• Hermaphroditic gonads contained testis and ovaries inside the same sacs. (conicet.gov.ar)
  • In the developing male (XY) gonad, sex-determining region of the Y (SRY) protein acts to up-regulate expression of the related gene, SOX9 , a transcriptional regulator that in turn initiates a downstream pathway of testis development, whilst also suppressing ovary development. (plos.org)
  • Analysis of XY byg/byg gonads at 11.5 d post coitum reveals a growth deficit and a failure to support mesonephric cell migration, both early cellular processes normally associated with testis development. (plos.org)
  • In mammals, whether an individual develops as a male or female depends on its sex chromosome constitution: those with a Y chromosome become males because of the development of the embryonic gonad into a testis. (plos.org)
  • Our data indicate, for the first time, a requirement for MAPK signaling in the developing XY gonad in order to facilitate normal expression of SRY and the downstream testis-determining genes and also suggest that reduced dosage of MAP3K4 may be the cause of a previously described autosomal sex-reversing mutation in the mouse. (plos.org)
  • The ovary is found in the anterior portion of the gonad, and the testis is found in the posterior part. (mnhn.fr)
  • The gonads present may be bilateral ovotestes, or they may be a combination of a unilateral ovary or testis with an ovotestis on the contralateral side. (medscape.com)
  • The development of the gonads is part of the prenatal development of the reproductive system and ultimately forms the testes in males and the ovaries in females. (wikipedia.org)
  • In the typical developing gonad, cells with XY chromosomes become masculinised into Sertoli cells, leading to the development of the bipotential gonad into testes. (eurospe.org)
  • In birds, switching off GnRH causes the gonads - the testes and ovary - to shrink as part of the birds' yearly cycle. (nbcnews.com)
  • These individuals usually have a uterus and fallopian tubes, but their gonads (ovaries or testes) are not functional. (medlineplus.gov)
  • Testes are usually found in the scrotum, although they can be found at any level along the path of embryonic descent from abdomen to scrotum, frequently presenting as inguinal hernias. (medscape.com)
  • Ovaries, when found, can occupy the normal abdominal position, although they may occasionally be found at the internal inguinal ring. (medscape.com)
  • Ultrasound imaging technology accurately differentiated between digestive and reproductive tissues, allowing for the characterization of an ultrasound gonad index score for rapid assessment. (frontiersin.org)
  • Gonad condition provides powerful reproductive information for conservation and production aquaculture programs. (frontiersin.org)
  • Gonads are the principal reproductive organs that are involved in sexual differentiation wherein they are involved in the production of sex hormones and gametes. (peerj.com)
  • If trade-offs exist between somatic growth and reproduction for this species, a reduction in the physiological condition of swamp fish should be accompanied by reduced development of reproductive tissue (gonad mass), as found in other fish (Wu et al. (researchgate.net)
  • Mean gonad thickness determined via ultrasound imaging was categorized on a scale of 1-5, with an index of 1 being the lowest (gonad tissue thin or absent) and an index of 5 being the highest (gonad margin has increased and is compressing the digestive gland) for red abalone. (frontiersin.org)
  • More rarely, masses associated with aberrant parathyroid or thyroid tissue are found. (medscape.com)
  • Instead, the gonads are small and underdeveloped and contain little gonadal tissue. (medlineplus.gov)
  • A diagnosis of OT-DSD is based solely on the presence of ovarian and testicular tissue in the gonad and not on the characteristics of the internal and external genitalia, even if ambiguous. (medscape.com)
  • Ultrasound imaging technology was successful in rendering a gonad index score that can be used to track gonad maturation over time in cultured or captive species. (frontiersin.org)
  • this reduction may be due to an increase in testosterone levels and testosterone to estradiol ratio, which will affect gonad maturation (Friesen et al. (researchgate.net)
  • The gonadal ridge, in turn, develops into a gonad. (wikipedia.org)
  • Moreover, we describe experiments showing the presence of activated MKK4, a direct target of MAP3K4, and activated p38 in the coelomic region of the XY gonad at 11.5 d post coitum, establishing a link between MAPK signalling in proliferating gonadal somatic cells and regulation of Sry expression. (plos.org)
  • The animal becomes female if the cranial part of the gonad develops or male if the caudal part undergoes differentiation. (mnhn.fr)
  • They removed all melatonin-producing organs from the birds - the eyes and the pineal glands - and found GnIH levels fell. (nbcnews.com)
  • Tetrodotoxin is an extremely potent poison (toxin) found mainly in the liver and sex organs (gonads) of some fish, such as puffer fish, globefish, and toadfish (order Tetraodontiformes) and in some amphibian, octopus, and shellfish species. (cdc.gov)
  • Analysis of embryonic XY gonads suggests that sex reversal is caused by delayed and reduced expression of the sex-determining gene SRY . (plos.org)
  • The liver, gonads, intestines, and skin of these fish contain tetrodotoxin, a powerful neurotoxin that can cause death in approximately 60% of persons who ingest it (2). (cdc.gov)
  • The species was found to be a brooding simultaneous hermaphrodite. (conicet.gov.ar)
  • In the present study, we found that ogerin differentially enhances the activation of OGR1 in various animal species. (bioone.org)
  • But we found that in this species of temperate fish - the common triplefin - both males and females had larger gonads under conditions of ocean acidification. (earth.com)
  • We also found there were more mature males under elevated CO2 and, in this species where it is the males that take care of the eggs, that means we have more parents nurturing the egg nests, which could increase offspring. (earth.com)
  • Researchers at the George Washington University, led by Michael S. Irwig, M.D., found that men referred for tertiary care for borderline testosterone levels had much higher rates of depression and depressive symptoms than those of the general population. (news-medical.net)
  • Testosterone (T) therapy is routinely used in men with hypogonadism, a condition in which diminished function of the gonads occurs. (news-medical.net)
  • One advantage is, testosterone is found both in the gonads and the scrotum. (glidercentral.net)
  • In the current study, we sequenced two small non-coding RNA libraries made from the gonads of adult male and female budgerigars using Illumina paired-end sequencing technology. (peerj.com)
  • Germ cells migrate from near the allantois and colonize the primordial gonads. (wikipedia.org)
  • About 80% of all extragonadal germ cell tunors are found in the mediastinum. (medscape.com)
  • The most common tumors found in the anterior mediastinum are of thymic, lymphatic, or germ cell origin. (medscape.com)
  • In a stress regulation test using the cortisone drug dexamethasone, men with hypersexual disorder showed higher levels of stress hormones than controls, a finding that the researchers hope will contribute to improved therapy for this patient group. (news-medical.net)
  • The researchers found that higher levels of ocean acidification did not have negative effects on the fish. (earth.com)
  • On April 5, neonics were found in drinking water for the first time ever-runoff from Iowa's cornfields turned up in treated tap water-though researchers told the Washington Post the amount was probably too miniscule to pose any risk to human health. (motherjones.com)
  • It is likely to affect human gonads as well, the researchers said. (nbcnews.com)
  • What did the researchers do and find? (bvsalud.org)
  • it could also cause longer gonad development rate and consequently result in asynchronous breeding seasons between hypoxic and normoxic populations (Friesen et al. (researchgate.net)
  • Ovotesticular disorder of sexual development, which was previously termed "intersex," describes disorders in which there is a discrepancy between a person's phenotype, genetic material, and gonads. (medscape.com)
  • Such gonads are found exclusively in people with ovotesticular disorder of sexual development (OT-DSD), formerly known as true hermaphroditism. (medscape.com)
  • Internal duct development usually corresponds to the adjacent gonad. (medscape.com)
  • Could play a role in T-cell development, gonad and neurological function. (lu.se)
  • For example, in the mouse, NANOS2 plays a role in meiosis suppression by preventing Stra8 expression in male foetal gonads 4 . (nature.com)
  • Similarly, we found that male GSI was reduced in fish from hypoxic sites compared with fish from normoxic sites. (researchgate.net)
  • Following initial gonad ultrasound determination, a subset of another cohort of 5 year-old ( n = 62) red abalone produced at the UC Davis Bodega Marine Laboratory were monitored using ultrasonography to detect seasonal changes in gonad size for 7 weeks. (frontiersin.org)
  • Following the 7-week assessment period, the full cohort of 5-year old abalone ( n = 122) were then spawned and gonads were also evaluated using ultrasound technology before and immediately after spawning. (frontiersin.org)
  • eggs may be found attached to objects in the water by tendrils on the egg's surface. (calvertmarinemuseum.com)
  • Fry and Toone (1986) found when they inject fertilised seabird eggs with DDT and its metabolites. (benjaminbarber.org)
  • Occurring in huge numbers, Moon Jellyfish are the most common jellyfish found around British coasts. (visitsealife.com)
  • There are four horseshoe-shaped gonads that are found at the top of the bell for the Moon Jellyfish. (visitsealife.com)
  • We found that the relative abundances of only six chemicals were different between the sexes, although males tended to have larger amounts of particular compounds. (researchgate.net)
  • We found males were eating more. (earth.com)
  • Segmental neurofibromatosis results from a postzygotic mutation that occasionally may involve the gonads [ 1 ]. (cdlib.org)
  • However, variants (also known as mutations) in one of several genes have been found to cause the condition in some affected individuals. (medlineplus.gov)
  • Our study opens new perspectives concerning the complex evolution of nanos1 paralogs and their potential distinct roles in Vertebrates gonads. (nature.com)
  • Bentley said the team has found a gene for a hormone like GnIH in hamsters, and he found evidence of a GnIH gene in the map of the human genome. (nbcnews.com)
  • Variants in the SRY gene have been found in approximately 15 percent of individuals with Swyer syndrome. (medlineplus.gov)
  • Expression analysis of mutant XY gonads at the same stage also reveals a dramatic reduction in Sox9 and, crucially, Sry at the transcript and protein levels. (plos.org)
  • The reduction in penis length and the abnormal gonads made the hatchlings reproductively incapable. (benjaminbarber.org)
  • They can be found in all of our oceans and sometimes in freshwater too. (visitsealife.com)
  • Then, search on any target organ system to find the health effects information on that system. (cdc.gov)
  • Enter search terms to find related medical topics, multimedia and more. (msdmanuals.com)
  • The left gonad was positioned in the left inguinal canal, since the diagnosis of CAIS was made intraoperatively and the family had not previously consented to a surgical sterilization. (bvsalud.org)
  • Research on the sex-biased expression of miRNAs in avian gonads are limited, and little is known about M. undulatus . (peerj.com)
  • Flt-3 expression has been detected in various tissues, including placenta, gonads, and tissues of nervous and hematopoietic origin. (rndsystems.com)
  • Between the cells of the germinal epithelium a number of larger cells, the immature ova, are found. (wikipedia.org)
  • The gonads grow from cells around the equator of the colony. (erasingdavid.com)
  • A new study that investigated the potential of certain psychological traits for predisposing heterosexuals to have negative attitudes towards homosexual people found that psychoticism--which is present in severe psychopathological conditions but may also contribute to less severe states of hostility and anger--and immature defense mechanisms may be important risk factors for homophobia, while depression and neurotic defense mechanisms appear to lower the risk of being homophobic. (news-medical.net)
  • Should they be found to pose a significant risk to human health or the environment, the EPA will have two years to "mitigate" these risks. (motherjones.com)
  • Scientists have found suggestive evidence associating atrazine with human diseases such as hairy-cell leukemia, though according to the Centers for Disease Control and Prevention, there's not enough information to determine whether the pesticide causes cancer. (motherjones.com)
  • She's a hard-drinking, sexually promiscuous post-feminist San Francisco homicide cop looking for Mr. Goodbar and finding another (yawn) serial killer on the rampage. (observer.com)
  • Tracking ultrasound gonad scores over time is a useful tool for improving abalone culture production, and increasing animal welfare by reducing handling stress associated with gonad assessments. (frontiersin.org)
  • I have been trying to help quite a lot of people lately with neutering questions so I thought maybe it was time to start a thread on what I am finding to be the most FAQ. (glidercentral.net)
  • This population showed a relatively high gonadosomatic index (maximum GI of 8), high gonad weight (5.00-12.19 g) with high proportion of bright yellow and orange gonads (37.5-60%) between February and November. (frontiersin.org)
  • After controlling for the effect of body size, we found no significant difference in energetic organ mass among different age classes for each of the three populations. (usgs.gov)
  • Plenty in Life is Free: Reflections on Dogs, Training, and Finding Grace" is a guide to training one's dog through granting a dog leadership, through reinforcing good behavior instead of trying to force the dogs behavior. (dogwise.com)
  • The Gonads and Infa-Riot are releasing a limited edition seven inch single which will be given away free with the Randalierer fanzine in Germany. (the-gonads.co.uk)
  • Scientists from the University of Leeds are investigating whether a molecule usually found in moisturisers and skin creams could improve IVF success rates in the UK. (news-medical.net)
  • Gonad assessments in aquatic organisms are traditionally invasive procedures and may induce significant handling stress and lead to mortality. (frontiersin.org)
  • Find support for a specific problem in the support section of our website. (mdpi.com)