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Updated: May 22, 2025
Spatial and Temporal Control of Murine Melanoma Initiation from Mutant Melanocyte Stem Cells
Published on: June 7, 2019
Knockout of SIN3B modulates transcriptional programs and cell survival in cutaneous melanoma
Larissa Satiko Alcantara Sekimoto Matsuyama1, Victoria Harle2, Victoria Offord2
1Department of Clinical and Toxicological Analyses, School of Pharmaceutical Sciences, University of Sao Paulo, Sao Paulo, Brazil; Wellcome Sanger Institute, Wellcome Trust Genome Campus, Hinxton, Cambridgeshire, United Kingdom.
Abstract:
SIN3 is a critical component of the histone deacetylase complex. Utilizing whole transcriptome data from melanoma patient samples we reveal that elevated levels of SIN3B are associated with poor survival outcomes with in vitro studies showing increased SIN3B expression in BRAF-mutant metastatic melanoma cell lines. The generation of isogenic SIN3B knockout cell lines indicated that SIN3B disruption led to a decrease in pathways associated with tumor invasion, migration, and cell-cell interactions. Moreover, pooled genome-wide CRISPR/Cas9 screens highlighted POLE4 and STK11 as crucial for the fitness and survival of SIN3B-knockout melanoma cells suggesting a role for these genes in epistasis with SIN3B. In summary, our findings suggest that SIN3B plays a pivotal role in modulating the behavior of melanoma cells, with implications for tumor growth and response to therapy.
Insights
Elevated SIN3B levels correlate with poor melanoma survival. Its disruption reduces tumor invasion and migration, highlighting SIN3B as a key regulator in melanoma progression.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- SIN3 is a core component of histone deacetylase complexes, influencing gene expression.
- Melanoma progression involves complex molecular alterations affecting cell behavior and survival.
Purpose of the Study:
- To investigate the role of SIN3B in melanoma patient survival and cellular behavior.
- To identify potential therapeutic targets related to SIN3B in melanoma.
Main Methods:
- Analysis of whole transcriptome data from melanoma patient samples.
- In vitro studies using melanoma cell lines, including isogenic SIN3B knockout models.
- Genome-wide CRISPR/Cas9 screening.
Main Results:
- Higher SIN3B expression is linked to poorer survival outcomes in melanoma patients.
- SIN3B knockdown decreased melanoma cell invasion, migration, and cell-cell interaction pathways.
- POLE4 and STK11 were identified as critical for SIN3B-knockout melanoma cell survival, suggesting epistasis.
Conclusions:
- SIN3B plays a significant role in melanoma cell behavior, impacting tumor growth and invasion.
- Targeting SIN3B may offer a therapeutic strategy for melanoma.
- Further research into the epistasis between SIN3B, POLE4, and STK11 is warranted.
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