4 Sex Control and Sex Reversal in Fish Under Natural Conditions

Chan, Siu-Hong; Yeung, Wsb

doi:10.1016/s1546-5098(08)60304-0

Cited by 86 publications

(73 citation statements)

References 93 publications

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“…The Sox9 gene is the major gene that controls the development of testis in vertebrates. The Sox9 gene showed high expression levels in testes compared with ovaries in several species, such as rainbow trout (54), half smooth tongue sole (10), and Monopterus albus (73,74). Expression profile detection showed that the Sox9 gene is highly expressed in the brain, pituitary gland, and male gonad.…”

Section: Discussionmentioning

confidence: 99%

Discovery and identification of candidate sex-related genes based on transcriptome sequencing of Russian sturgeon (Acipenser gueldenstaedtii) gonads

Chen

Xia²,

Shao

et al. 2016

Physiological Genomics

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Discovery and identification of candidate sex-related genes based on transcriptome sequencing of Russian sturgeon (Acipenser gueldenstaedtii) gonads. Physiol Genomics 48: 464 -476, 2016. First published May 6, 2016 doi:10.1152/physiolgenomics.00113.2015.-As the Russian sturgeon (Acipenser gueldenstaedtii) is an important food and is the main source of caviar, it is necessary to discover the genes associated with its sex differentiation. However, the complicated life and maturity cycles of the Russian sturgeon restrict the accurate identification of sex in early development. To generate a first look at specific sex-related genes, we sequenced the transcriptome of gonads in different development stages (1, 2, and 5 yr old stages) with next-generation RNA sequencing. We generated Ͼ60 million raw reads, and the filtered reads were assembled into 263,341 contigs, which produced 38,505 unigenes. Genes involved in signal transduction mechanisms were the most abundant, suggesting that development of sturgeon gonads is under control of signal transduction mechanisms. Differentially expressed gene analysis suggests that more genes for protein synthesis, cytochrome c oxidase subunits, and ribosomal proteins were expressed in female gonads than in male. Meanwhile, male gonads expressed more transposable element transposase, reverse transcriptase, and transposase-related genes than female. In total, 342, 782, and 7,845 genes were detected in intersex, male, and female transcriptomes, respectively. The female gonad expressed more genes than the male gonad, and more genes were involved in female gonadal development. Genes (sox9, foxl2) are differentially expressed in different sexes and may be important sex-related genes in Russian sturgeon. Sox9 genes are responsible for the development of male gonads and foxl2 for female gonads.

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Section: Discussionmentioning

confidence: 99%

Discovery and identification of candidate sex-related genes based on transcriptome sequencing of Russian sturgeon (Acipenser gueldenstaedtii) gonads

Chen

Xia²,

Shao

et al. 2016

Physiological Genomics

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“…Nevertheless, we did not find any link between chromosome number and development of the intersexual or sterile gonads in the hybrids studied here. Sex differentiation process in fish can be modified by genetic, environmental, behavioural and physiological factors (Chan and Yeung 1983;Devlin and Nagahama 2002). Interspecific crosses may change both sex determination and gonadal differentiation processes in the fish hybrid progenies.…”

Section: Discussionmentioning

confidence: 99%

Cytogenetic and histological studies of the brook trout, Salvelinus fontinalis (Mitchill), and the Arctic char, S. alpinus (L.) hybrids

et al. 2013

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Although brook trout and the Arctic char hybrids are able to reproduce, individuals with decreased fertility or even fish that are unable to produce any gametes have been also described. Abnormal gonadal development and disturbances in the gamete production in the char hybrid offspring may be triggered by the odd chromosome number and disturbances in their pairing during meiosis. To verify this hypothesis, cytogenetic examination and the gonadal histology analysis of the brook trout x Arctic char hybrids were carried out. Diploid chromosome number in the studied char (F 1 ) hybrids varied from 82 to 84 (FN = 99-102). Among 28 hybrids, 12 males, three females, nine intersex individuals and two sterile specimens were described. In the case of two individuals, gonads were not found. Diploid chromosome numbers in the males and intersex individuals varied from 82 to 84. Chromosome numbers in the females were 82 and 83 chromosomes. Two sterile fish exhibited karyotypes composed of 82 and 84 chromosomes. Predominance of the ovarian component in the intersex gonads and gonadal sex ratio distortion towards the males suggested hybrid females had problems with gonadal differentiation. However, the lack of the clear relationship between chromosome number and gonadal development in the studied hybrids did not support our hypothesis that odd chromosome number may be responsible for such reproductive disturbances in the hybrid individuals. We have presumed that sterility and intersexual development of the gonads may be caused by interactions between brook trout and Arctic char genes on the sex chromosomes and autosomes rather than unpairing of the parental chromosomes.

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“…Sex change in fishes can be induced by social conditions and relative size of neighboring conspecifics (Thresher 1984;Warner 1984). Sex change may also be initiated through application of exogenous testosterone (Chan & Yeung 1983;Kramer et al 1988). Rapid color changes observed in sex-changing fish involve integration of visual stimuli with sex-steroid and GnRH action (Demski 1987).…”

Section: Fishesmentioning

confidence: 99%

Evolutionary Perspectives on Sex Steroids in the Vertebrates

Noriega¹

2012

Sex Steroids

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4 Sex Control and Sex Reversal in Fish Under Natural Conditions

Cited by 86 publications

References 93 publications

Discovery and identification of candidate sex-related genes based on transcriptome sequencing of Russian sturgeon (Acipenser gueldenstaedtii) gonads

Discovery and identification of candidate sex-related genes based on transcriptome sequencing of Russian sturgeon (Acipenser gueldenstaedtii) gonads

Cytogenetic and histological studies of the brook trout, Salvelinus fontinalis (Mitchill), and the Arctic char, S. alpinus (L.) hybrids

Evolutionary Perspectives on Sex Steroids in the Vertebrates

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