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54th Annual ESPE

Barcelona, Spain
01 Oct 2015 - 03 Oct 2015

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Barcelona, Spain; 1-3 October 2015 Further information

Free Communications

Bone & Mineral Metabolism

hrp0084fc2.1 | Bone & Mineral Metabolism | ESPE2015

Whole Exome Sequencing Analysis of Patients with Autosomal Recessive Hypophophatemic Rickets Identified Mutations in DMP1, ENPP1 and SLC34A3

Li Dong , Tenenbaum-Rakover Yardena , Tian Lifeng , Hou Cuiping , Kim Cecilia , Hakonarson Hakon , Levine Michael

Background: Hypophosphatemic rickets (HR) is most commonly X-linked or autosomal dominant, but autosomal recessive (AR) forms have been described. ARHR1 (DMP1) and ARHR2 (ENPP1) share identical biochemical characteristics of excessive renal phosphate wasting due to increased circulating levels of the phosphatonin FGF23 and low serum levels of 1,25(OH)2D. By contrast, in hereditary hypophosphatemic rickets with hypercalciuria (HHRH) phosphaturia is ...

hrp0084fc2.2 | Bone & Mineral Metabolism | ESPE2015

Identification of Mutations in TBX1 and AIRE in Isolated Hypoparathyroidism Patients

Li Dong , Schnellbacher Sarah , Tian Lifeng , Hou Cuiping , Kim Cecilia , Hakonarson Hakon , Levine Michael

Background: Hypoparathyroidism may manifest either as an isolated disorder or as a component of a more complex syndrome. Molecular genetic studies indicate that mutations in PTH, CASR, GCM2 and GNA11 are causes of isolated hypoparathyroidism (IH) and mutations in GATA3, TBCE, FAM111A, AIRE and TBX1 are associated with different complex syndromes with hypoparathyroidism.Objec...

hrp0084fc2.3 | Bone & Mineral Metabolism | ESPE2015

High Success of a Next Generation Sequencing Panel for the Molecular Diagnosis of Rare Skeletal Dysplasias

Barreza Jimena , Rivera-Pedroza Carlos I , Sentchordi-Montane Lucia , Vallespin Elena , Montano Victoria E F , Mansilla Elena , Belinchon Alberta , Benito-Sanz Sara , del Pozo Angela , Ibanez Kristina , Gonzalez-Casado Isabel , Guillen-Navarro Encarna , Prieto Pablo , del Pozo Jaime Sanchez , Cruz-Rojo Jaime , Galan Enrique , Lapunzina Pablo , Garcia-Minaur Sixto , Santos-Simarro Fernando , Heath Karen E

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...

hrp0084fc2.4 | Bone & Mineral Metabolism | ESPE2015

Asfotase Alfa: Sustained Efficacy and Tolerability in Children with Hypophosphatasia Treated for 5 Years

Madson Katherine L , Rockman-Greenberg Cheryl , Moseley Scott , Odrljin Tatjana , Whyte Michael P

Background: Hypophosphatasia (HPP) is the rare inherited metabolic disorder resulting from loss-of-function mutation(s) in the tissue-nonspecific alkaline phosphatase (TNSALP) gene. TNSALP deficiency can cause a spectrum of complications in children including premature deciduous tooth loss, rickets, poor growth, and compromised physical function. We previously reported that children, 5–12 years old, with HPP and treated with asfotase alfa, a recombinant bone-targeted huma...

hrp0084fc2.5 | Bone & Mineral Metabolism | ESPE2015

Methyl Donor Deficiency Impairs Differentiation of Pre-Osteoblasts Through Disruption of Functional Interaction Between Peroxisome Proliferator-Activated Receptor-Gamma Coactivator-1 Alpha and Vitamin D Receptor

Feigerlova Eva , Ghemrawi Rose , Melhelm Hassan , Battaglia-Hsu Shyuefang , Demarquet Lea , Weryha Georges , Rodriguez-Gueant Rosa-Maria , Gueant Jean-Louis

Background: Folate and cobalamin are needed for synthesis of methionine, a substrate of methylation in epigenetic, and epigenomic pathways. Methyl donor deficiency (MDD) leads to hyperhomocysteinemia, which has been related to osteoporosis in humans and disruption of epiphyseal cartilage and bone development in rodents. Recent studies have revealed evidence for association between 25(OH)D3 and homocysteine levels, however, underlying mechanisms remain elusive.<p...

hrp0084fc2.6 | Bone &amp; Mineral Metabolism | ESPE2015

A Contextual Feature-Based Recognition Approach to Quantify Trabecular Microstructure Using 1.5T Axial-MRI: An Innovative Methodology

Dimitri Paul , Lekadir Karim , Hoogendoorn Corne , Armitage Paul , Whitby Elspeth , King David , Eastell Richard , Frangi Alejandro

Background: In-vivo skeletal MRI imaging remains challenging due to the extremely short MR relaxation times (<1 ms) of protons bound to water in bone. However, each MRI sequence contains properties identifiable through feature-based recognition, highlighting characteristics relating to skeletal configuration. We thus present a novel statistical method for clinical 1.5 Tesla (T) MRI in quantifying trabecular microstructure and use HRpQCT to determine its accuracy.<...