uu.seUppsala University Publications
Change search
Link to record
Permanent link

Direct link
Kohnke, Hugo
Publications (3 of 3) Show all publications
Hallberg, P., Smedje, H., Eriksson, N., Kohnke, H., Daniilidou, M., Öhman, I., . . . Wadelius, M. (2019). Pandemrix-induced narcolepsy is associated with genes related to immunity and neuronal survival. EBioMedicine, 40, 595-604
Open this publication in new window or tab >>Pandemrix-induced narcolepsy is associated with genes related to immunity and neuronal survival
Show others...
2019 (English)In: EBioMedicine, E-ISSN 2352-3964, Vol. 40, p. 595-604Article in journal (Refereed) Published
Abstract [en]

BACKGROUND: The incidence of narcolepsy rose sharply after the swine influenza A (H1N1) vaccination campaign with Pandemrix. Narcolepsy is an immune-related disorder with excessive daytime sleepiness. The most frequent form is strongly associated with HLA-DQB1*06:02, but only a minority of carriers develop narcolepsy. We aimed to identify genetic markers that predispose to Pandemrix-induced narcolepsy.

METHODS: We tested for genome-wide and candidate gene associations in 42 narcolepsy cases and 4981 controls. Genotyping was performed on Illumina arrays, HLA alleles were imputed using SNP2HLA, and single nucleotide polymorphisms were imputed using the haplotype reference consortium panel. The genome-wide significance threshold was p < 5 × 10-8, and the nominal threshold was p < 0.05. Results were replicated in 32 cases and 7125 controls. Chromatin data was used for functional annotation.

FINDINGS: Carrying HLA-DQB1*06:02 was significantly associated with narcolepsy, odds ratio (OR) 39.4 [95% confidence interval (CI) 11.3, 137], p = 7.9 × 10-9. After adjustment for HLA, GDNF-AS1 (rs62360233) was significantly associated, OR = 8.7 [95% CI 4.2, 17.5], p = 2.6 × 10-9, and this was replicated, OR = 3.4 [95% CI 1.2-9.6], p = 0.022. Functional analysis revealed variants in high LD with rs62360233 that might explain the detected association. The candidate immune-gene locus TRAJ (rs1154155) was nominally associated in both the discovery and replication cohorts, meta-analysis OR = 2.0 [95% CI 1.4, 2.8], p = 0.0002.

INTERPRETATION: We found a novel association between Pandemrix-induced narcolepsy and the non-coding RNA gene GDNF-AS1, which has been shown to regulate expression of the essential neurotrophic factor GDNF. Changes in regulation of GDNF have been associated with neurodegenerative diseases. This finding may increase the understanding of disease mechanisms underlying narcolepsy. Associations between Pandemrix-induced narcolepsy and immune-related genes were replicated.

(MeSH), Autoimmune diseases, Drug-related side effects and adverse reactions, Genetic variation, Genome-wide association study, Glial cell line-derived neurotrophic factor, H1N1 subtype, Influenza A virus, Influenza vaccines, Narcolepsy, Pharmacogenetics, RNA, long noncoding
National Category
urn:nbn:se:uu:diva-377169 (URN)10.1016/j.ebiom.2019.01.041 (DOI)000460696900067 ()30711515 (PubMedID)
Swedish Research Council, 521-2011-2440Swedish Research Council, 521-2014-3370Swedish Research Council, 2018-03307Swedish Heart Lung Foundation, 20120557Swedish Heart Lung Foundation, 20140291Swedish Heart Lung Foundation, 20170711Erik, Karin och Gösta Selanders FoundationThuréus stiftelse för främjande av geriatrisk forskningSwedish Research Council, 2017-00641
Available from: 2019-02-15 Created: 2019-02-15 Last updated: 2019-05-13Bibliographically approved
Wadelius, M., Eriksson, N., Kreutz, R., Bondon-Guitton, E., Ibañez, L., Carvajal, A., . . . Hallberg, P. (2018). Sulfasalazine-Induced Agranulocytosis Is Associated With the Human Leukocyte Antigen Locus.. Clinical Pharmacology and Therapeutics, 103(5), 843-853
Open this publication in new window or tab >>Sulfasalazine-Induced Agranulocytosis Is Associated With the Human Leukocyte Antigen Locus.
Show others...
2018 (English)In: Clinical Pharmacology and Therapeutics, ISSN 0009-9236, E-ISSN 1532-6535, Vol. 103, no 5, p. 843-853Article in journal (Refereed) Published
Abstract [en]

Agranulocytosis is a serious, although rare, adverse reaction to sulfasalazine, which is used to treat inflammatory joint and bowel disease. We performed a genome‐wide association study comprising 9,380,034 polymorphisms and 180 HLA alleles in 36 cases of sulfasalazine‐induced agranulocytosis and 5,170 population controls. Sulfasalazine‐induced agranulocytosis was significantly associated with the HLA region on chromosome 6. The top hit (rs9266634) was located close to HLA‐B, odds ratio (OR) 5.36 (95% confidence interval (CI) (2.97, 9.69) P = 2.55 × 10−8). We HLA‐sequenced a second cohort consisting of 40 cases and 142 treated controls, and confirmed significant associations with HLA‐B*08:01, OR = 2.25 (95% CI (1.02, 4.97) P = 0.0439), in particular the HLA‐B*08:01 haplotype HLA‐DQB1*02:01‐DRB1*03:01‐B*08:01‐C*07:01, OR = 3.79 (95% CI (1.63, 8.80) P = 0.0019), and with HLA‐A*31:01, OR = 4.81 (95% CI (1.52, 15.26) P = 0.0077). The number needed to test for HLA‐B*08:01 and HLA‐A*31:01 to avoid one case was estimated to be 1,500. We suggest that intensified monitoring or alternative treatment should be considered for known carriers of HLA‐B*08:01 or HLA‐A*31:01.

National Category
Clinical Laboratory Medicine
Research subject
Clinical Pharmacology
urn:nbn:se:uu:diva-342623 (URN)10.1002/cpt.805 (DOI)000430118300025 ()28762467 (PubMedID)
Science for Life Laboratory - a national resource center for high-throughput molecular bioscienceSwedish Research Council, 521-2014-3370; 521-2011-2440Swedish Heart Lung Foundation, 20120557; 20140291
Available from: 2018-02-22 Created: 2018-02-22 Last updated: 2018-06-19Bibliographically approved
Howard, R., Leathart, J. B., French, D. J., Krishan, E., Kohnke, H., Wadelius, M., . . . Barallon, R. (2011). Genotyping for CYP2C9 and VKORC1 alleles by a novel point of care assay with HyBeacon® probes. Clinica Chimica Acta, 412(23-24), 2063-2069
Open this publication in new window or tab >>Genotyping for CYP2C9 and VKORC1 alleles by a novel point of care assay with HyBeacon® probes
Show others...
2011 (English)In: Clinica Chimica Acta, ISSN 0009-8981, E-ISSN 1873-3492, Vol. 412, no 23-24, p. 2063-2069Article in journal (Refereed) Published
Abstract [en]

BACKGROUND: Coumarin anticoagulants such as warfarin are used to treat and prevent thromboembolic events in patients. The required dosage is difficult to predict and the risk of over or under anticoagulation are dependent on several environmental and clinical factors, such as concurrent medication, diet, age and genotype for polymorphisms in two genes CYP2C9 and VKORC1.

METHODS: A novel fluorescent PCR genotyping assay using HyBeacon® probes, was developed to enable clinical staff to genotype the CYP2C9*2 and CYP2C9*3 alleles and the VKORC1 G-1639A polymorphism directly from unextracted blood samples. A prototype PCR instrument, Genie 1, suitable for point of care use was developed to carry out the assays. The panel of tests was validated by analysing blood samples from 156 individuals and comparing genotypes with data obtained using DNA samples from the same individuals. The accuracy of genotypes obtained with the Genie 1 was compared against results from well validated real time PCR and PCR-restriction fragment length polymorphism analysis.

RESULTS: Identical results were obtained for the newly developed HyBeacon® method and the validation method in all cases except for one where no result was obtained for the VKORC1 polymorphism on the Genie instrument. The samples used for validation represented all six possible *2 and *3 allele-related CYP2C9 genotypes and all three VKORC1 G-1639A genotypes.

CONCLUSIONS: We observed excellent accuracy for the newly developed method which can determine genotype in less than 2 h.

Warfarin, Phenprocoumon, Acenocoumarol, CYP2C9, VKORC1, Point of care genotyping
National Category
Pharmacology and Toxicology Biomedical Laboratory Science/Technology
urn:nbn:se:uu:diva-163037 (URN)10.1016/j.cca.2011.07.013 (DOI)000296686100008 ()21827742 (PubMedID)
Swedish Research Council
Available from: 2011-12-07 Created: 2011-12-07 Last updated: 2018-01-12

Search in DiVA

Show all publications