JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
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Mature Let-7 miRNAs fine tune expression of LIN28B in pluripotent human embryonic stem cells.

Stem Cell Research 2016 November
MicroRNAs (miRNA) are central regulators of diverse biological processes and are important in the regulation of stem cell self-renewal. One of the widely studied miRNA-protein regulators is the Lin28-Let-7 pair. In this study, we demonstrate that contrary to the well-established models of mouse ES cells (mESC) and transformed human cancer cells, the pluripotent state of human ES cells (hESC) involves expression of mature Let-7 family miRNAs with concurrent expression of all LIN28 proteins. We show that mature Let-7 miRNAs are regulated during hESC differentiation and have opposite expression profile with LIN28B. Moreover, mature Let-7 miRNAs fine tune the expression levels of LIN28B protein in pluripotent hESCs, whereas silencing of LIN28 proteins have no effect on mature Let-7 levels. These results bring novel information to the highly complex network of human pluripotency and suggest that maintenance of hESC pluripotency differs greatly from the mESCs in regard to LIN28-Let-7 regulation.

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