Abstract
In mammals, the peroxisome proliferator activated receptor (PPAR)γ coactivator-1α (PGC-1α) is a central regulator of mitochondrial gene expression, acting in concert with nuclear respiratory factor-1 (NRF-1) and the PPARs. Its role as a “master regulator” of oxidative capacity is clear in mammals, but its role in other vertebrates is ambiguous. In lower vertebrates, although PGC-1α seems to play a role in coordinating the PPARα axis as in mammals, it does not appear to be involved in NRF-1 regulation of mitochondrial content. To evaluate the evolutionary patterns of this coactivator in fish and mammals, we investigated the evolutionary trajectories of PGC-1α homologs in representative vertebrate lineages. A phylogeny of the PGC-1 paralogs suggested that the family diversified through repeated genome duplication events early in vertebrate evolution. Bayesian and maximum likelihood phylogenetic reconstructions of PGC-1α in representative vertebrate species revealed divergent evolutionary dynamics across the different functional domains of the protein. Specifically, PGC-1α exhibited strong conservation of the activation/PPAR interaction domain across vertebrates, whereas the NRF-1 and MEF2c interaction domains experienced accelerated rates of evolution in actinopterygian (fish lineages) compared to sarcopterygians (tetrapod lineages). Furthermore, analysis of the amino acid sequence of these variable domains revealed successive serine- and glutamine-rich insertions within the teleost lineages, with important ramifications for PGC-1α function in these lineages. Collectively, these results suggest modular evolution of the PGC-1α protein in vertebrates that could allow for lineage-specific divergences in the coactivating capabilities of this regulator.
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This study was funded through a Discovery Grant from the Natural Sciences and Engineering Research Council of Canada (NSERC).
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LeMoine, C.M.R., Lougheed, S.C. & Moyes, C.D. Modular Evolution of PGC-1α in Vertebrates. J Mol Evol 70, 492–505 (2010). https://doi.org/10.1007/s00239-010-9347-x
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DOI: https://doi.org/10.1007/s00239-010-9347-x