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Sterol-Targeted Laboratory Evolution Allows the Isolation of Thermotolerant and Respiratory-Competent Clones of the Industrial Yeast Saccharomyces cerevisiae.
Microb Biotechnol
January 2025
Department of Biotechnology, Instituto de Agroquímica y Tecnología de los Alimentos, Consejo Superior de Investigaciones Científicas, Paterna, Valencia, Spain.
Sterol composition plays a crucial role in determining the ability of yeast cells to withstand high temperatures, an essential trait in biotechnology. Using a targeted evolution strategy involving fluconazole (FCNZ), an inhibitor of the sterol biosynthesis pathway, and the immunosuppressant FK506, we aimed to enhance thermotolerance in an industrial baker's yeast population by modifying their sterol composition. This approach yielded six isolates capable of proliferating in liquid YPD with μ values ranging from 0.
View Article and Find Full Text PDFHeat-Evolved Microalgae (Symbiodiniaceae) Are Stable Symbionts and Influence Thermal Tolerance of the Sea Anemone Exaiptasia diaphana.
Environ Microbiol
January 2025
Australian Institute of Marine Science, Townsville, Queensland, Australia.
Symbiotic cnidarians, such as sea anemones and corals, rely on their mutualistic microalgal partners (Symbiodiniaceae) for survival. Marine heatwaves can disrupt this partnership, and it has been proposed that introducing experimentally evolved, heat-tolerant algal symbionts could enhance host thermotolerance. To test this hypothesis, the sea anemone Exaiptasia diaphana (a coral model) was inoculated with either the heterologous wild type or heat-evolved algal symbiont, Cladocopium proliferum, and homologous wild-type Breviolum minutum.
View Article and Find Full Text PDFDelineating the emergence of thermally tolerant Symbiodiniaceae genotypes across the dominant coral species of a turbid reef: Adaptation and resilience strategy.
Sci Total Environ
January 2025
Department of Microbiology, Pondicherry University, Kalapet, Puducherry 605014, India. Electronic address:
Climate change-induced rise in sea surface temperatures has led to an increase in the frequency and severity of coral bleaching events, ultimately leading to the deterioration of coral reefs, globally. However, the reef-building corals have an inherent capacity to acclimatize to thermal stress on pre-exposure to high temperatures by altering their endosymbiotic Symbiodiniaceae community composition towards a thermal tolerant composition. This reorganisation may become an important tool in coral's resilience to rapid environmental change.
View Article and Find Full Text PDFEffect of condensed heat acclimation on thermophysiological adaptations, hypoxic cross-tolerance, exercise performance and de-acclimation.
J Appl Physiol (1985)
January 2025
Extreme Environments Laboratory, School of Psychology, Sport and Health Sciences, University of Portsmouth, UK.
Short duration heat acclimation (HA) (≤5 daily heat exposures) elicits incomplete adaptation compared to longer interventions, possibly due to the lower accumulated thermal 'dose'. It is unknown if matching thermal 'dose' over a shorter timescale elicits comparable adaptation to a longer intervention. Using a parallel-groups design, we compared: i) 'condensed' HA (CHA; =17 males) consisting of 4×75 min∙day heat exposures (target rectal temperature ()=38.
View Article and Find Full Text PDFHeat acclimation defense against exertional heat stroke by improving the function of preoptic TRPV1 neurons.
Theranostics
January 2025
Department of Critical Care Medicine and Department of Anaesthesiology, Xijing Hospital, Fourth Military Medical University, Xi'an, Shaanxi, China, 710032.
Record-breaking heatwaves caused by greenhouse effects lead to multiple hyperthermia disorders, the most serious of which is exertional heat stroke (EHS) with the mortality reaching 60 %. Repeat exercise with heat exposure, termed heat acclimation (HA), protects against EHS by fine-tuning feedback control of body temperature (Tb), the mechanism of which is opaque. This study aimed to explore the molecular and neural circuit mechanisms of the HA training against EHS.
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