Sex Determination and Control in Eels

Qu, Xiancheng

doi:10.1002/9781119127291.ch40

Cited by 4 publications

(2 citation statements)

References 105 publications

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“…So far, the regulator mechanism of natural sex reversal remains limited. Most studies mainly focus on sex differentiation-related genes in the gonad, such as gonadal soma derived factor (gsdf ), anti-Müllerian hormone (amh), SRY-related high-mobility group box 9 (sox9), doublesex-and mab-3-related transcription factor-1 (dmrt1), forkhead protein L2 (foxl2), and so on [26,27]. In this present study, we obtained the fulllength cDNA and genomic sequences of trh at first, and detected trh mRNA distribution in various tissues in rice field eel.…”

Section: Introductionmentioning

confidence: 99%

Molecular Cloning and Expression Analysis of Thyrotropin-Releasing Hormone, and Its Possible Role in Gonadal Differentiation in Rice Field eel Monopterus albus

Feng

et al. 2022

Animals

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Rice field eel (Monopterus albus), a protogynous hermaphrodite fish, is a good model for the research of sex determination and gonadal differentiation in teleosts. In this study, we cloned the full-length cDNA sequence of trh, which encoded a predicted protein with 270 amino acids. Trh mainly expressed in the brain, followed by the ovary, testis, muscle and pituitary, and had low levels in other peripheral tissues. During natural sex reversal, trh mRNA expression levels exhibited a significant increase at the late intersexual stage in the hypothalamus. In the gonad, trh mRNA expression levels showed a trend of increase followed by decrease, and only increased significantly at the middle intersexual stage. No matter static incubation or intraperitoneal (IP) injection, TRH had no significant effect on trh and thyroid-stimulating hormone βsubunit (tshβ) mRNA expression levels, and serum T3, T4 and TRH release. After static incubation of ovarian fragments by TRH, the expression of gonadal soma derived factor (gsdf) was up-regulated significantly at both the doses of 10 and 100 nM. IP injection of TRH stimulated the expression of gsdf, and inhibited the expression of ovarian aromatase gene (cyp19a1a), accompanied by the increase of serum 11-KT levels. The results indicated that TRH may play a novel role in gonadal differentiation by the regulation of gonadal differentiation-related gene expression and sex steroid hormone secretion in rice field eel.

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Section: Introductionmentioning

confidence: 99%

Molecular Cloning and Expression Analysis of Thyrotropin-Releasing Hormone, and Its Possible Role in Gonadal Differentiation in Rice Field eel Monopterus albus

Feng

et al. 2022

Animals

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“…Monopterus albus is a sex reversal fish with a unique life history (Liu, 1944;Mazzoni et al, 2018;Qu, 2018). It starts the reproductive cycle as a functional female.…”

Section: Introductionmentioning

confidence: 99%

Population genetics of swamp eel in the Yangtze River: comparative analyses between mitochondrial and microsatellite data provide novel insights

Zhou

Yong

Jiang

et al. 2020

PeerJ

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The swamp eel (Monopterus albus) is a typical sex reversal fish with high economic value. Several phylogeographic studies have been performed using various markers but comparative research between mitochondrial and nuclear markers is rare. Here, a fine-scale study was performed across six sites along the Yangtze River including three sites on the main stem and three sites from tributaries. A total of 180 swamp eel individuals were collected. Genetic structure and demographic history were explored using data from two mitochondrial genes and eight microsatellite loci. The results revealed the samples from tributary sites formed three separate clades which contained site-specific lineages. Geographic isolation and the habitat patchiness caused by seasonal cutoff were inferred to be the reasons for this differentiation. Strong gene flow was detected among the sites along the main stem. Rapid flow of the river main stem may provide the dynamic for the migration of swamp eel. Interestingly, the comparative analyses between the two marker types was discordant. Mitochondrial results suggested samples from three tributary sites were highly differentiated. However, microsatellite analyses indicated the tributary samples were moderately differentiated. We conclude this discordance is mainly caused by the unique life history of sex reversal fish. Our study provides novel insights regarding the population genetics of sex reversal fish.

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Environmental Epigenetics in Fish

Shen

Wang

2023

Epigenetics in Aquaculture

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Sex Determination and Control in Eels

Cited by 4 publications

References 105 publications

Molecular Cloning and Expression Analysis of Thyrotropin-Releasing Hormone, and Its Possible Role in Gonadal Differentiation in Rice Field eel Monopterus albus

Molecular Cloning and Expression Analysis of Thyrotropin-Releasing Hormone, and Its Possible Role in Gonadal Differentiation in Rice Field eel Monopterus albus

Population genetics of swamp eel in the Yangtze River: comparative analyses between mitochondrial and microsatellite data provide novel insights

Environmental Epigenetics in Fish

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