Juvenile corals inherit mutations acquired during their parent’s lifespan


SOCIETY FOR INTEGRATIVE AND COMPARATIVE BIOLOGY
2021 VIRTUAL ANNUAL MEETING (VAM)
January 3 – Febuary 28, 2021

Meeting Abstract


50-5  Sat Jan 2  Juvenile corals inherit mutations acquired during their parent’s lifespan Vasquez-Kuntz, K; Kitchen, S; Conn, T; Vohsen, S; Chan, A; Vermeij, MJA; Page, C; Marhaver, K; Baums, IB*; Pennsylvania State University; Pennsylvania State University; Pennsylvania State University; Pennsylvania State University; Pennsylvania State University; CARMABI Foundation; Mote Marine Laboratory; CARMABI Foundation; Pennsylvania State University baums@psu.edu

Repeated coral bleaching events represent a strong selective force that is changing the genetic composition of surviving coral populations. Successful sexual reproduction of these survivors is the most likely means of adaptation. However, the dominant mode of reproduction in corals is often asexual, e.g., via breakage of pieces of the colony. In this way, coral genets can persist for thousands of years while accumulating post-embryonic mutations. We posit that this pool of mutations may be an alternate mechanism of adaptation, that is, if they are heritable. Analysis of genetic marker inheritance (Microsatellites and SNPs, validated via RFLPs) demonstrate that Elkhorn coral (Acropora palmata) colonies transfer post-embryonic mutations to the next generation. Larvae that shared a post-embryonic mutation with their parent were almost always produced via parthenogenesis or selfing and thus uniparental in origin. Hundreds of these larvae developed and grew normally. The discovery of uniparental larvae harboring post-embryonic mutations means that these mutations have the potential for much broader dispersal compared to mutations that are spread via fragmentation. As sexual reproduction continues to decline in the Caribbean, production of larvae carrying post-embryonic mutations may provide an alternative route for adaptation. The discovery of inheritance of post-embryonic mutations in an animal challenges our general understanding of animal adaptation and prompts a deeper examination the role of post-embryonic mutations in modular animals.

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