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Trait-associated expressed hepatic and intestine genes in cattle of different metabolic type--putative functional candidates for nutrient utilization.

The present study aimed at identifying bovine hepatic and intestinal DNA sequences expressed breed specifically as potential functional candidate genes for nutrient transformation. Transcript levels of 29 expressed sequence tags (ESTs) were analysed comparatively in the liver and intestine of growing Charolais and German Holstein bulls by real-time RT-PCR. In previous studies, these ESTs were characterized as differentially displayed in mRNA differential display of cows varying in metabolic type and harbouring single nucleotide polymorphisms. Breed-specific gene expression levels indicate significantly increased hepatic metabolic activity in Charolais and increased intestinal metabolic activity in German Holstein bulls. Transcript levels of six functional genes measured in liver (NDUFB8, NACA, UAP1, SAH) and intestine (FUS/TLS, APOC3), respectively, support this assumption. The observed coincidence of metabolic type-specific expressed ESTs with variant ESTs showing breed-specific allele distribution points to functional genetic variants located in the vicinity of the analysed sequences. In addition, location of most of the breed specifically expressed ESTs within chromosome regions known to be affecting carcass and growth traits in cattle supports the putative candidate gene character of the ESTs identified.