Structural changes to the brood pouch of male pregnant seahorses (Hippocampus abdominalis) facilitate exchange between father and embryos

Dudley, Jessica S.; Hannaford, Philip Christopher; Dowland, Samson N.; Lindsay, Linda; Thompson, Michael B.; Murphy, Christopher R.; Dyke, James U. Van; Whittington, Camilla M.

doi:10.1016/j.placenta.2021.09.002

Cited by 22 publications

(12 citation statements)

References 52 publications

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“…obs. ), and yet nutrients and respiratory gases are transported across a placenta in some species [52,146]. The morphological specializations at the attachment sites in the parent suggest that some physiological feto-paternal exchange occurs, but the biology of such placentae is largely unexplored.…”

Section: Other Putative Placentae At Embryonic Attachment Sitesmentioning

confidence: 99%

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Embryonic specializations for vertebrate placentation

Whittington

Buddle

Griffith

et al. 2022

Phil. Trans. R. Soc. B

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The vertebrate placenta, a close association of fetal and parental tissue for physiological exchange, has evolved independently in sharks, teleost fishes, coelacanths, amphibians, squamate reptiles and mammals. This transient organ forms during pregnancy and is an important contributor to embryonic development in both viviparous and oviparous, brooding species. Placentae may be involved in transport of respiratory gases, wastes, immune molecules, hormones and nutrients. Depending on the taxon, the embryonic portion of the placenta is comprised of either extraembryonic membranes (yolk sac or chorioallantois) or temporary embryonic tissues derived via hypertrophy of pericardium, gill epithelium, gut, tails or fins. These membranes and tissues have been recruited convergently into placentae in several lineages. Here, we highlight the diversity and common features of embryonic tissues involved in vertebrate placentation and suggest future studies that will provide new knowledge about the evolution of pregnancy. This article is part of the theme issue ‘Extraembryonic tissues: exploring concepts, definitions and functions across the animal kingdom’.

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Section: Other Putative Placentae At Embryonic Attachment Sitesmentioning

confidence: 99%

“…[150]). However, even respiratory gas exchange may be limited to the placentae of embryos incubated in enclosed spaces and could be less important in oviparous brooders where eggs are partially exposed to the external environment [2,146].…”

Section: Common Features Of Vertebrate Placentaementioning

confidence: 99%

Embryonic specializations for vertebrate placentation

Whittington

Buddle

Griffith

et al. 2022

Phil. Trans. R. Soc. B

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“…

Pregnancy encompasses zygote implantation, embryonic retention, growth, and ends with the release of offspring at parturition. Viviparity has evolved independently more than 150 times across vertebrate species, with phylogenetic studies supporting the notion that gestation holds oviparous roots (Blackburn, 2015;Dudley et al, 2021). A culmination of morphological and physiological innovations that provide progeny with nutrient support, gas exchange and osmoregulation have evolved to shape this

…”

mentioning

confidence: 99%

Immunological tolerance in the evolution of male pregnancy

et al. 2022

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Pregnancy encompasses zygote implantation, embryonic retention, growth, and ends with the release of offspring at parturition. Viviparity has evolved independently more than 150 times across vertebrate species, with phylogenetic studies supporting the notion that gestation holds oviparous roots (Blackburn, 2015;Dudley et al., 2021). A culmination of morphological and physiological innovations that provide progeny with nutrient support, gas exchange and osmoregulation have evolved to shape this

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“…These results suggest that subclade 1 patristacin genes are commonly localized in the epithelium of both platyfish and cichlid. In the pregnant seahorse brood pouch, a layer‐like acellular structure, probably mucus, is present (Dudley et al, 2021). A viscous fluid that is alcian blue and PAS‐positive is also present in the lumen of the pipefish brood pouch (Watanabe et al, 2000).…”

Section: Discussionmentioning

confidence: 99%

Molecular evolution of patristacin genes in teleosts based on the genome survey

et al. 2023

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During the evolution of astacin metalloprotease family genes, gene duplication occurred, especially in the lineage of teleosts, in which several types of astacins containing six conserved cysteines (c6ast) emerged. One of them is patristacin, originally found in syngnathid fishes, such as pipefishes and seahorses. Patristacin is expressed in the brood pouch and is present on the same chromosome as other c6ast (pactacin and nephrosin) genes. We first surveyed all the genes from 33 teleost species using a genome database, and characterized the genes by phylogenetic analysis. Pactacin and nephrosin gene homologs were found from all the examined species with only few exceptions, while patristacin gene homologs were found from only several lineages. The patristacin gene homologs were found as multicopy genes in most species of Percomorpha, one of the diverged groups in teleosts. Further diversification of the gene occurred during the evolution of Atherinomorphae, one of the groups in Percomorpha. Fishes of Atherinomorphae possess two types of patristacin, belonging to subclades 1 and 2. Among the Atherinomorpha, we chose the southern platyfish to examine the patristacin gene expression. Platyfish possess eight patristacin gene homologs, called XmPastn1, 2, 3, 4, 5, 7, 10, and 11. Of these genes, only XmPastn2 belongs to subclade 1, while the other seven belong to subclade 2. Only XmPastn2 showed strong expression in several organs of adult platyfish, as observed in reverse‐transcription polymerase chain reaction of RNA extracts. Cells expressing XmPastn2 were predominantly mucus‐secreting cells found in epidermis around the jaw, as revealed by in‐situ hybridization. This result suggests that XmPastn2 is secreted and may contribute to mucus formation or secretion.

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Structural changes to the brood pouch of male pregnant seahorses (Hippocampus abdominalis) facilitate exchange between father and embryos

Cited by 22 publications

References 52 publications

Embryonic specializations for vertebrate placentation

Embryonic specializations for vertebrate placentation

Immunological tolerance in the evolution of male pregnancy

Molecular evolution of patristacin genes in teleosts based on the genome survey

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