Donor egg

Precise, on-target CRISPR-Cas9 genome editing has been shown in Schistosoma mansoni, involving both non-homology end joining and homology-directed repair pathways. Here, we present a multiplexed CRISPR-Cas9 protocol for large transgene integration into the S. mansoni genome. We describe steps for deploying multiplexed ribonucleoprotein complexes (RNPs) and donor DNA preparation. We then detail procedures for introducing RNPs into schistosome eggs by square-wave electroporation in the presence of a 5' phosphorothioate-modified double-stranded donor transgene...

OBJECTIVE: To report pregnancy and live birth resulting from intracytoplasmic sperm injection of ex vivo retrieved mature oocytes from a woman with bilateral ovarian carcinoma. DESIGN: Case report. SUBJECT(S): A 34-year-old nulliparous woman with bilateral ovarian tumor, with a risk of malignancy at 96.1% according to IOTA-ADNEX, who desired fertility preservation before definitive surgical treatment. INTERVENTION(S): Cryopreservation of ex vivo retrieved mature (MII) oocytes followed by fertilization with donor sperm, and embryo transfer to a gestational carrier...

Oocyte donation has greatly expanded in the past several decades since the first procedure was performed in 1983. According to the Centers for Disease Control, the number of cycles using donor oocytes increased from 18,011 cycles in 2010 to 27,131 cycles in 2019. Oocyte donation has become an important reproductive option for women with diminished ovarian reserve, recurrent failed in vitro fertilization, or heritable genetic conditions. It is also particularly important for single men, same-sex male couples, and men with a transgender woman partner...

OBJECTIVE: To determine the minimum follicular volume on the day of trigger that will correspond to a mature oocyte at egg retrieval by individualized follicular puncture and to calculate the mean follicular growth from ovulation induction to egg retrieval by SonoAVC™follicle. DESIGN: Prospective observational study of 53 women undergoing IVF, in which it was possible to identify unequivocally one or more follicles at trigger and at egg retrieval by three-dimensional ultrasound...

INTRODUCTION: Assisted Reproductive Technology utilizes human sperm, eggs, or embryos in vitro to produce pregnancy. However, there is no evidence of the acceptance of these technologies by the community. OBJECTIVE: This study aimed to determine the pooled prevalence of positive attitudes toward the acceptance of donor eggs, embryos, and sperm. METHODS: The protocol was registered in PROSPERO (number: CRD42022348036). The Condition, Context and Population (CoCoPop) protocol of the systematic review was used to address the relevant questions regarding the objective of the study...

The Louisiana pinesnake (Pituophis ruthveni) is considered one of the rarest snakes in North America and was federally listed under the Endangered Species Act in 2018. Captive breeding and reintroduction of zoo-bred hatchlings has been successful, however, limited founders in the captive population and the inability to bring new, wild genes into the captive colony presents a major concern for the conservation of this species. The use of artificial insemination (AI) was first applied to snakes in the 1980s but further development of the technique has since received little attention...

There is no FDA-approved drug for neurological disorders like spinocerebellar ataxia type 3. CAG repeats mutation in the ATXN3 gene, causing spinocerebellar ataxia type 3 disease. Symptoms include sleep cycle disturbance, neurophysiological abnormalities, autonomic dysfunctions, and depression. This research focuses on drug discovery against ATXN3 using phytochemicals of different plants. Three phytochemical compounds (flavonoids, diterpenoids, and alkaloids) were used as potential drug candidates and screened against the ATXN3 protein...

OBJECTIVE: To describe characteristics, trends, and outcomes of international gestational surrogacy cycles in the United States (US). DESIGN: Retrospective cohort study. SUBJECTS: All assisted reproductive technology cycles in the US reported to the Society for Assisted Reproductive Technology Clinic Outcome Reporting Systems that included an embryo transfer to a gestational carrier from 2014-2020. EXPOSURE (FOR OBSERVATIONAL STUDIES): International versus US intended parents...

Schistosomiasis, caused by Schistosoma spp., is a zoonotic parasitic disease affecting human health. Rattus norvegicus (rats) are a non-permissive host of Schistosoma, in which the worms cannot mature and cause typical egg granuloma. We previously demonstrated that inherent high levels of nitric oxide (NO), produced by inducible NO synthase (iNOS), is a key molecule in blocking the development of S. japonicum in rats. To further explore the mechanism of NO inhibiting S. japonicum development in rats, we performed S-nitrosocysteine proteomics of S...

In New Zealand egg donation is identity-release, and donors may be known to recipients, e.g. family members/friends, or previously unknown e.g. clinic-recruited or sourced through advertising. In the case of unknown donors, New Zealand practice allows donors and recipients to meet face-to-face prior to donation in a joint counselling meeting. While contact details may not necessarily be exchanged in counselling, information-exchange and contact expectations are usually addressed. In previous papers, we explored donors' motivations and experiences of donation...

BACKGROUND: One of the well-known causes of subfertility is polycystic ovary syndrome (PCOS). Genetic components play a critical role in the etiology of PCOS. The recognition of differentially expressed genes in PCOS patients might provide a better understanding of the pathophysiology of this syndrome and paves the way for novel therapeutics. Gene expression profiles in cumulus cells (CCs) could be used as biological criteria for embryo competence and their analysis might lead to important molecular information about embryo quality...

Xenopus laevis is a widely used model organism in developmental and regeneration studies. Despite several reports regarding targeted integration techniques in Xenopus, there is still room for improvement of them, especially in creating reporter lines that rely on endogenous regulatory enhancers/promoters. We developed a CRISPR-Cas9-based simple method to efficiently introduce a fluorescent protein gene into 5' untranslated regions (5'UTRs) of target genes in Xenopus laevis. A donor plasmid DNA encoding an enhanced green fluorescent protein (eGFP) flanked by a genomic fragment ranging from 66 bp to 878 bp including target 5'UTR was co-injected into fertilized eggs with a single guide RNA and Cas9 protein...

Endometriosis is a condition in which tissue that lines the uterus grows outside the uterus. Patients with endometriosis often experience pelvic pain with menstrual periods and sometimes also infertility. Sometimes it is mistaken for pelvic inflammatory disease or ovarian cysts. This condition is a contraindication for pregnancy. This is a case report of a 37-year-old female who came to in vitro fertilisation (IVF) with a history of infertility of 14 years and was diagnosed with Grade 4 endometriosis on diagnostic ultrasonography-guided hysterolaparoscopy...

Endometrial glands secrete products into the endometrium and are necessary for embryo implantation and successful pregnancy. However, structural and functional abnormalities in endometrial gland cilia from women with reproductive failure remain poorly understood. This was a cross sectional study where endometrial biopsies were collected at days 19-23 of the menstrual cycle from women with unexplained recurrent pregnancy loss (n = 15), unexplained subfertility (n = 11) or from egg donor control participants (n = 10)...

STUDY QUESTION: Does trophectoderm biopsy (TEBx) of blastocysts for preimplantation genetic testing in the clinic affect normal placental and embryo development and offspring metabolic outcomes in a mouse model? SUMMARY ANSWER: TEBx impacts placental and embryonic health during early development, with some alterations resolving and others worsening later in development and triggering metabolic changes in adult offspring. WHAT IS KNOWN ALREADY: Previous studies have not assessed the epigenetic and morphological impacts of TEBx either in human populations or in animal models...

A personal description and goodwill message is often the only form of communication a gamete recipient receives from the donor. However, the nature of the information gamete donors leave for recipients is not well understood. This Viewpoint article discusses a recent study published in this journal that makes a significant contribution to our understanding of this area of research and raises important questions for research going forward.

RESEARCH QUESTION: Do live birth rates differ between recipients matched with donors using conventional ovarian stimulation compared with those using random-start protocols? DESIGN: Retrospective analysis of 891 ovarian stimulations in egg donors (January-December 2018) and clinical outcomes in matched recipients (n = 935). Donors commenced ovarian stimulation on day 1-3 of the menstrual cycle (n = 223) or in the mid/late-follicular (n = 388) or luteal phase (n = 280) under a conventional antagonist protocol...

RESEARCH QUESTION: What effect does direct-to-consumer genetic testing (DTCGT) have on information finding and sharing in relation to gamete donor conception? DESIGN: This study used in-depth qualitative interviews with parents through donor conception, donors, the relatives of donors and donor-conceived people who have used, or considered using, DTCGT. Interviews were conducted between September 2021 and February 2023. Sixty people defined themselves as having been affected by donor conception and DTCGT...

A synthetic octoploid rapeseed, Y3380, induces maternal doubled haploids when used as a pollen donor to pollinate plant. However, the mechanism underlying doubled haploid formation remains elusive. We speculated that double haploid induction occurs as the inducer line's chromosomes pass to the maternal egg cell, and the zygote is formed through fertilization. In the process of zygotic mitosis, the paternal chromosome is specifically eliminated. Part of the paternal gene might have infiltrated the maternal genome through homologous exchange during the elimination process...

Duo exome testing was performed on a fetus conceived via in vitro fertilization with an egg donor. The fetus presented with non-immune hydrops fetalis (NIHF) at 20 + 0 weeks gestation. Two variants were detected in the GUSB gene. Biallelic pathogenic variants cause mucopolysaccharidosis type VII (MPS-VII), which can present with NIHF prenatally. At the time of analysis and initial report, one variant was classified as likely pathogenic and the other as of uncertain clinical significance...