ESPE Abstracts

Human growth is a complex trait. A considerable number of gene defects have been shown to cause short stature, but there are only few examples of genetic causes of non-syndromic tall stature. Besides rare variants with large effects and common risk alleles with small effect size, oligogenic effects may contribute to this phenotype. Exome sequencing was carried out in a tall male (height 3.5 SDS) and his parents. Filtered damaging variants with high CADD scores were validated b...

Background: The steroidogenic Factor 1 (SF1, NR5A1) is one of the key factors involved in gonadal and adrenal development and steroidogenesis. Until now, over 50 mutations were described in different phenotypes of XY disorders of sex development (DSD) such as complete gonadal dysgenesis, severe and mild partial gonadal dysgenesis, hypospadias, infertility and bilateral anorchia. So far, no genotype-phenotype correlation could be demonstrated.Objective an...

Background: Low birth weight, unfavourable intrauterine conditions, and post-natal catch-up growth are associated with a subsequent impact on growth, pubertal development, and metabolic disturbances later in life. Although the start of puberty is genetically determined it might be altered due to environmental influences.Objectives: In a longitudinal study (birth to final height) we observed growth and pubertal development of genetically identical twins b...

Background: 49,XY gonadal dysgenesis (GD) is a very rare disorder of testes development with an incidence of 1:50–100 000. MAP3K1 is a MAPK that mainly regulates the MAPK pathways. High Map3k1 expression was found in female and male mice gonads at 13.5 dpc. In 2010, MAP3K1 mutations were identified in two families with complete and partial XY GD and in two unrelated sporadic cases with complete XY GD (Pearlman 2010 AJMG). Recently, four additional mutations (four out of 4...

Background: Central hypothyroidism is rare in children. It is often part of multiple pituitary hormone deficiency but can occur in isolation. Isolated central hypothyroidism may be due to mutations in TSHB, TRHR or IGSF1, involved in TRH signalling. We present an adolescent with a novel truncating variant of IGSF1, resulting in delayed puberty, central hypothyroidism and macroorchidism.Case presentation: A 15-year-old ma...

Resistance to thyroid hormone mediated by defective TRβ (RTHβ) or TRα(RTHα).Separate genes (THRA, THRB) undergo alternate splicing, generating nuclear receptors (TRα1, TRβ1, TRβ2) with distinct tissue distributions, which mediate thyroid hormone action; the function of a non-hormone binding protein (α 2), derived from the THRA locus, is unknown.RTHβ a dominantl...

Background: A subset of central obese but normal weight individuals has been identified, who harbor potentially increased risks for development of MS despite a normal BMI.Objective and hypotheses: We try to evaluate metabolic syndrome (MS) components of normal weight central obese adolescents in Korea stratified by waist-to-height ratio (WHR).Method: This is a cross-sectional study. Data were obtained from the Korean National Healt...

Background: Congenital hypothyroidism (CH) is the most common endocrine disorder in neonates and is predominantly caused by developmental abnormalities known as thyroid dysgenesis (TD). Several transcription factors have been described in its aetiology, but defects in the known genes only account for a small proportion of cases.Methods: To identify novel genes involved in TD, we performed exome sequencing in 7 unrelated ...

Background: 17 hydroxylase deficiency is a rare form of congenital adrenal hyperplasia resulting from loss-of-function mutations involving the CYP17 gene. It is characterized by decreased production of glucocorticoids and sex steroids and increased synthesis of mineralocorticoid precursors.Objective and hypotheses: We aimed to identify genetic cause of lack of puberty in a girl and the cause of ambiguous genitalia in her sibling. Fourteen-year-o...

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