Although several genetic factors have been implicated as determinants of blood folate concentration in various populations, their effect on folate status in the Czech population has not yet been examined. We explored whether blood folate concentrations in healthy Czech population are associated with polymorphisms in 5,10-methylenetetrahydrofolate
reductase (MTHFR), folate hydrolase 1 (FOLH1), reduced folate carrier (RFC), and folate receptor (FOLR1) genes. In a cross-sectional study of 591 control subjects we determined genotypes by PCR-RFLP or ARMS-PCR methods, and plasma and erythrocyte folates by MEIA. The effect of different genotypes on folate status was examined by
non-parametric tests and by regression analysis. The prevalence of the MTHFR 677C>T, MTHFR 1298A>C, FOLH1 1561C>T, RFC 80G>A and FOLR1 480G>C variant alleles was 0.34, 0.33, 0.05, 0.44 and 0.00, respectively. Only the MTHFR 677C>T variant was significantly associated with plasma folate concentrations (median 14.7, 14.0 and 12.2 nmol/l for the CC, CT and TT genotypes, respectively). Our study showed that among the five studied allelic variants, only the 677C>T polymorphism in the MTHFR gene is a significant genetic determinant of plasma folate concentrations in Czech population.
Cíl studie: Doposud používaný ABI PRISM 7700 sekvenční detekční systém se již přestal vyrábět, řada laboratoří je proto nucena převést dosavadní neinvazivní prenatální diagnostiku na nové přístrojové vybavení. V této studii se zaměřujeme na testování použití 7300 real-time PCR systému pro účely rutinního neinvazivního určení pohlaví, RHD a RHCE genotypu plodu. Název a sídlo pracoviště: Laboratoř buněčné biologie, Pediatrická klinika, 2. LF UK a FN Motol Praha. Materiál a metody: Hodnotíme amplifikaci paternálních alel na extracelulární DNA izolované z mateřské periferní krve pomocí QIAamp DSP Virus kitu (c a E alely RHCE genu) a QIAamp DNA Blood Mini kitu (SRY, RHD a C alela RHCE genů) u 22 těhotných žen v rozmezí 10.–38. týdne gravidity. Výsledky: SRY (n = 6), RHD (exon 7 a exon 10, n = 7) a RHCE (C alela, n = 3; c alela, n = 3; E alela, n = 3) genotypizace plodu provedené na 7300 real-time PCR systému byly ve shodě s pohlavím a Rh fenotypem plodu či narozeného dítěte u všech vyšetřených těhotných žen. Závěr: Prokázali jsme, že 7300 real-time PCR systém je dostatečně citlivý pro detekci paternálních alel na fetální DNA přítomné v extracelulární DNA izolované z mateřské plazmy. Tímto způsobem můžeme nadále i po vyřazení ABI PRISM 7700 sekvenčního detekčního systému z provozu zajišťovat spolehlivé neinvazivní určení pohlaví plodu u těhotenství s rizikem X-vázaných onemocnění u plodu a neinvazivní RHD a RHCE genotypizaci plodu u aloimunizovaných těhotenství s rizikem fetální erytroblastózy., Objective: Since ABI PRISM 7700 sequence detection system has not already been commercially available, quite a number of laboratories are obliged to perform actual non-invasive prenatal diagnosis from maternal peripheral blood on new equipment. The purpose of this study was to test the usage of 7300 real-time PCR system for the purpose of routine non-invasive fetal sex determination and fetal RHD and RHCE genotyping. Settings: Cell Biology Laboratory, Paediatric Clinic, 2nd Medical Faculty and University Hospital Motol Prague. Material and Methods: We evaluated paternal allele amplification on extracellular DNA isolated from maternal peripheral blood by using QIAamp DSP Virus kit (c and E alleles of RHCE gene) and QIAamp DNA Blood Mini kit (SRY, RHD and C allele of RHCE gene) in a cohort of 22 pregnant women within 10th and 38th week of pregnancy. Results: The results of fetal SRY (n = 6), RHD (exon 7 and exon 10, n = 7) and RHCE (C allele, n = 3; c allele, n = 3; E allele, n = 3) genotyping performed on 7300 real-time PCR system corresponded to sex and/or Rh phenotype of the foetus or the newborn in all tested pregnant women. We showed that 7300 real-time PCR system is sensitive enough for paternal allele detection performed on fetal DNA fraction within extracellular DNA isolated from maternal plasma. Conclusion: After ABI PRISM 7700 sequence detection system would be completely taken out of service, we would be able henceforth to provide reliable non-invasive fetal sex determination in pregnancies at risk of X-linked disorders and non-invasive fetal RHD and RHCE genotyping in alloimmunized pregnancies at risk of haemolytic disease of newborn., Ilona Hromadníková, K. Veselá, R. Schrollová, and Lit. 18