Journal
PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES
Volume 288, Issue 1944, Pages -Publisher
ROYAL SOC
DOI: 10.1098/rspb.2020.2205
Keywords
Astyanax mexicanus; ectodysplasin; evolvability
Categories
Funding
- US National Science Foundation [IOS-1121855, IOS-1755305]
- Scientific Grant Agency of the Slovak Republic (VEGA) [1/0415/17, 1/0450/21]
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This study provides evidence for the influence of external or internal factors on morphological diversification during adaptive radiation, focusing on dental diversity in characiform fishes. Results suggest that differences in evolvability between lineages may lead to contrasting patterns of diversification, with implications for the retention of ancestral developmental potential.
Morphological diversification during adaptive radiation may depend on factors external or internal to the lineage. We provide evidence for the latter in characiform fishes (tetras and piranhas), which exhibit extensive dental diversity. Phylogenetic character mapping supported regain of lost teeth as contributing to this diversity. To test for latent potential for dentition that would facilitate its evolutionary expansion, we overexpressed a tooth initiation signal, the tumour necrosis factor pathway ligand ectodysplasin, in a model characiform, the Mexican tetra (Astyanax mexicanus). This manipulation resulted in extensive ectopic dentition, in contrast with its previously reported limited effect in the zebrafish (Danio rerio). Tooth location in the order Cypriniformes, to which the zebrafish belongs, is much more restricted than in characiforms, a pattern that may be explained by differences in the retention of ancestral developmental potential. Our results suggest that differences in evolvability between lineages may lead to contrasting patterns of diversification.
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