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Systems-Level Mapping of Cancer Testis Antigen 1b/a to Sarcoma Pathways Identifies Activated Ran Binding-2 E3

Nikolaos A Papanikolaou1, Prodromos Hytiroglou2, Pavlina Pantelidou2

  • 1Laboratory of Biological Chemistry, Department of Medicine, Section of Biological Sciences and Preventive Medicine, School of Medicine, Aristotle University of Thessaloniki, Macedonia, Greece.

Frontiers in Genetics
|June 6, 2022
PubMed

Insights

Researchers identified sarcoma cancer testis gene 1b/a (CTAG1B/A) network in advanced tumors. This network mapping approach helps identify potential oncoproteins for cancer therapy.

Area of Science:

  • Oncology
  • Molecular Biology
  • Bioinformatics

Background:

  • Cancer testis genes are typically expressed in germ cells but can be re-activated in various cancers.
  • The sarcoma cancer testis gene 1b/a (CTAG1B/A) is an ortholog of a yeast/Drosophila transcription factor involved in telomere maintenance and transcriptional regulation.
  • CTAG1B/A is known to be expressed in adult testis germ cell differentiation and implicated in chromatin remodeling.

Purpose of the Study:

  • To identify genes and proteins expressed in advanced grade tumors by reconstructing a CTAG1B/A network.
  • To investigate the re-activation of CTAG1B/A in different types of sarcomas.
  • To validate the network reconstruction approach for identifying candidate oncoproteins.

Main Methods:

  • Reconstruction of a sarcoma CTAG1B/A gene network.
  • Gene Set Enrichment Analysis (GSEA) to map CTAG1B/A protein to sarcoma transcription pathways.
  • Immunohistochemical analysis of network neighbors (RANBP2, TLE1) in independent sarcoma samples.

Main Results:

  • CTAG1B/A is re-activated in synovial sarcomas and myxoid liposarcomas, but not in differentiated liposarcomas.
  • Network reconstruction successfully mapped CTAG1B/A to sarcoma transcription pathways.
  • Expression of network neighbors RANBP2 and TLE1 was confirmed immunohistochemically, validating the network approach.

Conclusions:

  • Network reconstruction is a powerful tool for identifying candidate oncoproteins by mapping unknown genes to functional pathways.
  • The study identifies CTAG1B/A and its network neighbors as potentially important in advanced sarcomas.
  • This approach can accelerate the discovery of novel therapeutic targets in cancer.
Keywords:
CtaGGSEARanBP2TLE1networksarcomatranscription

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