A clock for all seasons

Journal of Comparative Physiology A, Journal Year: 2024, Volume and Issue: 210(4), P. 473 - 480

Published: June 19, 2024

Abstract Circadian clocks play an essential role in adapting locomotor activity as well physiological, and metabolic rhythms of organisms to the day-night cycles on Earth during four seasons. In addition, they can serve a time reference for measuring day length adapt advance annual changes environment, which be particularly pronounced at higher latitudes. The physiological responses are also known photoperiodism. This special issue Journal Comparative Physiology A aims account diurnal photoperiodic adaptations by presenting collection ten review articles, five original research three perspective pieces. contributions include historical accounts, circadian clock models, epigenetic, molecular, neuronal mechanisms seasonal adaptations, latitudinal differences studies wild that address challenges global change.

Language: Английский

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Erwin Bünning and Wolfgang Engelmann: establishing the involvement of the circadian clock in photoperiodism

Journal of Comparative Physiology A, Journal Year: 2024, Volume and Issue: 210(4), P. 481 - 493

Published: May 28, 2024

In 1936, Erwin Bünning published his groundbreaking work that the endogenous clock is used to measure day length for initiating photoperiodic responses. His publication triggered years of controversial debate until it ultimately became basic axiom rhythm research and theoretical pillar chronobiology. Bünning's thesis frequently quoted in articles this special issue on subject "A all seasons". However, nowadays only few people know detail about experiments almost nobody knows contribution former doctoral student, Wolfgang Engelmann, theory because most topic German. The aim review give an overview important at time, including Engelmann's thesis, which he demonstrated importance circadian flower induction Flaming Katy, Kalanchoë blossfeldiana, but not Red Morning Glory, Ipomoea coccinea.

Language: Английский

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One seasonal clock fits all?

Journal of Comparative Physiology A, Journal Year: 2023, Volume and Issue: 210(4), P. 641 - 647

Published: Nov. 10, 2023

Adaptation of physiology and behavior to seasonal changes in the environment are for many organisms essential survival. Most our knowledge about underlying mechanisms comes from research on photoperiodic regulation reproduction plants, insects mammals. However, even humans, who mostly live environments with minimal influences, show annual rhythms (e.g., immune activity, brain function), sleep-wake cycles) disease prevalence infectious diseases). As variations environmental conditions may be drastically altered due climate change, understanding adaptation becomes more relevant. While species have developed specific solutions dedicated tasks regulation, we find a number common principles when comparing insect mammalian systems: (1) circadian system contributes regulation; (2) similar signaling molecules (VIP PDF) used transferring information neuroendocrine controlling response; (3) hormone melatonin participates as well mammals; (4) photoperiod affect neurotransmitter function both animal groups. The few examples overlap elaborated this perspective article, discussion relevance should seen encouragement unravel machinery multitude organisms.

Language: Английский

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Neuropeptide Dynamics Coordinate Layered Plasticity Mechanisms Adapting Drosophila Circadian Behavior to Changing Environment.

bioRxiv (Cold Spring Harbor Laboratory), Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 18, 2024

Abstract The Drosophila brain contains distinct sets of circadian oscillators responsible for generating the morning and evening bouts locomotor activity, giving rise to a bimodal rest-activity pattern in light-dark cycles. We lack mechanistic understanding how environmental changes reshape this daily profile pattern. Here, we uncover seasonal switch mechanism that remodels bout activity. Under summer-like conditions, an environment favored by fruit flies temperate climates, levels PDF neuropeptide diminish, triggering cascade. Lowered PDFR signaling disinhibits GSK3/SGG advance output. Upon sensing loss, neural activity weakens DN1p-SIF circuit, promoting afternoon rest; leading earlier appearance peak. At same time, functional connections from DN1p LNd strengthen, consequently handing over pacemaker role DN1ps. Taken together, our findings elucidate environment-induced tip balanced output clock network, aligning rhythms with time. Neuropeptide-driven parallel adjustment circuitry protein functioning likely represents conserved strategy across animal species, enabling them adapt their behavior throughout year.

Language: Английский

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Influence of temperature on the photoperiodic time measurement and on the maternal induction of diapause in Trichogramma telengai: the separation of the two effects

Journal of Insect Physiology, Journal Year: 2024, Volume and Issue: 155, P. 104654 - 104654

Published: May 23, 2024

Language: Английский

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