Laboratoire Of Biochimie Et Of Genetique Moleculaire

Paris, France

Laboratoire Of Biochimie Et Of Genetique Moleculaire

Paris, France
Time filter
Source Type

Sarfati J.,University of Paris Descartes | Guiochon-Mantel A.,University Paris - Sud | Rondard P.,Universites Of Montpellier 1 | Arnulf I.,Institute National Of La Sante Et Of La Recherche Medicale Unite Mixte Of Recherche 975 | And 29 more authors.
Journal of Clinical Endocrinology and Metabolism | Year: 2010

Context: Both biallelic and monoallelic mutations in PROK2 or PROKR2 have been found in Kallmann syndrome (KS). Objective: The objective of the study was to compare the phenotypes of KS patients harboring monoallelic and biallelic mutations in these genes. Design and Patients: We studied clinical and endocrine features that reflect the functioning of the pituitary-gonadal axis, and the nonreproductive phenotype, in 55 adult KS patients (42 men and 13 women), of whom 41 had monoallelic mutations and 14 biallelic mutations in PROK2 or PROKR2. Results: Biallelic mutations were associated with more frequent cryptorchidism (70% vs. 34%, P < 0.05) and microphallus (90% vs. 28%, P < 0.001) and lower mean testicular volume (1.2 ± 0.4 vs. 4.5 ± 6.0 ml; P<0.01) in male patients. Likewise, the testosterone level as well as the basal FSH level and peak LH level under GnRH-stimulation were lower in males with biallelic mutations (0.2 ± 0.1 vs. 0.7±0.8 ng/ml; P=0.05, 0.3±0.1 vs. 1.8±3.0 IU/liter; P<0.05, and 0.8±0.8 vs. 5.2±5.5 IU/liter; P<0.05, respectively). Nonreproductive, nonolfactory anomalies were rare in both sexes and were never found in patients with biallelic mutations. The mean body mass index of the patients (23.9± 4.2 kg/m2 in males and 26.3±6.6 kg/m2 in females) did not differ significantly from that of gender-, age-, and treatment-matched KS individuals who did not carry a mutation in PROK2 or PROKR2. Finally, circadian cortisol levels evaluated in five patients, including one with biallelic PROKR2 mutations, were normal in all cases. Conclusion: Male patients carrying biallelic mutations in PROK2 or PROKR2 have a less variable and on average a more severe reproductive phenotype than patients carrying monoallelic mutations in these genes. Nonreproductive, nonolfactory clinical anomalies associated with KS seem to be restricted to patients with monoallelic mutations. Copyright © 2010 by The Endocrine Society.

Callier P.,Service de Cytogenetique | Callier P.,University of Burgundy | Aral B.,University of Burgundy | Aral B.,Laboratoire Of Biologie Moleculaire | And 58 more authors.
Clinical Genetics | Year: 2013

The association of marfanoid habitus (MH) and intellectual disability (ID) has been reported in the literature, with overlapping presentations and genetic heterogeneity. A hundred patients (71 males and 29 females) with a MH and ID were recruited. Custom-designed 244K array-CGH (Agilent®; Agilent Technologies Inc., Santa Clara, CA) and MED12, ZDHHC9, UPF3B, FBN1, TGFBR1 and TGFBR2 sequencing analyses were performed. Eighty patients could be classified as isolated MH and ID: 12 chromosomal imbalances, 1 FBN1 mutation and 1 possibly pathogenic MED12 mutation were found (17%). Twenty patients could be classified as ID with other extra-skeletal features of the Marfan syndrome (MFS) spectrum: 4 pathogenic FBN1 mutations and 4 chromosomal imbalances were found (2 patients with both FBN1 mutation and chromosomal rearrangement) (29%). These results suggest either that there are more loci with genes yet to be discovered or that MH can also be a relatively non-specific feature of patients with ID. The search for aortic complications is mandatory even if MH is associated with ID since FBN1 mutations or rearrangements were found in some patients. The excess of males is in favour of the involvement of other X-linked genes. Although it was impossible to make a diagnosis in 80% of patients, these results will improve genetic counselling in families. © 2013 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd.

Abifadel M.,French Institute of Health and Medical Research | Abifadel M.,Saint - Joseph University | Guerin M.,French Institute of Health and Medical Research | Guerin M.,University Pierre and Marie Curie | And 37 more authors.
Atherosclerosis | Year: 2012

Background: The identification of mutations in PCSK9 (proprotein convertase subtilisin kexin9) in autosomal dominant hypercholesterolemia (ADH), has revealed the existence of a new player in cholesterol homeostasis. PCSK9 has been shown to enhance the degradation of the LDL receptor (LDLR) at the cell surface. Gain-of-function mutations of PCSK9 induce ADH and are very rare, but their identification is crucial in studying PCSK9's role in hypercholesterolemia, its detailed trafficking pathway and its impact on the LDLR. Methods: In order to identify new mutations and understand the exact mechanisms of action of mutated PCSK9, PCSK9 was sequenced in 75 ADH patients with no mutations in the LDLR or APOB genes. Functional analyses in cell culture were conducted and the impact of novel PCSK9 mutations on the quantitative and qualitative features of lipoprotein particles and on the HDL-mediated cellular cholesterol efflux was studied. Results: Among these 75 ADH probands with no mutations in the LDLR or APOB genes, four gain-of-function mutations of PCSK9 were identified, of which two were novel: the p.Leu108Arg and the p.Asp35Tyr substitutions. In vitro studies of their consequences on the activity of PCSK9 on cell surface levels of LDLR showed that the p.Leu108Arg mutation clearly results in a gain-of-function, while the p.Asp35Tyr mutation created a novel Tyr-sulfation site, which may enhance the intracellular activity of PCSK9. Conclusion: These data further contribute to the characterization of PCSK9 mutations and to better understanding of the impact on cholesterol metabolism of this new therapeutic target. © 2012 Elsevier Ireland Ltd.

Bakillah A.,Paris Observatory | Guillot R.,Paris Observatory | Urios P.,Paris Observatory | Urios P.,Laboratoire Dhormonologie Et Of Genetique | And 4 more authors.
Amino Acids | Year: 2012

Collagen IV accumulation is characteristic of diabetic angiopathy. To test the possible contribution of GH, we studied its effects on collagen IV production by human umbilical vein endothelial cells at 5.5 and 16.7 mmol/l glucose. GH (100 ng/ml) markedly increased collagen IV level in the culture supernatant and in the insoluble extracellular matrix and cell fraction at both glucose concentrations. This stimulating effect of GH was additional to that of high glucose. It was more pronounced on collagen IV than on total protein synthesis. GH increased free latent gelatinase activity slightly at normal and markedly at high glucose. Using GF109203X, a PKC inhibitor, we observed that high glucose, but not GH, activated PKC. These two factors stimulating collagen IV production appear to work through different pathways, favoring an additivity of their effects. This supports the contribution of high plasma GH in diabetic vascular basement membrane thickening. © Springer-Verlag 2011.

Wahbi K.,Institute Of Myologie | Wahbi K.,University Pierre and Marie Curie | Behin A.,Institute Of Myologie | Becane H.M.,Institute Of Myologie | And 14 more authors.
International Journal of Cardiology | Year: 2013

Background: Homozygous mutations in ANO5, a gene encoding anoctamin 5, a putative calcium-activated chloride channel, have recently been reported in patients with adult-onset myopathies or isolated high-CK levels. Cardiomyopathy has not previously been reported in these populations despite a proven expression of anoctamin 5 in the cardiac muscle. Methods: Patients presenting for the management of high-CK levels or overt myopathy with proven ANO5 mutations were prospectively investigated between June 2010 and March 2012 in Pitié Salpêtrière Hospital, according to a standardised protocol. Neurological and cardiological clinical examinations, CK assessment, electrocardiogram (ECG), and echocardiography were performed, as well as cardiac MRI and coronary CT angiography in patients with left ventricular (LV) dysfunction. Results: Our study included 19 consecutive patients (male = 15, age = 46.2 ± 12.7 years) from 16 families. Five had asymptomatic high-CK levels and 14 had overt myopathy. One patient had a personal history of stable coronary artery disease with normal ventricular function. ECG showed ventricular premature beats in one patient. Echocardiography displayed LV dilatation in two patients, LV dysfunction in one, and both abnormalities in two who fulfilled criteria for dilated cardiomyopathy which was confirmed by cardiac MRI and normal CT angiography. Conclusions: Dilated cardiomyopathy is a potential complication in patients with myopathies due to mutations in the ANO5 gene whose screening requires specific procedures. © 2012 Elsevier Ireland Ltd. All rights reserved.

Loading Laboratoire Of Biochimie Et Of Genetique Moleculaire collaborators
Loading Laboratoire Of Biochimie Et Of Genetique Moleculaire collaborators