Searchable abstracts of presentations at key conferences in endocrinology
Endocrine Abstracts (2019) 63 P312 | DOI: 10.1530/endoabs.63.P312

University of Liège, Liege, Belgium.


Introduction: Neurokinin B (NKB) is a neurotransmitter, regulating GnRH. NKB activates its receptor TACR3. Recessive mutations of TACR3 are associated with a phenotype of normosmic hypogonadism.

Case report: A 17 years old man born in Turkey, present with pubertal delay. He is treated 3 years with testosterone and he is reevaluated without treatment. He is 1.79 m and 1.85 arm span, testicular volume: 3 and 4 ml. He has no olfactory troubles. Testosterone 1.87 nmol/L, Estradiol <17 ng/L, LH 2,3 UI/L, FSH 1,6 UI/L. Pituitary MRI is normal.

Genetic analysis: A set of 16 causatives genes for IHH and KS were investigated by Next Generation Sequencing. We were able to identify a novel heterozygous TACR3 variant (c.530C>A, p.(Thr177Lys)) that is predicted to be deleterious by in silico analysis (Polyphen, Mutation Taster, Mutation Assessor). This variant is located in the ‘GPCR, rhodopsin-like’ protein domain and lead to the replacement of Thr177 by a Lysine residue. Functional studies are needed to evaluate the deleterious impact on the NKR3 receptor.

Conclusions: We describe a novel TAC3R mutation associated with normosmic hypogonadotropic hypogonadism. The phenotype is intriguing, because a second pathogen mutation is expected but it was not found with our panel. Further gene investigations will be undertaken.

Volume 63

21st European Congress of Endocrinology

Lyon, France
18 May 2019 - 21 May 2019

European Society of Endocrinology 

Browse other volumes

Article tools

My recent searches

No recent searches.