Mining Transcriptomic Data to Uncover the Association between CBX Family Members and Cancer Stemness

Area of Science:

• Epigenetics
• Cancer Biology
• Molecular Oncology

Background:

• Genetic and epigenetic alterations drive tumor progression and stem cell-like phenotypes.
• Chromobox (CBX) proteins are epigenetic factors involved in histone modification, but their role in cancer stemness is largely unknown.

Purpose of the Study:

• To investigate the association between CBX family member expression and cancer stemness in liver, lung, pancreatic, and uterine tumors.
• To elucidate the relationship between CBX expression, tumor grade, and mutation load.

Main Methods:

• Utilized TCGA and GEO databases for gene expression analysis.
• Employed bioinformatic tools including Oncomine, GEPIA2, TISIDB, GSCA, UALCAN, R2, Enrichr, and GSEA.
• Correlated CBX expression with stemness markers, tumor grade, and mutation data.

Main Results:

• Upregulation of CBX3 and downregulation of CBX7 were consistently linked to enhanced cancer stemness across tumor types.
• High CBX3 expression correlated with higher tumor grade, stemness markers, c-Myc targets, and increased mutation load.
• Low CBX7 expression was associated with higher tumor grade and stemness, but paradoxically with a lower mutation burden.

Conclusions:

• CBX3 and CBX7 expression levels are significant epigenetic regulators of cancer stemness in solid tumors.
• The distinct roles of CBX3 and CBX7 in regulating stemness and mutation burden warrant further investigation.
• These findings highlight potential therapeutic targets for modulating cancer stem cell phenotypes.