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Title: PIWI Proteins Are Dispensable for Mouse Somatic Development and Reprogramming of Fibroblasts into Pluripotent Stem Cells

Journal Article · · PLoS ONE
 [1];  [2];  [2];  [1]
  1. Yale Univ., New Haven, CT (United States). School of Medicine. Dept. of Cell Biology. Yale Stem Cell Center
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Genomics Division

PIWI proteins play essential and conserved roles in germline development, including germline stem cell maintenance and meiosis. Because germline regulators such as OCT4, NANOG, and SOX2 are known to be potent factors that reprogram differentiated somatic cells into induced pluripotent stem cells (iPSCs), we investigated whether the PIWI protein family is involved in iPSC production. We find that all three mouse Piwi genes, Miwi, Mili, and Miwi2, are expressed in embryonic stem cells (ESCs) at higher levels than in fibroblasts, with Mili being the highest. However, mice lacking all three Piwi genes are viable and female fertile, and are only male sterile. Furthermore, embryonic fibroblasts derived from Miwi/Mili/Miwi2 triple knockout embryos can be efficiently reprogrammed into iPS cells. These iPS cells expressed pluripotency markers and were capable of differentiating into all three germ layers in teratoma assays. Genome-wide expression profiling reveals that the triple knockout iPS cells are very similar to littermate control iPS cells. These results indicate that PIWI proteins are dispensable for direct reprogramming of mouse fibroblasts.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER). Biological Systems Science Division
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1627700
Journal Information:
PLoS ONE, Vol. 9, Issue 9; ISSN 1932-6203
Publisher:
Public Library of ScienceCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (6)

Exploring the read-write genome: mobile DNA and mammalian adaptation journal September 2016
Somatic MIWI2 Hinders Direct Lineage Reprogramming From Fibroblast to Hepatocyte: Function of Somatic MIWI2 journal February 2019
Differential expression of piRNAs in reprogrammed pluripotent stem cells from mouse embryonic fibroblasts journal July 2019
Comparative Principles of DNA Methylation Reprogramming during Human and Mouse In Vitro Primordial Germ Cell Specification journal December 2022
Somatic expression of piRNA and associated machinery in the mouse identifies short, tissue-specific piRNA journal April 2019
Argonaute and Argonaute-Bound Small RNAs in Stem Cells journal February 2016

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