Abstract
Here we describe the first report of three human embryonic stem cell (hESC) clones, hES 3.1, 3.2, and 3.3, derived from the parent line hES3 by sorting of single-cell preparations by flow cytometry. The viability of single-cell preparations before and after cell sorting remained >98%. The hESC were selected by size gating and forward-angle light scatter and were dispersed directly as single cell/ well into 96-well plates containing human fetal fibroblasts as feeder layers. Single stem cell dispersion into 96-well plates was confirmed by using cells from a hES3 line that constitutively expressed green fluorescence protein (eGFP) under similar conditions of flow cytometry. Three clones were obtained from the parent line hES3 -- hES3.1, 3.2, and 3.3 -- and they have been in continuous culture for more than 1 year. The cloning efficiency was less than <0.5%. These hESC clones show normal stem cell characteristics, such as undifferentiated growth, high nucleocytoplasmic ratio, the same karyotype as that of the parent line (46 XX), stem cell surface markers (i.e., SSEA3, SSEA4, OCT4, TRA-1-60, and TRA-1-81), and gene expression for pluripotency (Oct-4 and nanog). They all formed embryoid bodies in suspension cultures, and after seedi...Continue Reading
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