Time- and season-dependent changes in the steroidogenic markers in female tree sparrow (Passer montanus)

Photochemical & Photobiological Sciences, Journal Year: 2025, Volume and Issue: unknown

Published: April 12, 2025

Language: Английский

---

Hypotheses in light detection by vertebrate ancient opsin in the bird brain

Journal of Neuroendocrinology, Journal Year: 2025, Volume and Issue: unknown

Published: March 16, 2025

Abstract Extra‐retinal photoreception is common across fish and avian species. In birds, the hypothalamus contains non‐visual photoreceptors that detect light regulate multiple endocrine systems. To date, light‐dependent control of seasonal reproduction one most well‐studied systems require deep brain photoreception. However, precise photoreceptor(s) neuroendocrine connection between opsin‐expressing cells gonadotropin‐releasing hormone‐1 (GnRH1) system remain poorly defined. past couple decades, two opsin molecules have been proposed to link detection with in birds: neuropsin (Opn5) vertebrate ancient (VA opsin). Only VA expressed GnRH1 has an absorption spectrum matches action photoperiodic reproductive response. This perspective describes how annual change daylength, referred as photoperiod, regulates reproduction. The genes are then outlined, cellular phototransduction cascade described, highlighting feature hyperpolarization response stimulation. We discuss latest evidence using short‐hairpin RNA temporarily knock down Opn5 on transcripts involved regulation Based emerging data, we outline three theoretical scenarios which might synthesis release birds. models provide a series testable hypotheses can be used improve our understanding by or other brain.

Language: Английский

---

FSHβ links photoperiodic signaling to seasonal reproduction in Japanese quail

eLife, Journal Year: 2023, Volume and Issue: 12

Published: July 12, 2023

Annual cycles in daylength provide an initial predictive environmental cue that plants and animals use to time seasonal biology. Seasonal changes photoperiodic information acts entrain endogenous programs physiology optimize animal's fitness. Attempts identify the neural molecular substrates of measurement birds have, date, focused on blunt light exposure during a restricted period photoinducibility. The objectives these studies were first characterize clock Japanese quail second, key transcripts involved endogenously generated interval timing underlies photosensitivity birds. We hypothesized mediobasal hypothalamus (MBH) provides neuroendocrine control photoperiod-induced reproductive physiology, pars distalis pituitary gland contains internal timer for short photoperiod-dependent development photosensitivity. Here, we report distinct waveforms transcript expression MBH, discovered patterns not synchronized across tissues. Follicle-stimulating hormone-β (FSHβ) increased simulated spring equinox, prior photoinduced increases prolactin, thyrotropin-stimulating hormone-β, testicular growth. Diurnal analyses showed sustained elevated levels FSHβ under conditions compared autumnal (<12L) long (>12L) photoperiods. held non-stimulatory photoperiod, indicative initiation programmed timer. These data establishes state external coincidence physiology. independent regulation alternative pathway through which other supplementary cues, such as temperature, can fine tune maturation involution.

Language: Английский

---

Dissociating Mechanisms That Underlie Seasonal and Developmental Programs for the Neuroendocrine Control of Physiology in Birds

eNeuro, Journal Year: 2024, Volume and Issue: 11(4), P. ENEURO.0154 - 23.2023

Published: March 28, 2024

Long-term programmed rheostatic changes in physiology are essential for animal fitness. Hypothalamic nuclei and the pituitary gland govern key developmental seasonal transitions reproduction. The aim of this study was to identify molecular substrates that common unique timing. Adult juvenile quail were collected from reproductively mature immature states, targets examined mediobasal hypothalamus (MBH) gland. qRT-PCR assays established deiodinase type 2 (DIO2) 3 (DIO3) expression adults changed with photoperiod manipulations. However, DIO2 DIO3 remain constitutively expressed juveniles. Pituitary transcriptome analyses 340 transcripts differentially across programs 1,189 displayed age-dependent variation expression. Prolactin (PRL) follicle-stimulating hormone subunit beta (FSHβ) markers significantly upregulated long conditions. Growth quail, regardless photoperiodic condition. These findings indicate a level cell autonomy governs physiology. Overall, paper yields novel insights into mechanisms adult brain plasticity.

Language: Английский

---

Tanycytes from a bird’s eye view: gene expression profiling of the tanycytic region under different seasonal states in the Svalbard ptarmigan

Journal of Comparative Physiology A, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 20, 2024

Language: Английский

---

Molecular basis of photoinduced seasonal energy rheostasis in Japanese Quail (Coturnix japonica).

Molecular and Cellular Endocrinology, Journal Year: 2024, Volume and Issue: 595, P. 112415 - 112415

Published: Nov. 17, 2024

Language: Английский

---