Titel (eng)

Rapid and biased evolution of canalization during adaptive divergence revealed by dominance in gene expression variability during Arctic charr early development

Autor*in

Quentin Jean-Baptiste Horta-Lacueva   University of Iceland / Lund University

Kalina Hristova Kapralova   University of Iceland

Benedikt Hallgrímsson   University of Calgary

Zophonías Oddur Jónsson   University of Iceland

Dagny A. V. Thorholludottir   University of Veterinary Medicine Vienna / University of Iceland

Verlag

Nature Portfolio

Beschreibung (eng)

Adaptive evolution may be influenced by canalization, the buffering of developmental processes from environmental and genetic perturbations, but how this occurs is poorly understood. Here, we explore how gene expression variability evolves in diverging and hybridizing populations, by focusing on the Arctic charr (Salvelinus alpinus) of Thingvallavatn, a classic case of divergence between feeding habitats. We report distinct profiles of gene expression variance for both coding RNAs and microRNAs between the offspring of two contrasting morphs (benthic/limnetic) and their hybrids reared in common conditions and sampled at two key points of cranial development. Gene expression variance in the hybrids is substantially affected by maternal effects, and many genes show biased expression variance toward the limnetic morph. This suggests that canalization, as inferred by gene expression variance, can rapidly diverge in sympatry through multiple gene pathways, which are associated with dominance patterns possibly biasing evolutionary trajectories and mitigating the effects of hybridization on adaptive evolution.

Sprache des Objekts

Englisch

Datum

2023

Rechte

Dieses Werk bzw. dieser Inhalt steht unter einer
CC BY 4.0 - Creative Commons Namensnennung 4.0 International Lizenz.

CC BY 4.0 International

http://creativecommons.org/licenses/by/4.0/

Klassifikation

Salvelinus-Alpinus; Morphological Variation; Fluctuating Asymmetry; Phenotypic Plasticity; Directional Selection; Stability; Population; Thingvallavatn; Pleiotropy; Ontogeny

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