Genetic and genomic analysis of oxygen consumption in mice

We estimated genetic parameters of oxygen consumption (OC), OC per metabolic body weight (OCMBW), and body weight at three through eight weeks of age in divergently selected mice populations, with an animal model considering maternal genetic, common litter environmental, and cytoplasmic inheritance effects. Cytoplasmic inheritance was considered based on maternal lineage information. For OC, estimated direct heritability was moderate (0.32) and estimated maternal heritability and proportion of the variance of cytoplasmic inheritance effects to the phenotypic variance were very low (both <0.03), implying that causal genes for OC could be located on autosomes. To assess this hypothesis, we attempted to identify possible candidate causal genes by performing pool-seq using pooled DNA samples from mice in high and low OC lines and selective signature detection. We made a list of possible candidate causal genes for OC, including those relating to electron transport chain and ATP-binging proteins ( Ndufa12, Sdhc, Atp10b , etc.), Prr16 encoding Largen protein, Cry1 encoding a key component of the circadian core oscillator, and so on. The results could contribute to elucidate the genetic mechanism of OC, an indicator for maintenance energy requirement and therefore feed efficiency.