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Fish puberty

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https://www.readbyqxmd.com/read/27887945/kisspeptin-system-in-pejerrey-fish-odontesthes-bonariensis-characterization-and-gene-expression-pattern-during-early-developmental-stages
#1
M Oswaldo Tovar Bohórquez, Alejandro S Mechaly, Lily C Hughes, Daniela Campanella, Guillermo Ortí, Luis F Canosa, Gustavo M Somoza
In vertebrates, kisspeptins and their receptors are known to be related to puberty onset and gonadal maturation, however, there are few studies concerning their role in early development. Here, we characterize the kisspeptin system in the pejerrey, Odontesthes bonariensis, a fish with strong temperature-dependent sex determination. We reconstructed the phylogenetic history of the two ligands (kiss1 and kiss 2) and two receptors (kissr2 and kissr3) in pejerrey in the context of recent classifications of bony fishes, determined their tissue distribution and documented the early expression pattern of these ligands and receptors...
November 23, 2016: Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
https://www.readbyqxmd.com/read/27806792/-analysis-of-clinical-features-and-related-genes-variation-in-five-patients-with-46-xx-male-syndrome
#2
X Y Qin, W K Dong, W Wang, Z Y Dong, Y Xiao, W L Lu, D F Wang
Objective: To explore the clinical manifestations and molecular features of 46, XX male syndrome. Method: The clinical and molecular data of five 46, XX male syndrome cases treated in the Department of Pediatrics of Shanghai Ruijin Hospital form August 2010 to August 2014 were retrospectively analyzed. Result: The five patients were all sociopsychologically males and came to hospital respectively for short stature, ambiguous genitalia or gynecomastia. They were all below the normal male's average height, and their karyotype was all 46, XX...
November 2, 2016: Zhonghua Er Ke za Zhi. Chinese Journal of Pediatrics
https://www.readbyqxmd.com/read/27765796/early-life-residence-fish-consumption-and-risk-of-breast-cancer
#3
Alfheidur Haraldsdottir, Laufey Steingrimsdottir, Unnur Valdimarsdottir, Thor Aspelund, Laufey Tryggvadottir, Tamara B Harris, Lenore Launer, Lorelei A Mucci, Edward L Giovannucci, Hans-Olov Adami, Vilmundur Gudnason, Johanna E Torfadottir
BACKGROUND: Little is known about fish intake throughout the life course and the risk of breast cancer. METHODS: We used data on the first residence of 9,340 women born 1908-1935 in the Reykjavik Study as well as food frequency data for different periods of life from a subgroup of the cohort entering the AGES-Reykjavik Study (n = 2,882). RESULTS: During a mean follow-up of 27.3 years, 744 women were diagnosed with breast cancer in the Reykjavik Study...
October 10, 2016: Cancer Epidemiology, Biomarkers & Prevention
https://www.readbyqxmd.com/read/27688073/identification-of-genes-in-the-hypothalamus-pituitary-gonad-axis-in-the-brain-of-amur-sturgeons-acipenser-schrenckii-by-comparative-transcriptome-analysis-in-relation-to-kisspeptin-treatment
#4
Shubo Jin, Dajiang Sun, Qingkai Xi, Xiaoli Dong, Dan Song, Hongtuo Fu, Ying Zhang
Kisspeptin plays an important role in the reproduction and onset of puberty in vertebrates through stimulation of gonadotropin-releasing hormone (GnRH). However, the mechanisms whereby kisspeptin-related genes regulate sexual differentiation in teleosts are poorly understood. We aimed to study the relationship between the hypothalamus-pituitary-gonad (HPG) axis and sexual differentiation in relation to kisspeptin in the sturgeon Acipenser schrenckii. We performed comparative transcriptomic analysis of the brains of sturgeons treated with KISS1-10 during the gonadal sex-differentiation-sensitive period (170-210days post-hatching (dph)) using an Illumina sequencing platform...
December 20, 2016: Gene
https://www.readbyqxmd.com/read/27650588/induction-of-gonadal-maturation-at-different-temperatures-in-burbot-lota-lota
#5
F J Schaefer, B Hermelink, P Husmann, W Meeus, J Adriaen, S Wuertz
A rearing experiment was conducted to test whether temperature protocols that differed from a simulation of natural conditions might induce maturation after isothermal grow-out in burbot Lota lota. Lota lota were acclimated to two different temperature regimes: low temperature (LT), close to natural temperature at 4·0° C and elevated, high temperature (HT) at 8·5° C over 40 and 27 days respectively, with all fish then wintered for 47 days. Every second fish was treated with a gonadotropin-releasing hormone analogue...
September 20, 2016: Journal of Fish Biology
https://www.readbyqxmd.com/read/27642097/possible-role-of-the-leptin-system-in-controlling-puberty-in-the-male-chub-mackerel-scomber-japonicus
#6
Hirofumi Ohga, Daisuke Hirata, Kojiro Matsumori, Hajime Kitano, Naoki Nagano, Akihiko Yamaguchi, Michiya Matsuyama
Leptin directly regulates kisspeptin neurons in the hypothalamus and gonadotropin secretion from the pituitary, making it a central player in the onset of mammalian puberty. Recently, we identified two leptin genes (lepa and lepb) and a single leptin receptor (lepr) in the marine perciform fish chub mackerel; however, the expression of these genes did not correlate with the expression of important reproductive genes or ovarian stage during female puberty. Here, we expand upon these initial observations by evaluating the expression of lepa, lepb, and lepr during pubertal transition and under differential feeding conditions in the male chub mackerel...
September 15, 2016: Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
https://www.readbyqxmd.com/read/27641683/photoperiod-modulates-the-reproductive-axis-of-european-sea-bass-through-regulation-of-kiss1-and-gnrh2-neuronal-expression
#7
F Espigares, A Rocha, A Gómez, M Carrillo, S Zanuy
The onset of puberty is characterized by activation of the brain-pituitary-gonad axis. However, the molecular and endocrine mechanism involved in the process of puberty and the influence of environmental conditions, such as photoperiod signalling, are not well understood in fish. In this study, 1-year-old male European sea bass (Dicentrarchus labrax) were exposed to photoperiod manipulation in combination with size-sorting. Two treatment groups, a puberty accelerating photoperiod (AP) group and a continuous light (LL) group, were studied from August to February...
January 1, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/27497664/kisspeptin2-stimulates-the-hpg-axis-in-immature-nile-tilapia-oreochromis-niloticus
#8
Jin Woo Park, Ye Hwa Jin, Sung-Yong Oh, Joon Yeong Kwon
It has been suggested that kisspeptin influences reproduction and onset of puberty in fishes. Unlike mammals, which produce only one kisspeptin (Kiss1), some teleosts have two, Kiss1 and Kiss2, both thought to be involved in the stimulation of gonadotropin (GTH) secretion. In Nile tilapia (Oreochromis niloticus), however, only Kiss2 has been identified so far. The effect of Kiss2 on GTH release varies significantly depending on species and reproductive stage. Furthermore, its physiological function in this species is not clearly defined...
August 3, 2016: Comparative Biochemistry and Physiology. Part B, Biochemistry & Molecular Biology
https://www.readbyqxmd.com/read/27484136/endocrine-effects-of-real-life-mixtures-of-persistent-organic-pollutants-pop-in-experimental-models-and-wild-fish
#9
Vidar Berg, Marianne Kraugerud, Rasoul Nourizadeh-Lillabadi, Pål A Olsvik, Janneche U Skåre, Peter Alestrøm, Erik Ropstad, Karin Elisabeth Zimmer, Jan L Lyche
A series of studies have assessed the occurrence, levels, and potential adverse effects of persistent organic pollutants (POP) in fish from Lake Mjøsa. In this lake, high levels of various POP were detected in biota. Fish from the nearby Lake Losna contain background levels of POP and served as reference (controls) in these studies. Significantly higher prevalence of mycobacteriosis and pathological changes were documented in burbot (Lota lota) from Mjøsa compared to burbot from Losna. Further, transcriptional profiling identified changes in gene expression in burbot from Mjøsa compared to burbot from Losna associated with drug metabolism enzymes and oxidative stress...
2016: Journal of Toxicology and Environmental Health. Part A
https://www.readbyqxmd.com/read/27355207/targeted-mutagenesis-of-the-hypophysiotropic-gnrh3-in-zebrafish-danio-rerio-reveals-no-effects-on-reproductive-performance
#10
Olivia Smith Spicer, Ten-Tsao Wong, Nilli Zmora, Yonathan Zohar
Gnrh is the major neuropeptide regulator of vertebrate reproduction, triggering a cascade of events in the pituitary-gonadal axis that result in reproductive competence. Previous research in mice and humans has demonstrated that Gnrh/GNRH null mutations result in hypogonadotropic hypogonadism and infertility. The goal of this study was to eliminate gnrh3 (the hypophysiotropic Gnrh form) function in zebrafish (Danio rerio) to determine how ontogeny and reproductive performance are affected, as well as factors downstream of Gnrh3 along the reproductive axis...
2016: PloS One
https://www.readbyqxmd.com/read/27348263/developmental-exposure-to-progestins-causes-male-bias-and-precocious-puberty-in-zebrafish-danio-rerio
#11
Johan Svensson, Arshi Mustafa, Jerker Fick, Monika Schmitz, Björn Brunström
Progestins are aquatic contaminants that in low concentrations can impair fish reproduction. The mechanisms are likely multiple since different progestins interact with other steroid receptors in addition to progesterone receptors. Puberty is the process when animals first acquire the capability to reproduce and it comprises maturation of sperm and eggs. In zebrafish, puberty is initiated around 45days post fertilization (dpf) in females and around 53-55 dpf in males, and is marked by increased production of pituitary gonadotropins...
August 2016: Aquatic Toxicology
https://www.readbyqxmd.com/read/27255368/effects-of-thyroid-endocrine-manipulation-on-sex-related-gene-expression-and-population-sex-ratios-in-zebrafish
#12
Prakash Sharma, Song Tang, Gregory D Mayer, Reynaldo Patiño
Thyroid hormone reportedly induces masculinization of genetic females and goitrogen treatment delays testicular differentiation (ovary-to-testis transformation) in genetic males of Zebrafish. This study explored potential molecular mechanisms of these phenomena. Zebrafish were treated with thyroxine (T4, 2nM), goitrogen [methimazole (MZ), 0.15mM], MZ (0.15mM) and T4 (2nM) (rescue treatment), or reconstituted water (control) from 3 to 33days postfertilization (dpf) and maintained in control water until 45dpf...
September 1, 2016: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/27237813/metabolic-and-reproductive-parameters-in-prepubertal-gilts-after-omega-3-supplementation-in-the-diet
#13
F Moreira, Z M G Cheuiche, G Rizzoto, M Q Santos, M S Schuch, M J Flach, B G Gasperin, I Bianchi, T Lucia
Polyunsaturated fatty acids may benefit reproductive performance of female swine. This study evaluated metabolic and reproductive parameters of prepubertal finishing gilts fed with fish oil as a natural source of omega-3 fatty acids (6.88g/d) (n=12) over a period of 45 d. Gilts in the control group were fed soybean oil (n=13). Body weight and backfat were determined at 15-d intervals. Serum levels of leptin, IGF-1, insulin, cholesterol and triglycerides were measured at the beginning (D0) and at the end of the period (D45)...
July 2016: Animal Reproduction Science
https://www.readbyqxmd.com/read/27164487/is-the-kisspeptin-system-involved-in-responses-to-food-restriction-in-order-to-preserve-reproduction-in-pubertal-male-sea-bass-dicentrarchus-labrax
#14
Sebastián Escobar, Alicia Felip, Silvia Zanuy, Manuel Carrillo
Previous works on European sea bass have determined that long-term exposure to restrictive feeding diets alters the rhythms of some reproductive/metabolic hormones, delaying maturation and increasing apoptosis during gametogenesis. However, exactly how these diets affect key genes and hormones on the brain-pituitary-gonad (BPG) axis to trigger puberty is still largely unknown. We may hypothesize that all these signals could be integrated, at least in part, by the kisspeptin system. In order to capture a glimpse of these regulatory mechanisms, kiss1 and kiss2 mRNA expression levels and those of their kiss receptors (kiss1r, kiss2r) were analyzed in different areas of the brain and in the pituitary of pubertal male sea bass during gametogenesis...
September 2016: Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
https://www.readbyqxmd.com/read/27088601/molecular-characterization-of-kisspeptin-gene-and-effect-of-nano-encapsulted-kisspeptin-10-on-reproductive-maturation-in-catla-catla
#15
M A Rather, I A Bhat, P Gireesh-Babu, A Chaudhari, J K Sundaray, R Sharma
Kisspeptin, a member of the RF-amide-related peptide family, has emerged recently as an essential gatekeeper of various reproductive processes via its ability to activate kisspeptin receptors at puberty. In this study, the kiss1 gene and its receptor kiss1rb were cloned and characterized from the brain of Catla catla. Further, the effects of kissppetin-10 (K-10) and chitosan-encapsulated K-10 nanoparticles (CK-10) on gene expression were assessed. The full-length complementary DNA sequence of kiss1 is 754 bp with an open reading frame of 351 bp that encodes a putative protein of 116 amino acids...
July 2016: Domestic Animal Endocrinology
https://www.readbyqxmd.com/read/27084093/associations-between-school-meal-induced-dietary-changes-and-metabolic-syndrome-markers-in-8-11-year-old-danish-children
#16
Camilla T Damsgaard, Christian Ritz, Stine-Mathilde Dalskov, Rikard Landberg, Ken D Stark, Anja Biltoft-Jensen, Inge Tetens, Arne Astrup, Kim F Michaelsen, Lotte Lauritzen
PURPOSE: We recently showed that provision of Nordic school meals rich in fish, vegetables and potatoes and with reduced intakes of fat improved blood pressure, insulin resistance assessed by the homeostatic model (HOMA-IR), and plasma triacylglycerol despite increasing waist circumference in Danish 8-11-year-olds. This study explored whether intake or biomarkers of key dietary components in the schools meals were associated with these metabolic syndrome (MetS) markers during the 6-month intervention...
August 2016: European Journal of Nutrition
https://www.readbyqxmd.com/read/26905261/identification-and-characterization-of-kiss2-and-kissr2-homologs-in-paralichthys-olivaceus
#17
Huayu Song, Mengxun Wang, Zhongkai Wang, Haiyang Yu, Zhigang Wang, Quanqi Zhang
The role of kisspeptin in puberty onset has been extensively investigated by neuroendocrinologists in the past decade. In the present study, we first cloned and analyzed Pokiss2 and Pokissr2 genes in Paralichthys olivaceus, a Pleuronectiformes fish. By 5'/3' rapid amplification of cDNA ends (RACE), the P. olivaceus kiss2 gene (Pokiss2) and two isoforms of the P. olivaceus kissr2 gene (Pokissr2) transcripts were cloned. During development, Pokissr2 was maternally inherited but Pokiss2 was not, and their expression reached maximum and minimum levels, respectively, when the gonads began to develop...
August 2016: Fish Physiology and Biochemistry
https://www.readbyqxmd.com/read/26641263/photoperiodic-modulation-of-circadian-clock-and-reproductive-axis-gene-expression-in-the-pre-pubertal-european-sea-bass-brain
#18
Rute S T Martins, Ana Gomez, Silvia Zanuy, Manuel Carrillo, Adelino V M Canário
The acquisition of reproductive competence requires the activation of the brain-pituitary-gonad (BPG) axis, which in most vertebrates, including fishes, is initiated by changes in photoperiod. In the European sea bass long-term exposure to continuous light (LL) alters the rhythm of reproductive hormones, delays spermatogenesis and reduces the incidence of precocious males. In contrast, an early shift from long to short photoperiod (AP) accelerates spermatogenesis. However, how photoperiod affects key genes in the brain to trigger the onset of puberty is still largely unknown...
2015: PloS One
https://www.readbyqxmd.com/read/26593912/leptin-genes-in-blunt-snout-bream-cloning-phylogeny-and-expression-correlated-to-gonads-development
#19
Honghao Zhao, Cong Zeng, Shaokui Yi, Shiming Wan, Boxiang Chen, Zexia Gao
To investigate the leptin related genes expression patterns and their possible function during the gonadal development in fish, the cDNA and genomic sequences of leptin, leptin receptor (leptinR), and leptin receptor overlapping transcript like-1 (leprotl1) were cloned and their expression levels were quantified in the different gonadal development stages of Megalobrama amblycephala. The results showed that the full length cDNA sequences of leptin, leptinR and leprotl1 were 953, 3432 and 1676 bp, coding 168, 1082, and 131 amino acid polypeptides, and the genomic sequences were 1836, 28,528 and 5480 bp, which respectively had 3, 15 and 4 exons, respectively...
2015: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/26551894/the-vgll3-locus-controls-age-at-maturity-in-wild-and-domesticated-atlantic-salmon-salmo-salar-l-males
#20
Fernando Ayllon, Erik Kjærner-Semb, Tomasz Furmanek, Vidar Wennevik, Monica F Solberg, Geir Dahle, Geir Lasse Taranger, Kevin A Glover, Markus Sällman Almén, Carl J Rubin, Rolf B Edvardsen, Anna Wargelius
Wild and domesticated Atlantic salmon males display large variation for sea age at sexual maturation, which varies between 1-5 years. Previous studies have uncovered a genetic predisposition for variation of age at maturity with moderate heritability, thus suggesting a polygenic or complex nature of this trait. The aim of this study was to identify associated genetic loci, genes and ultimately specific sequence variants conferring sea age at maturity in salmon. We performed a genome wide association study (GWAS) using a pool sequencing approach (20 individuals per river and phenotype) of male salmon returning to rivers as sexually mature either after one sea winter (2009) or three sea winters (2011) in six rivers in Norway...
November 2015: PLoS Genetics
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