Deciphering the 8q24.21 association for glioma
Victor Enciso-Mora1, Fay J Hosking, Ben Kinnersley
1Division of Genetics and Epidemiology, Institute of Cancer Research, 15 Cotswold Road, Sutton, Surrey SM2 5NG, UK.
Human Molecular Genetics
|February 13, 2013
Summary
A specific genetic variant, rs55705857, strongly influences glioma risk, particularly in non-glioblastoma tumors. This finding pinpoints a key genetic factor in glioma development.
Area of Science:
- Genetics
- Oncology
- Molecular Biology
Background:
- Previous studies identified tag single nucleotide polymorphisms (tagSNPs) at 8q24.21 associated with glioma risk.
- The precise functional variant and its role in glioma etiology remained unclear.
Purpose of the Study:
- To fine-map the 8q24.21 locus and identify the specific genetic variant responsible for glioma risk.
- To investigate the association of this variant with different glioma subtypes.
Main Methods:
- Utilized data from four genome-wide association studies (GWAS) including 4147 glioma cases and 7435 controls.
- Imputed genotypes using 1000 Genomes Project data and high-coverage sequencing for enhanced marker density.
- Performed association analyses stratified by glioma subtype and validated findings in independent datasets.
Main Results:
- Identified a low-frequency single nucleotide polymorphism, rs55705857, that fully captured the 8q24.21 glioma association (P = 2.24 × 10⁻³⁸).
- The association of rs55705857 was predominantly observed in non-glioblastoma (non-GBM) tumors (P = 1.07 × 10⁻⁶⁷).
- rs55705857 showed a significant odds ratio of 4.3 for low-grade glioma (P = 2.31 × 10⁻⁹⁴) and maps to a conserved region within the CCDC26 long non-coding RNA.
Conclusions:
- rs55705857 is the primary causal variant at 8q24.21 influencing glioma risk, particularly for non-GBM subtypes.
- The variant's location within a conserved non-coding RNA suggests a potential functional role in glioma development.
- These findings enhance understanding of the genetic underpinnings of glioma etiology.
