ESPE Abstracts

Introduction: Wolfram syndrome (WS) is a rare autosomal recessive disorder characterized by the association of early-onset, insulin-dependent diabetes mellitus (DM), diabetes insipidus, deafness, and progressive optic atrophy. The disease is caused by mutations of wfs1 located on 4p16 encoding peptide that is called wolframin. Wolframin is a component of the endoplasmic reticulum (ER) membrane. It is considered that mutant Wolframin might cause increased misfolded and...

Background: Aldosterone synthase deficiency (ASD) is a rare autosomal recessive disease, presenting with salt wasting and failure to thrive in early infancy. It is caused by inactivating mutations of the CYP11B2 gene.Objective and hypotheses: Our objective was to describe a Japanese patient with ASD, who presented with failure to thrive and salt wasting.Method: We present a case report and investigate molecular analysis of CYP11B2 ...

Abnormal expression of imprinted genes leads to imprinting disorders (IDs). Silver-Russell syndrome (SRS) and Prader-Willi syndrome (PWS) are representative IDs showing small for gestational age and short stature (SGA-SS).Temple syndrome (TS14) caused by abnormal gene expression at the 14q32.2 imprinted region, maternal uniparental disomy of chromosome 6 (UPD(6)mat), 16 (UPD(16)mat), and 20 (UPD(20)mat) are also associated with SGA-SS. Fuethermore, some copy number variations ...

Background: While hemizygous NR0B1 (DAX1) mutations usually lead to adrenal crisis during infancy or early childhood, p.Gln37*, p.Trp39*, and some other mutations result in late-onset or latent adrenal insufficiency. A small percentage of boys with NR0B1 mutations develops precocious puberty in addition to adrenal insufficiency.Objective and hypotheses: To report a boy with an NR0B1 mutation who exhibited central precocious puberty without adren...

Cytochrome P450 oxidoreductase deficiency (PORD) is a disorder of steroidogenesis that causes various symptoms such as skeletal malformations, disorders of sex development, and adrenal insufficiency. The aim of this study was to elucidate the clinical characteristics, especially age at diagnosis and treatment, of PORD from the perinatal period to adulthood in Japan. The first questionnaire was sent to 183 council members of the Japanese Society for Pediatric Endocrinology on 1...

Background: Maternal uniparental disomy of chromosome 16 (UPD(16)mat) is defined as the presence of two homologous chromosomes 16 inherited from only the mother. To our knowledge, 49 live-born UPD(16)mat patients without chromosomal abnormalities other than that in chromosome 16 have been reported. UPD(16)mat patients presented with non-specific clinical features such as preterm birth, growth retardation, congenital heart diseases (CHDs) and hypospadias. Silver-Russell syndrom...

Background: Silver-Russell syndrome (SRS) is a rare congenital developmental disorder characterised by pre- and postnatal growth failure, relative macrocephaly, triangular face, hemihypotrophy, and fifth finger clinodactyly. Hypomethylation of the H19-DMR and maternal uniparental disomy chromosome 7 (UPD(7)mat) were identified in about 30 and 10% of SRS patients respectively. Genetic causes of the remaining 60% of the patients are unknown. Growth failure, small hands, and hypo...

Background: In initial treatment of DKA, volume expansion should begin with 0.9% saline to restore the peripheral circulation. The use of large amounts of chloride-rich/bicarbonate-free fluids may cause the rapid development of hyperchloremic metabolic acidosis, which is described in ISPAD Clinical Practice Consensus Guidelines 2018.The severity of DKA, defined by pH, HCO3- Base Excess (BE), is one of the factor...

Context: Maternal uniparental disomy for chromosome 20 (UPD(20)mat) resulting in aberrant expression of imprinted transcripts at the GNAS locus is a poorly characterized condition. Only 10 non-mosaic cases have been studied clinically. These patients presented with pre- and post-natal growth failure and feeding difficulties. The phenotype of these cases overlapped with that of Silver-Russell syndrome (SRS) and small for gestational age-short stature (SGA-SS); however, the etio...

Achondroplasia (Ach) is a skeletal disorder caused by gain-of-function mutations of FGFR3. Ach patients suffer from various complications such as short stature, foramen magnum stenosis and sleep apnea. Disease-specific treatment is not available at present, although some drugs including a C-type natriuretic peptide analogue have been developed. The mutated FGFR3, G380R, has an elevated activity of the receptor-associated tyrosine kinase, but G380R is further activated...