Gene-polymorphisms Relating to Human Subfertility
Estradiol is synthesized by granulosa cells of ovaries under control of follicle-stimulating hormone (FSH) and luteinizing hormone (LH). It is known that Estradiol plays a crucial role in maturation and fertilization of oocytes. Furthermore it is involved in development of secondary female sexual organs, fertility and maintenance of pregnancy.
Estradiol influences these processes by binding to estradiol receptors (ER). They are ligand-depending transcription-factors. In humans there are two subtypes: ERa and ERb, which are synthetized from gene ESR1 on chromosome 6 and ESR2 on chromosome 14. Both subtypes are expressed in the ovary. Both genes are polymorph. Especially for ERa subtype several polymorphisms and mutations are known which can be linked to breast cancer, spontaneous abortions, osteoporosis and the point in time of menarche. Furthermore some studies have shown a relationship between certain polymorphisms and the risk of infertility associated gynecological malfunctions and the result of IVF treatments.
Progesterone is a hormone which plays a crucial role in initiation and maintenance of pregnancy. It induces the transformation of the endometrium, which facilitates the implantation of the fertilized oocyte and supports the pregnancy. Progesterone acts by binding to its receptor. The gene for this receptor is polymorph within the population, whereas some variants seem to account for implantation failure of embryos.
In the investigators study the investigators will analyse the role of ERP and PRP polymorphisms in the context of IVF treatment. The analyzed genotypes are two polymorphisms of ESRI, called Pvu and Xba, as well as a variant of ESRII, ER2. In the progesterone receptor gene a single nucleotide exchange at position +331 (G->A) plays a role.
The parameters correlated with are concentrations of estradiol, progesterone and FSH, number of follicles, number of fertilized oocytes and pregnancy rate.
The investigators hope to optimize established treatment protocols and to improve the chances of success of IVF treatments depending on the genotype of the patient.
Estradiol Receptor Polymorphism
Progesterone Receptor Polymorphism
|Study Design:||Observational Model: Case Control|
|Official Title:||Analysis of Gene-polymorphisms Relating to Human Subfertility: Estradiol-receptor-polymorphism and Progesterone-receptor-polymorphism|
- genetic testing for two estrogene receptor genes, correlating to numbers of oocytes retrieved at oocyte punction after hormonal stimulation [ Time Frame: 30.06.2013 ] [ Designated as safety issue: No ]
Biospecimen Retention: Samples With DNA
|Study Start Date:||October 2010|
|Study Completion Date:||March 2015|
|Primary Completion Date:||March 2015 (Final data collection date for primary outcome measure)|
females with >15 follicles or E2>3000 after treatment with gonadotropins
patients with <3 follicles or no response to treatment with gonadotropins
females with an indication for treatment because of male subfertility
Please refer to this study by its ClinicalTrials.gov identifier: NCT01385618
|Infertility treatment center Dortmund|
|Dortmund, NRW, Germany, 44135|
|Principal Investigator:||Andreas Neuer||Infertility Treatment Center Dortmund|