The Caenorhabditis elegans teneurin ortholog, ten-1, plays an important role in gonad and pharynx development. We found that lack of TEN-1 does not affect germline proliferation but leads to local basement membrane deficiency and early gonad disruption. Teneurin is expressed in the somatic precursor cells of the gonad that appear to be crucial for gonad epithelialization and basement membrane i...

During mouse development, the gonad begins to form shortly before 10. 5 days postcoitum (dpc) on the ventromedial side of the mesonephros. The XY gonad consists of germ cells and somatic cells. The origin of the germ cells is clearly established; however, the origin of the somatic cells, especially the epithelial supporting cell lineages, called Sertoli cells, is still unclear. Sertoli cells ar...

Vestimentiferan tubeworms are significant members of deep-sea chemosynthetically-driven communities, including hydrothermal vents and cold seeps. The reproductive condition in this taxon is rarely studied because of sampling constraints inherent to these environments, and the lack of a simple methodology to quantify gonad development in vestimentiferans. We demonstrate that the amount of gonad ...

In many animals, germ cells migrate to the gonad to assemble into a functional organ. Recent work in Drosophila has built a picture of the gene activities that specify the gonad and allow it to attract germ cells, and has led to the identification of a gene, columbus, that may encode the attractive factor.

Abstract Kawakawa (Euthynnus affinis) is one of the economically valuable species for Mallaca strait fishermen. This study aims to determine level gonad maturity, size fish’s first ripe gonad, and maturity index (E. caught at Tanjung Beringin’s Auction Place, Serdang Bedagai Regency, North Sumatra. Three months sampling were conducted, from July September 2021. The maturation gonads was observe...

a seventeen-years old woman was presented with infertility and primary amenorrhea. she had normal stature, femate phenotype and normal development of breasts, external genitalia, vagina and cervix. pelvic examination showed a large lobulated mass. on sonography there was a mass with probable origin of ovary. paraclinic tests were carried out. gonadotropins were in postmeno pausal limits. alpha ...

The Vilariça River was restored in order to improve the fish habitat due construction of dams. However, pressure that agriculture exerts on water resources, it is crucial evaluate its consequences health from a histological perspective. gonad histopathological changes two cyprinid species were assessed microscopically and evaluated with semi-quantitative analysis. Histopathological gonad, gill,...

Studies on the zebrafish model have contributed to our understanding of several important developmental processes, especially those that can be easily studied in the embryo. However, our knowledge on late events such as gonad differentiation in the zebrafish is still limited. Here we provide an analysis on the gene sets expressed in the adult zebrafish testis and ovary in an attempt to identify...

Concentration of heavy metals in different tissues (muscle, liver, gonad, skin, kidney) Roach (Rutilus rutilus caspicus) Guilan coasts the Caspian Sea

considering its gobiidea and feeding fish sturgeon caspian sea highest main and the need to fecundity this fish, this study was done in babolroud and tajan rivers in mazandaran. in order to conduct the study, 197 sand goby we were caught using an electros choker machine (v300-200) in the spring of 1390 ,which was the spawning season, at the tajan river (sari) and babolrood (babol). 103 fish whi...