ESPE Abstracts

Background: Haplo-insufficiency of the Myelin-Regulatory Factor (MYRF) gene causes cardiac-urogenital syndrome (CUGS) and Differences in Sexual Development (DSD) in 46,XY and 46,XX (OMIM #618280). The gene product, a transcription factor, is involved in development of Coelomic epithelium derived cells, and likely causative for DSD. To date, only a few MYRF de novo variants are reported in children with DSD and associated CUGS symptoms.<s...

Introduction: C-type natriuretic peptide receptor encoded by NPR2 gene stimulates chondrocyte differentiation and hypertrophy and extracellular matrix production within the growth plate. The phenotypical spectrum of NPR2 mutations is broad, from severe autosomal recessive acromesomelic dysplasia to milder autosomal dominant growth disorders. Some children with NPR2 variants are treated with growth hormone (GH), however, with the inco...

Introduction: Ox in a dose of 0.03-0.05 mg/kg per day in addition to GH treatment significantly increases adult height in TS more than GH alone. To date, the long term effects of Ox in childhood on bone mineral density (BMD) in adulthood are unknown.Methods: This is a follow-up study of a previous randomized controlled trial, performed in the Netherlands. In the original trial, 133 girls were treated with GH. Placebo (Pl...

Background: Children born small for gestational age (SGA) exhibit wide variations in the activity of growth hormone (GH)/insulin–like growth factor–I (IGF-I) axis and this heterogeneity may result in supra physiological concentrations of IGF-I during GH treatment. The long-term effects of elevated IGF-I levels has been a matter of concern. We explored the variations in total IGF-I and bioactive IGF-I and the associations with growth and glucose metab...

Objective: Merge and standardize the scarce data on molecular and phenotypic findings of mutations in the human leptin receptor (LEPR) gene causing a rare form of severe early-onset obesity.Methods: We summarized functional and phenotypic traits of LEPR mutations reported in the literature in a structured and comprehensive manner. Additional data was obtained from 6 subjects of our outpatient clinic not reported so far. Functionality of mutations was ass...

Introduction: Congenital central hypothyroidism (CCH) is a rare disease with inappropriate thyroid hormone secretion due to impaired TSH stimulation. TSH levels are not elevated; the patients are not diagnosed in TSH-based newborn screening. Biallelic variants in TRHR gene (encoding TRH receptor) are one of four genetic defects known to cause isolated CCH (THRH, THSB, IGSF1, TBL1X). The phenotype is variable but generally mild (neon...

Background: Klinefelter syndrome (KFS) is a sex chromosomal disorder characterised by hypogonadism, progressive testicular failure, gynaecomastia and learning difficulties. Genital anomalies are rarely observed in KFS. Androgen insensitivity has been previously postulated, but not proven to cause genital ambiguity in KFS. Androgen receptor (AR) gene defects are reported in AIS, but have not been reported in children with KFS with mild hypospadias. We describe a novel ...

Background: That mortality is not increased in rhGH-treated patients when adjusting for birth characteristics was recently published (1). When applying a developed mortality model of the general population, the observed and expected deaths in rhGH-treated IGHD, ISS and SGA patients (n=3847) where 21 and 21.99, respectively. The model includes gender, age, calendar year, gestational age (GA), birth lengthSDS (BLSDS), birth weightSDS (BW...

Background: Consultations for infantile hypercalcaemia have increased at Sydney Children’s Hospital since guidelines for vitamin D3 supplementation during pregnancy were introduced in 2006. Recent nationwide shortages of low-calcium formula (LCF) suggest this problem may be widespread.Aim: To determine if infantile hypercalcaemia is occurring more commonly, identify potential aetiologies and clinical significance.Me...

Background: Loss-of-function of immunoglobulin superfamily member 1 (IGSF1) results in an X-linked syndrome of central hypothyroidism and macroorchidism, variable prolactin deficiency, GH deficiency, increased fat percentage, and delayed puberty testosterone rise despite normal timing of testicular growth.Methods: We investigated the spatial and temporal expression of IGSF1 at the protein and mRNA levels in fetal, neonatal, and adult Wistar rats, using i...