ESPE Abstracts

Background: Noonan Syndrome (NS; OMIM 163950) is a common autosomal dominant disorder distinguished by facial dysmorphism, short stature, heart defects, chest deformities, and learning disabilities or mental retardation. NS stems from heterozygous germline causative variants in genes regulating the RAS/MAPK signaling pathway, including PTPN11, SOS1, RAF1, RIT1, KRAS, NRAS, BRAF, LZTR1, and SOS2. The condition exhibits considerable clinical variability and shar...

Introduction: McCune-Albright Syndrome (MAS) is a rare congenital disorder caused by post-zygotic activating mutations in GNAS gene. Due to the mosaic pattern of this disease, mutation abundance is frequently low in several tissues, including blood cells. The emergence of next-generation sequencing (NGS) methodologies has allowed the analysis of millions of DNA fragments simultaneously and independently, enabling detection of low mutation abundance. Aim: To es...

Background: GNAS activating mutations are the genetic basis of McCune-Albright syndrome (MAS). Peripheral precocious puberty (PPP) due to functional ovarian cysts, with or without MAS features, denotes a potential GNAS -related disorder.Aim: To explore GNAS somatic mutations (p.R201C/H) in peripheral leukocyte DNA using ddPCR in girls with ovarian-origin PPP with or without MAS.<p class="ab...

Introduction: Lipodystrophy syndromes are characterized by a progressive metabolic impairment secondary to adipose tissue dysfunction and genetic background. The role of microbiota is still uninvestigated.Objective: Evaluate the gut microbiome ecology in relation to dietary and clinical parameters in two infant siblings with congenital generalized lipodystrophy type 4 (CGL4) before and after treatment with recombinant le...

Introduction: BIPSS before and after desmopressin stimulation has been shown to be a useful tool for diagnosis of ACTH-dependent CD and negative magnetic resonance imaging (MRI)or positive MRI but inconsistent biochemical data, in adult patients. However, little is known about its usefulness in pediatric population.Objective: To evaluate the prevalence of negative MRI, the sensitivity of BIPSS before and after desmopress...

Introduction: Genetic investigation in patients with short stature allows diagnostic definition and impacts therapeutic decisions, clinical follow-up, and genetic counseling. That said, next-generation sequencing has created a new clinical challenge by allowing the identification of findings unrelated to the complaint that prompted testing. The ACMG published a list of actionable incidental findings that includes genes whose variants should be reported to pati...

Brief summary: This case series of three patients with Bartter syndrome (BS) type 3 treated in Sao Paulo and Santarem, Brazil is presented to highlight the difficulties of clinical management and diagnosis. BS is an inherited disorder characterized by impaired sodium chloride reabsorption in the cortical and medullary thick ascending limbs of the loop of Henle and secondary hypokalemic alkalosis. In Brazil, genetic testing for this disease is not common. Howev...

Background: Obesity is a worldwide epidemic affecting adults and children. Social changes throughout history have contributed to modifications in nutrition and physical activity levels. These changes in lifestyle affected health, increasing the number of metabolic and cardiovascular diseases. Obese children already have a low grade systemic inflammation as well as markers of increased cardiovascular risk. The endothelial function is an important and early marker of atheroscler...

Background: Hypospadias in boys may be associated with a lack of androgen exposure during the masculinisation programming window. As testosterone has effects on the vasculature, we assessed whether boys with hypospadias show any evidence of vascular dysfunction.Methods: Excess foreskin tissue was obtained from boys undergoing hypospadias repair (cases) or circumcision (controls) and small arteries dissected from this tissue. Vascular contractility was as...

Background: Congenital GH deficiency (GHD) can be isolated (IGHD) or combined with other pituitary hormone deficiencies (CPHD). The identification of mutations has clinical implications for the management of patients and genetic counseling1.Objective: To prospectively conduct a molecular-genetic analysis in genes associated with IGHD or CPHD.Method: Forty patients with IGHD (n=8) or CPHD (n=32) were stu...