Pediatric Endocrine Unit
Pediatric Endocrine Unit
Guillot L.,French Institute of Health and Medical Research |
Carre A.,University of Paris Descartes |
Szinnai G.,University of Basel |
Castanet M.,University of Paris Descartes |
And 10 more authors.
Human Mutation | Year: 2010
NKX2-1 (NK2 homeobox 1) is a critical regulator of transcription for the surfactant protein (SP)-B and -C genes (SFTPB and SFTPC, respectively). We identified and functionally characterized two new de novo NKX2-1 mutations c.493C>T (p.R165W) and c.786-787del2 (p.L263fs) in infants with closely similar severe interstitial lung disease (ILD), hypotonia, and congenital hypothyroidism. Functional analyses using A549 and HeLa cells revealed that NKX2-1-p.L263fs induced neither SFTPB nor SFTPC promoter activation and had a dominant negative effect on wild-type (WT) NKX2-1. In contrast, NKX2-1-p.R165W activated SFTPC, to a significantly greater extent than did WT NKX2-1, while SFTPB activation was only significantly reduced in HeLa cells. In accordance with our in vitro data, we found decreased amounts of SP-B and SP-C by western blot in bronchoalveolar lavage fluid (patient with p.L263fs) and features of altered surfactant protein metabolism on lung histology (patient with NKX2-1-p.R165W). In conclusion, ILD in patients with NKX2-1 mutations was associated with altered surfactant protein metabolism, and both gain and loss of function of the mutated NKX2-1 genes on surfactant protein promoters were associated with ILD in "Brain-Lung-Thyroid syndrome". © 2009 Wiley-Liss, Inc.
PubMed | Helen Schneider Hospital for Women, Armon Child Center, Pediatric Endocrine Unit, Endocrinology and 6 more.
Type: Journal Article | Journal: Hormone and metabolic research = Hormon- und Stoffwechselforschung = Hormones et metabolisme | Year: 2015
Nonclassical 21-hydroxylase deficiency (NC21OHD) manifests with various degrees of post natal virilization. The length of CAG repeats of the androgen receptor gene (AR) is inversely correlated to activity of the human androgen receptor (AR) and affects phenotype of several androgen-dependent disorders. The aim of the study was to investigate the associations between CAG repeat length and the phenotype of females with NC21OHD. CAG repeat length and AR inactivation were assessed in females with NC21OHD, and related to their clinical presentation. CAG repeat length and AR inactivation were assessed in 119 females with NC21OHD. Biallelic mean (BAM) of the CAG repeat length and the weighted BAM (WBAM) were related to various clinical parameters. Age at diagnosis and age of menarche positively correlated with BAM (r=0.22, p=0.02, and r=0.23, p=0.01, respectively). A shorter (<25) BAM was associated with younger age at diagnosis (14.8 vs. 21.4 years, p<0.01), at adrenarche (8.1 vs. 10.2 years, p<0.01) and gonadarche (9.9 vs. 11.2 years, p<0.01), and higher corrected height standard deviation score at diagnosis (0.77 vs. 0.15, p=0.01). Precocious pubarche and precocious puberty were more frequent in these with the shorter BAM. Results of WBAM were similar. The CAG repeat length of the AR gene contributes to the clinical diversity of the phenotype in females with NC21OHD.
Eyal O.,DANA DWEK Childrens Hospital |
Tenenbaum-Rakover Y.,Pediatric Endocrine Unit |
Shalitin S.,Shafer Institute for Endocrinology and Diabetes |
Israel S.,Hadassah University Hospital |
Weintrob N.,DANA DWEK Childrens Hospital
Acta Paediatrica, International Journal of Paediatrics | Year: 2013
Aim To determine whether nonclassical 21-hydroxylase deficiency (NC21OHD) compromises adult height (AH), and to establish the clinical parameters affecting AH in subjects with NC21OHD. Methods This is a multicenter, retrospective review of medical records for clinical and biochemical parameters. The corrected height (CH) standard deviation score (SDS), defined as AH SDS minus mean parental height (MPH) SDS, was calculated for each patient, where MPH SDS is the average of the father's height SDS and the mother's height SDS. Results The study group consisted of 122 NC21OHD subjects whose median age at diagnosis was 8.7 years (range, 0.1-36). Seventy-two patients had two mild mutations, 22 had one mild and one severe mutation, 10 were heterozygous for one mild mutation, and 18 did not undergo molecular analysis. The CH SDS of the 66 patients who initiated hydrocortisone treatment during childhood was significantly lower than those who presented after achieving AH (p = 0.03). However, there was a negative correlation between age at diagnosis and AH SDS in the former group (R = -0.7, p = 0.03). Being heterozygous for one mild and one severe mutation (R = -0.7, p < 0.02) and age at diagnosis (R = -0.7, p = 0.03) were negatively associated with CH SDS. The CH SDS was significantly lower in those who had bone age advancement at diagnosis compared to those who did not (p = 0.04). Conclusion The main determinants of AH in patients with NC21OHD are apparently age at diagnosis and initiation of therapy, and genotype. Early diagnosis and initiation of glucocorticoids therapy may improve height outcome in those presenting during childhood. ©2013 The Author(s)/Acta Pædiatrica ©2013 Foundation Acta Pædiatrica.
PubMed | Hebrew University of Jerusalem, University of Washington, Pediatric Endocrine Unit, Toldot Genetics Ltd. and 4 more.
Type: Case Reports | Journal: Journal of medical genetics | Year: 2015
Primary gonadal failure is characterised by primary amenorrhoea or early menopause in females, and oligospermia or azoospermia in males. Variants of the minichromosome maintenance complex component 8 gene (MCM8) have recently been shown to be significantly associated with womens menopausal age in genome-wide association studies. Furthermore, MCM8-knockout mice are sterile. The objective of this study was to elucidate the genetic aetiology of gonadal failure in two consanguineous families presenting as primary amenorrhoea in the females and as small testes and azoospermia in a male.Using whole exome sequencing, we identified two novel homozygous mutations in the MCM8 gene: a splice (c.1954-1G>A) and a frameshift (c.1469-1470insTA). In each consanguineous family the mutation segregated with the disease and both mutations were absent in 100 ethnically matched controls. The splice mutation led to lack of the wild-type transcript and three different aberrant transcripts predicted to result in either truncated or significantly shorter proteins. Quantitative analysis of the aberrantly spliced transcripts showed a significant decrease in total MCM8 message in affected homozygotes for the mutation, and an intermediate decrease in heterozygous family members. Chromosomal breakage following exposure to mitomcyin C was significantly increased in cells from homozygous individuals for c.1954-1G>A, as well as c.1469-1470insTA.MCM8, a component of the pre-replication complex, is crucial for gonadal development and maintenance in humans-both males and females. These findings provide new insights into the genetic disorders of infertility and premature menopause in women.
Tenenbaum-Rakover Y.,Pediatric Endocrine Unit |
Tenenbaum-Rakover Y.,Technion - Israel Institute of Technology |
Sobrier M.-L.,University Pierre and Marie Curie |
Amselem S.,University Pierre and Marie Curie
Clinical Endocrinology | Year: 2011
Summary Context POU1F1 encodes a pituitary-specific homeodomain transcription factor that is crucial for development and differentiation of anterior pituitary cell types producing GH, TSH and PRL. Although the first mutations in humans were reported in 1992, to date, less than 25 different mutations of POU1F1 have been identified worldwide. Objectives To describe the long-term follow-up of a 22-year-old male of Israeli Arab Muslim origin, born to a consanguineous union, with congenital hypothyroidism, who presented with life-threatening hypoglycaemic episodes and severe growth retardation from infancy. To identify the molecular basis of this severe disease. Main Outcome Measures Endocrine investigations, neuroimaging, sequencing of POU1F1 and assessment of the identified mutated POU1F1's ability to transactivate three specific targets (POU1F1, TSHβ and PRL). Results Central hypothyroidism was diagnosed at the age of 2 months and GH and PRL deficiencies were documented at 9 months. MRI at 14 years revealed a hypoplastic adenohypophysis. The patient underwent spontaneous but delayed puberty. A novel disease-causing mutation (c.502insT) was identified in the homozygous state in exon 4 of POU1F1. This insertion results in a frameshift introducing an early termination codon at position 174 (p.Thr168IlefsX7), leading to a severely truncated protein lacking the entire homeodomain. This mutation abolishes POU1F1's transactivation properties on three target promoters. Conclusion This study, which identifies a novel loss-of-function mutation in POU1F1, describes the phenotype of a rare condition in a patient followed from the first weeks of life to adulthood. The severity of the central hypothyroidism should alert clinicians to assess other pituitary axes, in particular GH and prolactin. © 2011 Blackwell Publishing Ltd.
Massart F.,University of Pisa |
Massart F.,Pediatric Endocrine Unit |
Saggese G.,University of Pisa
Sexual Development | Year: 2010
Although important advances in testicular physiology have been achieved, the aetiology of human cryptorchidism remains mostly unknown. Next to sex steroidal signaling pathways, morphogenetic genes are specifically involved in the testicular descent via gubernacular development. Mutations in the human genes encoding insulin-like factor 3 (INSL3) and its Leu-rich repeat-containing G protein-coupled receptor 8 (LGR8), homeobox A10 (HOXA10), zinc finger 214 (ZNF214) and 215 (ZNF215) have occasionally been identified but do not seem to be a frequent cause of cryptorchidism. On the other hand, common polymorphisms in these genes have recently been investigated as contributing risk factors for idiopathic isolated (nonsyndromic) cryptorchidism. Copyright © 2010 S. Karger AG, Basel.
Zadik Z.,Hebrew University of Jerusalem |
Sinai T.,Hebrew University of Jerusalem |
Zung A.,Pediatric Endocrine Unit |
Golander A.,Pediatric Endocrine Unit |
Reifen R.,Hebrew University of Jerusalem
Journal of Pediatric Endocrinology and Metabolism | Year: 2010
Objective: To assess the effect of nutritional supplementation on growth in short children born small for gestational age (SGA). Patients: Fifty four short but otherwise healthy children (26 boys), 6.4±1.8 years of age, were referred for growth retardation. Methods: Following a 6 month observation period the participants were randomly allocated to receive growth hormone therapy (GH) 1.26 IU/kg/day (0.042 mg/kg/day) or nutritional program (NUT) or passive observation (OBS). Patients in the nutritional program received 10 mg/day iron, 11 mg zinc-three times a week and 10000 IU/week of vitamin A. The following parameters were obtained 3 monthly: height, weight, dietary intake and serum IGF-1. Results: Six months of nutritional supplement induced growth acceleration somewhat lower than that seen in the growth hormone treated children, but significantly greater than noted in the observation group (OBS 4.6±1.3, NUT 7.9±1.7, GH 9.1±1.8 cm/yr, P<0.001). Conclusions: Six months of vitamin A, iron and zinc supplementation induces growth acceleration in short children born SGA with subnormal nutrients intake similar to growth hormone therapy. © Freund Publishing House Ltd.
Shacham E.C.,Institute of Endocrinology |
Ishay A.,Institute of Endocrinology |
Ishay A.,Technion - Israel Institute of Technology |
Irit E.,ek Medical Center |
And 3 more authors.
Thyroid | Year: 2012
Background: The occurrence of thyroid carcinoma in patients with congenital hypothyroidism (CH) caused by dyshormonogenesis is very rare, and has only been reported in one patient harboring mutations in the thyroid peroxidase (TPO) gene. Patient Findings: We report on a 29-year follow-up of two consanguineous siblings with CH due to total iodide organification defect who also had sensorineural hearing loss. Molecular analysis revealed a novel biallelic mutation of the TPO gene in which phenylalanine substitutes serine at codon 292 (c.875C>T, p.S292F) in exon 8. Despite early initiation, adequate doses of levothyroxine treatment and consequently normal thyrotropin (TSH) levels, the proposita developed a huge multinodular goiter (MNG) and underwent total thyroidectomy due to tracheal compression. Pathological examination revealed a unifocal follicular thyroid carcinoma without vascular invasion in the left lobe of the thyroid gland. Summary: Our finding of follicular thyroid carcinoma arising from dyshormonogenetic MNG in a patient without elevated serum TSH levels indicates that genetic and environmental factors other than TSH level might be involved in the development of thyroid carcinoma in dyshormonogenetic MNG. Conclusions: Despite the rare occurrence of thyroid carcinoma in dyshormonogenetic MNG, we recommend long-term follow-up and regular neck ultrasound imaging to prevent delayed diagnosis of thyroid carcinoma. © Copyright 2012, Mary Ann Liebert, Inc.
Kousta E.,P And A Kyriakou Childrens Hospital |
Papathanasiou A.,P And A Kyriakou Childrens Hospital |
Skordis N.,Pediatric Endocrine Unit
Hormones | Year: 2010
There have been considerable advances concerning understanding of the early and later stages of ovarian development; a number of genes have been implicated and their mutations have been associated with developmental abnormalities. The most important genes controlling the initial phase of gonadal development, identical in females and males, are Wilms' tumor suppressor 1 (WT1) and steroidogenic factor 1 (SF1). Four genes are likely to be involved in the subsequent stages of ovarian development (WNT4, DAX1, FOXL2 and RSPO1), but none is yet proven to be the ovarian determining factor. changes in nomenclature and classification were recently proposed in order to incorporate genetic advances and substitute gender-based diagnostic labels in terminology. The term "disorders of sex development" (DsD) is proposed to substitute the previous term "intersex disorders". Three main categories have been used to describe DsD in the 46,XX individual: 1) disorders of gonadal (ovarian) development: ovotesticular DsD, previously named true hermaphroditism, testicular DsD, previously named XX males, and gonadal dysgenesis; 2) disorders related to androgen excess (congenital adrenal hyperplasia, aromatase deficiency and P450 oxidoreductase deficiency); and 3) other rare disorders. In this mini-review, recent advances concerning development of the genital system in 46,XX individuals and related abnormalities are discussed. basic embryology of the ovary and molecular pathways determining ovarian development are reviewed, focusing on mutations disrupting normal ovarian development. Disorders of sex development according to the revised nomenclature and classification in 46,XX individuals are summarized, including genetic progress in the field.
Sriphrapradang C.,University of Chicago |
Tenenbaum-Rakover Y.,Pediatric Endocrine Unit |
Weiss M.,University of Chicago |
Barkoff M.S.,University of Chicago |
And 5 more authors.
Journal of Clinical Endocrinology and Metabolism | Year: 2011
Context: TSH receptor (TSHR) and thyroid peroxidase (TPO) gene mutations occur independently. This is the first report of their coexistence in the same individuals. Objectives: The objective of the study was to evaluate the genotype-phenotype correlations when mutations in both genes are present alone or together in the same individual. Patients and Methods: Thirty subjects from an extended Arab kindred underwent clinical investigation and molecular studies of the mutant TSHRs. Results: A novel mutant TSHR was identified, involving four nucleotides at three sites on the same allele, c.267G>T (L89L), c.269/270AG>CT (Q90P), and c.790C>T (P264S). In addition, two known TPO gene mutations, G493S and R540X, were identified. Thirteen heterozygotes for the mutant TSHR allele had mild hyperthyrotropinemia. In nine of theses, the coexistence of a TPO mutation in one allele did not magnify the hyperthyrotropinemia. Homozygotes for the mutant TSHR and a compound heterozygote for the TPO mutations presented frank hypothyroidism. In vitro studies showed increasing loss of function for Q90P less than P264S less than Q90P/P264S TSHR mutants, the latter being that expressed in the subjects under investigation. The two interchangeably used WT TSHR vectors, L87 and V87, although functionally identical, differed in structure and function in the presence of the Q90P mutation. Conclusions: TSHR and TPO gene mutations were identified alone and together in individuals of a consanguineous kindred. Homozygotes for the TSHR and a compound heterozygote for the TPO mutations were hypothyroid. The mild hyperthyrotropinemia of heterozygotes for the mutant TSHR allele was not aggravated by the coexistence of a TPO defect in one allele. Copyright © 2011 by The Endocrine Society.