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https://www.readbyqxmd.com/read/29904069/exposure-to-an-anti-androgenic-herbicide-negatively-impacts-reproductive-physiology-and-fertility-in-xenopus-tropicalis
#1
F Orton, M Säfholm, E Jansson, Y Carlsson, A Eriksson, J Fick, T Uren Webster, T McMillan, M Leishman, B Verbruggen, T Economou, C R Tyler, C Berg
Amphibians are threatened on a global scale and pollutants may be contributing to population declines, but how chemicals impact on their reproduction is poorly understood. We conducted a life cycle analysis to investigate the impacts of early life exposure to two anti-androgens (exposure until completion of metamorphosis;stage 66): flutamide, (50 µg/L)/linuron (9 and 45 µg/L)) on sexual development and breeding competence in Xenopus tropicalis. Our analyses included: mRNA levels of dmrt1, cyp17, amh, cyp19, foxl2 and ar (tadpoles/metamorphs), gonadal histomorphology (metamorphs/adults), mRNA levels of ar/gr (adult male brain/gonad/forelimb), testosterone/corticosterone levels (adult males), secondary sexual characteristics (forelimb width/nuptial pad: adult males) and breeding competence (amplexus/fertility: adult males)...
June 14, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29882921/distinct-dna-methylation-profiles-in-ovarian-tumors-opportunities-for-novel-biomarkers
#2
Lorena Losi, Sergio Fonda, Sara Saponaro, Sonia T Chelbi, Cesare Lancellotti, Gaia Gozzi, Loredana Alberti, Luca Fabbiani, Laura Botticelli, Jean Benhattar
Aberrant methylation of multiple promoter CpG islands could be related to the biology of ovarian tumors and its determination could help to improve treatment strategies. DNA methylation profiling was performed using the Methylation Ligation-dependent Macroarray (MLM), an array-based analysis. Promoter regions of 41 genes were analyzed in 102 ovarian tumors and 17 normal ovarian samples. An average of 29% of hypermethylated promoter genes was observed in normal ovarian tissues. This percentage increased slightly in serous, endometrioid, and mucinous carcinomas (32%, 34%, and 45%, respectively), but decreased in germ cell tumors (20%)...
May 24, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29800110/conditional-deletion-of-foxl2-and-smad4-in-gonadotropes-of-adult-mice-causes-isolated-fsh-deficiency
#3
Yining Li, Gauthier Schang, Ying Wang, Xiang Zhou, Adrien Levasseur, Alexandre Boyer, Chu-Xia Deng, Mathias Treier, Ulrich Boehm, Derek Boerboom, Daniel J Bernard
The glycoprotein follicle-stimulating hormone (FSH), a product of pituitary gonadotrope cells, regulates ovarian follicle development in females and spermatogenesis in males. FSH is a heterodimer of the common α gonadotropin subunit and the hormone-specific FSHβ subunit (a product of the Fshb gene). Using a conditional knockout approach (Cre-lox), we previously demonstrated that Fshb expression in mice depends on the transcription factors FOXL2 and SMAD4. Deletion of Foxl2 or Smad4 alone led to FSH deficiency, female subfertility, and oligozoospermia in males...
May 23, 2018: Endocrinology
https://www.readbyqxmd.com/read/29792308/logical-modelling-uncovers-developmental-constraints-for-primary-sex-determination-of-chicken-gonads
#4
Lucas Sánchez, Claudine Chaouiya
In the chicken, sex determination relies on a ZZ (male)/ZW (female) chromosomal system, but underlying mechanisms are still not fully understood. The Z-dosage and the dominant W-chromosome hypotheses have been proposed to underlie primary sex determination. We present a modelling approach, which assembles the current knowledge and permits exploration of the regulation of this process in chickens. Relying on published experimental data, we assembled a gene network, which led to a logical model that integrates both the Z-dosage and dominant W hypotheses...
May 2018: Journal of the Royal Society, Interface
https://www.readbyqxmd.com/read/29788434/a-novel-mouse-model-of-testicular-granulosa-cell-tumors
#5
Xin Fang, Nan Ni, Yang Gao, David F Vincent, Laurent Bartholin, Qinglei Li
STUDY QUESTION: What is the role of dysregulated transforming growth factor beta (TGFB) signaling in the development of sex cord-stromal tumors in the testis? SUMMARY ANSWER: Overactivation of TGFB signaling results in the development of testicular tumors resembling granulosa cell tumors (GrCTs). WHAT IS KNOWN ALREADY: In an earlier study, we demonstrated that constitutively active TGFB receptor 1 (TGFBR1) in ovarian somatic cells promotes the development of ovarian GrCTs...
May 21, 2018: Molecular Human Reproduction
https://www.readbyqxmd.com/read/29785396/expression-characterization-of-six-genes-possibly-involved-in-gonad-development-for-stellate-sturgeon-individuals-acipenser-stellatus-pallas-1771
#6
Alexandru Burcea, Gina-Oana Popa, Iulia Elena Florescu Gune, Marilena Maereanu, Andreea Dudu, Sergiu Emil Georgescu, Marieta Costache
Nowadays, in sturgeon's aquaculture, there is a necessity for sex identification at early stages in order to increase the efficiency of this commercial activity. The basis for a correct identification is studying the different factors that influence the gonad development. The research has been directed towards molecular methods that have been employed with various degrees of success in identifying genes with different expression patterns between male and female sturgeons during their development stages. For the purpose of understanding the sexual development of 4-year-old stellate sturgeon (Acipenser stellatus) individuals, we have selected six genes ( foxl2 , cyp17a1 , ar , dmrt1 , sox9 , and star )...
2018: International Journal of Genomics
https://www.readbyqxmd.com/read/29782841/alternative-splicing-of-gnrh2-and-gnrh2-associated-peptide-plays-roles-in-gonadal-differentiation-of-the-rice-field-eel-monopterus-albus
#7
Ke Feng, Hongrui Luo, Mingxi Hou, Yongming Li, Ji Chen, Zuoyan Zhu, Wei Hu
The rice field eel, Monopterus albus, is a protogynous hermaphrodite fish, in which the gonads are initially female ovaries which then transform into male testes. The exact mechanisms governing sex reversal in the rice field eel are unknown. In this study, a novel alternative splicing variant of GnRH2 (GnRH2-SV), retaining the second intron, was discovered in the gonad of the rice field eel. Compared to GnRH2, GnRH2-SV may give rise to a novel truncated GnRH2-associated peptide (New GAP2). The normal transcript of GnRH2 was primarily expressed in the brain, and could also be detected in the liver, spleen, ovary, and testis...
May 18, 2018: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/29781764/charged-iron-particles-found-in-galactic-cosmic-rays-are-potent-inducers-of-epithelial-ovarian-tumors
#8
Birendra Mishra, Gregory W Lawson, Ryan Ripperdan, Laura Ortiz, Ulrike Luderer
Astronauts traveling in deep space are exposed to high-charge and energy (HZE) particles from galactic cosmic rays. We have previously determined that irradiation of adult female mice with iron HZE particles induces DNA double-strand breaks, oxidative damage and apoptosis in ovarian follicles, causing premature ovarian failure. These effects occur at lower doses than with conventional photon irradiation. Ovarian failure with resultant loss of negative feedback and elevated levels of gonadotropin hormones is thought to play a role in the pathophysiology of ovarian cancer...
May 21, 2018: Radiation Research
https://www.readbyqxmd.com/read/29777416/identification-of-genes-involved-in-gonadal-sex-differentiation-and-the-dimorphic-expression-pattern-in-takifugu-rubripes-gonad-at-the-early-stage-of-sex-differentiation
#9
Hongwei Yan, Xufang Shen, Xin Cui, Yumeng Wu, Lianshun Wang, Lei Zhang, Qi Liu, Yusheng Jiang
Quantifying the expression of mRNAs in the gonads at the critical stage of molecular sex differentiation stage might help to clarify the regulatory network during early sex differentiation and provide new information on the role of sex-related genes in gonadal function. In this study, transcriptomic analysis of sex-related genes expression profiles in fugu gonads at 60 and 90 days after hatching (dah) was conducted firstly, and a total of 112,504,991 clean reads, encompassing 28.35 Gb of sequences were retrieved...
May 18, 2018: Fish Physiology and Biochemistry
https://www.readbyqxmd.com/read/29764377/transcriptome-display-during-tilapia-sex-determination-and-differentiation-as-revealed-by-rna-seq-analysis
#10
Wenjing Tao, Jinlin Chen, Dejie Tan, Jing Yang, Lina Sun, Jing Wei, Matthew A Conte, Thomas D Kocher, Deshou Wang
BACKGROUND: The factors determining sex in teleosts are diverse. Great efforts have been made to characterize the underlying genetic network in various species. However, only seven master sex-determining genes have been identified in teleosts. While the function of a few genes involved in sex determination and differentiation has been studied, we are far from fully understanding how genes interact to coordinate in this process. RESULTS: To enable systematic insights into fish sexual differentiation, we generated a dynamic co-expression network from tilapia gonadal transcriptomes at 5, 20, 30, 40, 90, and 180 dah (days after hatching), plus 45 and 90 dat (days after treatment) and linked gene expression profiles to both development and sexual differentiation...
May 15, 2018: BMC Genomics
https://www.readbyqxmd.com/read/29758382/effects-of-exposure-to-bpf-on-development-and-sexual-differentiation-during-early-life-stages-of-zebrafish-danio-rerio
#11
Qian Yang, Xianhai Yang, Jining Liu, Yingwen Chen, Shubao Shen
Bisphenol F (BPF) has become a predominant bisphenol contaminant in recent years. It has significant estrogenic properties in both in vivo and in vitro studies. We have previously studied the disrupting mechanisms of BPF on the hypothalamic-pituitary-gonadal axis of adult zebrafish. However, the effects of BPF exposure on development and sexual differentiation of zebrafish embryos/larvae remain unclear. To determine the effects of BPF on the critical stage of sex differentiation in zebrafish, zebrafish embryos/larvae were exposed to 1, 10, 100, and 1000 μg/L BPF from fertilization to 60 days post-fertilization (dpf)...
May 11, 2018: Comparative Biochemistry and Physiology. Toxicology & Pharmacology: CBP
https://www.readbyqxmd.com/read/29735715/znrf3-functions-in-mammalian-sex-determination-by-inhibiting-canonical-wnt-signaling
#12
Abigail Harris, Pam Siggers, Silvia Corrochano, Nick Warr, Danielle Sagar, Daniel T Grimes, Makoto Suzuki, Rebecca D Burdine, Feng Cong, Bon-Kyoung Koo, Hans Clevers, Isabelle Stévant, Serge Nef, Sara Wells, Raja Brauner, Bochra Ben Rhouma, Neïla Belguith, Caroline Eozenou, Joelle Bignon-Topalovic, Anu Bashamboo, Ken McElreavey, Andy Greenfield
Mammalian sex determination is controlled by the antagonistic interactions of two genetic pathways: The SRY-SOX9-FGF9 network promotes testis determination partly by opposing proovarian pathways, while RSPO1/WNT-β-catenin/FOXL2 signals control ovary development by inhibiting SRY-SOX9-FGF9. The molecular basis of this mutual antagonism is unclear. Here we show that ZNRF3, a WNT signaling antagonist and direct target of RSPO1-mediated inhibition, is required for sex determination in mice. XY mice lacking ZNRF3 exhibit complete or partial gonadal sex reversal, or related defects...
May 7, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29684078/ovarian-mast-cells-migrate-toward-ovary-fimbria-connection-in-neonatal-mrl-mpj-mice
#13
Teppei Nakamura, Masataka Chihara, Osamu Ichii, Saori Otsuka-Kanazawa, Ken-Ichi Nagasaki, Yaser Hosny Ali Elewa, Osamu Tatsumi, Yasuhiro Kon
MRL/MpJ mice have abundant ovarian mast cells (MCs) as compared with other strains at postnatal day 0 (P0); however, they sharply decrease after birth. These ovarian MCs, particularly beneath the ovarian surface epithelium (SE), which express mucosal MC (MMC) marker, might participate in early follicular development. This study investigated the changes in spatiotemporal distribution of MCs in the perinatal MRL/MpJ mouse ovaries. At P0 to P7, the MCs were densely localized to the ovary, especially their caudomedial region around the ovary-fimbria connection...
2018: PloS One
https://www.readbyqxmd.com/read/29666332/expression-profiles-of-amh-and-foxl2-in-schizothorax-kozlovi-and-their-response-to-temperature-during-the-early-developmental-stage
#14
Yongfeng He, Xuge Wang, Xingbing Wu, Yongjiu Zhu, Deguo Yang
To elucidate the role of amh and foxl2 in sex differentiation of the teleost fish Schizothorax kozlovi, the full-length cDNAs were cloned from the mature testis and ovary by rapid amplification of cDNA ends (RACE), and their relative mRNA expression levels were determined by quantitative real-time polymerase chain reaction among tissues and temperature groups. The complete amh and foxl2 cDNAs of S. kozlovi were 2060 bp and 1750 bp, which encoded 568 and 306 amino acids, respectively. The amh were expressed only in gonads, while foxl2 was expressed in the gills, brain and gonads, both exhibiting relatively high tissue specificity...
March 2018: Journal of Genetics
https://www.readbyqxmd.com/read/29660837/dicer1-hot-spot-mutations-in-ovarian-gynandroblastoma
#15
Yemin Wang, Anthony N Karnezis, Jamie Magrill, Basile Tessier-Cloutier, Amy Lum, Janine Senz, C Blake Gilks, W Glenn McCluggage, David G Huntsman, Friedrich Kommoss
AIMS: Gynandroblastoma is a rare ovarian sex cord-stromal tumour characterised by the presence of both male (Sertoli and/or Leydig cells) and female (granulosa cells) components. We investigated the mutational status of DICER1, FOXL2 and AKT1 genes at hot-spot regions that are known to be the key driving events in the development of Sertoli-Leydig cell tumour (SLCT), adult granulosa cell tumour (aGCT) and juvenile granulosa cell tumour (jGCT), respectively, to gain insights into the molecular pathogenesis of gynandroblastoma...
April 16, 2018: Histopathology
https://www.readbyqxmd.com/read/29616724/sex-determination-and-gonadal-sex-differentiation-in-the-chicken-model
#16
Claire E Hirst, Andrew T Major, Craig A Smith
Our understanding of avian sex determination and gonadal development is derived primarily from the studies in the chicken. Analysis of gynandromorphic chickens and experimental chimeras indicate that sexual phenotype is at least partly cell autonomous in the chicken, with sexually dimorphic gene expression occurring in different tissue and different stages. Gonadal sex differentiation is just one of the many manifestations of sexual phenotype. As in other birds, the chicken has a ZZ male: ZW female sex chromosome system, in which the male is the homogametic sex...
2018: International Journal of Developmental Biology
https://www.readbyqxmd.com/read/29602213/expression-of-the-sox9-foxl2-vasa-and-trpv4-genes-in-the-ovaries-and-testes-of-the-morelet-s-crocodile-crocodylus-moreletii
#17
Adriana Martínez-Juárez, Marco A López-Luna, Tania J Porras-Gómez, Norma Moreno-Mendoza
The Sox9 gene is important for determining sex in vertebrates, as well as for maintaining testis morphology and fertility during adult life. In the same way, Vasa is an important gene for the maintenance of the germinal lineage and has been highly conserved throughout evolution, as it is expressed in germ cells of both vertebrates and invertebrates. In the particular case of crocodiles, the expression of Sox9 during gonadal morphogenesis and in the testes of 3-month-old Alligator mississippiensis has been studied...
May 2018: Journal of Experimental Zoology. Part B, Molecular and Developmental Evolution
https://www.readbyqxmd.com/read/29549247/endogenous-c-jun-n-terminal-kinase-jnk-activity-marks-the-boundary-between-normal-and-malignant-granulosa-cells
#18
Gamze Bildik, Nazli Akin, Filiz Senbabaoglu, Yashar Esmalian, Gizem Nur Sahin, Defne Urman, Sercin Karahuseyinoglu, Umit Ince, Erhan Palaoglu, Cagatay Taskiran, Macit Arvas, Yilmaz Guzel, Kayhan Yakin, Ozgur Oktem
Granulosa cell tumor of the ovary (GCT) is a very rare tumor, accounting for only 2% of all ovarian tumors. It originates from sex cords in the ovary and can be divided into adult (95%) and juvenile (5%) types based on histologic findings. To date, no clear etiologic process has been identified other than a missense point mutation in the FOXL2 gene. Our previous works showed that c-Jun N-terminal kinase (JNK) pathway plays critical role in cell cycle progression and mitosis of normal and immortalized granulosa cells and follicle growth in rodent ovaries...
March 16, 2018: Cell Death & Disease
https://www.readbyqxmd.com/read/29546597/proteome-and-transcriptome-analysis-of-ovary-intersex-gonads-and-testis-reveals-potential-key-sex-reversal-differentiation-genes-and-mechanism-in-scallop-chlamys-nobilis
#19
Yu Shi, Wenguang Liu, Maoxian He
Bivalve mollusks exhibit hermaphroditism and sex reversal/differentiation. Studies generally focus on transcriptional profiling and specific genes related to sex determination and differentiation. Few studies on sex reversal/differentiation have been reported. A combination analysis of gonad proteomics and transcriptomics was conducted on Chlamys nobilis to provide a systematic understanding of sex reversal/differentiation in bivalves. We obtained 4258 unique peptides and 93,731 unigenes with good correlation between messenger RNA and protein levels...
April 2018: Marine Biotechnology
https://www.readbyqxmd.com/read/29524574/identification-and-differential-expression-of-micrornas-in-testis-and-ovary-of-amur-sturgeon-acipenser-schrenckii
#20
Xiujuan Zhang, Linmiao Li, Haiying Jiang, Jing E Ma, Juan Li, Jinping Chen
BACKGROUND: MicroRNAs (miRNAs) cooperate with sex-related genes in post-transcriptional regulation and play extremely important roles in the establishment of sexually dimorphic traits in animals. However, the gonad miRNAs and expression patterns of miRNAs in sturgeon have not been investigated. METHODS: In the present study, we used high-throughput small RNA sequencing (RNA-Seq) to discover gonad miRNAs from the ovaries and testes of Amur sturgeons (Acipenser schrenckii)...
June 5, 2018: Gene
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