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Genetic basis for the evolution of pelvic-fin brooding, a new mode of reproduction, in a Sulawesian fish

Citation

Montenegro, Javier et al. (2022), Genetic basis for the evolution of pelvic-fin brooding, a new mode of reproduction, in a Sulawesian fish, Dryad, Dataset, https://doi.org/10.5061/dryad.v6wwpzgwz

Abstract

Modes of reproduction in animals are diverse, with different modes having evolved independently in multiple lineages across a variety of taxa. However, an understanding of the genomic change driving the transition between different modes of reproduction is limited. Several ricefishes (Adrianichthyidae) on the island of Sulawesi have a unique mode of reproduction called “pelvic-fin brooding,” wherein females carry externally fertilized eggs until hatching using their pelvic fins. Phylogenomic analysis demonstrated pelvic-fin brooders to have evolved at least twice in two distant clades of the Adrianichthyidae. We investigated the genetic architecture of the evolution of this unique mode of reproduction. Morphological analyses and laboratory observations revealed that females of pelvic-fin brooders have longer pelvic fins and a deeper abdominal concavity, and that they can carry an egg clutch for longer than non-brooding adrianichthyids, suggesting that these traits play important roles in this reproductive mode. Quantitative trait locus mapping using a cross between a pelvic-fin brooder Oryzias eversi and a non-brooding O. dopingdopingensis reveals different traits involved in pelvic-fin brooding to be controlled by different loci on different chromosomes. Genomic analyses of admixture detected no signatures of introgression between two lineages with pelvic-fin brooders, indicating that introgression is unlikely to be responsible for repeated evolution of pelvic-fin broodingThese findings suggest that multiple independent mutations may have contributed to the convergent evolution of this novel mode of reproduction.

Funding

Japan Society for the Promotion of Science, Award: KAKENHI 16F16392

Japan Society for the Promotion of Science, Award: KAKENHI 19K16203

Japan Society for the Promotion of Science, Award: KAKENHI 19K16232

Japan Society for the Promotion of Science, Award: KAKENHI 17H01675

Japan Science and Technology Corporation, Award: CREST JPMJCR20S2

The University of the Ryukyus Research Project Promotion Grant, Award: Strategic Research Grant

Spatiotemporal Genomics Project promoted by University of the Ryukyus

NIG collaborative grant (B)