ESPE Abstracts

Background: Primary IGF1 deficiency (PIGFD) is a rare condition defined by low IGF1 levels, GH sufficiency and absence of secondary causes of growth failure. PIGFD is an approved indication for treatment with recombinant IGF1 (rIGF1). Its genetic causes remain largely unknown.Objective and hypotheses: To elucidate genetic causes of PIGFD.Method: Clinical phenotyping followed by trio-based whole-exome sequencing (WES) in 11 complete...

Background: Ttf1−/− mice had complete absence of follicular and parafollicular cells, agenesis of lung parenchyma, ventral forebrain, and pituitary. Congenital hypothyroidism (CH) patients with chromosomal deletions encompassing the TTF1 locus and point mutations in the TTF1 gene confirmed its implication in the phenotype: CH with a thyroid gland in place, associated with respiratory distress syndro...

Background: Various aspects of IGF1R defects have been analysed to date, but the effects of IGF1R haploinsufficiency bone status and metabolism were rarely investigated.Objective and hypotheses: To study bone metabolism and structure in a case of Insulin-like growth factor-I (IGF-I) receptor (IGF1R) gene deletion.Method: Genetic analysis, GH stimulation, rhGH treatme...

The growth hormone (GH)-insulin-like growth factor (IGF-1) system is essential for optimal human growth and energy homeostasis. Deficiency of pregnancy-associated plasma protein-A2 (PAPP-A2), a protease involved in the liberation of free IGF-1, leads to problems in growth and bone density in humans and mice. Patients with PAPP-A2 deficiency also present lower body mass and mild glucose intolerance. The present study aimed to determine the influence of 1 month of high carbohydr...

For the brain tumor committee of SFCE (Société Française des Cancers de l’Enfant).Objective: Therapeutic approach favors chemotherapy as the first-line-treatment in progressing OPG. There are few data on long term endocrine outcomes of aggressive OPG treated by upfront chemotherapy. Our main objective was to describe the long-term endocrine sequelae in these patients and to identify potential early predictors of the endocrine involvem...

Background: The genetic etiology of non-syndromic HI remains unknown in over 20% of all cases, and over 50% of diazoxide-responsive cases. Non-coding variants in HK1 have been suggested to cause HI by linkage-analysis (Pinney et al., 2008). More recently, variants within a regulatory region of HK1 intron 2 were reported in 17 individuals with HI (Wakeling et al., 2022). These variants have been proposed to cause HI by disrup...

Background: In pediatric patients multiple pituitary hormone deficiency (MPHD) can be caused by mutations in pituitary-specific transcription factors. Among those, mutations in PROP1 gene account for ~50% of genetically determined cases of CPHD. Regarding morphology, the anterior pituitary can be normal, hypo-/aplastic or enlarged.Results: We present two unrelated patients referred for evaluation of growth retardation. Both had profound growth retardatio...

Background: DLK1 (PREF1) is a key inhibitor of adipogenesis and adipocyte differentiation. Adipose tissue expansion depends on adequate adipocyte differentiation. However, whether lower DLK1 expression facilitates adipose tissue expansion following fetal growth restriction is so far unknown.Objective and hypotheses: To study the expression of DLK1 in the adipose tissue of prenatally growth-restricted rats and its relat...

Introduction: Physical activity (PA) is one of the treatments to promote weight loss in children with obesity. The WHO advices to perform moderate to vigorous (MV) PA during 60-min daily. It is necessary to measure the effect of increasing PA and the adherence to therapy.Aims: To evaluate PA using accelerometry at the onset and after 8 weeks of treatment with nutritional intervention and increase in PA.Patients, material and method...

Background: OTX2 is expressed in the human brain and plays a key role in the eye development. OTX2 mutations are reported in patients with ano/microphtalmia, optic nerve or optic chiasm hypoplasia, ocular coloboma and retinal dystrophies, associated in some cases with brain or pituitary abnormalities.Objective and hypotheses: Most of OTX2 mutations are nonsense or frameshift, more rarely missense mutations occur.Method: We...