33 research outputs found

    C-Nap1 mutation affects centriole cohesion and is associated with a Seckel-like syndrome in cattle

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    Caprine-like Generalized Hypoplasia Syndrome (SHGC) is an autosomal-recessive disorder in Montbéliarde cattle. Affected animals present a wide range of clinical features that include the following: delayed development with low birth weight, hind limb muscular hypoplasia, caprine-like thin head and partial coat depigmentation. Here we show that SHGC is caused by a truncating mutation in the CEP250 gene that encodes the centrosomal protein C-Nap1. This mutation results in centrosome splitting, which neither affects centriole ultrastructure and duplication in dividing cells nor centriole function in cilium assembly and mitotic spindle organization. Loss of C-Nap1-mediated centriole cohesion leads to an altered cell migration phenotype. This discovery extends the range of loci that constitute the spectrum of autosomal primary recessive microcephaly (MCPH) and Seckel-like syndromes

    Early acute microvascular kidney transplant rejection in the absence of anti-HLA antibodies is associated with preformed IgG antibodies against diverse glomerular endothelial cell antigens

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    International audienceBACKGROUND: Although anti-HLA antibodies (Abs) cause most antibody-mediated rejections of renal allografts, non-anti-HLA Abs have also been postulated to contribute. A better understanding of such Abs in rejection is needed.METHODS: We conducted a nationwide study to identify kidney transplant recipients without anti-HLA donor-specific Abs who experienced acute graft dysfunction within 3 months after transplantation and showed evidence of microvascular injury, called acute microvascular rejection (AMVR). We developed a crossmatch assay to assess serum reactivity to human microvascular endothelial cells, and used a combination of transcriptomic and proteomic approaches to identify non-HLA Abs.RESULTS: We identified a highly selected cohort of 38 patients with early acute AMVR. Biopsy specimens revealed intense microvascular inflammation and the presence of vasculitis (in 60.5%), interstitial hemorrhages (31.6%), or thrombotic microangiopathy (15.8%). Serum samples collected at the time of transplant showed that previously proposed anti-endothelial cell Abs-angiotensin type 1 receptor (AT1R), endothelin-1 type A and natural polyreactive Abs-did not increase significantly among patients with AMVR compared with a control group of stable kidney transplant recipients. However, 26% of the tested AMVR samples were positive for AT1R Abs when a threshold of 10 IU/ml was used. The crossmatch assay identified a common IgG response that was specifically directed against constitutively expressed antigens of microvascular glomerular cells in patients with AMVR. Transcriptomic and proteomic analyses identified new targets of non-HLA Abs, with little redundancy among individuals.CONCLUSIONS: Our findings indicate that preformed IgG Abs targeting non-HLA antigens expressed on glomerular endothelial cells are associated with early AMVR, and that cell-based assays are needed to improve risk assessments before transplant

    IntĂ©rĂȘt de l'analyse du mĂ©conium pour Ă©valuer l'exposition aux toxiques in utero chez le nouveau-nĂ© (application Ă  l'Ă©tude de l'exposition aux traitements substitutifs aux opiacĂ©s au CHU de Caen)

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    Les nouveau-nĂ©s de mĂšres toxicomanes sont des enfants Ă  haut risque de complications pendant la grossesse et la pĂ©riode pĂ©rinatale. Une analyse toxicologique effectuĂ©e prĂ©cocement, en complĂ©ment des informations fournies par la mĂšre, permet de rechercher les substances psychoactives potentiellement consommĂ©es pendant la grossesse (alcool, tabac, stupĂ©fiants). Diverses matrices biologiques, nĂ©onatales ou maternelles, peuvent ĂȘtre utilisĂ©es pour cette recherche. Elles doivent prĂ©senter une large fenĂȘtre de dĂ©tection afin d'apprĂ©cier l'exposition aux toxiques durant la vie fƓtale. C'est le cas du mĂ©conium, dont l'intĂ©rĂȘt et les applications sont dĂ©crits plus particuliĂšrement dans ce mĂ©moire. Cette matrice intĂ©ressante a Ă©tĂ© choisie pour un protocole hospitalier de recherche clinique, rĂ©alisĂ© actuellement au CHU de Caen, dont l objectif est d Ă©valuer l intĂ©rĂȘt du dosage dans le mĂ©conium des mĂ©dicaments utilisĂ©s comme traitement de substitution aux opiacĂ©s (buprĂ©norphine et mĂ©thadone) comme facteur pronostique du dĂ©lai, de la sĂ©vĂ©ritĂ© et de la durĂ©e du syndrome de sevrage du nouveau-nĂ© (SSNN). Une mĂ©thode de dosage en chromatographie liquide couplĂ©e Ă  la spectromĂ©trie de masse en tandem a Ă©tĂ© dĂ©veloppĂ©e et validĂ©e pour cette Ă©tude. 10 patientes traitĂ©es par buprĂ©norphine, 12 par mĂ©thadone, et leurs nouveau-nĂ©s, sont inclus dans cette premiĂšre partie d Ă©tude La concentration en EDDP et le rapport mĂ©thadone/EDDP seraient corrĂ©lĂ©s avec la sĂ©vĂ©ritĂ© du SSNN et la quantitĂ© totale de morphine utilisĂ©e pour son traitement. Ces rĂ©sultats prĂ©liminaires doivent ĂȘtre confirmĂ©s dans l Ă©tude finale comportant un effectif supĂ©rieur Ă  30 pour chaque groupe.CAEN-BU MĂ©decine pharmacie (141182102) / SudocSudocFranceF

    Revue bibliographique des modifications apportées à la nomenclature minéralogique. LVIII

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    Cesbron Fabien, Kosakevitch Alexandre. Revue bibliographique des modifications apportées à la nomenclature minéralogique. LVIII. In: Bulletin de Minéralogie, volume 108, 6, 1985. pp. 859-869

    Revue bibliographique des modifications apportées à la nomenclature minéralogique. LX

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    Cesbron Fabien, Kosakevitch Alexandre. Revue bibliographique des modifications apportées à la nomenclature minéralogique. LX. In: Bulletin de Minéralogie, volume 109, 4, 1986. pp. 461-468

    Revue bibliographique des modifications apportées à la nomenclature minéralogique. LX

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    Cesbron Fabien, Kosakevitch Alexandre. Revue bibliographique des modifications apportées à la nomenclature minéralogique. LX. In: Bulletin de Minéralogie, volume 109, 4, 1986. pp. 461-468

    Un type de zircon exceptionnel : le zircon tabulaire {00l} du complexe alcalin de Meponda (Mozambique) ; signification génétique

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    A tabular zircon, with dominant {001} pinacoid, was observed in the sodium-rich pyroxene syenites of the Meponda alkaline complex, Mozambique. Comparison of its morphology with those of zircon crystals from several alkaline granites — Cameroun, Nigerian Air, Corsica — as well as with the morphology of some artificial crystals, seems to point out that the {001} form would preferentially develop in alkaline magmas with an agpaitic trend and where Si and Na play an important part.Un zircon tabulaire prĂ©sentant la forme dominante {001} a Ă©tĂ© mis en Ă©vidence dans les syĂ©nites alcalines Ă  pyroxĂšnes sodiques du complexe alcalin de Meponda, Mozambique. Le rapprochement de ce type de cristal avec celui d'autres zircons de divers granites alcalins du Cameroun, de l'AĂŻr nigĂ©rien et de Corse, ainsi que la comparaison avec certains cristaux obtenus par synthĂšse, semblent montrer que la forme {001} se dĂ©velopperait prĂ©fĂ©rentiellement dans des magmas alcalins Ă  tendance agpaĂŻtique oĂč Si et Na jouent un rĂŽle important.Cesbron Fabien, Lulin Jean-Marc, Parfenoff Alexandre. Un type de zircon exceptionnel : le zircon tabulaire {00l} du complexe alcalin de Meponda (Mozambique) ; signification gĂ©nĂ©tique. In: Bulletin de MinĂ©ralogie, volume 108, 6, 1985. pp. 825-828
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