Developmental nonlinearity drives phenotypic robustness
Open accessAbstract
Robustness to perturbation is a fundamental feature of complex organisms. Mutations are the raw material for evolution, yet robustness to their effects is required for species survival. The mechanisms that produce robustness are poorly understood. Nonlinearities are a ubiquitous feature of development that may link variation in development to phenotypic robustness. Here, we manipulate the gene dosage of a signaling molecule, Fgf8, a critical regulator of vertebrate development. We demonstrate that variation in Fgf8 expression has a nonlinear relationship to phenotypic variation, predicting levels of robustness among genotypes. Differences in robustness are not due to gene expression variance or dysregulation, but emerge from the nonlinearity of the genotype–phenotype curve. In this instance, embedded features of development explain robustness differences. How such features vary in natural populations and relate to genetic variation are key questions for unraveling the origin and evolvability of this feature of organismal development.
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There is a lack of strong correlation between the magnitude of PICALM alteration and its functional effects in CRISPR-engineered iMGs.
“We acknowledge a lack of strong correlation between the magnitude of PICALM alteration and its functional effects in CRISPR-engineered iMGs, probably due to technical variations in iMG differentiation and/or the nonlinear relationship between gene expression and cellular phenotypes due to epistasis and systems buffering54,55.”
From PICALM Alzheimer’s risk allele causes aberrant lipid droplets in microglia (2025) · cites this paper as [54]
The Introduction describes nonlinear relationships in which variation in gene expression can be buffered before it affects phenotype, supporting the proposed explanation in general. But the paper studies Fgf8 and craniofacial morphology, not PICALM in CRISPR-engineered iMGs; its Discussion also describes developmental nonlinearity as a cause, rather than a consequence, of epistasis. The iMG correlation is the citing authors’ own observation, not a finding attributed to this source. (LLM, conf=0.83)
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- Authors
- Green, R. M., Fish, J. L., Young, N. M., Smith, F. J., Roberts, B., Dolan, K., Choi, I., Leach, C. L., Gordon, P., Cheverud, J. M., Roseman, C. C., Williams, T. J., Marcucio, R. S., & Hallgrímsson, B.
- Affiliations
- University of Calgary (CA)
- University of Massachusetts Lowell (US)
- University of California, San Francisco (US)
- University of Colorado Anschutz (US)
- Loyola University Chicago (US)
- University of Illinois Urbana-Champaign (US)
- Corresponding author
- Marcucio, Ralph S.
- Hallgrímsson, Benedikt
- ORCID
- Venue
- Nature Communications
- Published
- 2017-12-06
- Volume
- 8
- Issue
- 1
- Pages
- 1970-1970
- ISSN
- 2041-1723 (ISSN-L)
- PMC
- PMC5719035
- OpenAlex
- W2774097669
- Cited by
- 106
- References
- 77
- Citations by year
- 2026: 8 · 2025: 14 · 2024: 9 · 2023: 15 · 2022: 9 · 2021: 16 · 2020: 8 · 2019: 21 · 2018: 6
- FWCI
- 6.35
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Locations
- Nature Communications (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- Loyola eCommons (Loyola University of Chicago) (submittedVersion, cc-by)
- RePEc: Research Papers in Economics (submittedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- eScholarship (California Digital Library) (submittedVersion)
- Funders
- National Institutes of Health (NIH-R01)
- Natural Sciences and Engineering Research Council of Canada (238992, 238992‐17)
- National Institute of Dental and Craniofacial Research (R01DE019843, R01DE019638)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Evolution and Genetic Dynamics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Developmental Biology and Gene Regulation
- Physical Sciences › Mathematics › Geometry and Topology › Morphological variations and asymmetry
- Keywords
- phenotypic robustness, FGF8, gene dosage, genotype-phenotype mapping, developmental variation, vertebrate development, evolvability
- MeSH terms
- Animals, Computer Simulation, Biological Evolution, Gene Expression Regulation, Genotype, Male, Models, Genetic, Mutation, Phenotype, RNA, Genetic Variation, Gene Expression, Nonlinear Dynamics, Gene Dosage, Evolution, Molecular, Mice, Fibroblast Growth Factor 8, Gene Regulatory Networks
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