Proteogenomic characterization of MiT family translocation renal cell carcinoma

Area of Science:

• Oncology
• Genomics
• Proteomics

Background:

• Microphthalmia transcription factor (MiT) family translocation renal cell carcinoma (tRCC) is a rare kidney cancer subtype lacking comprehensive molecular characterization.
• Understanding the molecular underpinnings of tRCC is crucial for improving diagnosis and treatment strategies.

Purpose of the Study:

• To perform a comprehensive proteogenomic analysis of tRCC tumors and adjacent normal tissues.
• To elucidate the molecular landscape, identify key molecular drivers, and explore potential therapeutic targets in tRCC.

Main Methods:

• Proteogenomic analysis integrating multi-omic data (genomics, transcriptomics, proteomics, phosphoproteomics).
• Analysis of DNA repair, metabolic processes, mTOR signaling pathway, molecular subtyping, and immune infiltration.
• Multi-omic integration to link genomic alterations with cellular process dysregulation.

Main Results:

• Defective DNA repair is implicated in tRCC carcinogenesis and progression.
• Significant dysregulation of metabolic processes at both mRNA and protein levels.
• The mTOR signaling pathway is identified as a potential therapeutic target.
• Molecular subtyping and immune infiltration analysis reveal significant inter-tumoral heterogeneity.
• Genomic alterations are linked to dysregulated cellular processes including oxidative phosphorylation, autophagy, transcription factor activity, and proteasome function.

Conclusions:

• This comprehensive proteogenomic analysis provides novel insights into the molecular mechanisms of tRCC.
• Findings highlight defective DNA repair and metabolic dysregulation as key features of tRCC.
• The study identifies the mTOR pathway as a promising therapeutic target and characterizes tRCC heterogeneity, aiding in disease diagnosis and prognostication.