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• W4221016903 abstract "Abstract Pleiotropic functions of miRNAs as transcriptional repressors have been reported for multiple biological processes. One prominent miRNA family is the miR-15 family, which is a well-established tumor-suppressor in B-cell chronic lymphocytic leukemia (CLL). The miR-15 family consists of three bicistronic clusters, miR-15a/16-1, miR-15b/16-2 and miR-497/195, all sharing the same seed sequence suggesting that loss one cluster can be functionally compensated by the remaining miR-15 family members. Thus, a combined deletion may be necessary to reveal its physiological function in vivo . A combined knockout of the most prominent miR-15 clusters, miR-15a/16-1 and miR-15b/16-2 in the hematopoietic system reveals a novel role of the miR-15 family in early B cell development highlighted by an increase of the pro-B cell compartment. Mechanistically, this effect is mediated by enhanced IL-7 receptor expression, which we identified as direct miR-15 target gene. Notably, elevated IL-7 receptor levels were sufficient to trigger increased activation of the STAT5 and PI3K/AKT pathways. Moreover, derepression of directly targeted cell cycle regulators such as Ccne1, Chek1 and Wee1 further facilitates G-to-S transition. Thus, by deregulating a target gene network of cell cycle and signaling mediators, loss of the miR-15 family establishes a pro-proliferative milieu manifesting in an enlarged pro-B cell pool." @default.
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• W4221016903 date "2022-03-21" @default.
• W4221016903 modified "2023-09-28" @default.
• W4221016903 title "The miR-15a/16-1 and miR-15b/16-2 clusters regulate early B cell development by limiting IL-7 receptor expression" @default.
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• W4221016903 doi "https://doi.org/10.1101/2022.03.18.484871" @default.
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