View clinical trials related to Aneuploidy.
Filter by:This monocentric retrospective observational study aims to evaluate the efficacy of pre-implantation genetic testing for monogenic diseases (PGT-M). The effectiveness will be assessed in terms of live birth rate (LBR), cumulative live birth rate (CLBR) per couple, and abortion rate (AR). Considering how many cycles the participants have undergone to achieve a viable blastocyst. The secondary objective is to evaluate the incidence of aneuploidy in unaffected embryos, in order to understand the need for pre-implantation genetic testing for aneuploidy (PGT-A)in addition to PGT-M.
The goal of this observational study is to determine is there an association between the rates of aneuploidy and the different ranges of serum Antimullerian hormone (AMH) levels. Retrospective, single-centre study of patients undergoing IVF and preimplantation genetic testing with aneuploidy at the blastocyst stage between January 2018 and December 2022.
The investigators propose a randomized controlled trial to assess baseline maternal knowledge of and attitudes toward commercial prenatal genetic testing laboratories' genetic privacy practices, and to determine whether a brief educational intervention alters these attitudes.
There is an ongoing debate regarding how cell-free DNA (cfDNA) screening can best be incorporated into current prenatal screening algorithms for chromosomal abnormalities. Test performance of cfDNA has been shown to be better that first-trimester combined screening (FTCS). However, the cost of the cfDNA testing is considered too high to adopt as first line screening. Moreover, FTCS includes a detailed ultrasound examination of the fetus with nuchal translucency (NT) measurement that allows for early detection of fetal abnormalities. An approach in which every woman are offered an early anatomy scan along with cfDNA may also be a reasonable option. Recently a randomized controlled trial, including 1,518 women with singleton pregnancy undergoing first-trimester screening, compared the screening performance of FTCS with an approach that uses the combination of a detailed ultrasound examination and cfDNA analysis. The trial showed that first-trimester risk assessment for trisomy 21 that includes a detailed ultrasound examination along cfDNA was associated with a significant reduction in the false-positive rate compared with FTCS. This approach obviates the need for maternal serum free beta-human chorionic gonadotropin and pregnancy-associated plasma protein-A in screening for fetal aneuploidy. Despite robust evidence on the very high detection rate of cfDNA in detecting trisomy 21, literature is lacking on data regarding women's experience and emotional well-being and satisfaction after test-results of women offered cfDNA compared to those offered FTCS.
The purpose of this study is to investigate the prevalence of soft markers which will be identified during a second trimester ultrasound. Secondary aims were to estimate the association between the soft markers and trisomies 13, 18 and 21 as well as the effect on the number of invasive tests will be performed.
In general, nearly 85% of retrieved oocytes are mature and reproductively useful after the retrieval, whereas the remaining percentage are still at metaphase I or germinal vesicle stage (MI: 4% and GV: 11 %, respectively). The objective of our study is to assess if immature oocytes co-cultured with autologous cumulus cells is a safer strategy than just leaving the oocytes in standard culture.
This is a randomized controlled trial of a low income and low health literacy population of pregnant women from a diverse racial and ethnic background to assess the effectiveness of a pre-visit educational video on prenatal genetic screening and testing options.
Mosaicism within an embryo is defined as the presence of two or more cell populations with different genotypes. Blastocysts classified as mosaic by Preimplamtation Genetic Testing for Aneuploidy (PGT-A) have been reported to implant less and miscarry more frequently than embryos classified as euploid. Because of the unknown impact of mosaicism on embryo development, these embryos are given low priority and are discarded for transfer. However, recent papers on the transfer of human embryos classified by PGT-A as mosaic suggest that embryos with a low fraction of abnormal cells resulting in viable, chromosomally normal ongoing pregnancies, and high-level mosaics resulting in fewer viable pregnancies, but so far none producing mosaic babies. The apparent presence of mosaicism in an embryo is used as a selection criteria for embryo transfer (ET), introducing a strong bias in terms of patient prognosis and embryo quality. Additionally, it is also possible that some embryos are incorrectly classified as "mosaic" due to technical variability derived from the processing of a uniform aneuploid embryo. The aims of this study is to provide evidences about the clinical significance of chromosomal mosaicism in PGT-A cycles by a prospective non-selection based methodology.
Abnormal chromosome number, or aneuploidy, is common in human embryos. It is responsible for more than half of all miscarriages, and it is the leading cause of congenital birth defects. Besides, it has been described that aneuploidy may also affect embryo implantation. Therefore, selecting embryos that have the best chance of implanting and growing into a healthy baby is one of the most important steps in the field of assisted reproduction. Recent advances in genetic technologies, such as Next-Generation Sequencing (NGS), have allowed aneuploidy to be detected with greater sensitivity. The application of this technique to trophectoderm biopsies, taken from embryos before transfer to the uterus, has provided insight into the clinical impact of chromosomal status. This process of screening embryos to make sure they have the right number of chromosomes and to look for any structural abnormalities in the chromosomes is called Preimplantation Genetic Testing for Aneuploidy (PGT-A). It requires specific equipment and trained personnel that will add costs and risks, so non-invasive techniques are sought as an alternative. These non-invasive procedures have been explored by some groups analyzing the spent culture medium where the embryo is cultured up to the time of transfer or freezing. In daily routine, this media is discarded after finishing the embryo culture, but it has been reported that contains traces of embryonic cell-free DNA (cfDNA) that can represent the genetic load of the embryo. However, at the moment there is a high variability in results across studies, with a percentage of concordant results between the media and the trophectoderm biopsy ranging from 3.5 to 85.7%. Thus, the main objective of this project is to validate a new non-invasive method for PGT-A (niPGT-A), based on improved collection and analysis of the culture media to achieve higher rates of sensitivity and specificity and to decrease the effect of some intrinsic difficulties such as low embryonic cfDNA input, mosaicism and maternal contamination.
The investigators aim to assess whether use of a novel, tablet-based computerized decision aid for aneuploidy screening is similar to routine care with a brief genetic counseling visit in improving patient knowledge and decreasing decisional conflict.