A photoperiodic molecular response in migratory redheaded bunting exposed to a single long day

Majumdar, Gaurav; Yadav, Garima; Rani, Sangeeta; Kumar, Vinod

doi:10.1016/j.ygcen.2014.04.013

Cited by 32 publications

(37 citation statements)

References 37 publications

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“…Interestingly, there are suggested overlaps in the functional roles of some of the molecules, described above. For example, eya3 possibly acts as a photoreceptive molecule, as evidenced by recent studies on redheaded buntings, Emberiza bruniceps (Majumdar et al, 2014(Majumdar et al, , 2015. There was a positive correlation of hypothalamic rhodopsin on eya3 mRNA expression (Majumdar et al, 2015), and the eya3 peptide was found expressed in the septal lateralis (SL; Majumdar et al, 2014) in buntings exposed to a single long days.…”

Section: Introductionmentioning

confidence: 89%

“…For example, eya3 possibly acts as a photoreceptive molecule, as evidenced by recent studies on redheaded buntings, Emberiza bruniceps (Majumdar et al, 2014(Majumdar et al, , 2015. There was a positive correlation of hypothalamic rhodopsin on eya3 mRNA expression (Majumdar et al, 2015), and the eya3 peptide was found expressed in the septal lateralis (SL; Majumdar et al, 2014) in buntings exposed to a single long days. The SL has also been shown expressing the rhodopsin in ring doves, Streptopelia risoria (Silver et al, 1988) and house sparrows, Passer domesticus (Wang and Wingfield, 2011).…”

Section: Introductionmentioning

confidence: 89%

“…Relative mRNA expression was calculated by subtracting individual ct values for each sample from the ct value of b-actin (internal control), and the DC t value was further subtracted from DC t value of a sample comprising the sample mix of a group. DDC t value thus obtained was plotted as 2 ÀDDCt (Livak and Schmittgen, 2001;Majumdar et al, 2014Majumdar et al, , 2015.…”

Section: Experiments 1: Mrna Expression Of Genes Involved In Photoperimentioning

confidence: 99%

“…Briefly, to a group (n = 4) of buntings on SD, the light period on day 6 was extended until hour 16; thus these birds received day 6 as 16L:8D. Then during the first hour on day 7 when light did not come on, these birds as well as a group (n = 4) of birds on SD were transcardially perfused with 4% paraformaldehyde under the background illumination as was during the dark period in preceding LD cycles, as described previously in Majumdar et al (2014). Eyes were dissected out, post fixed over night in the same paraformaldehyde solution and cryoprotected by passing through ascending gradients (10%, 20% and 30%) of sucrose solution.…”

Section: Experiments 2: Eya3 Tsh-b and Rhodopsin Peptide Expressionsmentioning

confidence: 99%

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Bird eyes distinguish summer from winter: Retinal response to acute photoperiod change in the night-migratory redheaded bunting

Majumdar

Yadav

Rani

et al. 2015

Journal of Chemical Neuroanatomy

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Section: Introductionmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 89%

Section: Experiments 1: Mrna Expression Of Genes Involved In Photoperimentioning

confidence: 99%

Section: Experiments 2: Eya3 Tsh-b and Rhodopsin Peptide Expressionsmentioning

confidence: 99%

See 2 more Smart Citations

Bird eyes distinguish summer from winter: Retinal response to acute photoperiod change in the night-migratory redheaded bunting

Majumdar

Yadav

Rani

et al. 2015

Journal of Chemical Neuroanatomy

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“…The portion of each gene of interest (pdc, pdk, cs, odgh, sdhd and mdh) was cloned and sequenced as described in recent publications from our laboratory Majumdar et al, 2014;Trivedi et al, 2014). Briefly, cDNA was prepared from 1 μg DNase (Promega, M610A) treated RNA (extracted by Tri Reagent solution; Promega, AM9738) using a RevertAid First Strand cDNA Synthesis kit (Thermo Scientific, K1622).…”

Section: Cloning Sequencing and Measurement Of Mrna Levels Of A Genementioning

confidence: 99%

Adaptation of oxidative phosphorylation to photoperiod-induced seasonal metabolic states in migratory songbirds

Trivedi

Malik

Rani

et al. 2015

Comparative Biochemistry and Physiology Part A: Molecular &

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Photoperiodic regulation of avian physiology: From external coincidence to seasonal reproduction

2022

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Seasonal cycles of environmental cues generate variation in the timing of life‐history transition events across taxa. It is through the entrainment of internal, endogenous rhythms of organisms to these external, exogenous rhythms in environment, such as cycling temperature and daylight, by which organisms can regulate and time life history transitions. Here, we review the current understanding of how photoperiod both stimulates and terminates seasonal reproduction in birds. The review describes the role of external coincidence timing, the process by which photoperiod is proposed to stimulate reproductive development. Then, the molecular basis of light detection and the photoperiodic regulation of neuroendocrine timing of seasonal reproduction in birds is presented. Current data indicates that vertebrate ancient opsin is the predominant photoreceptor for light detection by the hypothalamus, compared to neuropsin and rhodopsin. The review then connects light detection to well‐characterized hypothalamic and pituitary gland molecules involved in the photoperiodic regulation of reproduction. In birds, Gonadotropin‐releasing hormone synthesis and release are controlled by photoperiodic cues via thyrotropin‐stimulating hormone‐β (TSHβ) independent and dependent pathways, respectively. The review then highlights the role of D‐box and E‐box binding motifs in the promoter regions of photoperiodic genes, in particular Eyes‐absent 3, as the key link between circadian clock function and photoperiodic time measurement. Based on the available evidence, the review proposes that at least two molecular programs form the basis for external coincidence timing in birds: photoperiodic responsiveness by TSHβ pathways and endogenous internal timing by gonadotropin synthesis.

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A photoperiodic molecular response in migratory redheaded bunting exposed to a single long day

Cited by 32 publications

References 37 publications

Bird eyes distinguish summer from winter: Retinal response to acute photoperiod change in the night-migratory redheaded bunting

Bird eyes distinguish summer from winter: Retinal response to acute photoperiod change in the night-migratory redheaded bunting

Adaptation of oxidative phosphorylation to photoperiod-induced seasonal metabolic states in migratory songbirds

Photoperiodic regulation of avian physiology: From external coincidence to seasonal reproduction

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