Genomic signatures of domestication on neurogenetic genes in Drosophila melanogaster
Open accessAbstract
BACKGROUND: Domesticated animals quickly evolve docile and submissive behaviors after isolation from their wild conspecifics. Model organisms reared for prolonged periods in the laboratory also exhibit similar shifts towards these domesticated behaviors. Yet whether this divergence is due to inadvertent selection in the lab or the fixation of deleterious mutations remains unknown. RESULTS: Here, we compare the genomes of lab-reared and wild-caught Drosophila melanogaster to understand the genetic basis of these recently endowed behaviors common to laboratory models. From reassembled genomes of common lab strains, we identify unique, derived variants not present in global populations (lab-specific SNPs). Decreased selective constraints across low frequency SNPs (unique to one or two lab strains) are different from patterns found in the wild and more similar to neutral expectations, suggesting an overall accumulation of deleterious mutations. However, high-frequency lab SNPs found in most or all lab strains reveal an enrichment of X-linked loci and neuro-sensory genes across large extended haplotypes. Among shared polymorphisms, we also find highly differentiated SNPs, in which the derived allele is higher in frequency in the wild (Fst*wild>lab), enriched for similar neurogenetic ontologies, indicative of relaxed selection on more active wild alleles in the lab. CONCLUSIONS: Among random mutations that continuously accumulate in the laboratory, we detect common adaptive signatures in domesticated lab strains of fruit flies. Our results demonstrate that lab animals can quickly evolve domesticated behaviors via unconscious selection by humans early on a broad pool of disproportionately large neurogenetic targets followed by the fixation of accumulated deleterious mutations on functionally similar targets.
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These results are in line with claims in other studies on domestication, where categories like 'neurological process' frequently stand out strongly in gene ontology category enrichment analyses.
“These results are in line with claims in other studies on domestication [49, 123–125], where categories like ‘neurological process’ frequently stand out strongly in gene ontology category enrichment analyses.”
From Self-domestication in Homo sapiens: Insights from comparative genomics (2017) · cites this paper as [123]
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Self-domestication in Homo sapiens: Insights from comparative genomics
Theofanopoulou, C., Gastaldon, S., O’Rourke, T., Samuels, B. D., Messner, A., Martins, P. T., Delogu, F., Alamri, S., & Boeckx, C. (2017) · PLOS ONE · doi:10.1371/journal.pone.0185306 · Cited by 174 · see citing works
- Authors
- Stanley, C. E., & Kulathinal, R. J.
- Affiliations
- Temple University (US)
- Corresponding author
- Kulathinal, Rob J.
- ORCID
- Kulathinal, Rob J.
- Venue
- BMC Evolutionary Biology
- Published
- 2016-01-05
- Volume
- 16
- Issue
- 1
- Pages
- 6-6
- ISSN
- 1471-2148 (ISSN-L)
- PMC
- PMC4700609
- OpenAlex
- W2227053449
- Cited by
- 29
- References
- 92
- Citations by year
- 2025: 3 · 2024: 2 · 2022: 2 · 2021: 3 · 2020: 3 · 2019: 5 · 2018: 4 · 2017: 2 · 2016: 4 · 2015: 1
- FWCI
- 4.03
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Locations
- BMC Evolutionary Biology (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- TUScholarShare (Temple University) (submittedVersion, cc-by)
- Funders
- Directorate for Biological Sciences (1407006)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Evolution and Genetic Dynamics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic diversity and population structure
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic and phenotypic traits in livestock
- Keywords
- domestication, Drosophila melanogaster, relaxed selection, deleterious mutations, X-linked loci, extended haplotypes
- MeSH terms
- Alleles, Animals, Animals, Domestic, Animals, Laboratory, Animals, Wild, Drosophila melanogaster, Biological Evolution, Haplotypes, Genome, Polymorphism, Single Nucleotide
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