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Erratum: Could magnetic fields affect the circadian clock function of cryptochromes? Testing the basic premise of the cryptochrome hypothesis (ELF magnetic fields) (Health Physics (2015) 109 (84-89))

There is one error and a shortcoming in our paper titled “Could magnetic fields affect the circadian clock function of cryptochromes? Testing the basic premise of the cryptochrome hypothesis (ELF magnetic fields),” (Vanderstraeten et al. 2015) which appeared in the July 2015 issue of Health Physics. On the one hand, the legend of Fig. 1 mentions that reoxidation of FADH partly occurs via a reaction that involves a (triplet-born) radical pair (RP) with reactive oxygen. As written elsewhere in the article, a molecule other than reactive oxygen could in fact take part in this RP. As that RP is most likely singlet-born (Lee et al. 2014), the “Low Field Effect” would then not hinder but enhance the reaction rate. Yet, whichever the nature of this effect and considering the still unclear role of each RP (cf. Fig.1), the actual relation between the redox balance of cryptochromes and intensity of the static magnetic field (MF) is unpredictable so far. On the other hand, in the Discussion, we didn’t mention one relevant study endpoint and one alternative MF exposure protocol. The study endpoint is the circadian rhythmicity of expression of Clock genes in the retina or the suprachiasmatic nucleus (SCN). In the SCN, gene expression should be studied only after several consecutive light/dark (L/D) cycles of MF exposure. Here, indeed, the relevant endpoint is disruption of endogenous biorhythms (generated by the dorsomedial part of the SCN), which requires lasting alteration of the entrainment to the L/D cycle (Golombek and Rosenstein, 2010). The alternative exposure protocol is MF exposure during only or mainly the light-phase or the dark-phase (again during several consecutive L/D cycles). Indeed, since MF affects both the (light-dependent) reduction and the dark reoxidation of cryptochromes, it is possible that a given MF intensity change has a larger impact on their redox balance in case it only occurs during one of the phases of the L/D cycle.