ESPE Abstracts

Background: Expression of SHOX, a transcription factor implicated in skeletal development, is regulated by the interaction of two promoters, weak, P1 (exon 1) and strong, P2 (exon 2), with at least, seven enhancers. SHOX haploinsufficiency, due to mutations in SHOX or its enhancers, explains ~70% of Leri-Weill dyschondrosteosis (LWD) and ~2.5% idiopathic short stature (ISS) cases whilst the underlying molecular mechanism in the remaining is unknown.<p...

Background: SHOX, located on the pseudoautosomal region 1 (PAR1), encodes a transcriptional factor implicated in human skeletal growth. Alterations in SHOX or its regulatory elements are observed in ~70% of patients with Leri–Weill dyschondrosteosis (LWD), in ~90% with Langer mesomelic dysplasia (LMD) and ~2.5% of patients with idiopathic short stature (ISS). SHOX deletions/duplications are a frequent alteration, with the majority encompassing the entire gene.<p class...

Background: SHOX encodes a transcription factor implicated in skeletal development. Approximately 70% and ~2.5% of Leri-Weill dyschondrosteosis (LWD) and idiopathic short stature (ISS) patients, respectively, have a defect in SHOX or its regulatory regions.Objective and hypotheses: i) To perform SHOX mutation screening in a cohort of 585 patients referred with a clinical suspicion of LWD or ISS. ii) To determine which is the <e...

Background: Homozygous natriuretic peptide receptor-2 (NPR2) mutations cause acromesomelic dysplasia, type Maroteaux, a skeletal dysplasia with extreme disproportionate short stature and recently, heterozygous NPR2 mutations have been identified also in patients with idiopathic short stature (ISS, 2–6%). SHOX mutations are found in ~2–5% of ISS cases and ~70% of Léri-Weill dyschondrosteosis (LWD) cases, characterized by disproportionat...

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.<...

Background: A total of 456 skeletal dysplasias have been classified by molecular, biochemical and/or radiological criteria, into 40 groups. Despite this, the precise, final diagnosis is often difficult due to the high phenotypic and genotypic variability.Objective: To improve the molecular and clinical diagnosis of skeletal dysplasias using a custom-designed next-generation sequencing (NGS) panel.Method: A total of 56 skeletal dysp...