multiplex detection Dotaz Zobrazit nápovědu
Multiplex PCR is one of the many variants routinely performed by polymerase chain reaction (PCR). Its advantage is especially rapid detection of a large number of products in one reaction using multiple primer sets. Optimization of the multiplex PCR protocol is important also for genes of metallothionein isoforms, so that we can carry out the amplification of more than one DNA sequence. Necessary part of this proces is the adjustments in temperature during the reaction steps and also intervention with the changes in the concentration of individual reagents and different combinations or the amount of each primer.
Cíl studie: Rychlá detekce nejčastějších aneuploidií pomocí metody multiplex QF PCR na nekultivovaných vzorcích choriové tkáně. Shrnutí výsledků aplikace multiplex QF PCR v managmentu péče o těhotné ženy v prvním trimestru gravidity. Typ studie: Původní práce. Název a sídlo pracoviště: Ústav lékařské genetiky a fetální medicíny FN a LF UP, Olomouc. Metodika: Vzorky choriové tkáně byly získány od 101 gravidních žen. Nekultivované vzorky byly zpracovány metodou multiplex QF PCR. Analyzovány byly STR lokusy chromozomů 13, 18, 21 a X, Y. Tyto markery byly amplifikovány ve 2 oddělených multiplex PCR reakcích za stejných podmínek a podrobeny fragmentační analýze v kapilární elektroforéze. Výsledky: Všech 101 analyzovaných vzorků choriové tkáně bylo úspěšně amplifikováno. V tomto souboru bylo metodou multiplex QF PCR celkem detekováno 16 patologií u plodů. Ve dvou případech se jednalo o triploidii, v sedmi případech byla zachycena trizomie chromozomu 21 – Downův syndrom, v šesti případech pak trizomie chromozomu 18 – Edwardsův syndrom a jednou byla odhalena monozomie gonozomu X – Turnerův syndrom. Závěr: Metoda multiplex QF PCR je nedílnou součástí screeningu prvního trimestru a poskytuje rychle dostupný a spolehlivý výsledek u vyšetřovaných pacientek.
Objective: Rapid detection of most frequent aneuploidies by the multiplex QF PCR method in non-cultured samples of chorial tissue. Summarized results of QF PCR method applied in the management of care of pregnant women in the first trimester of pregnancy. Type of study: An original contribution. Setting: Institute of Medical Genetics and Fetal Medicine, Faculty Hospital and Medical Faculty, Palacky University Olomouc. Methods: The samples of chorial tissue were obtained from 101 pregnant women. Non-cultured samples were processed by the multiplex QF PCR method. STR loci of chromosomes 13, 18, 21 and X and Y were analyzed. These markers were amplified in two separate multiplex PCR reactions under the same conditions and subjected to fragmentation analysis in capillary electrophoresis. Results: All 101 analyzed samples of chorial tissue were successfully amplified. In this group, 16 pathologies of the fetuses were detected by the multiplex QF PCR method. Triploidy was detected in two cases, trisomy of chromosome 21 – Down syndrome was found in seven cases, and trisomy of chromosome 18 – Edwards syndrome was found in six cases and monosomy of gonosome X – the Turner’ s syndrome was revealed once. Conclusions: The multiplex QF PCR method is an indispensable part of the screening of the first trimester and provides a rapidly available and reliable result in the examined patients.
- MeSH
- aneuploidie MeSH
- cytogenetické vyšetření metody trendy využití MeSH
- finanční podpora výzkumu jako téma MeSH
- genetické testování etika metody MeSH
- lidé MeSH
- polymerázová řetězová reakce metody využití MeSH
- prenatální diagnóza metody trendy využití MeSH
- první trimestr těhotenství genetika MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- srovnávací studie MeSH
The authors presei.t the case of non-HIV Kaposi's sarcoma treated successfully with Vinblastin (10 mg/m2 at two-week intervals to a total dose of 35 mg/m ), subsequently with interferon α-2b (5 million units s.c. three times per week for 16 weeks). After two years remission a complete relapse of KS occurred. Complete remission occurred again after repeated interferon α-2b treatment 5 million units three times per week for eight weeks, raised to 10 million units three times per week, repeatedly reduced to 5 million units three times per week up to a total 6-month period of administration. From the diagnostic aspect the authors draw attention to the importance of immunohistochemical examination using detection of CD34 antigen on endothelial and perivascular KS cells. In the discussion the authors draw attention to the virus etiology of KS HIV-positive and non-HIV (HHV 8), which explains the successful treatment with interferon α-2b in these conditions.
- MeSH
- dospělí MeSH
- farmakoterapie metody MeSH
- imunohistochemie metody MeSH
- interferon alfa aplikace a dávkování terapeutické užití MeSH
- Kaposiho sarkom klasifikace patologie terapie MeSH
- lidé MeSH
- recidiva patologie MeSH
- Check Tag
- dospělí MeSH
- lidé MeSH
- mužské pohlaví MeSH
- Publikační typ
- kazuistiky MeSH
Ciele: Analýza prenatálnych vzoriek za obdobie 2015–2020. Porovnanie miery detekcie klinicky relevantných variant cytogenetickou analýzou karyotypu a cytogenomickými metódami MLPA (Multiplex Ligation-Depent Probe Amplification) a mikročipmi (CMA – chromosomal microarray). Súbor a metodika: Analyzovaných bolo 1 029 prenatálnych vzoriek cytogenetickým hodnotením karyotypu (n = 1 029), cytogenomickými metódami MLPA (n = 144) a CMA (n = 111). Všetky nebalansované zmeny boli potvrdené metódou MLPA alebo CMA. Výsledky: Z analyzovaného súboru plodov, po odčítaní aneuploidií – 107 (10,40 %, n = 1 029), bolo analýzou karyotypu zachytených 22 štruktúrnych aberácií (2,39 %, n = 922) – deväť nebalansovaných zmien (0,98 %), 10 balansovaných zmien (1,08 %), jeden prípad nejasnej mozaiky (0,09 %), jeden prípad prítomnosti marker chromozómu (0,09 %) a jeden prípad diskordancie pohlavia (0,09 %). U 255 vzoriek s fyziologickým karyotypom indikovaných k cytogenomickému vyšetreniu bolo zachytených celkom osem (7,21 %, n = 111) patologických variant metódou CMA. Metódou MLPA bolo z týchto ôsmich patogénnych variant zachytených päť (3,47 %, n = 144). Celkový záchyt patogénnych variant metódami MLPA a CMA vrátane konfirmačných vyšetrení patologického karyotypu je 14 (5,14 %) a 17 (6,25 %) (n = 272). Záchyt patologických variant v skupine s izolovanými poruchami bol nižší než v skupine s mnohopočetnými poruchami (5,08 vs. 21,42 %). Záver: Potvrdila sa vyššia úspešnosť záchytu patologických variant so zmenou v počte kópií, metódou CMA než MLPA.
Objective: Analysis of prenatal samples from 2015 to 2020. Comparison detection rates of clinically relevant variants by cytogenetic karyotype analysis and cytogenomic MLPA (Multiplex Ligation-Depent Probe Amplification) and microarray methods (CMA – chromosomal microarray). Material and method: 1,029 prenatal samples were analyzed by cytogenetic karyotyping (N = 1,029), cytogenomic methods – MLPA (N = 144) and CMA (N = 111). All unbalanced changes were confirmed by MLPA or CMA. Results: From the analyzed set of fetuses, after subtraction of aneuploidies – 107 (10.40%, N = 1,029), 22 structural aberrations (2.39%, N = 922) – nine unbalanced changes (0.98%), 10 balanced changes (1.08%), one case of unclear mosaicism (0.09%), one case of presence of a marker chromosome (0.09%) and one case of sex discordance (0.09%) – were detected by karyotype analysis. A total of eight (7.21%, N = 111) pathological variants were detected by CMA in 255 samples with physiological karyotype indicated for cytogenomic examination. Five (3.47%, N = 144) of eight pathogenic variants were detected by MLPA method. The total capture of pathogenic variants by MLPA and CMA methods was 14 (5.14%) and 17 (6.25%) (N = 272), including confirmatory pathological karyotype testing. Detection of pathological variants in the isolated disorders group was lower than in the multiple disorders group (5.08 vs. 21.42%). Conclusion: A higher success rate for the detection of pathological copy number variation variants by the microarray method than by the MLPA method was confirmed.
- MeSH
- klinická studie jako téma MeSH
- lidé MeSH
- mikročipová analýza metody MeSH
- mozaicismus MeSH
- multiplexová polymerázová řetězová reakce metody MeSH
- plod MeSH
- prenatální diagnóza * MeSH
- těhotenství MeSH
- variabilita počtu kopií segmentů DNA MeSH
- vrozené vady * diagnóza genetika MeSH
- Check Tag
- lidé MeSH
- těhotenství MeSH
- ženské pohlaví MeSH
Since its invention in 1985 the polymerase chain reaction (PCR) has become a well-established method for amplification and detection of segments of double-stranded DNA. Incorporation of fluorogenic probe or DNA intercalating dyes (such as SYBR Green) into the PCR mixture allowed real-time reaction monitoring and extraction of quantitative information (qPCR). Probes with different excitation spectra enable multiplex qPCR of several DNA segments using multi-channel optical detection systems. Here we show multiplex qPCR using an economical EvaGreen-based system with single optical channel detection. Previously reported non quantitative multiplex real-time PCR techniques based on intercalating dyes were conducted once the PCR is completed by performing melting curve analysis (MCA). The technique presented in this paper is both qualitative and quantitative as it provides information about the presence of multiple DNA strands as well as the number of starting copies in the tested sample. Besides important internal control, multiplex qPCR also allows detecting concentrations of more than one DNA strand within the same sample. Detection of the avian influenza virus H7N9 by PCR is a well established method. Multiplex qPCR greatly enhances its specificity as it is capable of distinguishing both haemagglutinin (HA) and neuraminidase (NA) genes as well as their ratio.
- MeSH
- fluorescenční barviva * MeSH
- kvantitativní polymerázová řetězová reakce * MeSH
- multiplexová polymerázová řetězová reakce přístrojové vybavení metody MeSH
- ptačí chřipka u ptáků diagnóza virologie MeSH
- ptáci MeSH
- virus chřipky A klasifikace genetika MeSH
- zvířata MeSH
- Check Tag
- zvířata MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
Multiplex oligonucleotide ligation-PCR (MOL-PCR) is a rapid method for simultaneous detection of multiple molecular markers within a single reaction. MOL-PCR is increasingly employed in microbial detection assays, where its ability to facilitate identification and further characterization via simple analysis is of great benefit and significantly simplifies routine diagnostics. When adapted to microsphere suspension arrays on a MAGPIX reader, MOL-PCR has the potential to outperform standard nucleic acid-based diagnostic assays. This study represents the guideline towards in-house MOL-PCR assay optimization using the example of foodborne pathogens (bacteria and parasites) with an emphasis on the appropriate choice of crucial parameters. The optimized protocol focused on specific sequence detection utilizes the fluorescent reporter BODIPY-TMRX and self-coupled magnetic microspheres and allows for a smooth and brisk workflow which should serve as a guide for the development of MOL-PCR assays intended for pathogen detection.
- MeSH
- infekce yersiniemi diagnóza mikrobiologie MeSH
- lidé MeSH
- multiplexová polymerázová řetězová reakce metody MeSH
- nemoci přenášené potravou diagnóza mikrobiologie parazitologie MeSH
- Toxoplasma genetika izolace a purifikace MeSH
- toxoplazmóza diagnóza parazitologie MeSH
- Yersinia enterocolitica genetika izolace a purifikace MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
The increase of mixed chimerism (MC) after allogeneic hematopoietic stem cell transplantation has been associated with a high risk of relapse. A variety of techniques that use polymorphic markers have been established to survey hematopoietic chimerism status. The highest sensitivity is achieved using real-time quantitative polymerase chain reaction (RQ-PCR) analysis of insertion/deletion polymorphism, which allows the detection of disease recurrence and subsequently the earlier initiation of therapeutic intervention. The purpose of this study is the evaluation of multiplex RQ-PCR for MC assessment (six biallelic genetic systems and Y-specific locus), allowing the amplification and detection of target gene of interest and glyceraldehyde-3-phosphate dehydrogenase reference housekeeping gene in a single microtube. With optimized amounts of primers and probe, the quantification of target DNA was shown to be linear throughout the tested range (100%-0.05%). The efficiencies of multiplex RQ-PCR were in a range of 0.89 to 1.07. The sensitivity of individual systems ranged 0.02% to 0.04% with an average of 0.034%. A high degree of linear correlation between the chimerism results obtained by multiplex RQ-PCR vs singleplex RQ-PCR was observed (P < 0.0001, Spearman's coefficient = 0.9927), while correlation between multiplex RQ-PCR vs short tandem repeat analysis was also statistically significant (P < 0.0001, Spearman's coefficient = 0.9769). This new multiplex RQ-PCR assay is a quick, sensitive, reproducible, and cost-effective method for accurate MC assessment.
- MeSH
- alely MeSH
- chimérismus * MeSH
- DNA primery MeSH
- leukemie terapie MeSH
- lidé MeSH
- lokální recidiva nádoru diagnóza etiologie prevence a kontrola MeSH
- multiplexová polymerázová řetězová reakce metody MeSH
- polymerázová řetězová reakce s reverzní transkripcí metody MeSH
- polymorfismus genetický * MeSH
- transplantace hematopoetických kmenových buněk škodlivé účinky MeSH
- transplantační chiméra krev genetika MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
