Egg signals for triggering the acrosome reaction in starfish spermatozoa

Hoshi, Motonori; Amano, Tsuyoshi; Okita, Yoshihito; Okinaga, Tatsuyuki; Matsui, Taei

doi:10.1201/9781003077565-10

Cited by 7 publications

(4 citation statements)

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“…The ARIS1 gene of COTS encoded two additional conserved domains, FA58C and KD, suggested to be involved in the interaction of ARIS1 with other ARIS proteins in many taxa (Naruse et al, ). Although ARIS1 alone can initiate the acrosome reaction in sea stars in the laboratory, this reaction normally occurs only when ARIS1 is expressed together with ARIS2 and ARIS3 (Hoshi et al, ; Naruse et al, ). Glycosylated sites on ARIS proteins may play a role in the acrosome reaction of sea star sperm similar to the role of FSP in sea urchins.…”

Section: Discussionmentioning

confidence: 99%

Nonspecific expression of fertilization genes in the crown‐of‐thorns Acanthaster cf. solaris: Unexpected evidence of hermaphroditism in a coral reef predator

et al. 2020

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The characterization of gene expression in gametes has advanced our understanding of the molecular basis for ecological variation in reproductive success and the evolution of reproductive isolation. These advances are especially significant for ecologically important keystone predators such as the coral‐eating crown‐of‐thorns sea stars (COTS, Acanthaster) which are the most influential predator species in Indo‐Pacific coral reef ecosystems and the focus of intensive management efforts. We used RNA‐seq and transcriptome assemblies to characterize the expression of genes in mature COTS gonads. We described the sequence and domain organization of eight genes with sex‐specific expression and well known functions in fertilization in other echinoderms. We found unexpected expression of genes in one ovary transcriptome that are characteristic of males and sperm, including genes that encode the sperm‐specific guanylate cyclase receptor for an egg pheromone, and the sperm acrosomal protein bindin. In a reassembly of previously published RNA‐seq data from COTS testes, we found a complementary pattern: strong expression of four genes that are otherwise well known to encode egg‐specific fertilization proteins, including the egg receptor for bindin (EBR1) and the acrosome reaction‐inducing substance in the egg coat (ARIS1, ARIS2, ARIS3). We also found histological evidence of both eggs and sperm developing in the same gonad in several COTS individuals from a parallel study. These results suggest the occurrence of hermaphrodites, and the potential for reproductive assurance via self‐fertilization. Our findings have implications for management of COTS populations, especially in consideration of the large size and massive fecundity of these sea stars.

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Section: Discussionmentioning

confidence: 99%

Nonspecific expression of fertilization genes in the crown‐of‐thorns Acanthaster cf. solaris: Unexpected evidence of hermaphroditism in a coral reef predator

et al. 2020

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“…Taking advantage of the simple and unique body structures of marine invertebrates, many important findings were achieved at marine stations in physiology and cell/developmental biology. These include the developmental processes of marine invertebrates such as nemerteans and ctenophores (Yatsu, 1909;Komai, 1942), discovery of the acrosome reaction (Hoshi et al, 1994;Suzuki, 1995), discovery of tubulins from sperm flagella (Mohri and Hosoya, 1988), mechanical properties of the mitotic apparatus (Dan, 1984;Nakano and Hiramoto, 1988;Yoneda, 1988), cell fate and differentiation in ascidian embryos (Nishida and Stach, 2014), and hormonal regulation of oocyte maturation (Chiba, 2000). Many of the scientific findings at early stages of marine stations were published in Zoological Magazine, the previous incarnation of Zoological Science from the Zoological Society of Japan.…”

Section: Modern Zoology and Marine Stationsmentioning

confidence: 99%

JAMBIO and Its Coastal Organism Joint Surveys: Network of Marine Stations Explores Japanese Coastal Biota

2022

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“…In the middle of the last century, American scientist Dan carried out a research program on the fertilization of marine invertebrates at Misaki Marine Biological Station and discovered the biological significance of the changes, which introduced the term "acrosome reaction." The acrosome reaction «is the mechanism for spermatozoa to ensure a spatio-temporally matched exposure of devices essential for penetration through the egg coat and for subsequent fusion with egg plasma membrane [107]. Spawned eggs of starfish have two layers of acellular coats.…”

Section: Biogenesis and Biological Functions Of Asterosaponinsmentioning

confidence: 99%

Asterosaponins: Structures, Taxonomic Distribution, Biogenesis and Biological Activities

et al. 2020

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Asterosaponins are a class of steroid oligoglycosides isolated from starfish with characteristic structures and diverse biological activities. In this review, we have attempted to combine the most important data concerning asterosaponins and give a list of these secondary metabolites with their structural peculiarities. The purpose of this review is to provide a brief but as complete as possible principal information about their chemical structures, taxonomic distribution in the marine environment, distribution in different geographical areas and depths, some properties, biological activities, and functions. Some other rare steroid metabolites from starfish, closely related in structures and probably biogenesis to asterosaponins, are also discussed.

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Egg signals for triggering the acrosome reaction in starfish spermatozoa

Cited by 7 publications

References 0 publications

Nonspecific expression of fertilization genes in the crown‐of‐thorns Acanthaster cf. solaris: Unexpected evidence of hermaphroditism in a coral reef predator

Nonspecific expression of fertilization genes in the crown‐of‐thorns Acanthaster cf. solaris: Unexpected evidence of hermaphroditism in a coral reef predator

JAMBIO and Its Coastal Organism Joint Surveys: Network of Marine Stations Explores Japanese Coastal Biota

Asterosaponins: Structures, Taxonomic Distribution, Biogenesis and Biological Activities

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