Developmental gene expression in skull-base chordomas and chondrosarcomas

Area of Science:

• Oncology
• Developmental Biology
• Genetics

Background:

• Chordomas and chondrosarcomas are malignant tumors of the axial spine and skull base with differing origins.
• Chordomas arise from notochordal remnants, while chondrosarcomas originate from mesenchymal cells.
• Accurate differentiation is critical for treatment and prognosis due to chordomas' poor treatment response.

Purpose of the Study:

• To evaluate the differential expression of developmental transcription factors in skull base chordomas and chondrosarcomas.
• To identify genes associated with notochord, mesoderm, and axial spine development that distinguish between these two tumor types.

Main Methods:

• Histopathologically confirmed biopsies from 12 chordoma and 7 chondrosarcoma patients.
• RNA extraction followed by real-time quantitative PCR (RT-qPCR) analysis.
• Evaluation of 32 evolutionary conserved genes, normalized to ACTB and RS27a housekeeping genes.

Main Results:

• Fifteen genes showed exclusive or overexpression in chordoma compared to chondrosarcoma.
• Brachyury and CD24 were highly and exclusively expressed in chordoma.
• Novel genes exclusive to chordomas included chordin, HOXA5, and ACAN; ten genes were differentially expressed in chondrosarcoma.

Conclusions:

• Differential expression of chordin, HOXA5, ACAN, and CD24 may be relevant to chordoma pathophysiology.
• These genes could hold diagnostic and therapeutic value for chordoma patients.
• Further research into the role of these genes in tumorigenesis is warranted.