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- W3199978501 abstract "Regulation of the IL-5 receptor alpha (IL5RA) gene is complicated, with two known promoters (P1 and P2) driving transcription, and two known isoforms (transmembrane and soluble) dichotomously affecting the signaling potential of the protein products. Here, we sought to determine the patterns of P1 and P2 promoter usage and transcription factor occupancy during primary human eosinophil development from CD34+ hematopoietic stem cell progenitors. We found that during eosinophilopoiesis, both promoters were active but subject to distinct temporal regulation, coincident with combinatorial interactions of transcription factors, including GATA-1, PU.1, and C/EBP family members. P1 displayed a relatively constant level of activity throughout eosinophil development, while P2 activity peaked early and waned thereafter. The soluble IL-5Rα mRNA peaked early and showed the greatest magnitude fold-induction, while the signaling-competent transmembrane isoform peaked moderately. Two human eosinophilic cell lines whose relative use of P1 and P2 were similar to eosinophils differentiated in culture were used to functionally test putative transcription factor binding sites. Transcription factor occupancy was then validated in primary cultures by ChIP. We conclude that IL-5-dependent generation of eosinophils from CD34+ precursors involves complex and dynamic activity including both promoters, several interacting transcription factors, and both signaling and antagonistic protein products." @default.
- W3199978501 created "2021-09-27" @default.
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- W3199978501 date "2021-09-23" @default.
- W3199978501 modified "2023-09-26" @default.
- W3199978501 title "Transcriptional Regulation of the Human IL5RA Gene through Alternative Promoter Usage during Eosinophil Development" @default.
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- W3199978501 doi "https://doi.org/10.3390/ijms221910245" @default.
- W3199978501 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/8549700" @default.
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