Gene duplication increases the number of genes through evolution
Extensive genomic and evolutionary evidence consistently shows that gene duplication is a primary driver of gene family expansion and the generation of new genes over evolutionary time.
The retrieved literature universally supports the foundational evolutionary biology principle that gene duplication increases gene number and serves as the primary source of genetic novelty. Multiple studies across yeast, fungi, plants, and animals document how whole-genome and segmental duplications expand gene repertoires and fuel functional divergence through subfunctionalization and neofunctionalization. There is no evidence refuting this consensus.
Xionglei He, Jianzhi Zhang. Rapid Subfunctionalization Accompanied by Prolonged and Substantial Neofunctionalization in Duplicate Gene Evolution. 2005. https://doi.org/10.1534/genetics.104.037051
States that gene duplication is the primary source of new genes and demonstrates how enormous numbers of new functions originate via duplication.
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Kevin P Byrne, Kenneth H Wolfe. Consistent Patterns of Rate Asymmetry and Gene Loss Indicate Widespread Neofunctionalization of Yeast Genes After Whole-Genome Duplication. 2007. https://doi.org/10.1534/genetics.106.066951
Investigates whole-genome duplication in yeast and shows how duplicated gene pairs undergo divergence and neofunctionalization.
Marina Marcet-Houben, Giuseppe Marceddu, Toni Gabaldón. Phylogenomics of the oxidative phosphorylation in fungi reveals extensive gene duplication followed by functional divergence. 2009. https://doi.org/10.1186/1471-2148-9-295
Reveals that duplications in respiratory proteins have been common and fundamental to the evolution of fungal metabolic pathways.
Saccone S, Brancato D, Bruno F, Coniglio E, Sturiale V, Federico C. Origin and Evolution of Genes in Eukaryotes: Mechanisms, Dynamics, and Functional Implications.. 2025. https://doi.org/10.3390/genes16060702
Explains that gene duplication is a principal mechanism underlying gene emergence, molecular innovation, and evolutionary complexity in eukaryotes.
Evgeny Fraimovitch, Tzachi Hagai. Promoter architecture links gene duplication with transcriptional divergence. 2021. https://doi.org/10.1101/2021.07.03.450995
Links gene duplication directly to the expansion of gene families and the capacity for sub- and neo-functionalization.
Wu N, Feng Y, Ning X, Yao D. Pan-Genome Analysis Reveals Evolutionary Dynamics and Functional Divergence of the <i>NAC</i> Gene Family in Soybean.. 2026. https://doi.org/10.3390/plants15132010
Indicates that whole-genome and segmental duplication are predominant drivers of gene family expansion and copy number variation in plants.
Masonbrink RE, Sharma SP, Satheesh V, Badaczewska-Dawid A, Chudalayandi S, Alt D, Boggiatto P, Putz E, Severin AJ, Olsen SC. Recurrent Duplication of the REST–NOA1 Locus Reveals a Hotspot of Regulatory Evolution Across Even-Toed Ungulates. 2026. https://doi.org/10.64898/2026.06.22.733815
Demonstrates that gene duplication serves as a major source of evolutionary novelty and genomic expansion across mammalian lineages.
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