ESPE Abstracts

Background: Noonan syndrome (NS) is a rare genetic disease characterized by facial dysmorphism, short stature, heart defects, chest deformities, and variable developmental delay/learning disabilities. Almost 80% of patients have a mutation in the genes encoding components of the RAS/MAPK pathway. Puberty was described as delayed in NS patients, but few studies are focusing on this subject and genotype-phenotype correlations so far.<s...

Objective: To evaluate the response to recombinant human GH (rhGH) treatment in NS children with short stature and previously identified mutations in the RAS/MAPK pathway genes.Methods: 23 patients with NS (17 males; 19 PTPN11, 3 RAF1 e 1 SHOC2) were daily treated with rhGH (mean rhGH dose of 47 μg/kg per day). The main outcome measures were 1st year growth velocity, change in height SDS (Noonan syndrome specifi...

Background: Disproportional short stature (DSS) is the most frequent clinical presentation of skeletal dysplasias, which are a heterogeneous group of more than 450 disorders of bone. Skeletal survey is important to establish the diagnosis and to guide the genetic test, but has several limitations, especially in mild and atypical cases.Objective and hypotheses: To identify the genetic aetiology of DSS by exome sequencing.Method: Who...

Objectives: Mutations in PTPN11 are known to be associated with Noonan syndrome (NS), accounting for approximately 50% of cases. Data from a non-interventional and phase 3 study of Norditropin (somatropin; Novo Nordisk A/S, Denmark) were used to assess the impact of PTPN11 mutation status on growth outcomes in children with NS receiving growth hormone therapy (GHT).Methods: The ANSWER (NCT01009905) prog...

Background: The aetiology of congenital hypopituitarism (CH) is unknown in the majority of patients. In our cohort of 200 cases, it was possible to establish the genetic cause in only 13 patients (6.5%). Copy number variants (CNVs) have been implicated as the cause of genetic syndromes with previously unknown aetiology.Objective: To study the presence of CNVs and its relevance in patients with CH of unknown cause associated with complex phenotypes.<p...

Background: Hypopituitarism is characterized by deficiency of one or more anterior pituitary hormones. POU1F1 mutations are the second most frequent known cause of combined pituitary hormone deficiency (CPHD). Patients are typically deficient in GH, TSH, and prolactin, although two unrelated cases were reported with isolated GH deficiency (IGHD). To date, all POU1F1 mutations have been reported for the predominantly expressed alpha isoform, which is a transcr...

Background: The etiology of short stature is heterogeneous, often encompassing complex genetic disorders of difficult diagnosis. Analysis of chromosomic copy number variants (CNVs) has been demonstrating the important role of these genomic imbalances in population diversity and human disease.Objective and hypotheses: To analyze the frequency and describe novel submicroscopic chromosomal CNVs in a group of patients with short stature of unknown cause....

Introduction: Noonan syndrome (NS) is a relative frequent genetic disorder, mainly characterized by dysmorphic face features, congenital heart defects and short stature. Though delayed pubertal development has been described in both sexes, the physiopathological root remains unclear. This study aims at characterizing puberty development in Noonan syndrome.Materials and Methods: The study population included 111 individuals with a molecul...

Children with ISS vary in their response to GHT. We conducted a post hoc analysis to identify clinical characteristics associated with very good or poor response during year 1 of GHT in a subset of 1550 GH naïve children with ISS from NordiNet® IOS (NCT00960128) and the ANSWER Program (NCT01009905). We included patients aged 3–11 years (males) or 3–10 years (females) at treatment start, prepubertal throughout year 1 of treatment, with height SDS...

Background: Mutations in SHOX or its regulatory regions have been detected in ~70% of Léri-Weill dyschondrosteosis (LWD) and ~2.5% of idiopathic short stature (ISS) cases, suggesting the implication of other genes or loci. Recent studies have identified NPR2 defects in ISS patients.Objective and hypotheses: To investigate if NPR2 mutations can account for a proportion of the cases referred for LWD and ISS in whom no SHOX/PAR1 mutation was detected.<...