Project description:The stem cell lines were generated according to the principle described in Noggle et al., Nature 2011, Oct 5;478(7367):70-5. doi: 10.1038/nature10397. Title: Human oocytes reprogram somatic cells to a pluripotent state. Abstract: The exchange of the oocyte's genome with the genome of a somatic cell, followed by the derivation of pluripotent stem cells, could enable the generation of specific cells affected in degenerative human diseases. Such cells, carrying the patient's genome, might be useful for cell replacement. Here we report that the development of human oocytes after genome exchange arrests at late cleavage stages in association with transcriptional abnormalities. In contrast, if the oocyte genome is not removed and the somatic cell genome is merely added, the resultant triploid cells develop to the blastocyst stage. Stem cell lines derived from these blastocysts differentiate into cell types of all three germ layers, and a pluripotent gene expression program is established on the genome derived from the somatic cell. This result demonstrates the feasibility of reprogramming human cells using oocytes and identifies removal of the oocyte genome as the primary cause of developmental failure after genome exchange. The major difference to Noggle et al. are that these new stem cell lines are tetraploid rather than diploid. The main technical difference is the addition of cytochalasinB during artificial activation, preventing extrusion of the second polar body, thereby resulting in the retention of a diploid oocyte genome, rather than a haploid one. Adult somatic cells were transferred into non-enucleated oocytes and then activated in the presence of cytochalasinB. Addition of cytochalasinB inhibits extrusion of the second polar body, resulting in tetraploid eggs. The efficiency of development to the blastoycst stage is described in: Yamada et al., 2014, Human oocytes reprogram adult somatic nuclei of a type 1 diabetic to diploid pluripotent stem cells, Nature. 2014 Jun 26;510(7506):533-6. doi: 10.1038/nature13287. Blastocysts developing from these were used for the derivation or pluripotent stem cell lines. Gene expression analysis was performed to demonstrate transcriptional reprogramming. These cell lines contain both somatic and oocyte genomes.

Project description:The transfer of somatic cell nuclei into oocytes can give rise to pluripotent stem cells, holding promise for autologous cell replacement therapy. Though reprogramming of somatic cells by nuclear transfer was first demonstrated more than 60 years ago, only recently have human diploid embryonic stem cells been derived after nuclear transfer of fetal and neonatal fibroblasts. Because of the therapeutic potential of developing diploid embryonic stem cell lines from adult cells of normal and diseased human subjects, we have systematically investigated the parameters affecting efficiency and developmental potential in their derivation. We found that improvements to the oocyte activation protocol, including the use of both a kinase and a translation inhibitor, and cell culture in the presence of histone deacetylase inhibitors enable development of diploid cells to the blastocyst stage. Developmental efficiency varied significantly between oocyte donors, and was inversely related to the number of days of hormonal stimulation required to reach mature oocytes, while the daily dose of gonadotropin or the total number of MII oocytes retrieved did not affect developmental outcome. The use of diluted Sendai virus in calcium-free medium during nuclear transfer improved developmental potential, while the use of concentrated Sendai virus induced an increase in intracellular calcium and caused premature oocyte activation. Using these modifications to the nuclear transfer protocol, we successfully derived diploid pluripotent stem cell lines from both postnatal and adult somatic cells of a type 1 diabetic subject. The goal of this experiment was to determine if human oocytes have the ability to reprogram a somatic cell genome in the absence of the oocyte genome. Our previous research had indicated that human oocytes can reprogram adult somatic cells if the oocyte genome remains present (Noggle et al. Nature 2011, doi:10.1038/nature10397). The data presented here is part of a new series of experiments aimed at obtaining diploid cells after somatic cell nuclear transfer into enucleated oocytes. In this experiment, adult somatic cells were transferred into enucleated oocytes and thereafter cultured in the presence of 240ng/ml scriptaid for 17 hours. Samples were cultured until cleavage stage and then collected for microarray analysis.

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