Cited by 99Neuroendocrine regulation and behaviorNeuropeptides and Animal PhysiologyDevelopmental Biology and Gene Regulation

Molecular evolution of fish neurohypophysial hormones: neutral and selective evolutionary mechanisms

Acher, Roger·1996·General and Comparative Endocrinology

Abstract

Chemical identification of neurohypophysial hormones from about 80 vertebrate species reveals that two evolutionary lineages can be traced in bony vertebrates, a vasopressin-like hormone line and an oxytocin-like hormone line, which were derived from the duplication of an ancestral gene that may have been present in agnathans. All of the 13 neurohypophysial hormones are built in the same structural pattern, namely, a nonapeptide with a disulfide bridge linking half-cystines in positions 1 and 6. There is a striking evolutionary stability in bony vertebrates since virtually all species belonging to a given class are endowed with the same peptides. In contrast, in cartilaginous fishes, the oxytocin-like hormone displays a great diversity. Six distinct peptides are characterized in this group. The proposed hypothesis is that the stability in primary structure in bony vertebrates is due to selective pressure. This selective pressure is associated with an ion-based osmoregulation, whereas in Chondrichthyes the occurrence of an urea-based osmoregulation has relieved the hormones from the control of ionic homeostasis. Variations in primary structures in cartilaginous fishes are regarded as relevant to the neutral evolution as defined by Kimura. According to this concept, oxytocin of placental mammals results from selective evolution, whereas the same molecule found in ratfish proceeds from random genetic drift.

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Crossref · 10.1006/gcen.1996.0057

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  • The OT lineage is presumed to have evolutionary origins in reproductive function, while the AVP lineage is presumed to have origins in the regulation of fluid homeostasis.

    “The OT lineage (isotocin-mesotocin-oxytocin) is presumed to have evolutionary origins in the service of reproductive function, while the AVP lineage (vasotocin-vasopressin) is presumed to have origins in the regulation of fluid homeostasis”

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Authors
Acher, R.
Affiliations
Université Paris Cité (FR)
Corresponding author
Acher, Roger
Venue
General and Comparative Endocrinology
Publisher
Elsevier BV
Published
1996-05
Volume
102
Issue
2
Pages
157-172
ISSN
0016-6480 (ISSN-L)
OpenAlex
W2074709477
Cited by
99
References
0
Citations by year
2025: 4 · 2023: 1 · 2022: 5 · 2021: 3 · 2020: 4 · 2019: 3 · 2018: 5 · 2017: 1 · 2016: 2 · 2015: 4 · 2014: 2 · 2013: 3 · 2012: 6
FWCI
8.02
Type
journal article
Language
en
Open access
closed
Locations
  • General and Comparative Endocrinology (publishedVersion)
  • PubMed (publishedVersion)
Funders
Centre National de la Recherche Scientifique
Topics
  • Social Sciences › Psychology › Social Psychology › Neuroendocrine regulation and behavior
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuropeptides and Animal Physiology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Developmental Biology and Gene Regulation
Keywords
neurohypophyseal hormones, vasopressin, oxytocin, molecular evolution, gene duplication, Chondrichthyes, osmoregulation, ion homeostasis, neutral evolution, selection pressure, disulfide bonds, ratfish, placental mammals
MeSH terms
Animals, Fishes, Pituitary Gland, Posterior, Pituitary Hormones, Evolution, Molecular

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