{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\n The cAMP‐response element modulator (CREM) is a highly versatile transcription factor belonging to the CREB family that plays key, context‐dependent roles through the expression of distinct isoforms—some acting as transcriptional activators and others as repressors. In the nervous system, CREM contributes to neuronal survival and differentiation. In mice, loss of CREB together with CREM leads to widespread apoptosis of postmitotic neurons and impaired neurogenesis, reflecting its essential role in coupling neuronal activity to gene expression programs that promote cell survival and plasticity."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": ""}]}, {"type": "t", "text": "\n \n "}, {"type": "p", "children": [{"type": "t", "text": "\n In the testis, CREM is a pivotal regulator of spermatogenesis. During germ cell development, alternative splicing generates repressive and activating isoforms whose timely switching is critical for the transcriptional activation of haploid genes necessary for spermiogenesis. For instance, CREM‐activator forms (e.g., CREMτ and CREMθ) drive the onset of postmeiotic gene expression, while repressor isoforms (such as ICER, an inducible CREM variant) also participate in fine‐tuning transcriptional cycles in both Sertoli and germ cells."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "3", "end_ref": "5"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n \n "}, {"type": "p", "children": [{"type": "t", "text": "\n In immune cells, particularly T lymphocytes, CREM—most notably the α isoform—plays a dual role. Increased CREMα activity in T cells from systemic lupus erythematosus patients has been linked to aberrant cytokine gene regulation, where it suppresses IL-2 expression and simultaneously promotes IL-17A transcription by binding to specific CRE sites within their promoters. These epigenetic modifications contribute to an imbalance in regulatory versus effector T cell responses and have been implicated in autoimmune pathology."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "6", "end_ref": "8"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n \n "}, {"type": "p", "children": [{"type": "t", "text": "\n CREM’s activity is further modulated via upstream signal transduction pathways. In spermatogonial stem cells, for example, growth factor signaling via the Ras/ERK1/2 pathway leads to the phosphorylation of CREM (along with other CREB family members), thereby promoting cell proliferation and the transcription of genes such as c-fos."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "9"}]}, {"type": "t", "text": " In metabolic tissues, CREM, expressed alongside other CREB family proteins, contributes to the transcriptional regulation of genes such as those involved in steroidogenesis (e.g., StAR) in cooperation with nuclear receptors and other transcription factors."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "11"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n \n "}, {"type": "p", "children": [{"type": "t", "text": "\n In the cardiovascular system, altered expression of specific CREM isoforms, such as the cardiac variant CREM-IbΔC-X, leads to remodeling changes including hypertrophy and arrhythmogenic phenotypes, underscoring its importance in cardiac gene regulation and function."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "13"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n \n "}, {"type": "p", "children": [{"type": "t", "text": "\n Finally, chromosomal rearrangements involving CREM—such as fusions with the EWSR1 gene—have been identified in rare mesenchymal tumors, suggesting that aberrant CREM activity may also contribute to oncogenic processes."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "14"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n \n "}, {"type": "p", "children": [{"type": "t", "text": "\n In summary, CREM functions as a central regulatory node whose activity is fine-tuned by alternative splicing, post-translational modifications, and upstream signaling cascades. Its ability to act as either an activator or repressor enables CREM to coordinate diverse biological processes—including neuronal development, spermatogenesis, immune regulation, metabolic gene expression, and even oncogenesis—in a tissue-specific and context-dependent manner."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "16", "end_ref": "18"}]}, {"type": "t", "text": "\n "}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Theo Mantamadiotis, Thomas Lemberger, Susanne C Bleckmann, et al. 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