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2017 ; 27
(5
): 729-732
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The Origin of Vertebrate Gills
#MMPMID28190727
Gillis JA
; Tidswell OR
Curr Biol
2017[Mar]; 27
(5
): 729-732
PMID28190727
show ga
Pharyngeal gills are a fundamental feature of the vertebrate body plan [1].
However, the evolutionary history of vertebrate gills has been the subject of a
long-standing controversy [2-8]. It is thought that gills evolved independently
in cyclostomes (jawless vertebrates-lampreys and hagfish) and gnathostomes (jawed
vertebrates-cartilaginous and bony fishes), based on their distinct embryonic
origins: the gills of cyclostomes derive from endoderm [9-12], while gnathostome
gills were classically thought to derive from ectoderm [10, 13]. Here, we
demonstrate by cell lineage tracing that the gills of a cartilaginous fish, the
little skate (Leucoraja erinacea), are in fact endodermally derived. This finding
supports the homology of gills in cyclostomes and gnathostomes, and a single
origin of pharyngeal gills prior to the divergence of these two ancient
vertebrate lineages.