Project description:We found distinct and self-renewal cell linages that could differentiate into melanocytes, named melanocyte precursor cells (MPCs) in which MPCs revealed drastically differntiation to authentic melanocytes by a small amount of GSK3β inhibitor in about seven days. Comparing MPCs ,iPSCs and melanocytes, we showed wnt sigal systems in differentiation to melanocytes.
Project description:We found distinct and self-renewal cell linages that could differentiate into melanocytes, named melanocyte precursor cells(MPCs) in which MPCs revealed drastically differntiation to authentic melanocytes by a small amount of GSK3β inhibitor in about seven days. Comparing MPCs ,iPSCs and melanocytes, we showed wnt sigal systems in differentiation to melanocytes.
Project description:To elucidate frequencies of genomic structural alterations, we performed an analysis using a SNP genotyping array (Illumina HumanCytoSNP-12 v2.1 DNA Analysis BeadChip Kit) for iPS cells derived from xeroderma pigmentosum patients (XP3OS, XP40OS, and XPEMB-1). Samples were collected after 10 to 25 passages to detect structural mutations occurred during the cell cultivation processes. Our results suggested a higher mutation rate of the iPS cells compared to those from normal cells. The iPS-cell samples were collected after several passages togerther with their precursor cell samples and subjected to the SNP genotyping array. We searched for structural mutations occurred during the culture of the iPS cells.
Project description:Melanocytes are pigment-producing cells of neural crest origin responsible for protecting the skin against UV-irradiation. Melanocyte dysfunction leads to pigmentation defects including albinism, vitiligo, and piebaldism and is a key feature of systemic pathologies such as Hermansky-Pudlak (HP) and Chediak-Higashi (CH) Syndromes. Pluripotent stem cell technology offers a novel approach for studying human melanocyte development and disease. Here we report that timed exposure to activators of WNT, BMP and EDN3 signaling triggers the sequential induction of neural crest and melanocyte precursor fates under dual-SMAD inhibition conditions. Using a SOX10::GFP hESC reporter line, we demonstrate that the temporal onset of WNT activation is particularly critical for human neural crest induction. Surprisingly, suppression of BMP signaling does reduce neural crest yield. Subsequent differentiation of hESC-derived melanocyte precursors under defined conditions yields pure populations of pigmented cells matching the molecular and functional properties of adult melanocytes. Melanocytes from patient-specific iPSCs faithfully reproduce the ultrastructural features of the HP- and CH-specific pigmentation defects with minimal variability across lines. Our data define a highly specific requirement for WNT signaling during neural crest induction and enable the generation of pure populations of hiPSC-derived melanocytes for faithful modeling of human pigmentation disorders. Total RNA obtained from embryonic stem cells (ESCs), ESC-derived melanocyte progenitors, ESC-derived mature melanocytes, primary melanocytes, and disease-specific induced pluripotent stem cell-derived melanocytes.
Project description:Transcriptional profiling of human iPS-HSCs overexpressing LHX2 compared with control iPS-HSCs, which were cocultured with human induced pluripotent stem cell-derived hepatic progenitor cells (iPS-HPCs).
Project description:This experiment was designed to show the similarity among normal human epidermal melanocytes, melanocytes derived from human 3F-induced pluripotent stem (iPS) cells, and human 3F-iPS cells.
Project description:Genome-wide DNA methylation of early and late passaged keratinocyte-derived iPS cells were compared to ES cells. We used custom Nimblegen microarrays to determine the genome-wide DNA methylation in human keratinocyte-derived iPS cells and ES cells