Article (Scientific journals)
Postnatal Effects of Sex Hormones on Click-Evoked Otoacoustic Emissions: A Study of Adolescents with Gender Dysphoria.
Burke, Sarah M.; van Heesewijk, Jason O.; Menks, Willeke M. et al.
2020In Archives of Sexual Behavior, 49 (2), p. 455-465
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Keywords :
Adolescent; Child; Cross-Sectional Studies; Female; Gender Dysphoria/blood/physiopathology; Humans; Male; Otoacoustic Emissions, Spontaneous/physiology; Sex Differentiation/physiology; Click-evoked otoacoustic emissions; Estradiol; Gender dysphoria; Gonadotropin-releasing hormone analogs; Sex differences; Testosterone
Abstract :
[en] Click-evoked otoacoustic emissions (CEOAEs) are echo-like sounds, generated by the inner ear in response to click-stimuli. A sex difference in emission strength is observed in neonates and adults, with weaker CEOAE amplitudes in males. These differences are assumed to originate from testosterone influences during prenatal male sexual differentiation and to remain stable throughout life. However, recent studies suggested activational, postnatal effects of sex hormones on CEOAEs. Adolescents diagnosed with gender dysphoria (GD) may receive gonadotropin-releasing hormone analogs (GnRHa) in order to suppress endogenous sex hormones and, therefore, pubertal maturation, followed by cross-sex hormone (CSH) treatment. Using a cross-sectional design, we examined whether hormonal interventions in adolescents diagnosed with GD (62 trans boys, assigned female at birth, self-identifying as male; 43 trans girls, assigned male at birth, self-identifying as female), affected their CEOAEs compared to age- and sex-matched controls (44 boys, 37 girls). Sex-typical differences in CEOAE amplitude were observed among cisgender controls and treatment-naïve trans boys but not in other groups with GD. Treatment-naïve trans girls tended to have more female-typical CEOAEs, suggesting hypomasculinized early sexual differentiation, in support of a prominent hypothesis on the etiology of GD. In line with the predicted suppressive effects of androgens, trans boys receiving CSH treatment, i.e., testosterone plus GnRHa, showed significantly weaker right-ear CEOAEs compared with control girls. A similar trend was seen in trans boys treated with GnRHa only. Unexpectedly, trans girls showed CEOAE masculinization with addition of estradiol. Our findings show that CEOAEs may not be used as an unequivocal measure of prenatal androgen exposure as they can be modulated postnatally by sex hormones, in the form of hormonal treatment.
Disciplines :
Neurology
Author, co-author :
Burke, Sarah M.
van Heesewijk, Jason O.
Menks, Willeke M.
Klink, Daniel T.
Kreukels, Baudewijntje P. C.
Cohen-Kettenis, Peggy T.
Bakker, Julie  ;  Université de Liège - ULiège > GIGA Neurosciences - Neuroendocrinology
Language :
English
Title :
Postnatal Effects of Sex Hormones on Click-Evoked Otoacoustic Emissions: A Study of Adolescents with Gender Dysphoria.
Publication date :
2020
Journal title :
Archives of Sexual Behavior
ISSN :
0004-0002
eISSN :
1573-2800
Publisher :
Kluwer Academic/Plenum Publishers, New York, United States - New York
Volume :
49
Issue :
2
Pages :
455-465
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 29 April 2021

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