, Health Status Disparities

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