1
|
Srinivasan T, Kumar KRR, Meur G, Kirti PB. Heterologous expression of Arabidopsis NPR1 (AtNPR1) enhances oxidative stress tolerance in transgenic tobacco plants. Biotechnol Lett 2009; 31:1343-51. [PMID: 19466562 DOI: 10.1007/s10529-009-0022-5] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2009] [Revised: 04/01/2009] [Accepted: 05/07/2009] [Indexed: 12/25/2022]
Abstract
In Arabidopsis, NPR1 (non-expressor of pathogenesis related genes 1, AtNPR1) functions downstream of salicylic acid (SA) and modulates the SA mediated systemic acquired resistance. It is also involved in a cross talk with the jasmonate pathway that is essential for resistance against herbivores and necrotrophic pathogens. Overexpression of AtNPR1 in transgenic plants resulted in enhanced disease resistance. Recently, tobacco transgenic plants expressing AtNPR1 were shown to be tolerant to the early instars of Spodoptera litura (Meur et al., Physiol Plant 133:765-775, 2008). In this communication, we show that the heterologous expression of AtNPR1 in tobacco has also enhanced the oxidative stress tolerance. The transgenic plants exhibited enhanced tolerance to the treatment with methyl viologen. This tolerance was associated with the constitutive upregulation of PR1, PR2 (glucanase), PR5 (thaumatin like protein), ascorbate peroxidase (APX) and Cu(2+)/Zn(2+) superoxide dismutase (SOD). This is the first demonstration of the novel function of heterologous expression of AtNPR1 in oxidative stress tolerance in transgenic tobacco.
Collapse
|
|
16 |
35 |
2
|
Cannata Serio M, Graham LA, Ashikov A, Larsen LE, Raymond K, Timal S, Le Meur G, Ryan M, Czarnowska E, Jansen JC, He M, Ficicioglu C, Pichurin P, Hasadsri L, Minassian B, Rugierri A, Kalimo H, Ríos‐Ocampo WA, Gilissen C, Rodenburg R, Jonker JW, Holleboom AG, Morava E, Veltman JA, Socha P, Stevens TH, Simons M, Lefeber DJ. Mutations in the V-ATPase Assembly Factor VMA21 Cause a Congenital Disorder of Glycosylation With Autophagic Liver Disease. Hepatology 2020; 72:1968-1986. [PMID: 32145091 PMCID: PMC7483274 DOI: 10.1002/hep.31218] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/16/2019] [Revised: 02/14/2020] [Accepted: 02/14/2020] [Indexed: 12/14/2022]
Abstract
BACKGROUND AND AIMS Vacuolar H+-ATP complex (V-ATPase) is a multisubunit protein complex required for acidification of intracellular compartments. At least five different factors are known to be essential for its assembly in the endoplasmic reticulum (ER). Genetic defects in four of these V-ATPase assembly factors show overlapping clinical features, including steatotic liver disease and mild hypercholesterolemia. An exception is the assembly factor vacuolar ATPase assembly integral membrane protein (VMA21), whose X-linked mutations lead to autophagic myopathy. APPROACH AND RESULTS Here, we report pathogenic variants in VMA21 in male patients with abnormal protein glycosylation that result in mild cholestasis, chronic elevation of aminotransferases, elevation of (low-density lipoprotein) cholesterol and steatosis in hepatocytes. We also show that the VMA21 variants lead to V-ATPase misassembly and dysfunction. As a consequence, lysosomal acidification and degradation of phagocytosed materials are impaired, causing lipid droplet (LD) accumulation in autolysosomes. Moreover, VMA21 deficiency triggers ER stress and sequestration of unesterified cholesterol in lysosomes, thereby activating the sterol response element-binding protein-mediated cholesterol synthesis pathways. CONCLUSIONS Together, our data suggest that impaired lipophagy, ER stress, and increased cholesterol synthesis lead to LD accumulation and hepatic steatosis. V-ATPase assembly defects are thus a form of hereditary liver disease with implications for the pathogenesis of nonalcoholic fatty liver disease.
Collapse
|
research-article |
5 |
28 |
3
|
Stieger K, Mendes-Madeira A, Meur GL, Weber M, Deschamps JY, Nivard D, Provost N, Moullier P, Rolling F. Oral administration of doxycycline allows tight control of transgene expression: a key step towards gene therapy of retinal diseases. Gene Ther 2007; 14:1668-73. [PMID: 17914405 DOI: 10.1038/sj.gt.3303034] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Gene transfer of neurotrophic or antiangiogenic factors has been shown to improve photoreceptor survival in retinal degenerative disorders (that is retinitis pigmentosa) and to prevent neovascularization in retinal vascular diseases (that is age-related macular degeneration, diabetic retinopathy). Expression of such neurotrophic or antiangiogenic factors after gene transfer requires the use of a regulatory system to control transgene expression to avoid unwanted side effects in cases of overexpression. In a previous study, we demonstrated that rAAV-mediated gene transfer of the tetracycline-regulatable (tetR) system allows transgene regulation in the retina of nonhuman primates after intravenous administration of doxycycline (Dox). The purpose of this study was to evaluate oral administration of Dox to control transgene expression in the retina, since the pharmacokinetics after oral administration of the inducer drug represent a key factor when considering advancing to clinical trials. We report on the outcome of this evaluation and demonstrate that oral administration of Dox at a dose that is clinically used in humans (5 mg kg(-1) per day) is capable to continuously induce transgene expression in all macaques tested for 6 months. Moreover, control of transgene expression persists up to 4 years post-subretinal injection, with maximal induced levels of transgene product remaining stable over time.
Collapse
|
Research Support, Non-U.S. Gov't |
18 |
25 |
4
|
Marchesin V, Pérez-Martí A, Le Meur G, Pichler R, Grand K, Klootwijk ED, Kesselheim A, Kleta R, Lienkamp S, Simons M. Molecular Basis for Autosomal-Dominant Renal Fanconi Syndrome Caused by HNF4A. Cell Rep 2020; 29:4407-4421.e5. [PMID: 31875549 PMCID: PMC6941224 DOI: 10.1016/j.celrep.2019.11.066] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2019] [Revised: 10/08/2019] [Accepted: 11/15/2019] [Indexed: 12/26/2022] Open
Abstract
HNF4A is a nuclear hormone receptor that binds DNA as an obligate homodimer. While all known human heterozygous mutations are associated with the autosomal-dominant diabetes form MODY1, one particular mutation (p.R85W) in the DNA-binding domain (DBD) causes additional renal Fanconi syndrome (FRTS). Here, we find that expression of the conserved fly ortholog dHNF4 harboring the FRTS mutation in Drosophila nephrocytes caused nuclear depletion and cytosolic aggregation of a wild-type dHNF4 reporter protein. While the nuclear depletion led to mitochondrial defects and lipid droplet accumulation, the cytosolic aggregates triggered the expansion of the endoplasmic reticulum (ER), autophagy, and eventually cell death. The latter effects could be fully rescued by preventing nuclear export through interfering with serine phosphorylation in the DBD. Our data describe a genomic and a non-genomic mechanism for FRTS in HNF4A-associated MODY1 with important implications for the renal proximal tubule and the regulation of other nuclear hormone receptors.
HNF4 controls lipid metabolism in Drosophila nephrocytes The kidney disease mutation R85W shows dominant-negative effects in nephrocytes Dephosphorylation at S87 prevents the dominant-negative effects R85W mutation causes mitochondrial dysfunction in reprogrammed renal epithelial cells
Collapse
|
Research Support, Non-U.S. Gov't |
5 |
24 |
5
|
Lawwill T, Meur G, Howard CW. Lateral inhibition in the central visual field of an amblyopic subject. Am J Ophthalmol 1973; 76:225-8. [PMID: 4725006 DOI: 10.1016/0002-9394(73)90165-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
|
|
52 |
8 |
6
|
|
|
60 |
4 |
7
|
Conreur L, Meur G. [Influence of wavelength of the light stimulus in the phenomenon of retinal spacial summation]. BULLETIN DE LA SOCIETE BELGE D'OPHTALMOLOGIE 1966; 143:532-541. [PMID: 5981999] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
|
|
59 |
|
8
|
Meur G, Frankental D. [Ocular hypotension and cataract in pregnancy, apropos of a case]. BULLETIN DE LA SOCIETE BELGE D'OPHTALMOLOGIE 1980; 187:83-87. [PMID: 7470711] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
|
English Abstract |
45 |
|
9
|
Meur G. [Contribution to the study of retinal space summations]. ANNALES D'OCULISTIQUE 1965; 198:436-47. [PMID: 5833859] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
|
|
60 |
|
10
|
Meur G. [Injuries of the uvea]. ARCHIVES D'OPHTALMOLOGIE 1976; 36:349-52. [PMID: 135550] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
|
|
49 |
|
11
|
Meur G, Flament-Durand J, Denis R, Verougstraete C. [Retinal tumor and cerebral tumor: a case]. BULLETIN DE LA SOCIETE BELGE D'OPHTALMOLOGIE 1971; 159:661-70. [PMID: 5151377] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
|
|
54 |
|
12
|
Meur G. [The artificial lens: the folly of yesterday, the standard of today]. BULLETIN ET MEMOIRES DE L'ACADEMIE ROYALE DE MEDECINE DE BELGIQUE 2000; 154:273-8; discussion 278-80. [PMID: 10687245] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/15/2023]
Abstract
Traditional cataract operation (dislocation of the crystalline lens into the vitreous body by external pressure or by needling) is nearly as old as mankind. The idea of implanting an artificial lenticulus is not new but this was only performed for the first time in 1949. In the last 50 years, a better knowledge of corneal and retinal physiology, as well as the improvements of intraocular lens material and design, have led to very safe routine surgery.
Collapse
|
English Abstract |
25 |
|
13
|
Al Zouabi L, Stefanutti M, Roumeliotis S, Le Meur G, Boumard B, Riddiford N, Rubanova N, Bohec M, Gervais L, Servant N, Bardin AJ. Molecular underpinnings and environmental drivers of loss of heterozygosity in Drosophila intestinal stem cells. Cell Rep 2023; 42:113485. [PMID: 38032794 DOI: 10.1016/j.celrep.2023.113485] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2022] [Revised: 09/29/2023] [Accepted: 11/08/2023] [Indexed: 12/02/2023] Open
Abstract
During development and aging, genome mutation leading to loss of heterozygosity (LOH) can uncover recessive phenotypes within tissue compartments. This phenomenon occurs in normal human tissues and is prevalent in pathological genetic conditions and cancers. While studies in yeast have defined DNA repair mechanisms that can promote LOH, the predominant pathways and environmental triggers in somatic tissues of multicellular organisms are not well understood. Here, we investigate mechanisms underlying LOH in intestinal stem cells in Drosophila. Infection with the pathogenic bacteria, Erwinia carotovora carotovora 15, but not Pseudomonas entomophila, increases LOH frequency. Using whole genome sequencing of somatic LOH events, we demonstrate that they arise primarily via mitotic recombination. Molecular features and genetic evidence argue against a break-induced replication mechanism and instead support cross-over via double Holliday junction-based repair. This study provides a mechanistic understanding of mitotic recombination, an important mediator of LOH, and its effects on stem cells in vivo.
Collapse
|
|
2 |
|
14
|
Meur G, Conreur L. [Influence of dazzle in an eye on the state of adaptation of the contralateral eye in a normal subject]. Vision Res 1973; 13:1005-8. [PMID: 4713915 DOI: 10.1016/0042-6989(73)90139-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
|
|
52 |
|
15
|
Danis P, Meur G. [Lowe's oculo-cerebro-renal syndrome (histologic ocular study of 2 cases)]. BULLETIN DE LA SOCIETE BELGE D'OPHTALMOLOGIE 1971; 159:555-64. [PMID: 5151371] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
|
|
54 |
|
16
|
Meur G, Meur-Terfve L. [Peri-ocular anesthesia by unique caruncular injection in surgery of the anterior segment]. BULLETIN DE LA SOCIETE BELGE D'OPHTALMOLOGIE 1998; 268:111-3. [PMID: 9810091] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
Abstract
PURPOSE To evaluate the efficacy and safety of medial canthus local anesthesia in anterior segment surgery. METHODS From December 1st 1996 to October 24th 1997, 234 patients underwent anterior segment surgery under caruncular single injection anesthesia: cataract, phacotrabeculectomy, corneal graft and triple procedure. RESULTS The technique achieved good globe anesthesia and lid and orbital muscle akinesia. Neither globe perforation nor lid ecchymoses were observed. CONCLUSION Caruncular single injection appears to be a good alternative to classical peribulbar block.
Collapse
|
English Abstract |
27 |
|
17
|
Lawwill T, Meur G. Retinal rivalry in functional amblyopia. ARCHIVES OF OPHTHALMOLOGY (CHICAGO, ILL. : 1960) 1979; 97:1100-2. [PMID: 444142 DOI: 10.1001/archopht.1979.01020010554009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Thirteen patients with varying degrees of amblyopia were examined for perception of retinal rivalry with the use of the phase difference haploscope. Visual acuity was varied in the fixing eye by the addition of plus lenses, equalizing ocular dominance. Retinal rivalry could be detected over wide ranges of visual acuity disparity by amblyopic patients with visual acuity better than 20/50. Rivalry could not be detected, however, by patients with less than 20/50 visual acuity in their amblyopic eye.
Collapse
|
|
46 |
|
18
|
Danis P, Meur G. [The summation phenomenon in strabismic amblyopia]. Doc Ophthalmol 1967; 23:203-9. [PMID: 5583477 DOI: 10.1007/bf02550748] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
|
|
58 |
|
19
|
Lawwill T, Cox WE, Tuttle D, Meur G, Burian HM. Lateral inhibition and the VER in the central field of an amblyopic subject. INVESTIGATIVE OPHTHALMOLOGY 1973; 12:154-6. [PMID: 4683667] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
|
|
52 |
|
20
|
Metge P, Meur G. About encircling haptics. J Cataract Refract Surg 1998; 24:1170. [PMID: 9768386 DOI: 10.1016/s0886-3350(98)80004-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
|
Comment |
27 |
|
21
|
Meur G. A new capsule supported intraocular lens. OPHTHALMIC SURGERY 1987; 18:395-6. [PMID: 3601350] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
|
|
38 |
|
22
|
Meur G, Detilleux JM. [Statistical analysis of various sensory characteristics in healthy and amblyopic patients]. BULLETIN DE LA SOCIETE BELGE D'OPHTALMOLOGIE 1967; 147:438-45. [PMID: 5621797] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
|
|
58 |
|
23
|
Meur G, Maenhaut M, Szyper C. [Implantation of an intra-ocular lens in a case of crystallin ectopy]. OPHTALMOLOGIE : ORGANE DE LA SOCIETE FRANCAISE D'OPHTALMOLOGIE 1987; 1:257-60. [PMID: 3153864] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
|
Case Reports |
38 |
|
24
|
Maenhaut M, Meur G. [Incidence of cystoid macular edema in the implant of retro-pupillary lenses]. OPHTALMOLOGIE : ORGANE DE LA SOCIETE FRANCAISE D'OPHTALMOLOGIE 1987; 1:431-3. [PMID: 3153910] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
|
|
38 |
|
25
|
Meur G. [Character of perimetric defects in retinal diseases]. J Fr Ophtalmol 1978; 1:163-9. [PMID: 149814] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
|
|
47 |
|