期刊
GENERAL AND COMPARATIVE ENDOCRINOLOGY
卷 264, 期 -, 页码 78-83出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ygcen.2017.09.013
关键词
Chondrichthyes; Evolution; Vertebrates; Metabolism; Stress; Reproduction
资金
- Canadian Natural Sciences and Engineering Research Council (NSERC)
- NSERC Graduate Scholarship
The cartilaginous fishes (Class Chondrichthyes) comprise two morphologically distinct subclasses; Elasmobranchii and Holocephali. Evidence indicates early divergence of these subclasses, suggesting monophyly of their lineage. However, such a phylogenetic understanding is not yet developed within two highly conserved peptide lineages, GnRH and CRF. Various GnRH forms exist across the Chondrichthyes. Although 4-7 immunoreactive forms have been described in Elasmobranchii, only one has been elucidated in Holocephali. In contrast, Chondrichthyan CRF phylogeny follows a pattern more consistent with vertebrate evolution. For example, three forms are expressed within the lamprey, with similar peptides present within the genome of the Callorhinchus milii, a holocephalan. Although these findings are consistent with recent evidence regarding the phylogenetic age of Chondrichthyan lineages, CRF evolution in vertebrates remains elusive. Assuming that the Elasmobranchii and Holocephali are part of a monocladistic Glade within the Chondrichthyes, we interpret the findings of GnRH and CRF to be products of their respective lineages. Crown Copyright (C) 2017 Published by Elsevier Inc. All rights reserved.
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