PMCCPMCCPMCC

Search tips
Search criteria 

Advanced

 
Logo of biolettersThe Royal Society PublishingBiology LettersAboutBrowse By SubjectAlertsFree Trial
 
Biol Lett. 2009 June 23; 5(3): 360–363.
Published online 2009 February 25. doi:  10.1098/rsbl.2009.0004
PMCID: PMC2679922

Ockham's razor gone blunt: coenzyme Q adaptation and redox balance in tropical reef fishes

Abstract

The ubiquitous coenzyme Q (CoQ) is a powerful antioxidant defence against cellular oxidative damage. In fishes, differences in the isoprenoid length of CoQ and its associated antioxidant efficacy have been proposed as an adaptation to different thermal environments. Here, we examine this broad contention by a comparison of the CoQ composition and its redox status in a range of coral reef fishes. Contrary to expectations, most species possessed CoQ8 and their hepatic redox balance was mostly found in the reduced form. These elevated concentrations of the ubiquinol antioxidant are indicative of a high level of protection required against oxidative stress. We propose that, in contrast to the current paradigm, CoQ variation in coral reef fishes is not a generalized adaptation to thermal conditions, but reflects species-specific ecological habits and physiological constraints associated with oxygen demand.

Keywords: coenzyme Q, fishes, redox balance, temperature

Articles from Biology Letters are provided here courtesy of The Royal Society