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- W2410611566 abstract "E-proteins are basic helix-loop-helix (bHLH) transcription factors with essential roles in animal development. In mammals, these are encoded by three loci: E2-2 (ITF-2/ME2/SEF2/TCF4), E2A (TCF3), and HEB (ME1/REB/TCF12). The HEB and E2-2 paralogs are expressed as alternative (Alt) isoforms with distinct N-terminal sequences encoded by unique exons under separate regulatory control. Expression of these alternative transcripts is restricted relative to the longer (Can) forms, suggesting distinct regulatory roles, although the functions of the Alt proteins remain poorly understood. Here, we characterize the single sea urchin E-protein ortholog (SpE-protein). The organization of the SpE-protein gene closely resembles that of the extended HEB/E2-2 vertebrate loci, including a transcript that initiates at a homologous alternative transcription start site (SpE-Alt). The existence of an Alt form in the sea urchin indicates that this feature predates the emergence of the vertebrates. We present additional evidence indicating that this transcript was present in the common bilaterian ancestor. In contrast to the widely expressed canonical form (SpE-Can), SpE-Alt expression is tightly restricted. SpE-Alt is expressed in two phases: first in aboral non-skeletogenic mesenchyme (NSM) cells and then in oral NSM cells preceding their differentiation and ingression into the blastocoel. Derivatives of these cells mediate immune response in the larval stage. Inhibition of SpE-Alt activity interferes with these events. Notably, although the two isoforms are initially co-expressed, as these cells differentiate, SpE-Can is excluded from the SpE-Alt+ cell population. This mutually exclusive expression is dependent on SpE-Alt function, which reveals a previously undescribed negative regulatory linkage between the two E-protein forms. Collectively, these findings reorient our understanding of the evolution of this transcription factor family and highlight fundamental properties of E-protein biology." @default.
- W2410611566 created "2016-06-24" @default.
- W2410611566 creator A5004190008 @default.
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- W2410611566 date "2016-08-01" @default.
- W2410611566 modified "2023-09-30" @default.
- W2410611566 title "A conserved alternative form of the purple sea urchin HEB/E2-2/E2A transcription factor mediates a switch in E-protein regulatory state in differentiating immune cells" @default.
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- W2410611566 doi "https://doi.org/10.1016/j.ydbio.2016.05.034" @default.
- W2410611566 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/27265865" @default.
- W2410611566 hasPublicationYear "2016" @default.
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