Identification of 33 candidate oncogenes by screening for base-specific mutations

Area of Science:

• Genomics
• Cancer Biology
• Molecular Oncology

Background:

• Recurrent somatic mutations in genes are key drivers of tumorigenesis.
• Hypermutable cancers offer a unique system for identifying oncogenic mutations.
• Microsatellite-instable (MSI) colorectal cancers (CRCs) are a focus for mutation discovery.

Purpose of the Study:

• To identify novel mutation hotspots in sporadic MSI colorectal cancers.
• To discover potential oncogenic mutations for therapeutic targeting.

Main Methods:

• Exome sequencing of 25 sporadic MSI colorectal cancers.
• Systematic search for base-specific somatic mutation hotspots.
• Validation of identified hotspots in a larger cohort (254 MSI CRCs).

Main Results:

• Discovery of novel mutation hotspots in 33 genes.
• Confirmation of mutations in 14 genes (ANTXR1, MORC2, CEP135, CRYBB1, GALNT9, KRT82, PI15, SLC36A1, CNTF, GLDC, MBTPS1, OR9Q2, R3HDM1, TTPAL) in a validation set.
• Hotspot mutations were found in multiple cancer types across a database search.

Conclusions:

• Identification of numerous new recurrent candidate oncogene mutations.
• These mutations warrant further investigation as potential therapeutic targets in cancer treatment.