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Proc Natl Acad Sci U S A. 2017 Feb 21;114(8):1964-1969. doi: 10.1073/pnas.1616035114. Epub 2017 Feb 6.

iPSCs and fibroblast subclones from the same fibroblast population contain comparable levels of sequence variations.

Author information

1
Oncogenesis and Development Section, National Human Genome Research Institute, NIH, Bethesda, MD 20892.
2
Comparative Genomics Unit, NIH Intramural Sequencing Center, National Human Genome Research Institute, NIH, Bethesda, MD 20892.
3
Genomics Core, National Human Genome Research Institute, NIH, Bethesda, MD 20892.
4
Hematology Branch, National Heart Lung and Blood Institute, NIH, Bethesda, MD 20892.
5
Cancer Genetics and Comparative Genomics Branch, National Human Genome Research Institute, NIH, Bethesda, MD 20892.
6
Oncogenesis and Development Section, National Human Genome Research Institute, NIH, Bethesda, MD 20892; pliu@mail.nih.gov.

Abstract

Genome integrity of induced pluripotent stem cells (iPSCs) has been extensively studied in recent years, but it is still unclear whether iPSCs contain more genomic variations than cultured somatic cells. One important question is the origin of genomic variations detected in iPSCs-whether iPSC reprogramming induces such variations. Here, we undertook a unique approach by deriving fibroblast subclones and clonal iPSC lines from the same fibroblast population and applied next-generation sequencing to compare genomic variations in these lines. Targeted deep sequencing of parental fibroblasts revealed that most variants detected in clonal iPSCs and fibroblast subclones were rare variants inherited from the parental fibroblasts. Only a small number of variants remained undetectable in the parental fibroblasts, which were thus likely to be de novo. Importantly, the clonal iPSCs and fibroblast subclones contained comparable numbers of de novo variants. Collectively, our data suggest that iPSC reprogramming is not mutagenic.

KEYWORDS:

exome sequencing; fibroblasts; genomic variation; iPSCs; reprogramming

PMID:
28167771
PMCID:
PMC5338363
DOI:
10.1073/pnas.1616035114
[Indexed for MEDLINE]
Free PMC Article

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