Eurythermal fish acclimatization and nucleolar function: a review

Álvarez, Marco; Molina, Alfredo; Quezada, Claudia; Pinto, Rodrigo; Krauskopf, Manuel; Vera, María

doi:10.1016/j.jtherbio.2004.08.036

Cited by 8 publications

(8 citation statements)

References 40 publications

(42 reference statements)

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“…Fish may also respond to temperature changes by acclimatization, which involves compensatory shifts in physiological parameters (Alvarez et al. ; Grenchik et al. ).…”

Section: Introductionmentioning

confidence: 99%

“…Ectotherms in the wild usually make some behavioral attempt (so-called thermoregulatory behavior) to avoid extreme temperatures and minimize acute changes in body temperature (McCue 2004). Fish may also respond to temperature changes by acclimatization, which involves compensatory shifts in physiological parameters (Alvarez et al 2004;Grenchik et al 2013). However, poleward shifts in the distribution of various fish species (Perry et al 2005;Poloczanska et al 2012;Engelhard et al 2014) indicate a response consistent with a limited ability by these species to adjust their thermal window to warming ocean temperatures.…”

Section: Introductionmentioning

confidence: 99%

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Behavioral responses of Atlantic cod to sea temperature changes

Freitas

Olsen

Moland

et al. 2015

Ecology and Evolution

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Understanding responses of marine species to temperature variability is essential to predict impacts of future climate change in the oceans. Most ectotherms are expected to adjust their behavior to avoid extreme temperatures and minimize acute changes in body temperature. However, measuring such behavioral plasticity in the wild is challenging. Combining 4 years of telemetry-derived behavioral data on juvenile and adult (30–80 cm) Atlantic cod (Gadus morhua), and in situ ocean temperature measurements, we found a significant effect of sea temperature on cod depth use and activity level in coastal Skagerrak. During summer, cod were found in deeper waters when sea surface temperature increased. Further, this effect of temperature was stronger on larger cod. Diel vertical migration, which consists in a nighttime rise to shallow feeding habitats, was stronger among smaller cod. As surface temperature increased beyond ∼15°C, their vertical migration was limited to deeper waters. In addition to larger diel vertical migrations, smaller cod were more active and travelled larger distances compared to larger specimens. Cold temperatures during winter tended, however, to reduce the magnitude of diel vertical migrations, as well as the activity level and distance moved by those smaller individuals. Our findings suggest that future and ongoing rises in sea surface temperature may increasingly deprive cod in this region from shallow feeding areas during summer, which may be detrimental for local populations of the species.

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“…Fish may also respond to temperature changes by acclimatization, which involves compensatory shifts in physiological parameters (Alvarez et al. ; Grenchik et al. ).…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Behavioral responses of Atlantic cod to sea temperature changes

Freitas

Olsen

Moland

et al. 2015

Ecology and Evolution

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“…Thus, fish are living under large fluctuations of physical parameters, such as photoperiod, water temperature, nutrition availability, oxygen concentration, and salinity, among others [2]. In this context, the common carp provides a powerful, natural, non-manipulated model for studying several molecular and cellular responses as part of the acclimatization process [2,3]. …”

Section: Introductionmentioning

confidence: 99%

“…Particularly in carp, this process undergoes dramatic changes in the context of adaptation to summer and winter [3]. Previously, we demonstrated that epigenetic mechanisms contribute to the transcriptional regulation of ribosomal genes concomitant with the acclimatization process.…”

Section: Introductionmentioning

confidence: 99%

Epigenetic regulation of the ribosomal cistron seasonally modulates enrichment of H2A.Z and H2A.Zub in response to different environmental inputs in carp (Cyprinus carpio)

Simonet

Reyes

Nardocci

et al. 2013

Epigenetics & Chromatin

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BackgroundThe specific deposition of histone variants into chromatin is an important epigenetic mechanism that contributes to gene regulation through chromatin architectural changes. The histone variant H2A.Z is essential in higher eukaryotes, and its incorporation within chromatin is a relevant process for gene expression and genome stability. However, the dual positive and negative roles of H2A.Z in gene regulation still remain unclear. We previously reported that acclimatization in common carp fish (Cyprinus carpio) involves cyclical seasonal gene reprogramming as an adaptation response to its natural environment, when rRNA synthesis and processing are profoundly affected. Epigenetic mechanisms primarily contribute to the transcriptional modulation of ribosomal genes concomitant with the acclimatization process, thus significantly regulating this process. The aim of this study was to describe the presence of several H2A.Z subtypes in carp, and assess the role of H2A.Z on the ribosomal cistron in summer- and winter-acclimatized carp.ResultsThis paper reports for the first time about the transcriptional expression of four different H2A.Z subtypes belonging to the same organism. Remarkably, a novel H2A.Z.7 was found, which corresponds to a tissue-specific histone subtype that contains seven amino acid residues longer than the canonical H2A.Z. Moreover, H2A.Z enrichment through the ribosomal cistron was significantly higher during summer, when rRNA transcription and processing are highly active, than it was in winter. Similar patterns of H2A.Z enrichment are found in two seasonally active promoters for genes transcribed by RNA polymerase II, the L41 and Δ9-desaturase genes. Interestingly, ubiquitylated-H2A.Z (H2A.Zub) was strongly enriched on regulatory regions of the ribosomal cistron in summer-acclimatized carp. Additionally, H2A.Z was present in both heterochromatin and euchromatin states on ribosomal cistron and RNA polymerase II promoters.ConclusionsOur study revealed seasonally-dependent H2A.Z enrichment for active ribosomal cistron and RNA polymerase II promoters during the carp environmental adaptation. Moreover, seasonal H2A.Zub enrichment appears as a specific mechanism contributing to the regulation of chromatin architecture under natural conditions. The existence of several H2A.Z subtypes in carp suggests that the epigenetic regulation in this species constitutes a complex and finely tuned mechanism developed to cope with seasonal environmental changes that occur in its habitat.

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“…These entail summer and winter rearrangements of molecular and cellular functions and involve the modulation of gene expression [Dietz and Somero, 1992;Vera et al, 1993;Kausel et al, 1999;Sarmiento et al, 2000;Fletcher et al, 2001;Alvarez et al, 2004;Pinto et al, 2005]. Similarly, temperature acclimation, even though a distinctive process [Somero and Hochachka, 2002] also demands gene expression regulation to provide the homeostatic state that fish require for survival [Goldspink, 1995;Figueroa et al, 1997;Arends et al, 1998;Gracey et al, 2004;Podrabsky and Somero, 2004].…”

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confidence: 99%

Gene structure and seasonal expression of carp fish prolactin short receptor isoforms

Martin¹,

Hurtado²,

Quezada³

et al. 2006

J of Cellular Biochemistry

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The complex adaptive mechanisms that eurythermal fish have evolved in response to the seasonal changes of the environment include the transduction of the physical parameter variations into neuroendocrine signals. Studies in carp (Cyprinus carpio) have indicated that prolactin (PRL) and growth hormone (GH) expression is associated with acclimatization, suggesting that the pituitary gland is a relevant physiological node in this adaptive process. Also, the distinctive pattern of expression that carp prolactin receptor (PRLr) protein depicts upon seasonal acclimatization supports the hypothesis that PRL and its receptor clearly are involved in the new homeostatic stage that the eurythermal fish needs to survive during the cyclical changes of its habitat. Here, we characterize the first prolactin receptor gene in a teleost and show that its expression is not associated with alternative promoters, unlike in humans and rodents. Using the regulatory region to direct the transcription of green fluorescent protein (GFP) in zebrafish embryos, we mapped the appearance of this hormone receptor during fish development. This is the first report identifying a fish prolactin receptor gene expressing transcript isoforms encoding for short forms of the protein (45 kDa). These have been found in osmoregulatory tissues of the carp and are regulated in connection with the seasonal acclimatization of the fish.

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Eurythermal fish acclimatization and nucleolar function: a review

Cited by 8 publications

References 40 publications

Behavioral responses of Atlantic cod to sea temperature changes

Behavioral responses of Atlantic cod to sea temperature changes

Epigenetic regulation of the ribosomal cistron seasonally modulates enrichment of H2A.Z and H2A.Zub in response to different environmental inputs in carp (Cyprinus carpio)

Gene structure and seasonal expression of carp fish prolactin short receptor isoforms

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