يعرض 1 - 10 نتائج من 112 نتيجة بحث عن '"Azzi, Salah"', وقت الاستعلام: 1.03s تنقيح النتائج
  1. 1
    دورية أكاديمية

    المساهمون: Sorbonne Université (SU), Centre de Recherche Saint-Antoine (CRSA), Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Sorbonne Université (SU), CHU Trousseau APHP, Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU), CHU Montpellier, Centre Hospitalier Régional Universitaire Montpellier (CHRU Montpellier), Maladies génétiques d'expression pédiatrique (U933), Institut National de la Santé et de la Recherche Médicale (INSERM)-CHU Trousseau APHP, Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU), CHU Amiens-Picardie, Children's University Hospital Queen Fabiola Bruxelles, Belgium, Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté COMUE (UBFC), Centre Hospitalier Régional Universitaire de Besançon (CHRU Besançon), Centre Hospitalier Universitaire de Nantes = Nantes University Hospital (CHU Nantes), Centre Hospitalier Universitaire d'Angers (CHU Angers), PRES Université Nantes Angers Le Mans (UNAM), Centre Hospitalier de Calais, Hôpital Robert Debré Paris, Hôpital Robert Debré, Université Paris Diderot - Paris 7 (UPD7), Centre Hospitalier Métropole Savoie Chambéry, CH Bretagne Sud, Association Française des Pédiatres Endocrinologues Libéraux (AFPEL), Hôpital universitaire Robert Debré Reims (CHU Reims), AP-HP Hôpital universitaire Robert-Debré Paris, Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP), Les Hôpitaux Universitaires de Strasbourg (HUS), Laboratoire de Génétique Médicale (LGM), Université de Strasbourg (UNISTRA)-Institut National de la Santé et de la Recherche Médicale (INSERM)

    المصدر: ISSN: 0022-2593.

    الوصف: International audience ; BACKGROUND: The type 1 insulin-like growth factor receptor (IGF1R) is a keystone of fetal growth regulation by mediating the effects of IGF-I and IGF-II. Recently, a cohort of patients carrying an IGF1R defect was described, from which a clinical score was established for diagnosis. We assessed this score in a large cohort of patients with identified IGF1R defects, as no external validation was available. Furthermore, we aimed to develop a functional test to allow the classification of variants of unknown significance (VUS) in vitro.METHODS: DNA was tested for either deletions or single nucleotide variant (SNV) and the phosphorylation of downstream pathways studied after stimulation with IGF-I by western blot analysis of fibroblast of nine patients.RESULTS: We detected 21 IGF1R defects in 35 patients, including 8 deletions and 10 heterozygous, 1 homozygous and 1 compound-heterozygous SNVs. The main clinical characteristics of these patients were being born small for gestational age (90.9%), short stature (88.2%) and microcephaly (74.1%). Feeding difficulties and varying degrees of developmental delay were highly prevalent (54.5%). There were no differences in phenotypes between patients with deletions and SNVs of IGF1R. Functional studies showed that the SNVs tested were associated with decreased AKT phosphorylation.CONCLUSION: We report eight new pathogenic variants of IGF1R and an original case with a homozygous SNV. We found the recently proposed clinical score to be accurate for the diagnosis of IGF1R defects with a sensitivity of 95.2%. We developed an efficient functional test to assess the pathogenicity of SNVs, which is useful, especially for VUS.

  2. 2
    دورية أكاديمية

    المصدر: Journal of medical genetics

    الوصف: Background: The type 1 insulin-like growth factor receptor (IGF1R) is a keystone of fetal growth regulation by mediating the effects of IGF-I and IGF-II. Recently, a cohort of patients carrying an IGF1R defect was described, from which a clinical score was established for diagnosis. We assessed this score in a large cohort of patients with identified IGF1R defects, as no external validation was available. Furthermore, we aimed to develop a functional test to allow the classification of variants of unknown significance (VUS) in vitro. Methods: DNA was tested for either deletions or single nucleotide variant (SNV) and the phosphorylation of downstream pathways studied after stimulation with IGF-I by western blot analysis of fibroblast of nine patients. Results: We detected 21 IGF1R defects in 35 patients, including 8 deletions and 10 heterozygous, 1 homozygous and 1 compound-heterozygous SNVs. The main clinical characteristics of these patients were being born small for gestational age (90.9%), short stature (88.2%) and microcephaly (74.1%). Feeding difficulties and varying degrees of developmental delay were highly prevalent (54.5%). There were no differences in phenotypes between patients with deletions and SNVs of IGF1R. Functional studies showed that the SNVs tested were associated with decreased AKT phosphorylation. Conclusion: We report eight new pathogenic variants of IGF1R and an original case with a homozygous SNV. We found the recently proposed clinical score to be accurate for the diagnosis of IGF1R defects with a sensitivity of 95.2%. We developed an efficient functional test to assess the pathogenicity of SNVs, which is useful, especially for VUS. ; SCOPUS: ar.j ; info:eu-repo/semantics/published

    وصف الملف: 1 full-text file(s): application/pdf

    العلاقة: uri/info:doi/10.1136/jmedgenet-2019-106328; uri/info:pmid/31586944; uri/info:scp/85073159461; https://dipot.ulb.ac.be/dspace/bitstream/2013/297140/3/IGF1R.pdfTest; http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/297140Test

  3. 3
    دورية أكاديمية

    المساهمون: Centre de Recherche Saint-Antoine (CRSA), Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Sorbonne Université (SU), CHU Trousseau APHP, Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU), Les Hôpitaux Universitaires de Strasbourg (HUS), Hôpital Bicêtre AP-HP, Le Kremlin-Bicêtre, Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP), Icahn School of Medicine at Mount Sinai New York (MSSM)

    المصدر: ISSN: 2375-2548 ; Science Advances ; https://hal.sorbonne-universite.fr/hal-02090873Test ; Science Advances , 2019, 5 (2), pp.eaau9425. ⟨10.1126/sciadv.aau9425⟩.

    الوصف: International audience ; Imprinting disorders (IDs) often affect growth in humans, leading to diseases with overlapping features, regardless of the genomic region affected. IDs related to hypomethylation of the human 14q32.2 region and its DLK1/MEG3 domain are associated with Temple syndrome (TS14). TS14 is a rare type of growth retardation, the clinical signs of which overlap considerably with those of Silver-Russell syndrome (SRS), another ID related to IGF2 down-regulation at 11p15.5 region. We show that 14q32.2 hypomethylation affects expression, not only for genes at this locus but also for other imprinted genes, and especially lowers IGF2 levels at 11p15.5. Furthermore, expression of nonimprinted genes is also affected, some of which are also deregulated in SRS patients. These findings highlight the epigenetic regulation of gene expression at the DLK1/MEG3 domain. Expression profiling of TS14 and SRS patients highlights common signatures, which may account for the clinical overlap observed between TS14 and SRS.

  4. 4
    دورية أكاديمية

    المساهمون: FP7 People: Marie-Curie Actions, Agence Nationale de la Recherche, Institut national de la santé et de la recherche médicale, Novo Nordisk, Université Pierre et Marie Curie, Société Française d’Endocrinologie et Diabétologie Pédiatrique

    المصدر: Science Advances ; volume 5, issue 2 ; ISSN 2375-2548

    الوصف: Temple or Silver-Russell syndrome? We reveal the molecular reasons for the clinical resemblance between these two syndromes.

  5. 5
    دورية أكاديمية

    المساهمون: Centre de Recherche Saint-Antoine (CRSA), Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Sorbonne Université (SU), CHU Trousseau APHP, Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU), Centre de Physiopathologie Toulouse Purpan (CPTP), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), Centre Hospitalier Universitaire de Toulouse (CHU Toulouse), University of Washington Seattle, CHU Limoges, Hôpital Debrousse, Hospices Civils de Lyon (HCL), Icahn School of Medicine at Mount Sinai New York (MSSM)

    المصدر: ISSN: 1098-3600.

    الوصف: International audience ; Purpose: Fetal growth is a complex process involving maternal, placental and fetal factors. The etiology of fetal growth retardation remains unknown in many cases. The aim of this study is to identify novel human mutations and genes related to Silver–Russell syndrome (SRS), a syndromic form of fetal growth retardation, usually caused by epigenetic downregulation of the potent fetal growth factor IGF2.Methods: Whole-exome sequencing was carried out on members of an SRS familial case. The candidate gene from the familial case and two other genes were screened by targeted high-throughput sequencing in a large cohort of suspected SRS patients. Functional experiments were then used to link these genes into a regulatory pathway.Results: We report the first mutations of the PLAG1 gene in humans, as well as new mutations in HMGA2 and IGF2 in six sporadic and/or familial cases of SRS. We demonstrate that HMGA2 regulates IGF2 expression through PLAG1 and in a PLAG1-independent manner.Conclusion: Genetic defects of the HMGA2–PLAG1–IGF2 pathway can lead to fetal and postnatal growth restriction, highlighting the role of this oncogenic pathway in the fine regulation of physiological fetal/postnatal growth. This work defines new genetic causes of SRS, important for genetic counseling.

  6. 6
    دورية أكاديمية

    المساهمون: Centre de Recherche Saint-Antoine (CRSA), Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Sorbonne Université (SU), CHU Trousseau APHP, Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU), The Babraham Institute Cambridge, UK, CHI Poissy-Saint-Germain, Maladies génétiques d'expression pédiatrique (U933), Institut National de la Santé et de la Recherche Médicale (INSERM)-CHU Trousseau APHP, Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU), Institut du Cerveau = Paris Brain Institute (ICM), Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Institut National de la Santé et de la Recherche Médicale (INSERM)-CHU Pitié-Salpêtrière AP-HP, Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU)-Sorbonne Université (SU)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Icahn School of Medicine at Mount Sinai New York (MSSM), This work was supported by the Institut National de la Santé Et de la Recherche Médicale (INSERM),funding from the Université Pierre et Marie Curie (UPMC-Paris6), the Agence Nationale de laRecherche (ANR EPIFEGRO 2010), a Pfizer grant, and a 2010 grant from Agence de Biomédecine.WAH was supported by the People Programme (Marie Curie Actions) of the European Union's SeventhFramework Programme FP7/ITN Ingenium 2007-2013/ under REA grant agreement n° 290123 and bythe Société Française d'Endocrinologie et Diabétologie Pédiatrique with a Lilly grant.F.B was supported by Novonordisk Grant « Growth Hormone, Growth and Metabolism ».

    المصدر: ISSN: 1059-7794.

    الوصف: International audience ; The 11p15 region harbors the IGF2/H19 imprinted domain, implicated in fetal and postnatal growth. Silver-Russell syndrome (SRS) is characterized by fetal and postnatal growth failure, and is caused principally by hypomethylation of the 11p15 imprinting control region 1 (ICR1). However, the mechanisms leading to ICR1 hypomethylation remain unknown. Maternally inherited genetic defects affecting the ICR1 domain have been associated with ICR1 hypermethylation and Beckwith-Wiedemann Syndrome (an overgrowth syndrome, the clinical and molecular mirror of SRS), and paternal deletions of IGF2 enhancers have been detected in four SRS patients. However, no paternal deletions of ICR1 have ever been associated with hypomethylation of the IGF2/H19 domain in SRS. We screened for new genetic defects within the ICR1 in a cohort of 234 SRS patients with hypomethylated IGF2/H19 domain. We report deletions close to the boundaries of ICR1 on the paternal allele in one familial and two sporadic cases of SRS with ICR1 hypomethylation. These deletions are associated with hypomethylation of the remaining CBS, and decreased IGF2 expression. These results suggest that these

    العلاقة: info:eu-repo/semantics/altIdentifier/pmid/27701793; hal-04026539; https://hal.science/hal-04026539Test; https://hal.science/hal-04026539/documentTest; https://hal.science/hal-04026539/file/Habib_et_al-2016-Human_Mutation.pdfTest; PUBMED: 27701793; WOS: 000390349700013

  7. 7
    دورية أكاديمية

    المصدر: Journal of Medical Genetics ; volume 55, issue 3, page 205-213 ; ISSN 0022-2593 1468-6244

    الوصف: Background The 11p15 region contains two clusters of imprinted genes. Opposite genetic and epigenetic anomalies of this region result in two distinct growth disturbance syndromes: Beckwith-Wiedemann (BWS) and Silver-Russell syndromes (SRS). Cytogenetic rearrangements within this region represent less than 3% of SRS and BWS cases. Among these, 11p15 duplications were infrequently reported and interpretation of their pathogenic effects is complex. Objectives To report cytogenetic and methylation analyses in a cohort of patients with SRS/BWS carrying 11p15 duplications and establish genotype/phenotype correlations. Methods From a cohort of patients with SRS/BWS with an abnormal methylation profile (using ASMM-RTQ-PCR), we used SNP-arrays to identify and map the 11p15 duplications. We report 19 new patients with SRS (n=9) and BWS (n=10) carrying de novo or familial 11p15 duplications, which completely or partially span either both telomeric and centromeric domains or only one domain. Results Large duplications involving one complete domain or both domains are associated with either SRS or BWS, depending on the parental origin of the duplication. Genotype-phenotype correlation studies of partial duplications within the telomeric domain demonstrate the prominent role of IGF2 , rather than H19 , in the control of growth. Furthermore, it highlights the role of CDKN1C within the centromeric domain and suggests that the expected overexpression of KCNQ1OT1 from the paternal allele (in partial paternal duplications, excluding CDKN1C ) does not affect the expression of CDKN1C . Conclusions The phenotype associated with 11p15 duplications depends on the size, genetic content, parental inheritance and imprinting status. Identification of these rare duplications is crucial for genetic counselling.

  8. 8
    دورية أكاديمية

    المساهمون: Centre de Recherche Saint-Antoine (UMRS893), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de la Santé et de la Recherche Médicale (INSERM), CHU Trousseau APHP, Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU), Epigenetics Programme, The Babraham Institute Cambridge, UK, MAGIC Foundation, Department of Psychiatry and Biobehavioral Sciences, University of California Los Angeles (UCLA), University of California (UC)-University of California (UC), Department of Pediatrics New York, Icahn School of Medicine at Mount Sinai New York (MSSM)

    المصدر: ISSN: 0022-2593.

    مصطلحات موضوعية: [SDV.GEN]Life Sciences [q-bio]/Genetics

    الوصف: International audience ; Background Multiple clinical scoring systems have been proposed for Silver-Russell syndrome (SRS). Here we aimed to test a clinical scoring system for SRS and to analyse the correlation between (epi)genotype and phenotype. Subjects and methods Sixty-nine patients were examined by two physicians. Clinical scores were generated for all patients, with a new, six-item scoring system: (1) small for gestational age, birth length and/or weight ≤−2SDS, (2) postnatal growth retardation (height ≤−2SDS), (3) relative macrocephaly at birth, (4) body asymmetry, (5) feeding difficulties and/or body mass index (BMI) ≤−2SDS in toddlers; (6) protruding forehead at the age of 1–3 years. Subjects were considered to have likely SRS if they met at least four of these six criteria. Molecular investigations were performed blind to the clinical data. Results The 69 patients were classified into two groups (Likely-SRS (n=60), Unlikely-SRS (n=9)). Forty-six Likely-SRS patients (76.7%) displayed either 11p15 ICR1 hypomethylation (n=35; 58.3%) or maternal UPD of chromosome 7 (mUPD7) (n=11; 18.3%). Eight Unlikely-SRS patients had neither ICR1 hypomethylation nor mUPD7, whereas one patient had mUPD7. The clinical score and molecular results yielded four groups that differed significantly overall and for individual scoring system factors. Further molecular screening led identifying chromosomal abnormalities in Likely-SRS-double-negative and Unlikely-SRS groups. Four Likely-SRS-double negative patients carried a DLK1/GTL2 IG-DMR hypomethylation, a mUPD16; a mUPD20 and a de novo 1q21 microdeletion. Conclusions This new scoring system is very sensitive (98%) for the detection of patients with SRS with demonstrated molecular abnormalities. Given its clinical and molecular heterogeneity, SRS could be considered as a spectrum.

  9. 9
    دورية أكاديمية
  10. 10
    دورية أكاديمية