Vitellogenin of Fujian oyster, Crassostrea angulata: Synthesized in the ovary and controlled by estradiol-17β

Ni, Jianbin; Zeng, Zhen; Kong, Dezheng; Lin, Hui; Huang, Heqing; Ke, Caihuan

doi:10.1016/j.ygcen.2014.03.034

Cited by 32 publications

(19 citation statements)

References 77 publications

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“…Our results are consistent with those reported for the scallop Chlamys farreri (Qin et al 2012) and the Fujian oyster Crassostrea angulata (Ni et al 2014). Ni et al (2014) described the stages of oyster ovarian development in detail as follows: (1) maturation stage, when ovaries accumulate nutrients for oogenesis, and mRNA is abundant due to active Vg gene expression to promote Vg protein synthesis, yolk intake, and nutrient accumulation in oocytes; (2) ripeness stage, when oocytes grow and accumulate yolk, decreasing the demand for yolk protein and Vg gene expression; and (3) partially spent stage, when ovaries stop developing and before new oogonium inception so that Vg expression levels are very low (Boutet et al 2008;Zheng et al 2012). Davis et al (2008) reported that endogenous in females and exogenous Vg in 17β-estradiol (E 2 )-treated males downregulate GH/IGF-1 axis support of vitellogenesis in the liver.…”

Section: Discussionsupporting

confidence: 93%

Role of the insulin-like growth factor system in gonad sexual maturation in Pacific oyster Crassostrea gigas

Moon

Choi

2020

Fish Aquatic Sci

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Background: The IGF system plays important roles in controlling growth, development, reproduction, and aging of organisms. Methods: To estimate maturation of the Pacific oyster Crassostrea gigas, we investigated the expression of insulinlike growth factor (IGF) system components and sex-specific genes. To determine the role of the IGF system in the growth and spawning period of female and male oysters, we examined mRNA expression levels of the C. gigas insulin receptor-related receptor (CIR), IGF binding protein complex acid labile subunit (IGFBP_ALS), and molluscan insulin-related peptide (MIP), as well as those of vitellogenin (Vg) and receptor-type guanylate cyclase (Gyc76C) in gonads of C. gigas collected between April and October, when sex can be determined visually in this species. Results: We found that MIP, IGFBP_ALS, and CIR mRNA expression levels were dependent on sex and month and were greater in males than in females. CIR and Vg mRNA expression levels were very similar among females, whereas IGF system components and Gyc76C were very similarly expressed among males. The highest expression values were observed in May, when oysters are mature; CIR and Vg mRNA expression levels were highest in females, and those of MIP, IGFBP_ALS, CIR, and Gyc76C were highest in males. Interestingly, we observed a 1:1 proportion of females to males during this period. Conclusion: Our results suggest that IGF system components, as well as Vg and Gyc76C, are associated with sexual maturation in C. gigas.

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Section: Discussionsupporting

confidence: 93%

Role of the insulin-like growth factor system in gonad sexual maturation in Pacific oyster Crassostrea gigas

Moon

Choi

2020

Fish Aquatic Sci

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“…In general, the yolk protein vitelline is synthesized from its precursor VTG and is accumulated in oocytes in most oviparous animals [40]. Although VTG is known to be synthesized in extraovarian tissues such as the fat body of insects, the hepatopancreas of decapod crustaceans, and the liver of vertebrates, many reports have suggested that the ovary can be a single source of VTG protein in mollusks [41,42,43,44,45,46,47,48]. The transcription factor FOXL2 is preferentially expressed in the ovary and plays an important role in ovarian determination and development in vertebrates [49].…”

Section: Resultsmentioning

confidence: 99%

Alternative Splicing Profile and Sex-Preferential Gene Expression in the Female and Male Pacific Abalone Haliotis discus hannai

Kim

Rhee

Kim

et al. 2017

Genes

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In order to characterize the female or male transcriptome of the Pacific abalone and further increase genomic resources, we sequenced the mRNA of full-length complementary DNA (cDNA) libraries derived from pooled tissues of female and male Haliotis discus hannai by employing the Iso-Seq protocol of the PacBio RSII platform. We successfully assembled whole full-length cDNA sequences and constructed a transcriptome database that included isoform information. After clustering, a total of 15,110 and 12,145 genes that coded for proteins were identified in female and male abalones, respectively. A total of 13,057 putative orthologs were retained from each transcriptome in abalones. Overall Gene Ontology terms and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathways analyzed in each database showed a similar composition between sexes. In addition, a total of 519 and 391 isoforms were genome-widely identified with at least two isoforms from female and male transcriptome databases. We found that the number of isoforms and their alternatively spliced patterns are variable and sex-dependent. This information represents the first significant contribution to sex-preferential genomic resources of the Pacific abalone. The availability of whole female and male transcriptome database and their isoform information will be useful to improve our understanding of molecular responses and also for the analysis of population dynamics in the Pacific abalone.

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“…The acinal wall cells have been proposed in some molluscs to be a site for synthesizing and providing yolk protein. In these cells, vitellogenin, a precursor of yolk protein, is produced and probably transported to the maturing oocytes through the extracellular space [ 28 ]. The C. okutanii symbiont may be transported from the acinal wall cells to the oocyte through the yolk transport route during oocyte maturation, even though the final localization of the yolk protein (in the oocyte) and the symbiont (on the outer surface of the oocyte) are different.…”

Section: Discussionmentioning

confidence: 99%

Surfing the vegetal pole in a small population: extracellular vertical transmission of an 'intracellular' deep-sea clam symbiont

Ikuta

Igawa

Tame³

et al. 2016

R. Soc. open sci.

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Symbiont transmission is a key event for understanding the processes underlying symbiotic associations and their evolution. However, our understanding of the mechanisms of symbiont transmission remains still fragmentary. The deep-sea clam Calyptogena okutanii harbours obligate sulfur-oxidizing intracellular symbiotic bacteria in the gill epithelial cells. In this study, we determined the localization of their symbiont associating with the spawned eggs, and the population size of the symbiont transmitted via the eggs. We show that the symbionts are located on the outer surface of the egg plasma membrane at the vegetal pole, and that each egg carries approximately 400 symbiont cells, each of which contains close to 10 genomic copies. The very small population size of the symbiont transmitted via the eggs might narrow the bottleneck and increase genetic drift, while polyploidy and its transient extracellular lifestyle might slow the rate of genome reduction. Additionally, the extracellular localization of the symbiont on the egg surface may increase the chance of symbiont exchange. This new type of extracellular transovarial transmission provides insights into complex interactions between the host and symbiont, development of both host and symbiont, as well as the population dynamics underlying genetic drift and genome evolution in microorganisms.

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Vitellogenin of Fujian oyster, Crassostrea angulata: Synthesized in the ovary and controlled by estradiol-17β

Cited by 32 publications

References 77 publications

Role of the insulin-like growth factor system in gonad sexual maturation in Pacific oyster Crassostrea gigas

Role of the insulin-like growth factor system in gonad sexual maturation in Pacific oyster Crassostrea gigas

Alternative Splicing Profile and Sex-Preferential Gene Expression in the Female and Male Pacific Abalone Haliotis discus hannai

Surfing the vegetal pole in a small population: extracellular vertical transmission of an 'intracellular' deep-sea clam symbiont

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