Dissecting and modeling photic and melanopsin effects to predict sleep disturbances induced by irregular light exposure in mice
Jeffrey Hubbard, Mio Kobayashi Frisk, Élisabeth Ruppert, Jessica W. Tsai, Fanny Fuchs, Ludivine Robin-Choteau, Jana Husse, Laurent Calvel, Gregor Eichele, Paul Franken, Patrice Bourgin
Abstract
), we uncovered, contrary to prevailing assumptions, that the contribution of SDLE is as important as circadian-driven input in determining SWc amplitude. Specifically, SDLE were primarily mediated (>80%) through melanopsin, of which half were then relayed through the SCN, revealing an ancillary purpose for this structure, independent of its clock function in organizing SWc. Based on these findings, we designed a model to estimate the effect of atypical light-dark cycles on SWc. This model predicted SWc amplitude in mice exposed to simulated transequatorial or transmeridian paradigms. Taken together, we demonstrate this SDLE is a crucial mechanism influencing behavior on par with the circadian system. In a broader context, these findings mandate considering SDLE, in addition to circadian drive, for coping with health consequences of atypical light exposure in our society.