A multinational team of researchers led by stem cell scientists at the University of California, San Diego School of Medicine and Scripps Research Institute has documented specific genetic abnormalities that occur in human embryonic (hESC) and induced pluripotent stem cell (iPSC) lines. Their study, "Dynamic changes in the copy number of pluripotency and cell proliferation genes in human ESCs and iPSCs during reprogramming and time in culture" will be published in the January 7 issue of the journal
Cell Stem Cell.
The published findings highlight the need for frequent genomic monitoring of pluripotent stem cells to assure their stability and clinical safety.
"We found that human pluripotent cells (hESCs and iPSCs) had higher frequencies of genomic aberrations than other cell types," said Louise Laurent, MD, PhD, assistant professor in the UCSD Department of Reproductive Medicine and first author on the study. "Most strikingly, we observed a higher frequency of genomic duplications in hESCs and deletions in iPSCs, when compared to non-pluripotent samples."
The ability of human pluripotent stem cells to become every cell type in the body has made them potential sources of differentiated cells for cell replacement therapies. "Since genetic aberrations are often associated with cancers, it is vital that cell lines destined for clinical use are free from cancer-associated genomic alterations," said senior author Jeanne F. Loring, PhD, professor and Director of the Center for Regenerative Medicine at the Scripps Research Institute.