Microarray with LNA-probes for genotyping of polymorphic variants of Gilbert’s syndrome gene UGT1A1(TA)n
-
Eugeny E. Fesenko
, Rustam N. Heydarov
Abstract
Background: Gilbert’s syndrome is a common metabolic dysfunction characterized by elevated levels of unconjugated bilirubin in the bloodstream. This condition is usually caused by additional (TA) insertions in a promoter region of the uridine diphosphate glucuronosyltransferase 1A1 (UGT1A1) gene, which instead of the sequence А(TА)6TАА contains А(TА)7TАА. While the condition itself is benign, it presents elevated risk for patients treated with irinotecan, a common chemotherapy drug.
Methods: The technique is based on hybridization analysis of a pre-amplified segment of the UGT1A1 gene promoter performed on a microarray. Specific probes containing locked nucleic acids (LNA) were designed and immobilized on the microarray to provide accurate identification.
Results: A microarray has been developed to identify both common and rare variants of UGT1A1(TA)n polymorphisms. In total, 108 individuals were genotyped. Out of these, 47 (43.5%) had homozygous wild-type genotypes (TA)6/(TA)6; 41(38%) were heterozygotes (TA)6/(TA)7; and 18 (16.7%) – homozygotes (TA)7/(TA)7. In two cases (1.8%), rare genotypes (TA)5/(TA)7and (TA)5/(TA)6were found. The results were in full agreement with the sequencing. In addition, synthetic fragments corresponding to all human allelic variants [(TA)5, (TA)6, (TA)7, (TA)8] were successfully tested.
Conclusions: The developed microarray-based approach for identification of polymorphic variants of the UGT1A1 gene is a promising and reliable diagnostic tool that can be successfully implemented in clinical practice.
This work was partially supported by contract No. 16.512.11.2042 with the Federal Agency of Sciences and Innovations of the Russian Federation. We are grateful to E. Chernoglazova for clinical data, to E. Kreindlin for manufacturing the microarrays, to S. Surzhikov and O. Ivashkina for the synthesis of oligonucleotides and to V. Chechetkin for his help with the mathematical calculations and analysis of experimental data. We are especially grateful to A. Kolchinsky for his assistance in the preparation of this paper.
Conflict of interest statement
Authors’ conflict of interest disclosure: The authors stated that there are no conflicts of interest regarding the publication of this article.
Research funding: Partially supported by contract No. 16.512.11.2042 with the Federal Agency of Sciences and Innovations of the Russian Federation.
Employment or leadership: None declared.
Honorarium: None declared.
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Artikel in diesem Heft
- Letters to the Editor
- Evaluation of a novel room temperature RNA storage tube for use in a real-time quantitative PCR assay
- Evaluation of the Universal Master Mix (STAT-NAT DNA-Mix) for reliable molecular testing
- HbA1c: performance of the Sebia Capillarys 2 Flex Piercing
- A case of monoclonal gammopathy of undetermined significance (MGUS): type IgD-lambda
- Evidence-based use of serum protein electrophoresis in laboratory medicine
- Plasma volume shifts during multiday racing
- Structured handoff at shift change in a clinical laboratory increases patient safety
- Instrument-dependent interference of Howell-Jolly bodies in reticulocyte enumeration
- Reply to Gore et al.: Plasma volume shift during multiday racing
- Recommendations for appropriate serum electrophoresis requests: the Italian approach
- Masthead
- Masthead
- Editorials
- Biomarkers for sepsis: an unfinished journey
- Laboratory demand management of repetitive testing – time for harmonisation and an evidenced based approach
- Reviews
- Non-invasive prenatal diagnostics of aneuploidy using next-generation DNA sequencing technologies, and clinical considerations
- The diagnostic utility of brain natriuretic peptide in heart failure patients presenting with acute dyspnea: a meta-analysis
- Opinion Paper
- Opinion paper on innovative approach of biomarkers for infectious diseases and sepsis management in the emergency department
- Genetics and Molecular Diagnostics
- Microarray with LNA-probes for genotyping of polymorphic variants of Gilbert’s syndrome gene UGT1A1(TA)n
- Selection of the optimal manual method of cell free fetal DNA isolation from maternal plasma
- A multiplex assay to rapidly exclude HLA-DQ2.5 and HLA-DQ8 expression in patients at risk for celiac disease
- Low cost biosensor-based molecular differential diagnosis of α-thalassemia (Southeast Asia deletion)
- General Clinical Chemistry and Laboratory Medicine
- Managing laboratory test ordering through test frequency filtering
- Critical review of laboratory investigations in clinical practice guidelines: proposals for the description of investigation
- Long-term stability of laboratory tests and practical implications for quality management
- Coffee consumption, serum γ-glutamyltransferase, and glucose tolerance status in middle-aged Japanese men
- Biological variation and prognosis usefulness of new biomarkers in liver transplantation
- Switching between parathormone (PTH) assays: the impact on the diagnosis of renal osteodystrophy
- A comparison between two different in vitro basophil activation tests for gluten- and cow’s milk protein sensitivity in irritable bowel syndrome (IBS)-like patients
- A proficiency testing program of hemoglobin analysis in prevention and control of severe hemoglobinopathies in Thailand
- Advancing haemostasis automation – successful implementation of robotic centrifugation and sample processing in a tertiary service hospital
- ADAM12s and PP13 as first trimester screening markers for adverse pregnancy outcome
- Analysis of serous body fluids using the CELL-DYN Sapphire hematology analyzer
- Cancer Diagnostics
- Association and prognostic value of serum inflammation markers in patients with leukoplakia and oral cavity cancer
- Do laboratories follow heart failure recommendations and guidelines and did we improve? The CARdiac MArker Guideline Uptake in Europe (CARMAGUE)
- Cardiovascular Diseases
- Additional diagnostic and prognostic value of copeptin ultra-sensitive for diagnosis of non-ST-elevation myocardial infarction in older patients presenting to the emergency department1)
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