POU2F1 (Oct-1) Differently Autoregulates the Alternative Promoters of Its Own Gene by Binding to Different Regulatory Sites View Full Text


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Article Info

DATE

2021-11

AUTHORS

E. V. Pankratova, T. N. Portseva, A. A. Makarova, B. M. Lyanova, S. G. Georgieva, A. G. Stepchenko

ABSTRACT

The POU2F1 gene, which plays an important role in regulating the mammalian genome and development, has both a ubiquitous (U) and a tissue-specific (L) promoter and is subject to intricate regulation. Regions of POU2F1 gene were found to contain multiple binding sites for its product POU2F1 (Oct-1), a transcription factor. Interspecies homology in these regions was found to exceed 90% among the human, mouse, rat, pig, and dog genomes, almost all of the Oct-1 binding sites being identical. Some of the sites cluster in the vicinity of each of the two alternative promoters, while others are in the 5' noncoding region 6 kb upstream of the transcription start site. The presence of Oct-1 at the sites was demonstrated by chromatin immunoprecipitation and the electrophoretic mobility shift assay (EMSA). A POU2F1 knockdown activated the U promoter and downregulated the L promoter in Namalwa cells, while Oct-1 overexpression exerted an opposite effect. Thus, Oct-1 acts via negative feedback to autoregulate the U promoter through low-affinity Oct-1 binding sites and positive feedback to autoregulate the L promoter through high-affinity canonical (oct) sites when increasing in concentration in a natural context. More... »

PAGES

854-862

Identifiers

URI

http://scigraph.springernature.com/pub.10.1134/s0026893321050101

DOI

http://dx.doi.org/10.1134/s0026893321050101

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1143980402


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