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Published on: February 9, 2024
Functional consequences of PRPF39 on distant genes and cisplatin sensitivity
Amy L Stark1, Shannon M Delaney, Heather E Wheeler
1Department of Human Genetics, University of Chicago, Chicago, IL 60637, USA.
Human Molecular Genetics
|July 10, 2012
Summary
A single gene variant (SNP) influences cisplatin drug response by altering PRPF39 expression, impacting cellular sensitivity and downstream gene targets. This finding is crucial for understanding cancer pharmacogenomics.
Area of Science:
- Genetics and Genomics
- Pharmacogenomics
- Cancer Biology
Background:
- Gene expression variation is key to disease susceptibility and drug response.
- Genome-wide association studies (GWAS) identify expression quantitative trait loci (eQTLs), but functional analysis is challenging.
- Cisplatin is a widely used chemotherapeutic agent, and understanding its response mechanisms is critical.
Purpose of the Study:
- To investigate the functional consequences of a specific gene variant (SNP) with potential local and distant regulatory roles.
- To determine the impact of this variant on cellular sensitivity to cisplatin.
- To elucidate the downstream effects of modulating the host gene's expression.
Main Methods:
- Measured cellular cisplatin susceptibility in 176 HapMap lymphoblastoid cell lines.
- Identified cytotoxicity-associated single nucleotide polymorphisms (SNPs) and eQTLs.
- Performed PRPF39 gene knockdown using siRNA and analyzed downstream gene expression changes.
Main Results:
- One intronic SNP (rs17115814) significantly correlated with the expression of its host gene, PRPF39, and over 100 distant transcripts.
- PRPF39 knockdown significantly increased cisplatin resistance.
- Knockdown of PRPF39 altered the expression of 53 downstream genes, including key signaling genes MAP3K4 and TFPD2.
Conclusions:
- A local gene variant can have both local and distant regulatory effects impacting drug response.
- Modulation of the PRPF39 gene, identified via GWAS, leads to altered cisplatin sensitivity through downstream gene expression changes.
- This study provides functional insight into eQTLs and their role in pharmacogenomics, particularly for cisplatin treatment.
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