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Allegrini B, Jedele S, David Nguyen L, Mignotet M, Rapetti-Mauss R, Etchebest C, Fenneteau O, Loubat A, Boutet A, Thomas C, Durin J, Petit A, Badens C, Garçon L, Da Costa L, Guizouarn H. New KCNN4 Variants Associated With Anemia: Stomatocytosis Without Erythrocyte Dehydration. Front Physiol 2022; 13:918620. [PMID: 36003639 PMCID: PMC9393219 DOI: 10.3389/fphys.2022.918620] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2022] [Accepted: 05/27/2022] [Indexed: 11/13/2022] Open
Abstract
The K+ channel activated by the Ca2+, KCNN4, has been shown to contribute to red blood cell dehydration in the rare hereditary hemolytic anemia, the dehydrated hereditary stomatocytosis. We report two de novo mutations on KCNN4, We reported two de novo mutations on KCNN4, V222L and H340N, characterized at the molecular, cellular and clinical levels. Whereas both mutations were shown to increase the calcium sensitivity of the K+ channel, leading to channel opening for lower calcium concentrations compared to WT KCNN4 channel, there was no obvious red blood cell dehydration in patients carrying one or the other mutation. The clinical phenotype was greatly different between carriers of the mutated gene ranging from severe anemia for one patient to a single episode of anemia for the other patient or no documented sign of anemia for the parents who also carried the mutation. These data compared to already published KCNN4 mutations question the role of KCNN4 gain-of-function mutations in hydration status and viability of red blood cells in bloodstream.
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Affiliation(s)
- B. Allegrini
- Université Côte d’Azur, CNRS, INSERM, iBV, Nice, France
| | - S. Jedele
- Université Paris Cité and Université des Antilles, Inserm, BIGR, Paris, France
| | - L. David Nguyen
- Université Paris Cité, Paris, France
- AP-HP, Service d’Hématologie Biologique, Hôpital R. Debré, Paris, France
| | - M. Mignotet
- Université Côte d’Azur, CNRS, INSERM, iBV, Nice, France
| | | | - C. Etchebest
- Université Paris Cité and Université des Antilles, Inserm, BIGR, Paris, France
| | - O. Fenneteau
- AP-HP, Service d’Hématologie Biologique, Hôpital R. Debré, Paris, France
| | - A. Loubat
- Université Côte d’Azur, CNRS, INSERM, iBV, Nice, France
| | - A. Boutet
- Hôpital Saint Nazaire, Saint-Nazaire, France
| | - C. Thomas
- CHU Nantes, Service Oncologie-hématologie et Immunologie Pédiatrique, Nantes, France
| | - J. Durin
- Sorbonne Université, AP-HP, Hôpital Armand Trousseau, Service d'Hématologie Oncologie Pédiatrique, Paris, France
| | - A. Petit
- Sorbonne Université, AP-HP, Hôpital Armand Trousseau, Service d'Hématologie Oncologie Pédiatrique, Paris, France
| | - C. Badens
- Aix Marseille Univ, INSERM, MMG, Marseille, France
- AP-HM, Department of Genetic, Marseille, France
| | - L. Garçon
- Université Picardie Jules Verne, Unité EA4666 Hematim, Amiens, France
- CHU Amiens, Service d'Hématologie Biologique, Amiens, France
| | - L. Da Costa
- Université Paris Cité, Paris, France
- AP-HP, Service d’Hématologie Biologique, Hôpital R. Debré, Paris, France
- Université Picardie Jules Verne, Unité EA4666 Hematim, Amiens, France
| | - H. Guizouarn
- Université Côte d’Azur, CNRS, INSERM, iBV, Nice, France
- *Correspondence: H. Guizouarn,
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Grange L, Guichard I, Berger C, Garçon L, Picard V, Cathébras P. Une nouvelle cause hématologique de surcharge martiale sévère. Rev Med Interne 2018. [DOI: 10.1016/j.revmed.2018.03.048] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Caulier A, Rapetti-Mauss R, Guizouarn H, Picard V, Garçon L, Badens C. Primary red cell hydration disorders: Pathogenesis and diagnosis. Int J Lab Hematol 2018; 40 Suppl 1:68-73. [DOI: 10.1111/ijlh.12820] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2018] [Accepted: 03/09/2018] [Indexed: 11/26/2022]
Affiliation(s)
- A. Caulier
- EA HEMATIM; Université Picardie Jules Verne; Amiens France
| | | | - H. Guizouarn
- CNRS, INSERM, IBV; Université Côte d'Azur; Nice France
| | - V. Picard
- Faculté de Pharmacie; Université Paris Sud-Paris Saclay; Chatenay Malabry France
- AP-HP; Département d'Hématologie; Hôpital Bicêtre; Le Kremlin-Bicêtre France
| | - L. Garçon
- EA HEMATIM; Université Picardie Jules Verne; Amiens France
- Service d'Hématologie Biologique; CHU Amiens; Amiens France
| | - C. Badens
- INSERM, MMG; Aix Marseille University; Marseille France
- Laboratoire de Génétique Moléculaire; APHM; Marseille France
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Abstract
Population ageing and increase in cancer incidence may lead to a decreased availability of red blood cell units. Thus, finding an alternative source of red blood cells is a highly relevant challenge. The possibility to reproduce in vitro the human erythropoiesis opens a new era, particularly since the improvement in the culture systems allows to produce erythrocytes from induced-Pluripotent Stem Cells (iPSCs), or CD34+ Hematopoietic Stem Cells (HSCs). iPSCs have the advantage of in vitro self-renewal, but lead to poor amplification and maturation defects (high persistence of nucleated erythroid precursors). Erythroid differentiation from HSC allows a far better amplification and adult-like hemoglobin synthesis. But the inability of these progenitors to self-renew in vitro remains a limit in their use as a source of stem cells. A major improvement would consist in immortalizing these erythroid progenitors so that they could expand indefinitively. Inducible transgenesis is the first way to achieve this goal. To date, the best immortalized-cell models involve strong oncogenes induction, such as c-Myc, Bcl-xL, and mostly E6/E7 HPV16 viral oncoproteins. However, the quality of terminal differentiation of erythroid progenitors generated by these oncogenes is not optimal yet and the long-term stability of such systems is unknown. Moreover, viral transgenesis and inducible expression of oncogenes raise important problems in term of safety, since the enucleation rate is not 100% and no nucleated cells having replicative capacities should be present in the final product.
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Affiliation(s)
- A Caulier
- EA4666, CURS, université Picardie-Jules-Verne, 1, chemin du Thil, 80025 Amiens, France
| | - L Guyonneau Harmand
- Établissement français du sang, 20, avenue du Stade-de-France, 93218 La Plaine Saint-Denis cedex, France; UMRS938, université Pierre-et-Marie-Curie Paris 6, 4, place Jussieu, 75005 Paris, France
| | - L Garçon
- EA4666, CURS, université Picardie-Jules-Verne, 1, chemin du Thil, 80025 Amiens, France; D408, service d'hématologie biologique, CHU Amiens-Picardie, 80054 Amiens cedex 1, France.
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King MJ, Garçon L, Hoyer JD, Iolascon A, Picard V, Stewart G, Bianchi P, Lee SH, Zanella A. ICSH guidelines for the laboratory diagnosis of nonimmune hereditary red cell membrane disorders. Int J Lab Hematol 2015; 37:304-25. [PMID: 25790109 DOI: 10.1111/ijlh.12335] [Citation(s) in RCA: 102] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2014] [Accepted: 01/22/2015] [Indexed: 01/19/2023]
Abstract
INTRODUCTION Hereditary spherocytosis (HS), hereditary elliptocytosis (HE), and hereditary stomatocytosis (HSt) are inherited red cell disorders caused by defects in various membrane proteins. The heterogeneous clinical presentation, biochemical and genetic abnormalities in HS and HE have been well documented. The need to raise the awareness of HSt, albeit its much lower prevalence than HS, is due to the undesirable outcome of splenectomy in these patients. METHODS The scope of this guideline is to identify the characteristic clinical features, the red cell parameters (including red cell morphology) for these red cell disorders associated, respectively, with defective cytoskeleton (HS and HE) and abnormal cation permeability in the lipid bilayer (HSt) of the red cell. The current screening tests for HS are described, and their limitations are highlighted. RESULTS An appropriate diagnosis can often be made when the screening test result(s) is reviewed together with the patient's clinical/family history, blood count results, reticulocyte count, red cell morphology, and chemistry results. SDS-polyacrylamide gel electrophoresis of erythrocyte membrane proteins, monovalent cation flux measurement, and molecular analysis of membrane protein genes are specialist tests for further investigation. CONCLUSION Specialist tests provide additional evidence in supporting the diagnosis and that will facilitate the management of the patient. In the case of a patient's clinical phenotype being more severe than the affected members within the immediate family, molecular testing of all family members is useful for confirming the diagnosis and allows an insight into the molecular basis of the abnormality such as a recessive mode of inheritance or a de novo mutation.
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Affiliation(s)
- M-J King
- Membrane Biochemistry, NHS Blood and Transplant, Bristol, UK
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Ami O, Picone O, Garçon L, Castel C, Guitton C, Delaunay J, Frydman R, Senat MV. First-trimester nuchal abnormalities secondary to dehydrated hereditary stomatocytosis. Prenat Diagn 2009; 29:1071-4. [DOI: 10.1002/pd.2342] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Guitton C, Garçon L, Cynober T, Gauthier F, Tchernia G, Delaunay J, Leblanc T, Thuret I, Bader-Meunier B. Sphérocytose héréditaire : diagnostic et prise en charge chez l’enfant. Arch Pediatr 2009; 16:556-8. [DOI: 10.1016/s0929-693x(09)74065-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Garçon L, Libura M, Delabesse E, Valensi F, Asnafi V, Berger C, Schmitt C, Leblanc T, Buzyn A, Macintyre E. DEK-CAN molecular monitoring of myeloid malignancies could aid therapeutic stratification. Leukemia 2005; 19:1338-44. [PMID: 15973457 DOI: 10.1038/sj.leu.2403835] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The t(6;9)(p23;q34) is a recurrent chromosomal abnormality observed in 1% of acute myelogenous leukemia (AML), which generates a fusion transcript between DEK and CAN/NUP214 genes. We used a DEK-CAN real-time quantitative (RQ)-PCR strategy to analyze 79 retrospective and prospective samples from 12 patients. Five patients reached DEK-CAN negativity (sensitivity 10(-5)); all underwent early allogeneic hematopoietic stem cell transplantation (median 5.5 months from diagnosis) with some demonstrating molecular positivity at the time of allograft. All four cases in CCR with adequate follow-up (median 18.5 months, range 13--95) demonstrate persistent molecular negativity, whereas all seven patients with persistent DEK-CAN positivity died at a median of 12 months from diagnosis (range 7--27). We conclude that DEK-CAN molecular monitoring by RQ-PCR in t(6;9) malignancies is a useful tool for individual patient management and that molecular negativity is indispensable for survival, but should not be a prerequisite for allografting in this rare, poor prognosis, subset of AML.
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Affiliation(s)
- L Garçon
- Faculté de Medecine, Université Paris-Descartes, INSERM EMI U210 and AP-HP Hématologie-biologique, Hôpital Necker- Enfants Malades, rue de Sèvres, Paris cedex, France
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Decraene C, Garçon L, Lacout C, Sabri S, Auffray C, Vainchenker W, Duménil D, Piétu G, Svinartchuk F. Zyxin is up-regulated during megakaryocytic differentiation of human UT-7/c-mpl cells. Biochem Biophys Res Commun 2004; 318:439-43. [PMID: 15120620 DOI: 10.1016/j.bbrc.2004.04.047] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2004] [Indexed: 11/20/2022]
Abstract
To characterize genes involved in megakaryocytic commitment, we compared expression profiles of bipotent cells (UT-7/c-mpl) with those of the same cells induced to differentiate towards megakaryopoiesis in the presence of TPO. Using cDNA arrays, we showed that 12 out of 2260 genes changed their expression level after 6h of TPO stimulation. One of these genes encodes for zyxin, a cytoskeleton protein component. Zyxin is up-regulated at the mRNA and protein levels in UT-7/c-mpl cells in response to TPO confirming the reliability of the cDNA array technology. Similarly, when CD34 positive cells were induced to differentiate into megakaryocytes, zyxin mRNA was accumulated. Furthermore, when megakaryocytes were allowed to spread on fibrinogen, formation of stress fibers and lamellipodia was induced and zyxin was localized at the picks of actin stress fibers. These results suggest an important role for zyxin during megakaryocytic differentiation and more precisely in the regulation of the integrin mediated adhesion process in megakaryocytes.
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Affiliation(s)
- C Decraene
- Genexpress, CNRS ERS1984, BP8, 94801 Villejuif, France
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10
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Abstract
RNA interference, the inhibition of gene expression by double-stranded RNA, provides a powerful tool for functional studies once the sequence of a gene is known. In most mammalian cells, only short molecules can be used because long ones induce the interferon pathway. With the identification of a proper target sequence, the penetration of the oligonucleotides constitutes the most serious limitation in the application of this technique. Here we show that a small interfering RNA (siRNA) targeting the mRNA of the kinesin Eg5 induces a rapid mitotic arrest and provides a convenient assay for the optimization of siRNA transfection. Thus, dose responses can be established for different transfection techniques, highlighting the great differences in response to transfection techniques of various cell types. We report that the calcium phosphate precipitation technique can be an efficient and cost-effective alternative to Oligofectamine in some adherent cells, while electroporation can be efficient for some cells growing in suspension such as hematopoietic cells and some adherent cells. Significantly, the optimal parameters for the electroporation of siRNA differ from those for plasmids, allowing the use of milder conditions that induce less cell toxicity. In summary, a single siRNA leading to an easily assayed phenotype can be used to monitor the transfection of siRNA into any type of proliferating cells of both human and murine origin.
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Affiliation(s)
- D Weil
- CNRS UPR1983, Institut André Lwoff, 7 rue Guy Moquet, 94801 Villejuif, France
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Jacob N, Guillaume L, Garçon L, Foglietti MJ. [Determination of total plasma homocysteine and other aminothiols by liquid chromatography coupled to the detection by fluorescence]. Ann Biol Clin (Paris) 1997; 55:583-91. [PMID: 9499919] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Plasma concentrations of homocysteine, cysteine, cysteinylglycine and glutathione were measured using a HPLC technique with fluorescence detection of the derivatives obtained with 7-fluoro-2,1,3-benzoxadiazole-4-sulfonamide (ABD-F). Blood was drawn into chilled EDTA-evacuated tubes. After centrifugation at 4 degrees C without delay, plasma samples were kept frozen at -20 degrees C until analysis. Reduction of protein bound aminothiols and disulfides standards was achieved with tri-n-butylphosphine. N-acetylcysteine was used as internal standard. After protein precipitation, derivatization was carried out at pH 8.0 and 50 degrees C for 20 min. Stability of ABD-thiols was ensured for at least 5 days by lowering pH to 2. Derivatives were separated by isocratic elution on a Waters mu Bondapak C18 column (10 microns, 3.9 x 300 mm) with 0.1 M phosphate buffer pH 3.2 containing 10% acetonitrile. Excitation and emission wavelengths were 385 and 515 nm. Retention times were 4.9, 5.8, 7.3, 9.9 and 20.1 min respectively for cysteine, cysteinylglycine, homocysteine, glutathione and N-acetylcysteine. Peaks were quantified by comparison to a standard curve prepared by plotting peak height versus the different levels of known standard solutions after normalization with internal standard. Between-run CVs varied from 5 to 8.5%. The detection limit was < 0.5 mumol/l for homocysteine and glutathione. In plasma samples from healthy subjects, concentration of homocysteine was higher in men than in women (11.0 +/- 2.9 versus 9.2 +/- 2.7 mumol/l, p < 0.01). These values are similar to those obtained with other widely used methods.
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Affiliation(s)
- N Jacob
- Laboratoire de biochimie C, Groupe hospitalier Pitié-Salpêtrière, Paris
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Garçon L, Levillain D, Hascoett M, Le Her F, Le Her G. [Brain stem potentials evoked by "click" (author's transl)]. Ann Otolaryngol Chir Cervicofac 1980; 97:285-94. [PMID: 7406412] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
The authors describe the results of click at a recurrence frequency of 10 C/S in evoked responses of the brain stem, firstly in twenty normal individuals, with headphones or in a free area, making it possible to define a range of physiological responses to the different intensities, then in seventeen pathological individuals consisting of six cases of conduction deafness and eleven of perceptive deafness. On the basis of this study, they attempt to demonstrate the value of this type of examination not only in the determination of objective auditory threshold, but also in that of the type of deafness: conductive or perceptive. The method even makes it possible to approximately define the general appearance of the frequency distribution at the threshold according to the slope of the different latencies of P5. In the opinion of the authors, the chief advantages are the decrease in the time required for the test and the possibility of its use in the study of prosthetic gain.
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Levillain D, Garçon L, Le Her F, Le Her G. [Contribution of brain stem evoked potentials in the control of hearing aid gain]. Rev Laryngol Otol Rhinol (Bord) 1979; 100:739-43. [PMID: 538362] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Garçon L, Jeannin C. [Cryotherapy in otorhinolaryngology]. JFORL J Fr Otorhinolaryngol Audiophonol Chir Maxillofac 1973; 22:241-2. [PMID: 4267928] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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