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Genome Wide Association Studies of Early Fitness Traits in Drosophila melanogaster Unveil Plasticity and Decoupling of Different Aspects of Phenotype

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Abstract

Great efforts have been sustained to explain the relationships between genotype and phenotype for developmental fitness traits through the study of their genetic architecture. However, crucial aspects of functional architecture influencing the maintenance of genetic variability, and thus the capacity for evolutionary change, are still unexplored. Here we performed Genome-wide Association Studies for phenotypic variability, plasticity and within-line canalization at two temperatures for Larval Developmental Time (LDT), Pupal Developmental Time (PDT), Larval Viability (LV), Pupal Viability (PV), and Pupal Height (PH) in lines derived from a natural population of Drosophila melanogaster. Results suggest changes in genetic networks linked to resource acquisition and allocation underlying variability for all traits. However, we found low genetic pleiotropy between traits and for different aspects of phenotype (means, plasticity, within-line canalization) within each trait. Their genetic bases were also temperature-specific: we found no variants showing an effect for the same trait at both temperatures. Moreover, a genetic decoupling between larval and pupal traits was confirmed, as there were no candidate variants significantly associated to phenotypic variability for the same trait across stages. We found evidence of genetic antagonistic pleiotropy for several loci affecting larval and pupal traits. The high degree of modularity at various levels would allow for the independent evolution of distinct aspects of the phenotype in different environments and ontogenetic stages. This may explain why genetic variation for these adaptive traits is not extinguished in natural populations and may entail important implications regarding evolvability.

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All data generated or analyzed during this study are included or cited in this article and its supplementary information files.

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Acknowledgements

We thank Trudy Mackay (Clemson Center for Human Genetics, Greenwood, SC, USA) for providing us with some of the lines used in this work. This work was supported by grants PICT-2012-0640 and PICT-2016-2256 from Agencia Nacional de Promoción Científica y Tecnológica (FONCyT, PICT) and PIP 112-201101-00717 from Consejo Nacional de Ciencia y Técnica (CONICET).

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MAPZ: collected data, performed analyses and wrote the main manuscript text. JM: collected data and performed analyses. VC: collected data and performed analyses. IS collected data and performed analyses. JJF: designed and directed this study, collected data and performed analyses. All authors reviewed and approved the manuscript.

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Correspondence to María Alejandra Petino Zappala.

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Petino Zappala, M.A., Mensch, J., Carreira, V. et al. Genome Wide Association Studies of Early Fitness Traits in Drosophila melanogaster Unveil Plasticity and Decoupling of Different Aspects of Phenotype. Evol Biol 51, 69–81 (2024). https://doi.org/10.1007/s11692-023-09619-y

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  • DOI: https://doi.org/10.1007/s11692-023-09619-y

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