Sexual Size Dimorphism, Sex Determination, and Sex Control in Yellow Catfish

Mei, Jie; Gui, Jian‐Fang

doi:10.1002/9781119127291.ch24

Cited by 13 publications

(6 citation statements)

References 57 publications

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“…Differentiation of ovary and testis in PF is initiated at about 12 and 20 days post hatching (dph) respectively (Mei & Gui, 2018). Germ cell development was further examined in PF and PF × PV hybrid at early developmental stages by histological analysis.…”

Section: Resultsmentioning

confidence: 99%

Defective germplasm assembly and germ cell development contribute to hybrid sterility in yellow catfish

Chu

Xiong

et al. 2021

Aquaculture Research

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Hybrid sterility has been widely observed in fish species; however, the molecular mechanisms of hybrid sterility are not well understood. In this work, we compared the reproductive development of yellow catfish (Pelteobagrus fulvidraco, PF) and hybrid yellow catfish (Pelteobagrus fulvidraco ♀ × Pelteobagrus vachelli ♂) from embryo to adult at cellular and molecular levels. Firstly, we developed a pair of genetic markers to efficiently distinguish PF and PV (Pelteobagrus vachelli) and their interspecific hybrid. Hybrid sterility was observed in hybrid yellow catfish, as indicated by the germ cell‐less phenotype and defective gonadal development. The expression levels of germ cell differentiation‐related and gonadal somatic cell development‐related genes were obviously down‐regulated in PF × PV hybrid than in PF. In addition, meiotic and mitotic defects were detected in the testis of PF × PV hybrid, since the numbers of Sycp3‐ and PH3‐positive cells were obviously reduced. As early as 4‐cell stage, defects of germplasm assembly and accelerated decay of maternal germline‐specific mRNAs were observed in hybrid yellow catfish. Our studies provide evidence that hybrid sterility in animals might be caused by the accelerated decay of germplasm mRNAs, impaired germplasm assembly and defective germ cell development.

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Section: Resultsmentioning

confidence: 99%

Defective germplasm assembly and germ cell development contribute to hybrid sterility in yellow catfish

Chu

Xiong

et al. 2021

Aquaculture Research

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“…Recently, YY-genotype male yellow catfish, channel catfish and southern catfish have been generated via the integration of hormonally induced sex-reversal technology and sex-linked marker identification [ 8 , 9 , 36 , 37 ], providing a unique research model for studying the structure and evolution of sex chromosomes in catfishes. Sexually reversed XX-neomale yellow catfish were artificially produced by using an aromatase inhibitor, letrozole, and artificially induced sex reversal leads to a transition from GSD to TSD in yellow catfish [ 30 ].…”

Section: Introductionmentioning

confidence: 99%

Origin and chromatin remodeling of young X/Y sex chromosomes in catfish with sexual plasticity

Gong

Xiong

Xiao³

et al. 2022

National Science Review

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Assembly of complete Y chromosome is a significant challenge in animals with XX/XY sex determination system. Recently, we created YY supermale yellow catfish by crossing XY males with sex-reversed XY females, providing a valuable model for Y chromosome assembly and evolution. Here, we assembled highly homomorphic Y and X chromosomes by sequencing genomes of the YY supermale and XX female in yellow catfish, revealing their nucleotide divergences with only less than 1% and with the same gene compositions. The sex-determining region (SDR) was identified to locate within a physical distance of 0.3 Mb by FST scanning. Strikingly, the incipient sex chromosomes were revealed to originate via autosome-autosome fusion and were characterized by a highly rearranged region with an SDR downstream of the fusion site. We found that the Y chromosome was at a very early stage of differentiation, as no clear evidence of evolutionary strata and classical structure features of recombination suppression for a rather late stage of Y chromosome evolution were observed. Significantly, a number of sex-antagonistic mutations and the accumulation of repetitive elements were discovered in the SDR, which might be the main driver of the initial establishment of recombination suppression between young X and Y chromosomes. Moreover, distinct three-dimensional chromatin organizations of the Y and X chromosomes were identified in the YY supermales and XX females, as the X chromosome exhibited denser chromatin structure than the Y chromosome, while they respectively have significantly spatial interactions with female- and male-related genes compared with other autosomes. The chromatin configuration of the sex chromosomes as well as the nucleus spatial organization of the XX-neomale were remodelled after sex reversal and similar to those in YY supermales, and a male-specific loop containing the SDR was found in the open chromatin region. Our results elucidate the origin of young sex chromosomes and the chromatin remodelling configuration in the catfish sexual plasticity.

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“…They show a very diverse range of phenotypes and possess heterogeneous and highly flexible sex determination (SD) mechanisms, including systems based on genetic and environmental SD, as well as sex chromosomal or polygenic SD systems (Paul-Prasanth et al, 2011; Penman and Piferrer, 2008). Nearly 400 species of the finfishes are considered to be commercially significant according to the UN Food and Agriculture Organization (FAO, 2018) and many of them display substantial sexual dimorphism in commercially important traits, such as growth rate (Beardmore et al, 2001; Kocour et al, 2003; Mei and Gui, 2018; Zhou et al, 2021), fillet quality (Manor et al, 2015), yield (Bosworth et al, 2001) or mortality rate (Su et al, 2013). Therefore, the use of monosex production for these species can be desirable.…”

Section: Introductionmentioning

confidence: 99%

Validation of a male-specific DNA marker confirms XX/XY-type sex determination in African catfish (Clarias gariepinus)

Balogh

Csorbai

Guti

et al. 2022

Preprint

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African catfish (Clarias gariepinus) is a promising food fish species with significant potential and growing mass of production in freshwater aquaculture. Male African catfish possess improved production characteristics over females, therefore the use of monosex populations could be advantageous for aquaculture production. However, our knowledge about the sex determination mechanism of this species is still limited and controversial. A previously isolated male-specific DNA marker (CgaY1) was validated using offspring groups from targeted crosses (n=630) and it was found to predict the sex of 608 individuals correctly (96.43% accuracy). Using the proportion of recombinants, we estimated the average genetic distance between the potential sex determination locus and the sex-specific marker to be 2.69 cM. As an earlier study suggested that both XX/XY and ZZ/ZW systems coexist in this species, we tested the applicability of their putative moderately sex-linked loci and found that no sex-specific amplification could be detected for any of them. In addition, temperature-induced masculinization suggested by others was also tested, but no such effect was detected in our stocks when the published parameters were used for heat treatment. Altogether, our results support an exclusive XX/XY sex determination system in our African catfish stock and indicate a good potential for the future use of this male-specific DNA marker in research and commercial production.

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Sexual Size Dimorphism, Sex Determination, and Sex Control in Yellow Catfish

Cited by 13 publications

References 57 publications

Defective germplasm assembly and germ cell development contribute to hybrid sterility in yellow catfish

Defective germplasm assembly and germ cell development contribute to hybrid sterility in yellow catfish

Origin and chromatin remodeling of young X/Y sex chromosomes in catfish with sexual plasticity

Validation of a male-specific DNA marker confirms XX/XY-type sex determination in African catfish (Clarias gariepinus)

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