Hormonal control of sex and color change in the stoplight parrotfish, Sparisoma viride

Cardwell, J. R.; Liley, N. R.

doi:10.1016/0016-6480(91)90120-u

Cited by 135 publications

(90 citation statements)

References 35 publications

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“…Plasma levels of E2 were much higher (P < 0.05) in sex-reversing females than in non-reversed male black porgy during the experimental period which was consistent with the previous data (Chang etal, 1994 (Chang ef al, 1994 (Cardwell and Liley, 1991) and wrasse T dupperrey (Nakamura et al, 1989). The discrepancy of the LH-RH action in the sex reversal is possibly due to the different mechanism of sex reversal in protandrous and protogynous fish and also species differences.…”

Section: Introductionsupporting

confidence: 91%

A microencapsulated analog of LH-RH accelerates maturation but without stimulating sex reversal in the protandrous black porgy, Acanthopagrus schlegeli

Chang¹,

Yueh²,

Lee³

et al. 1995

Reprod. Nutr. Dev.

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Summary ― The objective of this study was to regulate the reproduction and levels of gonadal steroids in 3-year-old protandrous black porgy (Acanthopagrus schlegeli) by treatment with microencapsulated o-Trp s -luteinizing hormone-releasing hormone (LH-RH analog) during the prespawning season. Twenty-four previously male black porgy were equally divided into 2 groups and injected with vehicle (control group) or with microencapsulated LH-RH analog (LH-RH analog group), respectively. Spermiation and plasma levels of testosterone (T), estradiol-1 7p (E2) and 17a-hydroxyprogesterone (17a-OH P) were measured, after treatment, at intervals of 1-2 weeks for 4 months. Oocyte diameters were also measured after 4, 10, 12, 14 and 16 weeks of treatment. The microencapsulated LH-RH analog accelerated the onset of spermiation by at least 5 weeks. Oocyte diameters were also significantly increased in the LH-RH analog group. The microencapsulated LH-RH analog did not increase the number of sex-reversing females compared with the number in the control group. High levels of plasma E2 were found in the sex-reversing females in the LH-RH analog and control groups during the prespawning and spawning season. Low levels of plasma E2 were observed in the non-reversed males in both the LH-RH analog and the control groups. Similar profiles of plasma T levels were detected in male and in reversing female black porgy in the LH-RH analog and control groups. Plasma 17a-OH P levels were low and constant throughout the experimental period in fish in each group. These findings indicate that the microencapsulated LH-RH analog accelerated gonadal maturation in the black porgy during the prespawning season. Plasma levels of E2 seem to be closely related to the occurrence of natural sex reversal in the protandrous black porgy, A schlegeli.

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Section: Introductionsupporting

confidence: 91%

A microencapsulated analog of LH-RH accelerates maturation but without stimulating sex reversal in the protandrous black porgy, Acanthopagrus schlegeli

Chang¹,

Yueh²,

Lee³

et al. 1995

Reprod. Nutr. Dev.

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“…The roles of 11-KT were investigated in protogynous hermaphrodite fish species that showed similar gonadal morphology during the natural sex reversal process to that observed in juvenile zebrafish (Wang et al, 2007). Increased 11-KT concentrations were observed during the natural ovarytestis transition in several species, such as Thalassoma dupperrey (Nakamura et al, 1989), Sparisoma viride (Cardwell and Liley, 1991), and Epinephelus merra (Bhandari et al, 2003;Alam et al, 2006). Artificial female-tomale sex reversal could also be induced by treating individuals of two of these species with 11-KT (Cardwell and Liley, 1991;Bhandari et al, 2006).…”

Section: The Most Predominant Male Steroid Hormone 11-kt Is Not the Fmentioning

confidence: 99%

“…Increased 11-KT concentrations were observed during the natural ovarytestis transition in several species, such as Thalassoma dupperrey (Nakamura et al, 1989), Sparisoma viride (Cardwell and Liley, 1991), and Epinephelus merra (Bhandari et al, 2003;Alam et al, 2006). Artificial female-tomale sex reversal could also be induced by treating individuals of two of these species with 11-KT (Cardwell and Liley, 1991;Bhandari et al, 2006). Thus, Alam et al (2006) proposed that 11-KT may provide the stimulus for female to degenerate oocytes and initiate sex change in these species.…”

Section: The Most Predominant Male Steroid Hormone 11-kt Is Not the Fmentioning

confidence: 99%

Anti‐Müllerian hormone and 11 β‐hydroxylase show reciprocal expression to that of aromatase in the transforming gonad of zebrafish males

Wang

Orbán

2007

Developmental Dynamics

158

118

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During development all zebrafish males first develop a "juvenile ovary" that later degenerates and transforms into a testis. In this study, individuals undergoing gonadal transformation were identified from a vas::egfp transgenic line and used for gene expression analysis of anti-Mü llerian hormone (amh), ovarian aromatase (cyp19a1a) and 11␤-hydroxylase (cyp11b, also known as P450 11␤ ) by real-time polymerase chain reaction and in situ hybridization. In the "normal (i.e., nontransforming) juvenile ovary" cyp19a1a was expressed around the oocytes, but cyp11b and amh could not be detected. During gonadal transformation cyp19a1a was down-regulated and could not be detected anymore; in contrast amh was up-regulated and highly expressed at similar regions where cyp19a1a had been expressed earlier. Furthermore, the normalized transcript levels of cyp19a1a and amh showed a reciprocal picture, i.e., the higher was the level of amh, the lower was that of cyp19a1a. Expression of cyp11b was also up-regulated but later than amh, and its localization was not related to the position of degenerating oocytes. These data indicate that amh is a candidate gene down-regulating cyp19a1a, leading to "juvenile ovary-to-testis" transformation. Whereas, cyp11b or its product, 11-ketotestosterone, is unlikely to be the inducer of zebrafish gonad transformation, as proposed earlier for some protogynous hermaphroditic fish species. Developmental Dynamics 236: 1329 -1338, 2007.

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“…Androgens have been shown to play roles in sex differentiation (Baroiller et al 1998) and sex change (Cardwell and Liley 1991) in protogynous hermaphrodites. In males, 11-KT, teleost-specific androgen, is considered a principal androgen in teleostean fish, and it plays a central role in sexual maturation, development of secondary sexual characteristics and reproductive behaviour (Miura et al 1991;Borg 1994).…”

Section: Endocrine Changes and Regulation During Sex Change Of Groupersmentioning

confidence: 99%

Molecular mechanisms underlying sex change in hermaphroditic groupers

Zhou

Gui

2008

Fish Physiol Biochem

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Groupers are widely distributed throughout the tropical and subtropical waters of the world and are regarded as a favourite marine food fish. However, their large-scale aquaculture has been hindered by the rarity of natural males. Being protogynous hermaphrodites, groupers have been considered as study model for development and reproduction, especially for sex determination or sex differentiation, owing to the advantage that grouper gonad development undergoes transition from ovary to intersexual gonad and then to testis, and primordial germ cells and different stages of gametic cells during oogenesis and spermatogenesis are synchronously observed in the transitional gonads. Recently, a series of genes related to the reproduction regulation or sex differentiation have been identified in the groupers, mainly by researchers in China. One important finding was that the grouper gene, doublesex/male abnormal 3-related transcription factor 1 (DMRT1), is not only differentially expressed in gonads at different stages, but that it is also restricted to specific stages and specific cells of spermatogenesis. Grouper DMRT1 protein exists only in spermatogonia, primary spermatocytes and secondary spermatocytes, but not in the supporting Sertoli cells. Moreover, no introns were found in the grouper DMRT1, and no duplicated DMRT1 genes were detected. The finding implies that the intronless DMRT1 that is able to undergo rapid transcriptional turnover might be a significant gene for stimulating spermatogenesis in the protogynous hermaphroditic gonad. Additionally, we have found that grouper expression of sex-determining region Y-related highmobility group-box gene 3 (SOX3) is a significant time point for enterable gametogenesis of primordial germ cells, because SOX3 is obviously expressed and localized in primordial germ cells. As SOX3 continues to express, the SOX3-positive primordial germ cells develop toward oogonia and then oocytes, whereas, when SOX3 expression is ceased, the SOX3-positive primordial germ cells develop toward spermatogonia. Therefore, we suggest that SOX3, as a transcription factor, might have more important roles in oogenesis than in spermatogenesis. Based on the findings, a hypothetic molecular mechanism underlying sex change is proposed in the hermaphroditic groupers, and some candidate genes related to the grouper sex change are also suggested for further research.

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Hormonal control of sex and color change in the stoplight parrotfish, Sparisoma viride

Cited by 135 publications

References 35 publications

A microencapsulated analog of LH-RH accelerates maturation but without stimulating sex reversal in the protandrous black porgy, Acanthopagrus schlegeli

A microencapsulated analog of LH-RH accelerates maturation but without stimulating sex reversal in the protandrous black porgy, Acanthopagrus schlegeli

Anti‐Müllerian hormone and 11 β‐hydroxylase show reciprocal expression to that of aromatase in the transforming gonad of zebrafish males

Molecular mechanisms underlying sex change in hermaphroditic groupers

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