Abstract
Previous studies of the porcine GH-IGF axis have demonstrated age related changes in liver, but not LD muscle, in expression of both GH-receptor (GHR) and IGF-I genes (Brameld et al, 1993; 1995), and also effects of energy availability on the expression of IGF-I in liver, but not in LD muscle (Weller et al, 1994). The work described here was carried out to study the expression of IGF-I and GHR mRNA in liver and skeletal muscle from different breeds of pig. The probes used were as described previously (Brameld et al, 1993; 1995; Weller et al, 1993; 1994), and were designed to monitor promoter usage for IGF-I expression, with the two promoters giving rise to class 1 and 2 transcripts, and also expression of the extra-cellular domain of the GH-receptor.
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