Genetic Analysis of Drosophila Circadian Behavior in Seminatural Conditions

Green, Edward W.; O’Callaghan, Emma K.; Pegoraro, Mirko; Armstrong, J. D.; Costa, Rodolfo; Kyriacou, Charalambos P.

doi:10.1016/bs.mie.2014.10.001

Cited by 7 publications

(5 citation statements)

References 32 publications

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“…Adult flies activity was assayed using the multi-beam system (MB5, TriKinetics) as previously described (Green et al, 2015; McParland et al, 2015). Briefly, individual males aged 1–3 days were inserted into 5 mm ×80 mm glass pyrex tubes.…”

Section: Methodsmentioning

confidence: 99%

Glial Ca2+signaling links endocytosis to K+ buffering around neuronal somas to regulate excitability

Weiss

Melom

Ormerod

et al. 2019

eLife

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Glial-neuronal signaling at synapses is widely studied, but how glia interact with neuronal somas to regulate their activity is unclear. Drosophila cortex glia are restricted to brain regions devoid of synapses, providing an opportunity to characterize interactions with neuronal somas. Mutations in the cortex glial NCKXzydeco elevate basal Ca2+, predisposing animals to seizure-like behavior. To determine how cortex glial Ca2+ signaling controls neuronal excitability, we performed an in vivo modifier screen of the NCKXzydeco seizure phenotype. We show that elevation of glial Ca2+ causes hyperactivation of calcineurin-dependent endocytosis and accumulation of early endosomes. Knockdown of sandman, a K2P channel, recapitulates NCKXzydeco seizures. Indeed, sandman expression on cortex glial membranes is substantially reduced in NCKXzydeco mutants, indicating enhanced internalization of sandman predisposes animals to seizures. These data provide an unexpected link between glial Ca2+ signaling and the well-known role of glia in K+ buffering as a key mechanism for regulating neuronal excitability.

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Section: Methodsmentioning

confidence: 99%

Glial Ca2+signaling links endocytosis to K+ buffering around neuronal somas to regulate excitability

Weiss

Melom

Ormerod

et al. 2019

eLife

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“…For larval activity monitoring, wandering 3 rd instar larval activity was assayed using a multi-beam system (MB5, TriKinetics) as previously described (Green et al, 2015). Briefly, individual animals were GMR85G01-Gal4 (Kremer, et al, 2017) RRID:BDSC_40436…”

Section: Behavioral Analysismentioning

confidence: 99%

Glial ER and GAP junction mediated Ca²⁺ waves are crucial to maintain normal brain excitability

Weiss

Clamon

Manoim

et al. 2021

Glia

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Astrocytes play key roles in regulating multiple aspects of neuronal function from invertebrates to humans and display Ca2+ fluctuations that are heterogeneously distributed throughout different cellular microdomains. Changes in Ca2+ dynamics represent a key mechanism for how astrocytes modulate neuronal activity. An unresolved issue is the origin and contribution of specific glial Ca2+ signaling components at distinct astrocytic domains to neuronal physiology and brain function. The Drosophila model system offers a simple nervous system that is highly amenable to cell‐specific genetic manipulations to characterize the role of glial Ca2+ signaling. Here we identify a role for ER store‐operated Ca2+ entry (SOCE) pathway in perineurial glia (PG), a glial population that contributes to the Drosophila blood–brain barrier. We show that PG cells display diverse Ca2+ activity that varies based on their locale within the brain. Ca2+ signaling in PG cells does not require extracellular Ca2+ and is blocked by inhibition of SOCE, Ryanodine receptors, or gap junctions. Disruption of these components triggers stimuli‐induced seizure‐like episodes. These findings indicate that Ca2+ release from internal stores and its propagation between neighboring glial cells via gap junctions are essential for maintaining normal nervous system function.

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“…The adopted device combines outputs of 6 groups of light-emitting diodes (LEDs) with different emission spectra (Fig. 1B) and dictates sophisticated light profiles with progressively changing light intensity over the day (described also in Vanin et al, 2012;Green et al, 2015aGreen et al, , 2015b. Twilight data were accessed from the online database of the United States Naval Observatory (USNO) Astronomy Application Department, "Rise, Set, and Twilight Definitions" (http://aa.usno.navy.mil/faq/docs/RST_defs.php).…”

Section: Simulation Of Fall and Summer Profilesmentioning

confidence: 99%

A Semi-natural Approach for Studying Seasonal Diapause in Drosophila melanogaster Reveals Robust Photoperiodicity

Nagy

Andreatta

Bastianello³

et al. 2018

J Biol Rhythms

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The fruit fly Drosophila melanogaster survives thermally stressful conditions in a state of reproductive dormancy (diapause), manifested by reduced metabolic activity and arrested ovarian development in females. Unlike insects that rely primarily on photoperiodic stimuli to initiate the diapause program, in this species dormancy is regulated by low temperature and enhanced by shorter photoperiods. Overwintering phenotypes are usually studied under simple laboratory conditions, where animals are exposed to rectangular light-dark (LD) cycles at a constant temperature. We sought to adopt more realistic diapause protocols by generating LD profiles that better mimic outdoor conditions. Experimental flies were subjected to semi-natural late autumn and summer days, while control females received the same amounts of light but in rectangular LD cycles (LD 8:16 and LD 15:9, respectively). We observed that semi-natural autumnal days induced a higher proportion of females to enter dormancy, while females in semi-natural summer days showed reduced diapause compared with their corresponding rectangular controls, generating an impressive photoperiodic response. In contrast, under rectangular light regimes, the diapause of Drosophila field lines exhibited minimal photoperiodicity. Our semi-natural method reveals that D. melanogaster diapause is considerably more photoperiodic than previously believed and suggests that this seasonal response is best studied under simulated natural lighting conditions.

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Genetic Analysis of Drosophila Circadian Behavior in Seminatural Conditions

Cited by 7 publications

References 32 publications

Glial Ca2+signaling links endocytosis to K+ buffering around neuronal somas to regulate excitability

Glial Ca2+signaling links endocytosis to K+ buffering around neuronal somas to regulate excitability

Glial ER and GAP junction mediated Ca²⁺ waves are crucial to maintain normal brain excitability

A Semi-natural Approach for Studying Seasonal Diapause in Drosophila melanogaster Reveals Robust Photoperiodicity

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Genetic Analysis of Drosophila Circadian Behavior in Seminatural Conditions

Cited by 7 publications

References 32 publications

Glial Ca2+signaling links endocytosis to K+ buffering around neuronal somas to regulate excitability

Glial Ca2+signaling links endocytosis to K+ buffering around neuronal somas to regulate excitability

Glial ER and GAP junction mediated Ca2+ waves are crucial to maintain normal brain excitability

A Semi-natural Approach for Studying Seasonal Diapause in Drosophila melanogaster Reveals Robust Photoperiodicity

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Glial ER and GAP junction mediated Ca²⁺ waves are crucial to maintain normal brain excitability