Neurosecretion and hormonal control of reproduction in Annelida

M, Durchon

doi:10.1016/0016-6480(62)90094-1

Cited by 27 publications

(4 citation statements)

References 19 publications

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“…The third aspect is the striking and, in many respects, unique role of the systemic regulation of annelid regeneration and sexual maturation through neuroendocrine secretion [122][123][124]. In many annelids, gametes maturation is activated after an ablation of the cerebral brain (the source of the hormone), and the segment regeneration becomes impossible.…”

Section: Nervous Systemmentioning

confidence: 99%

Comparative Aspects of Annelid Regeneration: Towards Understanding the Mechanisms of Regeneration

Kostyuchenko

Kozin

2021

Genes

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The question of why animals vary in their ability to regenerate remains one of the most intriguing questions in biology. Annelids are a large and diverse phylum, many members of which are capable of extensive regeneration such as regrowth of a complete head or tail and whole-body regeneration, even from few segments. On the other hand, some representatives of both of the two major annelid clades show very limited tissue regeneration and are completely incapable of segmental regeneration. Here we review experimental and descriptive data on annelid regeneration, obtained at different levels of organization, from data on organs and tissues to intracellular and transcriptomic data. Understanding the variety of the cellular and molecular basis of regeneration in annelids can help one to address important questions about the role of stem/dedifferentiated cells and “molecular morphallaxis” in annelid regeneration as well as the evolution of regeneration in general.

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Section: Nervous Systemmentioning

confidence: 99%

Comparative Aspects of Annelid Regeneration: Towards Understanding the Mechanisms of Regeneration

Kostyuchenko

Kozin

2021

Genes

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“…Hormonal mechanisms effecting a separation between growth and reproduction have been demonstrated in nereids, and as in many other animals, the secretion of a juvenile hormone is involved. The supraesophageal ganglion, or brain, of nereids secretes a hormone or hormones which promote segment growth but inhibit maturation during the early stages of development (see reviews by Durchon, 1962;Clark, 1965;and Hauenschild, 1966). Immature nereids regenerate lost posterior segments.…”

mentioning

confidence: 99%

Endocrinology, Regeneration and Maturation in Nereis

Golding¹

1967

The Biological Bulletin

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“…In addition, since environmental factors such as lunar and/or tidal phase are important for controlling stolonization [30,31], it was hypothesized that hormones secreted from the brain might contribute to reproduction in annelids [32,33]. In syllids, it was also suggested that stolonization would be controlled by hormonal actions [34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Morphological, Histological and Gene-Expression Analyses on Stolonization in the Japanese Green Syllid, Megasyllis nipponica (Annelida, Syllidae)

Nakamura,

Oguchi,

Sato

et al. 2023

Preprint

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Benthic annelids belonging to the family Syllidae (Errantia, Phyllodocida) exhibit a unique reproduction mode called “schizogamy” or “stolonization”, in which the posterior body part filled with gametes detaches from the original body, as a reproductive unit (stolon) that autonomously swims and spawns. In this study, detailed developmental processes during stolonization were morphologically/histologically observed in Megasyllis nipponica. The results suggest that the stolon formation started with maturation of gonads, followed by the formation of a head ganglion in the anteriormost segment of the developing stolon. Then, the detailed stolon-specific structures such as stolon eyes and notochaetae were formed. Furthermore, expression profiles of genes involved in the anterior-posterior identity (Hox genes), head identification, germ-line, and hormone regulation were compared between anterior and posterior body parts during the stolonization process. The results reveal that, in the posterior body part, genes for gonadal development were up-regulated, followed by hormone-related genes and head-identification genes. Unexpectedly, Hox genes known to identify body parts along the anterior-posterior axis showed no significant temporal expression changes. Taken together, these findings suggest that during stolonization, gonad development induces the head formation of a stolon, without up-regulation of anterior Hox genes.

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Neurosecretion and hormonal control of reproduction in Annelida

Cited by 27 publications

References 19 publications

Comparative Aspects of Annelid Regeneration: Towards Understanding the Mechanisms of Regeneration

Comparative Aspects of Annelid Regeneration: Towards Understanding the Mechanisms of Regeneration

Endocrinology, Regeneration and Maturation in Nereis

Morphological, Histological and Gene-Expression Analyses on Stolonization in the Japanese Green Syllid, Megasyllis nipponica (Annelida, Syllidae)

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