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1 Department of Animal Science, University of Nebraska - Lincoln, Lincoln, NE, USA
* To whom correspondence should be addressed. E-mail: dpomp{at}unl.edu.
Mouse lines divergently selected for heat loss were evaluated for correlated responses in the hypothalamic transcriptome. High (MH) heat loss mice have ~50% greater heat loss, ~35% less body fat, ~20% greater feed intake, ~100% greater locomotor activity levels, and higher core body temperature compared to low (ML) heat loss mice. We evaluated hypothalamic expression between inbred lines derived from MH and ML lines (IH and IL, respectively) using cDNA microarrays and selected genes previously isolated in a large dd-PCR experiment. Northern analysis was used to confirm differences, revealing higher hypothalamic mRNA expression of oxytocin (Oxt) and tissue inhibitor of metalloproteinase 2 (Timp-2) in the IH line. Real-time PCR assays were developed for Oxt, Timp-2, and ribosomal protein L3 (Rpl3, previously found to be up-regulated in IL) and confirmed differential expression of these genes with potential physiological relevance in energy balance. These results provide information on correlated responses in the transcriptome of mice selected for high and low energy expenditure, and reveal new information regarding genetic regulation of energy balance.
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