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Identification of TIAM1 as a Potential Synthetic-Lethal-like Gene in a Defined Subset of Hepatocellular Carcinoma
Chalermsin Permtermsin1, H Lalchungnunga1, Sirintra Nakjang2
1Biosciences Institute, Newcastle University Centre for Cancer, Newcastle University, Newcastle NE2 4HH, UK.
Abstract:
Hepatocellular carcinoma (HCC), the most common type of liver cancer, has very poor outcomes. Current therapies often have low efficacy and significant toxicities. Thus, there is a critical need for the development of novel therapeutic approaches for HCC. We have developed a novel bioinformatics pipeline, which integrates genome-wide DNA methylation and gene expression data, to identify genes required for the survival of specific molecular cancer subgroups but not normal cells. Targeting these genes may induce cancer-specific "synthetic lethality". Initially, five potential HCC molecular subgroups were identified based on global DNA methylation patterns. Subgroup-2 exhibited the most unique methylation profile and two candidate subtype-specific vulnerability or SL-like genes were identified for this subgroup, including TIAM1, a guanine nucleotide exchange factor encoding gene known to activate Rac1 signalling. siRNA targeting TIAM1 inhibited cell proliferation in TIAM1-positive (subgroup-2) HCC cell lines but had no effect on the normal hepatocyte HHL5 cell line. Furthermore, TIAM1-positive/subgroup-2 cell lines were significantly more sensitive to the TIAM1/RAC1 inhibitor NSC23766 compared with TIAM1-negative HCC lines or the normal HHL5 cell line. The results are consistent with a synthetic lethal role for TIAM1 in a methylation-defined HCC subgroup and suggest it may be a viable therapeutic target in this subset of HCC patients.
Insights
Novel bioinformatics identified TIAM1 as a synthetic lethal target in a specific hepatocellular carcinoma (HCC) subgroup. Targeting TIAM1 offers a potential new therapy for this liver cancer subtype.
Area of Science:
- Oncology
- Bioinformatics
- Molecular Biology
Background:
- Hepatocellular carcinoma (HCC) has poor outcomes and limited effective therapies.
- Novel therapeutic strategies are urgently needed for liver cancer.
- Identifying cancer-specific vulnerabilities is key to developing targeted treatments.
Purpose of the Study:
- To develop a bioinformatics pipeline to identify novel therapeutic targets in HCC.
- To discover genes essential for specific HCC molecular subgroups but not normal cells, enabling synthetic lethality.
- To validate TIAM1 as a potential therapeutic target in a defined HCC subgroup.
Main Methods:
- Integrated genome-wide DNA methylation and gene expression data using a novel bioinformatics pipeline.
- Identified five HCC molecular subgroups based on DNA methylation patterns.
- Utilized siRNA and a TIAM1/RAC1 inhibitor (NSC23766) to assess TIAM1's role in HCC cell lines and normal hepatocytes.
Main Results:
- A unique methylation profile was identified in HCC subgroup-2.
- TIAM1 was identified as a candidate vulnerability gene for subgroup-2.
- siRNA targeting TIAM1 inhibited proliferation in TIAM1-positive HCC cells but not normal cells.
- TIAM1-positive HCC cells showed increased sensitivity to the TIAM1/RAC1 inhibitor NSC23766.
Conclusions:
- TIAM1 exhibits a synthetic lethal role in a methylation-defined HCC subgroup.
- TIAM1 represents a promising, cancer-specific therapeutic target for a subset of HCC patients.
- This approach highlights the potential of bioinformatics in discovering targeted cancer therapies.
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