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Spatial and Temporal Control of Murine Melanoma Initiation from Mutant Melanocyte Stem Cells
Published on: June 7, 2019
A Transcriptionally Inactive ATF2 Variant Drives Melanomagenesis
Giuseppina Claps1, Yann Cheli1, Tongwu Zhang2
1Tumor Initiation and Maintenance Program, Cancer Center, Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA 92037, USA.
Abstract:
Melanoma is one of the most lethal cutaneous malignancies, characterized by chemoresistance and a striking propensity to metastasize. The transcription factor ATF2 elicits oncogenic activities in melanoma, and its inhibition attenuates melanoma development. Here, we show that expression of a transcriptionally inactive form of Atf2 (Atf2(Δ8,9)) promotes development of melanoma in mouse models. Atf2(Δ8,9)-driven tumors show enhanced pigmentation, immune infiltration, and metastatic propensity. Similar to mouse Atf2(Δ8,9), we have identified a transcriptionally inactive human ATF2 splice variant 5 (ATF2(SV5)) that enhances the growth and migration capacity of cultured melanoma cells and immortalized melanocytes. ATF2(SV5) expression is elevated in human melanoma specimens and is associated with poor prognosis. These findings point to an oncogenic function for ATF2 in melanoma development that appears to be independent of its transcriptional activity.
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