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Abstract
1. The association of single nucleotide polymorphisms identified within the ADSL (adenylosuccinate lyase deficiency) gene and GARS-AIRS-GART (glycinamide ribonucleotide synthetase-aminoimidazole ribonucleotide synthetase-glycinamide ribonucleotide transformylase) gene with the content of inosine 5′-monophosphate (IMP) was studied in a population of male Beijing-you (BJY) chickens slaughtered at 90 d of age.
2. A single nucleotide polymorphism in exon 2 of the ADSL gene had an effect on IMP content. Chickens inheriting the positive allele at ADSL, both homozygous and heterozygous genotypes, had a higher content of IMP in breast muscle than did individuals without it.
3. Similar results were obtained for the GARS-AIRS-GART gene. The marker at the 5′ untranslated region (UTR) of the GARS-AIRS-GART gene was also significant for the IMP value. Chickens inheriting the genotypes with the positive allele at this locus had a much higher content of IMP than did those homozygous for the unfavourable one.
4. Interactions between ADSL and GARS-AIRS-GART were detected for such traits as body weight and muscle yields in the tested population. The two loci acted in an additive fashion. Because IMP is one of the most important flavour components in meat, markers developed at these two genes, as well as the combination genotypes, could be used as potential molecular markers for improving chicken quality.
Acknowledgements
The authors thank W. Bruce Currie (Cornell University, New York, NY, USA) for language suggestions on the manuscript. This work was supported by The Key Laboratory for Farm Animal Genetic Resources and Utilisation of the Ministry of Agriculture of China (Grant Number 2008AA101009) and the National High-tech R&D Program (Grant Number 2006AA10Z1D8).