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Transgenic coho salmon (Oncorhynchus kisutch) containing a growth hormone gene construct were comparedwith nontransgenic coho salmon in terms of gross anatomy, muscle cellularity, muscle enzyme activity, and differentialgene expression. Transgenic fish were found to have significantly higher numbers of small-diameter muscle fibres inboth the dorsal and lateral region of the somitic muscle, suggesting that they grow by greater rates of hyperplasia relativeto slower growing nontransgenic fish. Higher levels of activity were found for phosphofructokinase and cytochromeoxidase in white muscle of the transgenic fish. This difference indicates a higher glycolytic and aerobic requirement inthe muscle of transgenic fish. Subtractive hybridisation of muscle RNA of transgenic fish from control fish provided alibrary of cDNAs whose expression is upregulated in the transgenic fish. This library contains genes that may be involvedin, or related to, both high growth rates and muscle hyperplasia. We have sequenced a number of fragments andhave found a preponderance of myosin light chain 2 mRNAs, consistent with a putative high level of expression in theearly stages of muscle fibre construction

canadian journal of fisheries and aquatic sciences

Coho salmon (<i>Oncorhynchus kisutch</i>) transgenic for a growth hormone gene construct exhibit increased rates of muscle hyperplasia and detectable levels of differential gene expression

Coho salmon (Oncorhynchus kisutch) transgenic for a growth hormone gene construct exhibit increased rates of muscle hyperplasia and detectable levels of differential gene expression