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Mathis D, Prost J, Maeder G, Arackal L, Zhang H, Kurth S, Freiburghaus K, Nuoffer J. Specific GAG ratios in the diagnosis of mucopolysaccharidoses. JIMD Rep 2024; 65:116-123. [PMID: 38444580 PMCID: PMC10910216 DOI: 10.1002/jmd2.12412] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/26/2023] [Revised: 11/29/2023] [Accepted: 01/23/2024] [Indexed: 03/07/2024] Open
Abstract
Mucopolysaccharidoses (MPS) screening is tedious and still performed by analysis of total glycosaminoglycans (GAG) using 1,9-dimethylmethylene blue (DMB) photometric assay, although false positive and negative tests have been reported. Analysis of differentiated GAGs have been pursued classically by gel electrophoresis or more recently by quantitative LC-MS assays. Secondary elevations of GAGs have been reported in urinary tract infections (UTI). In this manuscript, we describe the diagnostic accuracy of urinary GAG measurements by LC-MS for MPS typing in 68 untreated MPS and mucolipidosis (ML) patients, 183 controls and 153 UTI samples. We report age-dependent reference values and cut-offs for chondroitin sulfate (CS), dermatan sulfate (DS), heparan sulfate (HS) and keratan sulfate (KS) and specific GAG ratios. The use of HS/DS ratio in combination to GAG concentrations normalized to creatinine improves the diagnostic accuracy in MPS type I, II, VI and VII. In total 15 samples classified to the wrong MPS type could be correctly assigned using HS/DS ratio. Increased KS/HS ratio in addition to increased KS improves discrimination of MPS type IV by excluding false positives. Some samples of UTI patients showed elevation of specific GAGs, mainly CS, KS and KS/HS ratio and could be misclassified as MPS type IV. Finally, DMB photometric assay performed in MPS and ML samples reveal four false negative tests (sensitivity of 94%). In conclusion, specific GAG ratios in complement to quantitative GAG values obtained by LC-MS enhance discrimination of MPS types. Exclusion of patients with UTI improve diagnostic accuracy in MPS IV but not in other types.
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Affiliation(s)
- Déborah Mathis
- University Institute of Clinical Chemistry, Inselspital, Bern University Hospital, University of BernBernSwitzerland
| | - Jean‐Christophe Prost
- University Institute of Clinical Chemistry, Inselspital, Bern University Hospital, University of BernBernSwitzerland
| | - Gabriela Maeder
- University Institute of Clinical Chemistry, Inselspital, Bern University Hospital, University of BernBernSwitzerland
| | - Liya Arackal
- University Institute of Clinical Chemistry, Inselspital, Bern University Hospital, University of BernBernSwitzerland
| | - Haoyue Zhang
- Biochemical Genetics LaboratoryDuke University Health SystemDurhamNorth CarolinaUSA
| | - Sandra Kurth
- University Institute of Clinical Chemistry, Inselspital, Bern University Hospital, University of BernBernSwitzerland
| | - Katrin Freiburghaus
- University Institute of Clinical Chemistry, Inselspital, Bern University Hospital, University of BernBernSwitzerland
| | - Jean‐Marc Nuoffer
- University Institute of Clinical Chemistry, Inselspital, Bern University Hospital, University of BernBernSwitzerland
- Department of Pediatrics, Division of Pediatric Endocrinology and Inborn Errors of MetabolismUniversity Children's Hospital BernBernSwitzerland
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Lommano E, Burri C, Maeder G, Guerne M, Bastic V, Patalas E, Gern L. Prevalence and genotyping of tick-borne encephalitis virus in questing Ixodes ricinus ticks in a new endemic area in western Switzerland. J Med Entomol 2012; 49:156-164. [PMID: 22308784 DOI: 10.1603/me11044] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Tick-borne encephalitis virus (TBEV) is the causative agent of tick-borne encephalitis (TBE) and causes neurological disease in humans in Eurasia. TBEV is transmitted by ticks of the genus Ixodes. Currently 10,000-12,000 clinical cases are reported annually in approximately 30 TBE endemic countries. Since 1990 the epidemiology of TBE is characterized by a global increase of clinical cases and an expansion of risk areas. Similar trends are also observed in Switzerland but few studies confirmed the emergence of new TBE foci by detecting viral RNA in field-collected ticks. In this study, free-living Ixodes ricinus (L.) ticks from one nonendemic and three new TBE endemic regions located in the Western part of Switzerland were screened during four consecutive years (2007-2010) for the presence of TBEV. A total of 9,868 I. ricinus ticks (6,665 nymphs and 3,203 adults) were examined in pools for TBEV by real-time reverse transcription polymerase chain reaction. Our results confirmed the presence of viral RNA in 0.1% (6/6120) of questing ticks collected in one new endemic region. Among TBE endemic sites, the minimal infection rate per 100 ticks tested ranged from 0.21 (1/477) to 0.95 (1/105). Four positive samples were sequenced and phylogenetic analysis of the NS5 gene showed that all TBEV nucleotide sequences belonged to the European subtype and were split into two distinct lineages originating probably independently from two distinct foci located North-East and East of the study region.
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Affiliation(s)
- E Lommano
- Institute of Biology, Laboratory of Eco-Epidemiology of Parasites, University of Neuchâtel, Emile-Argand 11, 2000 Neuchâtel, Switzerland
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Burri C, Bastic V, Maeder G, Patalas E, Gern L. Microclimate and the zoonotic cycle of tick-borne encephalitis virus in Switzerland. J Med Entomol 2011; 48:615-627. [PMID: 21661323 DOI: 10.1603/me10180] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The focal distribution of tick-borne encephalitis virus (TBEV; Flaviviridae, Flavivirus) appears to depend mainly on cofeeding transmission between infected Ixodes ricinus L. nymphs and uninfected larvae. To better understand the role of cofeeding ticks in the transmission of TBEV, we investigated tick infestation of rodents and the influence of microclimate on the seasonality of questing I. ricinus ticks. A 3-yr study was carried out at four sites, including two confirmed TBEV foci. Free-living ticks and rodents were collected monthly, and microclimatic data were recorded. A decrease in questing nymph density was observed in 2007, associated with low relative humidity and high temperatures in spring. One site, Thun, did not show this decrease, probably because of microclimatic conditions in spring that favored the questing nymph population. During the same year, the proportion of rodents carrying cofeeding ticks was lower at sites where the questing nymph density decreased, although the proportion of infested hosts was similar among years. TBEV was detected in 0.1% of questing ticks, and in 8.6 and 50.0% of larval ticks feeding on two rodents. TBEV was detected at all but one site, where the proportion of hosts with cofeeding ticks was the lowest. The proportion of hosts with cofeeding ticks seemed to be one of the factors that distinguished a TBEV focus from a non-TBEV focus. The enzootic cycle of TBEV might be disrupted when dry and hot springs occur during consecutive years.
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Affiliation(s)
- C Burri
- Institute of Biology, Laboratory of Eco-Epidemiology of Parasites, University of Neuchâtel, Emile-Argand 11, 2000 Neuch&tel, Switzerland
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Franceschetti A, Maeder G, Dolivo G, Blum JD. A propos de 3 cas de dysostose cranio-faciale (Crouzon). Stereotact Funct Neurosurg 2007. [DOI: 10.1159/000105350] [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: 11/19/2022]
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Franceschetti A, Maeder G. Hémiatrophie faciale avec alopécie (syndrome de Romberg) associée à une cyclite hétérochromique (syndrome de Fuchs). Stereotact Funct Neurosurg 2007. [DOI: 10.1159/000105085] [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: 11/19/2022]
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Hopfe V, Spitzl R, Dani I, Maeder G, Roch L, Rogler D, Leupolt B, Schoeneich B. Remote Microwave PECVD for Continuous, Wide-Area Coating Under Atmospheric Pressure. ACTA ACUST UNITED AC 2005. [DOI: 10.1002/cvde.200406352] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Hopfe V, Rogler D, Maeder G, Dani I, Landes K, Theophile E, Dzulko M, Rohrer C, Reichhold C. Linear Extended ArcJet-CVD - a New PECVD Approach for Continuous Wide Area Coating Under Atmospheric Pressure. ACTA ACUST UNITED AC 2005. [DOI: 10.1002/cvde.200406343] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Aubry A, Armanet F, Beranger G, Lebrun J, Maeder G. Measurement of residual stresses by X-ray diffraction in a system obtained by high temperature oxidation. ACTA ACUST UNITED AC 1988. [DOI: 10.1016/0001-6160(88)90124-1] [Citation(s) in RCA: 28] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Barral M, Lebrun JL, Sprauel JM, Maeder G. X-ray macrostress determination on textured material; use of the ODF for calculating the X-ray compliances. ACTA ACUST UNITED AC 1987. [DOI: 10.1007/bf02647192] [Citation(s) in RCA: 56] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Agnel A, Hedin F, Maeder G, Servant C, Lacombe P. Etude par diffusion des rayons X aux petits angles des zones formees dans les alliages Fe-16,4Ni-8,2Mo ET Fe-15,4Ni-10,2Mo. ACTA ACUST UNITED AC 1977. [DOI: 10.1016/0001-6160(77)90075-x] [Citation(s) in RCA: 5] [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: 10/27/2022]
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Maeder G. [On the physician's competence in ophthalmology]. Rev Med Suisse Romande 1970; 90:885-9. [PMID: 5509270] [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: 01/15/2023]
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Maeder G. [Remarks on the lamellar scleral resection with implantation of a polyethylene tube; Technique of Schepens]. Bibl Ophthalmol 1957; 12:455-9. [PMID: 13382774] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 03/06/2023]
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Franceschetti A, Maeder G. [Acute dystrophy of the cornea in a case of congenital ichthyosis]. Bull Mem Soc Fr Ophtalmol 1954; 67:146-9; discussion, 149-50. [PMID: 13284581] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 03/06/2023]
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Franceschetti A, Maeder G. Cataracte et affections cutanées du typePoïkilodermie (Syndrome de Rothmund) et du type Sclérodermie (Syndrome de Werner). Ophthalmologica 1949; 117:196-8. [DOI: 10.1159/000300664] [Citation(s) in RCA: 4] [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: 11/19/2022]
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Maeder G. Premiers résultats de la cyclo-diathermo-coagulation non-perforante dans le glaucome. Ophthalmologica 1948. [DOI: 10.1159/000300602] [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: 11/19/2022]
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Maeder G, Danis P. Sur une nouvelle forme de dystrophie cornéenne (dystrophia filiformis profunda corneae) associée à un kératocône. Ophthalmologica 1947. [DOI: 10.1159/000300475] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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