Article (Scientific journals)
A dynamic, sex-specific expression pattern of genes regulating thyroid hormone action in the developing zebra finch song control system
Raymaekers, S.R.; Verbeure, W.; Ter Haar, S.M. et al.
2017In General and Comparative Endocrinology, 240, p. 91-102
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Keywords :
Thyroid hormones Neuroplasticity Development; Song control system; Zebra finch; Neuroplasticity; Development
Abstract :
[en] The zebra finch (Taeniopygia guttata) song control system consists of several series of interconnected brain nuclei that undergo marked changes during ontogeny and sexual development, making it an excel- lent model to study developmental neuroplasticity. Despite the demonstrated influence of hormones such as sex steroids on this phenomenon, thyroid hormones (THs) – an important factor in neural devel- opment and maturation – have not been studied in this regard. We used in situ hybridization to compare the expression of TH transporters, deiodinases and receptors between both sexes during all phases of song development in male zebra finch. Comparisons were made in four song control nuclei: Area X, the lateral magnocellular nucleus of the anterior nidopallium (LMAN), HVC (used as proper name) and the robust nucleus of the arcopallium (RA). Most genes regulating TH action are expressed in these four nuclei at early stages of development. However, while general expression levels decrease with age, the activating enzyme deiodinase type 2 remains highly expressed in Area X, HVC and RA in males, but not in females, until 90days post-hatch (dph), which marks the end of sensorimotor learning. Furthermore, the L-type amino acid transporter 1 and TH receptor beta show elevated expression in male HVC and RA respectively compared to surrounding tissue until adulthood. Differences compared to sur- rounding tissue and between sexes for the other TH regulators were minor. These developmental changes are accompanied by a strong local increase in vascularization in the male RA between 20 and 30 dph but not in Area X or HVC. Our results suggest that local regulation of TH signaling is an important factor in the development of the song control nuclei during the song learning phase and that TH activation by DIO2 is a key player in this process.
Research center :
Giga-Neurosciences - ULiège
Disciplines :
Neurosciences & behavior
Author, co-author :
Raymaekers, S.R.
Verbeure, W.
Ter Haar, S.M.
Cornil, Charlotte  ;  Université de Liège > Département des sciences biomédicales et précliniques > Biologie de la différenciation sexuelle du cerveau
Balthazart, Jacques  ;  Université de Liège > Département des sciences biomédicales et précliniques > Département des sciences biomédicales et précliniques
Darras, V.M.
Language :
English
Title :
A dynamic, sex-specific expression pattern of genes regulating thyroid hormone action in the developing zebra finch song control system
Publication date :
2017
Journal title :
General and Comparative Endocrinology
ISSN :
0016-6480
eISSN :
1095-6840
Publisher :
Elsevier, New York, United States - New York
Volume :
240
Pages :
91-102
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
BELSPO - SPP Politique scientifique - Service Public Fédéral de Programmation Politique scientifique
Available on ORBi :
since 16 January 2017

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