Resegmentation is an ancestral feature of the gnathostome vertebral skeleton.

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2020
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Abstract
The vertebral skeleton is a defining feature of vertebrate animals. However, the mode of vertebral segmentation varies considerably between major lineages. In tetrapods, adjacent somite halves recombine to form a single vertebra through the process of 'resegmentation'. In teleost fishes, there is considerable mixing between cells of the anterior and posterior somite halves, without clear resegmentation. To determine whether resegmentation is a tetrapod novelty, or an ancestral feature of jawed vertebrates, we tested the relationship between somites and vertebrae in a cartilaginous fish, the skate (). Using cell lineage tracing, we show that skate trunk vertebrae arise through tetrapod-like resegmentation, with anterior and posterior halves of each vertebra deriving from adjacent somites. We further show that tail vertebrae also arise through resegmentation, though with a duplication of the number of vertebrae per body segment. These findings resolve axial resegmentation as an ancestral feature of the jawed vertebrate body plan.
Reference Key
criswell2020resegmentationelife Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Criswell, Katharine E;Gillis, J Andrew;
Journal eLife
Year 2020
DOI
10.7554/eLife.51696
URL
Keywords
Segmentation developmental biology evolution vertebrae evolutionary biology axial skeleton chondrichthyan somites

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