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Marbling (intramuscular fat) is the most economically important meat quality trait in Hanwoo (Korean cattle). The endot-helial differentiation G-protein coupled receptor 1 (EDG1) gene, involved in blood vessel formation, is located within thegenomic region of a quantitative trait locus (QTL) for marbling on bovine chromosome 3. Thus, the EDG1 gene can beconsidered as a positional and functional candidate gene for meat quality in beef cattle. This study aimed to identify singlenucleotide polymorphisms (SNPs) in the EDG1 gene and to evaluate their associations with carcass traits in Hanwoo pop-ulation. We have sequenced a fragment of 5'-UTR of the EDG1 gene and identified one SNP. Genotyping of the g.166A>GSNP marker was carried out using PCR-RFLP analysis in 309 Hanwoo steers in order to evaluate their association withcarcass traits. The g.166A>G SNP marker showed a significant effect on the marbling score. Animals with the GG genotypehad higher marbling score compared with AA and AG genotypes (p<0.05). This SNP marker also showed a significant addi-tive effects for the marbling score (p<0.05). These results suggest that the EDG1 gene can be used as a molecular markerfor DNA marker-assisted selection in order to increase the levels of the marbling score in Hanwoo.Key words: EDG1, marbling score, SNP, meat quality, Hanwoo

Effect of Single Nucleotide Polymorphism of Endothelial Differentiation G-Protein Coupled Receptor 1 (EDG1) Gene on Marbling Score in Hanwoo