Dim light melatonin onset following simulated eastward travel is earlier in young males genotyped as PER35/5 than PER34/4

Lovemore Kunorozva, Dale E Rae, Laura Roden

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    Inter-individual variability exists in recovery from jetlag following travel across time zones. Part of this variation may be due to genetic differences at the variable number tandem repeat (VNTR) polymorphism of the PERIOD3 (PER3) gene as this polymorphism has been associated with chronotype and sleep, as well as sensitivity to blue light on melatonin suppression. To test this hypothesis we conducted a laboratory-based study to compare re-entrainment in males genotyped as PER34/4 (n=8) and PER35/5 (n=8) following simulated eastward travel across six time zones. The recovery strategy included morning blue-enriched light exposure and appropriately-timed meals during the first 24h after simulated travel. Dim light melatonin onset (DLMO), sleep characteristics, perceived sleepiness levels (Stanford Sleepiness Scale), and resting metabolic parameters were measured during constant routine periods before and after simulated travel. While DLMO time was similar between the two groups prior to simulated eastward travel (p=0.223), it was earlier in the PER35/5 group (17h23 (17h15; 17h37)) than the PER34/4 group (18h05 (17h53; 18h12)) afterwards (p=0.046). During resynchronisation, perceived sleepiness and metabolic parameters were similar to pre-travel in both groups but sleep was more disturbed in the PER35/5 group (total sleep time: p=0.008, sleep efficiency: p=0.008, wake after sleep onset: p=0.023). The PER3 VNTR genotype may influence the efficacy of re-entrainment following trans-meridian travel when blue-enriched light exposure is incorporated into the recovery strategy on the first day following travel.
    Original languageEnglish
    Pages (from-to)1611-1623
    Number of pages13
    JournalChronobiology International
    Issue number12
    Early online date2 Nov 2022
    Publication statusPublished - 2 Dec 2022

    Bibliographical note

    © 2022 The Author(s). Published with license by Taylor & Francis Group, LLC.
    This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use,
    distribution, and reproduction in any medium, provided the original work is properly cited.


    • Phase shift
    • blue light
    • circadian rhythm
    • jetlag
    • PER3 VNTR polymorphism


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