Gonads or body? Differences in gonadal and somatic photoperiodic growth response in two vole species
| Autor: | Roelof A. Hut, Laura van Rosmalen, David G. Hazlerigg, Jayme van Dalum |
|---|---|
| Přispěvatelé: | Hut lab |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Physiology
DIO2 THYROID-HORMONE 0302 clinical medicine TEMPERATURE reproductive and urinary physiology media_common photoperiodism 0303 health sciences biology Arvicolinae REPRODUCTIVE DEVELOPMENT food and beverages MATERNAL TRANSFER Circadian Rhythm Microtus Photoperiodism Seasons Reproduction hormones hormone substitutes and hormone antagonists EXPRESSION MELATONIN endocrine system Photoperiod media_common.quotation_subject Deiodinase Zoology Aquatic Science 03 medical and health sciences LEAF GROWTH Latitudinal adaptation VDP::Mathematics and natural science: 400::Zoology and botany: 480 Animals MICROTUS-OECONOMUS HAMSTERS PHODOPUS-SUNGORUS Gonads Molecular Biology Ecology Evolution Behavior and Systematics 030304 developmental biology Seasonality Southern vole PARS TUBERALIS biology.organism_classification Insect Science biological sciences biology.protein Animal Science and Zoology Vole Adaptation 030217 neurology & neurosurgery VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480 |
| Zdroj: | The Journal of Experimental Biology, 223. COMPANY OF BIOLOGISTS LTD |
| ISSN: | 0022-0949 |
| Popis: | To optimally time reproduction, seasonal mammals use a photoperiodic neuroendocrine system (PNES) that measures photoperiod and subsequently drives reproduction. To adapt to late spring arrival at northern latitudes, a lower photoperiodic sensitivity and therefore a higher critical photoperiod for reproductive onset is necessary in northern species to arrest reproductive development until spring onset. Temperature–photoperiod relationships, and hence food availability–photoperiod relationships, are highly latitude dependent. Therefore, we predict PNES sensitivity characteristics to be latitude dependent. Here, we investigated photoperiodic responses at different times during development in northern (tundra or root vole, Microtus oeconomus) and southern vole species (common vole, Microtus arvalis) exposed to constant short (SP) or long photoperiod (LP). Although the tundra vole grows faster under LP, no photoperiodic effect on somatic growth is observed in the common vole. In contrast, gonadal growth is more sensitive to photoperiod in the common vole, suggesting that photoperiodic responses in somatic and gonadal growth can be plastic, and might be regulated through different mechanisms. In both species, thyroid-stimulating hormone β-subunit (Tshβ) and iodothyronine deiodinase 2 (Dio2) expression is highly increased under LP, whereas Tshr and Dio3 decrease under LP. High Tshr levels in voles raised under SP may lead to increased sensitivity to increasing photoperiods later in life. The higher photoperiodic-induced Tshr response in tundra voles suggests that the northern vole species might be more sensitive to thyroid-stimulating hormone when raised under SP. In conclusion, species differences in developmental programming of the PNES, which is dependent on photoperiod early in development, may form different breeding strategies as part of latitudinal adaptation. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|