hrp0086s2.1 | Genetics and epigenetics of thyroid dysgenesis | ESPE2016

Determination of Autosomal Monoallelic Expression in Thyroid Tissue Assessed by Whole-Exome and Bulk RNA Sequencing: A Role in Thyroid Dysgenesis, Autoimmunity and Cancer

Deladoey Johnny

Background and hypotheses: Congenital hypothyroidism due to thyroid dysgenesis (CHTD) is a disorder with a prevalence of one in 4,000 live births, the cause of which remains unknown. The most common diagnostic category is thyroid ectopy, which occurs in up to 80% of CHTD cases. CHTD is predominantly not inherited and has a high discordance rate (>92%) between monozygotic (MZ) twins. The sporadic nature of CHTD might be explained by somatic events such as autosomal monoalle...

hrp0084p2-515 | Pituitary | ESPE2015

Contrasting Central Diabetes Insipidus due to preproAVP Mutations: Earlier Onset of Symptoms in Recessive than in Dominant Forms

Bourdet Karine , Valette Sophie , Deladoey Johnny , Vliet Guy Van

Background: Central diabetes insipidus may result from mutations in the preproAVP gene, most often heterozygous and occurring de novo or inherited in an autosomal dominant mode; in these cases, intracellular accumulation of the misfolded product of the mutated allele slowly destroys the AVP-producing neurons, so that the onset of symptoms may be delayed for up to 28 years by which time the posterior pituitary hyperintense signal is no longer visible on magnetic resonance imagi...

hrp0089rfc5.6 | Thyroid | ESPE2018

DUOX2 Deficiency in Quebec: From Life-Threatening Compressive Goiter in Infancy to Lifelong Euthyroidism

Dufort Gabrielle , Larrivee-Vanier Stephanie , Eugene Dardye , De Deken Xavier , Heinimann Karl , Szinnai Gabor , Van Vliet Guy , Deladoey Johnny

Background: Congenital hypothyroidism (CH) caused by DUOX2 deficiency has a wide range of clinical presentations and phenotype-genotype correlations are not always straightforward.Objective: To describe four children from Quebec with biallelic DUOX2 variants and widely variable phenotypes.Design/Methods: Case series of four children seen for evaluation of thyroid function at the endocrinology service of two university hospitals in ...

hrp0089fc5.2 | Thyroid | ESPE2018

Enrichment of Inherited Rare Variants in Non-Syndromic Congenital Hypothyroidism from Thyroid Dysgenesis Identified By Exome Sequencing: the Contribution of IKBKE to Vasculogenesis and Thyroid Development

Larrivee-Vanier Stephanie , Magne Fabien , Jean-Louis Martineau , Carre Aurore , Bui Helen , Samuels Mark E. , Polak Michel , Van Vliet Guy , Deladoey Johnny

Congenital hypothyroidism from thyroid dysgenesis (CHTD) is mainly a sporadic and non-syndromic condition occurring in 1:4,500 live births. In contrast to rare cases of syndromic monogenic CHTD, non-syndromic (NS) CHTD shows low familial recurrence risk (~2%) and low concordance rate between MZ twins, suggesting a two-hit scenario combining post-zygotic events with either a de novo monogenic mutation or incomplete penetrance of polygenic inherited variants,. As this l...

hrp0095fc9.4 | Pituitary, Neuroendocrinology and Puberty | ESPE2022

Delayed puberty: unraveling the different trajectories and contributions of AI

Antoniou Maria-Christina , Xu Cheng , Zouaghi Yassine , Papadakis Georgios , Stoppa-Vaucher Sophie , Kolesinska Zofia , Bouthors Thérèse , Lore Ruiz Arana Inge , Elowe-Gruau Eglantine , Phan-Hug Franziska , Pasquier Jerôme , Adamo Michela , Deladoey Johnny , Vuissoz Jean-Marc , Busiah Kanetee , Hauschild Michael , Santoni Federico , Acierno James , Pitteloud Nelly

Introduction: Differentiation between constitutional delay of growth and puberty (CDGP) and congenital hypogonadotropic hypogonadism (CHH) during early adolescence is challenging, as patients exhibit a similar clinical picture and there are no definite clinical or biochemical markers that distinguish these 2 pathologies. A delay in diagnosis, especially for CHH, may have short and long-term health consequences. The aims of this study were: 1) To evaluate the u...