Decoding complex patterns of genomic rearrangement in hepatocellular carcinoma

Area of Science:

• Genomics
• Oncology
• Molecular Biology

Background:

• Hepatocellular carcinoma (HCC) molecular basis is not fully understood.
• Genomic rearrangements (GRs) in HCC, leading to oncogenic gene fusions, are poorly characterized.

Purpose of the Study:

• To elucidate the landscape of somatic genomic rearrangements in HCC.
• To identify novel gene fusions and their role in HCC pathogenesis.

Main Methods:

• Whole-genome sequencing of 88 primary HCC tumor/non-tumor tissues.
• Prediction and analysis of large-scale genomic rearrangements (insertions, deletions, inversions, translocations).
• Integrative analysis of genomic data, including copy number variation and gene fusions.

Main Results:

• Predicted 4314 GRs, including chromothripsis in 5.7% of HCC genomes affecting 1q and 8q.
• Identified GRs, mutations, and deletions in the Albumin (ALB) gene in 10% of cases.
• Predicted 260 gene fusions, with 18 validated, including recurrent ABCB11-LRP2 fusion.

Conclusions:

• Genomic rearrangements are prevalent in HCC and contribute to oncogenesis.
• Chromothripsis and specific gene fusions represent potential therapeutic targets in HCC.
• Further research into HCC genomic alterations can inform targeted treatment strategies.