CRISPR/Cas9 as a tool to dissect cancer mutations

Area of Science:

• Biomedical research
• Cancer genomics
• Molecular biology

Background:

• The CRISPR/Cas9 system offers precise gene editing for biomedical applications, including cancer research.
• Differentiating critical cancer-causing mutations from non-essential ones is challenging.
• High-throughput screening is needed to identify functionally relevant mutations.

Purpose of the Study:

• To develop and apply a CRISPR/Cas9-based method for high-throughput screening of cancer mutation relevance.
• To identify novel cancer driver mutations in colorectal carcinoma cell lines.
• To functionally validate identified mutations impacting tumor growth and survival.

Main Methods:

• Designed 100 sequence-specific single-guide RNAs (sgRNAs) for CRISPR/Cas9 targeting of mutations in RKO cells.
• Constructed a pooled lentiviral library of sgRNAs for a large-scale screen.
• Quantified sgRNA abundance via deep sequencing after pooled screening of RKO cells.
• Validated candidate driver mutations through functional assays.

Main Results:

• Depletion of sgRNAs targeting the UTP14A: S99delS mutation was observed over time in RKO cells.
• Functional characterization confirmed that inactivating UTP14A: S99delS impairs RKO cell growth.
• UTP14A: S99delS is identified as a putative driver mutation in this colorectal cancer model.

Conclusions:

• The CRISPR/Cas9 system enables efficient, large-scale functional dissection of cancer mutations.
• This approach can identify novel driver mutations and cancer vulnerabilities.
• The identified UTP14A: S99delS mutation is critical for RKO cell proliferation, offering a potential therapeutic target.