ESPE Abstracts

Background: The stimulatory G-protein α-subunit encoded by GNAS exons 1–13 (GNAS-Gsα) mediates signal transductions of multiple G-protein-coupled receptors including arginine vasopressin (AVP) receptor 2 (AVPR2). To date, various germline-derived loss-of-function variants of maternal and paternal origin have been found in pseudohypoparathyroidism type Ia and pseudopseudohypoparathyroidism respectively, and specific somatic gain...

Objectives: This trial (NCT01927861) evaluated the growth-promoting effect and safety of Norditropin® (somatropin; recombinant human growth hormone) in Japanese children with short stature due to Noonan syndrome over four years of treatment.Methods: Pre-pubertal children diagnosed with Noonan syndrome were randomized 1:1 to receive Norditropin® 0.033 mg/kg/day or 0.066 mg/kg/day. Change in...

Objectives: KLF11 is a member of the Sp1/KLF family transcription factor which contains three C2H2 zinc finger domains. To date, two KLF11 mutations (p.T220M and p.A347S) have been identified in three families clinically diagnosed with type 2 diabetes. The aim of our study is to report clinical and molecular characteristics of a KLF11 mutation-carrying family clinically diagnosed with type 1 diabetes (T1D).Methods:...

Background: Recently, eight MAP3K1 mutations have been identified in patients with 46,XY disorder of sex development (DSD), although detailed clinical findings of the mutation-positive patients remain to be investigated.Objective and hypotheses: To clarify the frequency and clinical consequences of MAP3K1 mutations.Method: Mutation screening of MAP3K1 were performed for 37 patients with 46,XY DSD. Phenoty...

Background: Silver-Russell syndrome (SRS) is a congenital developmental disorder characterised by pre- and post-natal growth failure, relative macrocephaly, hemihypotrophy, and fifth-finger clinodactyly. Recent studies have shown that gain-of-function mutations of CDKN1C result in IMAGe syndrome (IMAGeS) characterized by intrauterine growth restriction, metaphyseal dysplasia, adrenal hypoplasia congenita, and male genital abnormalities, whereas less severe gain-of-function mut...

Background: Beckwith-Wiedemann syndrome (BWS) is a representative imprinting disorder with characteristic clinical features such as overgrowth, macroglossia, and abdominal wall defects. The BWS-responsible imprinted region is on chromosome 11p15.5. The CpGs within the H19/IGF2:IG-differentially methylated region (H19 -DMR) at the 11p15.5 imprinted region are maternally unmethylated and paternally methylated, and the H19- DMR function...

Background: Vertical transfer of maternal cells to the fetus via the placenta leads to maternal microchimerism (MMc) in children. Previous studies from USA have shown that the prevalence and degree of MMc was significantly higher in patients with type 1 diabetes (T1D) than in their unaffected siblings and control individuals. To date, however, the frequency of MMc in non-Caucasian T1D patients remains to be examined.Methods</stro...

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...

Background: Heterozygous loss-of-function mutations of FGFR1 are known to cause Kallmann syndrome (KS) and isolated hypogonadotropic hypogonadism (IHH). Furthermore, recent studies have also indicated that heterozygous loss-of-function mutations lead to IHH and split hand/foot malformation (SHFM).Objective and hypotheses: The objective of this study was to examine FGFR1 in three Japanese patients with IHH and SHFM.Method: ...