[No authors listed]
mRNA differential display was applied to identify hepatic and intestinal expressed sequence tags (ESTs) in lactating cows of different metabolic types (milk type, meat/milk type, meat type) that are potentially associated with energy turnover and involved in the regulation of these processes. Altogether, 277 ESTs (liver: 161, intestine: 116) were identified. For 150 transcripts (liver: 99, intestine: 51), the sequences showed similarity to previously described genes and ESTs. Many of these homologous sequences are reported to be involved in hepatic metabolism. Ninety-four ESTs (liver: 43, intestine: 51) did not match with any database entries. Semi-quantitative RT-PCR revealed quantitative differences in transcript represented by randomly chosen ESTs in liver samples of animals of the Holstein and Charolais breeds. One hundred twenty-two ESTs were mapped physically by using a bovine-hamster somatic cell hybrid panel (SCP) and a 5000-rad bovine whole genome radiation hybrid panel (WGRH). These ESTs were assigned to the bovine syntenic groups and positioned in the recently established RH-based ordered comparative map of the cattle and human genomes. The mapped, differentially expressed sequence tags are a useful prerequisite for cloning of genetic variation underlying economic traits.
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