BCL7B, a SWI/SNF complex subunit, orchestrates cancer immunity and stemness

Area of Science:

• Oncology
• Molecular Biology
• Immunology

Background:

• Cancer remains a leading cause of mortality worldwide.
• The B-cell lymphoma 7 protein family member B (BCL7B) is an accessory subunit of the SWI/SNF chromatin-remodeling complex.
• Understanding BCL7B's role is crucial for cancer research.

Purpose of the Study:

• To investigate the functional role of the BCL7B gene in stomach cancer.
• To characterize the impact of BCL7B deficiency on gene expression and epigenetic modifications.
• To explore the relationship between BCL7B, cancer stemness, and immune evasion.

Main Methods:

• CRISPR/Cas9 genome editing was used to generate BCL7B-deficient stomach cancer cell lines.
• RNA-sequencing (RNA-seq) analyzed comprehensive gene expression patterns.
• Chromatin immunoprecipitation sequencing (ChIP-seq) with H3K27me3 antibody assessed epigenetic modifications.
• Machine learning identified key sequence changes affecting antigen presentation.

Main Results:

• BCL7B deficiency led to significant downregulation of immune-related genes.
• Stemness-related genes were markedly upregulated in BCL7B-deficient cells.
• Epigenetic modifications and antigen presentation were altered, impacting immune evasion.

Conclusions:

• BCL7B expression regulates cancer stem cell-like characteristics.
• Loss of BCL7B contributes to an immune-evasive phenotype in cancer cells.
• BCL7B is a potential target for modulating cancer stemness and immune response.