Role of elasmobranchs and holocephalans in understanding peptide evolution in the vertebrates: Lessons learned from gonadotropin releasing hormone (GnRH) and corticotropin releasing factor (CRF) phylogenies.

Autor: Lovejoy DA; Department of Cell and Systems Biology, University of Toronto, Toronto, Ontario, Canada. Electronic address: david.lovejoy@utoronto.ca., Michalec OM; Department of Cell and Systems Biology, University of Toronto, Toronto, Ontario, Canada., Hogg DW; Department of Cell and Systems Biology, University of Toronto, Toronto, Ontario, Canada., Wosnick DI; Department of Cell and Systems Biology, University of Toronto, Toronto, Ontario, Canada.
Jazyk: angličtina
Zdroj: General and comparative endocrinology [Gen Comp Endocrinol] 2018 Aug 01; Vol. 264, pp. 78-83. Date of Electronic Publication: 2017 Sep 19.
DOI: 10.1016/j.ygcen.2017.09.013
Abstrakt: 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 clade within the Chondrichthyes, we interpret the findings of GnRH and CRF to be products of their respective lineages.
(Crown Copyright © 2017. Published by Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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