A2 Vertaisarvioitu katsausartikkeli tieteellisessä lehdessä
Maternal Thyroid Hormones: An Unexplored Mechanism Underlying Maternal Effects in an Ecological Framework
Tekijät: Suvi Ruuskanen, Bin-Yan Hsu
Kustantaja: UNIV CHICAGO PRESS
Julkaisuvuosi: 2018
Journal: Physiological and Biochemical Zoology
Tietokannassa oleva lehden nimi: PHYSIOLOGICAL AND BIOCHEMICAL ZOOLOGY
Lehden akronyymi: PHYSIOL BIOCHEM ZOOL
Vuosikerta: 91
Numero: 3
Aloitussivu: 904
Lopetussivu: 916
Sivujen määrä: 13
ISSN: 1522-2152
eISSN: 1537-5293
DOI: https://doi.org/10.1086/697380
Tiivistelmä
Maternal effects are currently acknowledged as important causes of transgenerational phenotypic variation and a potential mechanism to adapt offspring to predicted environments, thus having a pivotal role in ecology and evolution. Research in hormonal mechanism underlying maternal effects has focused heavily on steroid hormones. Other hormones, such as thyroid hormones (THs; thyroxine and triiodothyronine), have been largely ignored in ecological research until recently. We summarize the recent findings, identify knowledge gaps, and provide future research directions investigating the role of TH-mediated maternal effects in ecological context across taxa. Surprisingly, data on the sources of naturally occurring variation in maternal THs and their fitness effects are lacking in most vertebrate taxa. There is considerable variation in maternal TH levels in eggs across taxa. Avian egg THs show heritable variation, and data from fish and amphibians suggest female consistency in egg TH levels. In birds, variation in maternal THs was associated with important ecological factors, such as food availability and temperature. THs also showed intraindividual variation varying systematically within clutches. Importantly, exposure to maternal THs within naturally occurring range affected offspring fitness-related traits (growth and survival) in birds and fish. These findings make THs an interesting mechanism underlying maternal effects, which likely shape offspring phenotypes.
Maternal effects are currently acknowledged as important causes of transgenerational phenotypic variation and a potential mechanism to adapt offspring to predicted environments, thus having a pivotal role in ecology and evolution. Research in hormonal mechanism underlying maternal effects has focused heavily on steroid hormones. Other hormones, such as thyroid hormones (THs; thyroxine and triiodothyronine), have been largely ignored in ecological research until recently. We summarize the recent findings, identify knowledge gaps, and provide future research directions investigating the role of TH-mediated maternal effects in ecological context across taxa. Surprisingly, data on the sources of naturally occurring variation in maternal THs and their fitness effects are lacking in most vertebrate taxa. There is considerable variation in maternal TH levels in eggs across taxa. Avian egg THs show heritable variation, and data from fish and amphibians suggest female consistency in egg TH levels. In birds, variation in maternal THs was associated with important ecological factors, such as food availability and temperature. THs also showed intraindividual variation varying systematically within clutches. Importantly, exposure to maternal THs within naturally occurring range affected offspring fitness-related traits (growth and survival) in birds and fish. These findings make THs an interesting mechanism underlying maternal effects, which likely shape offspring phenotypes.
Turun yliopiston Tutkimustietojärjestelmän portaali