Massively parallel sequencing of DNA molecules in the plasma of pregnant women has been shown to allow accurate and noninvasive prenatal detection of fetal trisomy 21. However, whether the sequencing ...approach is as accurate for the noninvasive prenatal diagnosis of trisomy 13 and 18 is unclear due to the lack of data from a large sample set. We studied 392 pregnancies, among which 25 involved a trisomy 13 fetus and 37 involved a trisomy 18 fetus, by massively parallel sequencing. By using our previously reported standard z-score approach, we demonstrated that this approach could identify 36.0% and 73.0% of trisomy 13 and 18 at specificities of 92.4% and 97.2%, respectively. We aimed to improve the detection of trisomy 13 and 18 by using a non-repeat-masked reference human genome instead of a repeat-masked one to increase the number of aligned sequence reads for each sample. We then applied a bioinformatics approach to correct GC content bias in the sequencing data. With these measures, we detected all (25 out of 25) trisomy 13 fetuses at a specificity of 98.9% (261 out of 264 non-trisomy 13 cases), and 91.9% (34 out of 37) of the trisomy 18 fetuses at 98.0% specificity (247 out of 252 non-trisomy 18 cases). These data indicate that with appropriate bioinformatics analysis, noninvasive prenatal diagnosis of trisomy 13 and trisomy 18 by maternal plasma DNA sequencing is achievable.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
Fetal DNA is present in the plasma of pregnant women. Massively parallel sequencing of maternal plasma DNA has been used to detect fetal trisomies 21, 18, 13 and selected sex chromosomal aneuploidies ...noninvasively. Case reports describing the detection of fetal microdeletions from maternal plasma using massively parallel sequencing have been reported. However, these previous reports were either polymorphism-dependent or used statistical analyses which were confined to one or a small number of selected parts of the genome. In this report, we reported a procedure for performing noninvasive prenatal karyotyping at 3 Mb resolution across the whole genome through the massively parallel sequencing of maternal plasma DNA. This method has been used to analyze the plasma obtained from 6 cases. In three cases, fetal microdeletions have been detected successfully from maternal plasma. In two cases, fetal microduplications have been detected successfully from maternal plasma. In the remaining case, the plasma DNA sequencing result was consistent with the pregnant mother being a carrier of a microduplication. Simulation analyses were performed for determining the number of plasma DNA molecules that would need to be sequenced and aligned for enhancing the diagnostic resolution of noninvasive prenatal karyotyping to 2 Mb and 1 Mb. In conclusion, noninvasive prenatal molecular karyotyping from maternal plasma by massively parallel sequencing is feasible and would enhance the diagnostic spectrum of noninvasive prenatal testing.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
Objectives To validate the clinical efficacy and practical feasibility of massively parallel maternal plasma DNA sequencing to screen for fetal trisomy 21 among high risk pregnancies clinically ...indicated for amniocentesis or chorionic villus sampling.Design Diagnostic accuracy validated against full karyotyping, using prospectively collected or archived maternal plasma samples.Setting Prenatal diagnostic units in Hong Kong, United Kingdom, and the Netherlands.Participants 753 pregnant women at high risk for fetal trisomy 21 who underwent definitive diagnosis by full karyotyping, of whom 86 had a fetus with trisomy 21. Intervention Multiplexed massively parallel sequencing of DNA molecules in maternal plasma according to two protocols with different levels of sample throughput: 2-plex and 8-plex sequencing. Main outcome measures Proportion of DNA molecules that originated from chromosome 21. A trisomy 21 fetus was diagnosed when the z score for the proportion of chromosome 21 DNA molecules was >3. Diagnostic sensitivity, specificity, positive predictive value, and negative predictive value were calculated for trisomy 21 detection.Results Results were available from 753 pregnancies with the 8-plex sequencing protocol and from 314 pregnancies with the 2-plex protocol. The performance of the 2-plex protocol was superior to that of the 8-plex protocol. With the 2-plex protocol, trisomy 21 fetuses were detected at 100% sensitivity and 97.9% specificity, which resulted in a positive predictive value of 96.6% and negative predictive value of 100%. The 8-plex protocol detected 79.1% of the trisomy 21 fetuses and 98.9% specificity, giving a positive predictive value of 91.9% and negative predictive value of 96.9%.Conclusion Multiplexed maternal plasma DNA sequencing analysis could be used to rule out fetal trisomy 21 among high risk pregnancies. If referrals for amniocentesis or chorionic villus sampling were based on the sequencing test results, about 98% of the invasive diagnostic procedures could be avoided.
Noninvasive prenatal detection of fetal subchromosomal copy number aberrations (CNAs) can be achieved through massively parallel sequencing of maternal plasma DNA. However, when a mother herself is a ...carrier of a CNA, one cannot discern if her fetus has inherited the CNA. In addition, false-positive results would become more prevalent when more subchromosomal regions are analyzed.
We used a strategy that combined count- and size-based analyses of maternal plasma DNA for the detection of fetal subchromosomal CNAs in 7 target regions for 10 test cases.
For the 5 cases in which CNAs were present only in the fetus, the size-based approach confirmed the aberrations detected by the count-based approach. For the 5 cases in which the mother herself carried an aberration, we successfully deduced that 3 of the fetuses had inherited the aberrations and that the other 2 fetuses had not inherited the aberrations. No false positives were observed in this cohort.
Combined count- and size-based analysis of maternal plasma DNA permits the noninvasive elucidation of whether a fetus has inherited a CNA from its mother who herself is a carrier of the CNA. This strategy has the potential to improve the diagnostic specificity of noninvasive prenatal testing.
Hyperactive Wnt signaling is frequently observed in colorectal cancer. Higher intakes of dietary fiber nondigestible carbohydrates (NDCs) and the fermentation product butyrate are protective against ...colorectal cancer and may exert their preventative effects via modulation of the Wnt pathway.
We investigated the effects of supplementing healthy individuals with 2 NDCs resistant starch (RS) and polydextrose on fecal calprotectin concentrations and Wnt pathway-related gene expression. In addition, we determined whether effects on secreted frizzled-related protein 1 (SFRP1) expression are mediated via the epigenetic mechanisms DNA methylation and microRNA expression.
In a randomized, double-blind, placebo-controlled trial (the Dietary Intervention, Stem cells and Colorectal Cancer (DISC) Study), 75 healthy participants were supplemented with RS and/or polydextrose or placebo for 50 d in a 2 × 2 factorial design. Pre- and postintervention stool samples and rectal mucosal biopsies were collected and used to quantify calprotectin and expression of 12 Wnt-related genes, respectively. The expression of 10 microRNAs predicted to target SFRP1 was also quantified by quantitative reverse transcriptase-polymerase chain reaction, and DNA methylation was quantified at 7 CpG sites within the SFRP1 promoter region by pyrosequencing.
NDC supplementation did not affect fecal calprotectin concentration. SFRP1 mRNA expression was reduced by both RS (P = 0.005) and polydextrose (P = 0.053). RS and polydextrose did not affect SFRP1 methylation or alter the expression of 10 microRNAs predicted to target SFRP1. There were no significant interactions between RS and polydextrose.
RS and polydextrose supplementation did not affect fecal calprotectin concentrations. Downregulation of SFRP1 with RS and polydextrose could result in increased Wnt pathway activity. However, effects on Wnt pathway activity and downstream functional effects in the healthy large-bowel mucosa remain to be investigated. The DISC Study was registered at clinicaltrials.gov as NCT01214681.
Baicalein, a flavonoid compound, is one of the active constituents of the root of Scutellariae Radix. Baicalein inhibited
the growth of human lung squamous carcinoma CH27 cells in a dose-dependent ...manner. Cell cycle analysis revealed an increase
in the S-phase cell population following 24-h exposure to 50 μM baicalein. During the S-phase arrest, analysis of cell cycle
regulatory molecules demonstrated that baicalein decreased the levels of cdk 4, cyclin B1 and cyclin D1. Furthermore, baicalein
(50 μM) significantly induced cell apoptosis after 3 days of treatment. Baicalein induced apoptosis, as confirmed by condensed
nuclei and DNA fragmentation, in CH27 cells. Baicalein-induced apoptosis was also accompanied by a decrease in Bcl-2 and caspase-3
proform levels. These results suggest that baicalein inhibits the proliferation of CH27 cells via S-phase arrest and apoptosis.
Aim
Psychotic disorders incur substantial long‐term burdens to patients and society. Early intervention (EI) during the initial years of psychotic disorders can improve long‐term outcome. In Hong ...Kong, a pilot EI programme (EASY, Early Assessment Service for Young people with psychosis) had been set up since 2001 to serve clients under 25 years of age. Although EASY has been effective in improving outcome, consolidation of early psychosis work requires further development.
Methods
The present paper describes a new EI development which targets adult patients with psychosis in Hong Kong. The Jockey Club Early Psychosis (JCEP) project was launched in 2009. Expanding the service to patients above 25 years old, JCEP aims to deliver a territory‐wide specialized EI service to adult‐onset psychosis patients, to promote public awareness on early psychosis, and to research on the optimal intervention model and duration for early psychosis in a 4‐year randomized controlled trial (RCT). Participants were randomly assigned to receive either 4 years of EI service, 2 years of EI service, or 4 years of standard care. Their symptoms, neurocognitive functions, psychosocial well‐being and health economics were regularly assessed.
Results
To date, 360 patients were recruited into the RCT, and 740 patients were recruited in a 2‐year naturalistic study. Prospective, longitudinal follow‐up assessments of these patients are still underway.
Conclusions
JCEP is the first EI project to provide adult early psychosis service in Chinese population. Future data would help to address the optimal duration of EI and its cost‐effectiveness. This would also assist regional and international mental health development.
Microtubules are a proven target for anticancer drug development because they are critical for mitotic spindle formation and the separation of chromosomes at mitosis. ...2-(Naphthalene-1-yl)-6-pyrrolidinyl-4-quinazolinone (HL66) induced cell death with the large cells and multiple micronuclei in M21 skin cancer cells. We demonstrated that HL66-induced cell death is caspase-independent and accompanied by the failure of cell cycle progression. Therefore, HL66-induced cell death may be a mitotic catastrophe. HL66 inhibits the dephosphorylation on Thr14 or Tyr15 of cyclin-dependent kinase (Cdk) 1 and the formation of Cdk1/cyclin B1 complex, which might be associated with cell cycle arrest at the S and G(2)/M phases. HL66 is an antimicrotubule agent by molecular modeling on the basis of ligand binding to tubulin molecule. Furthermore, we also demonstrated that HL66, like vinblastine, is a tubulin-destabilizing agent via microtubule disruption in M21 cells. These results describe a novel pharmacological property of HL66 as a microtubule inhibitor, which may make it an attractive new agent for the treatment of skin cancer.
Ursolic acid is a triterpenoid reported to inhibit the invasion of cancer cells. In this study, there was a significant increase
in the gene expression of matrix metalloproteinase (MMP)-1, -2, -3, -9 ...and -10 in H460 cells after treatment with 10 μM ursolic
acid for 24 h. Under these experimental conditions, it was found that ursolic acid induced H460 cell apoptosis. These results
indicated that matrix metalloproteinase family members are involved not only in invasion, but also in apoptosis of cancer
cells. It has been suggested that ursolic acid acts via a glucocorticoid receptor in the regulation of MMP. Our study also
demonstrated that the localization of glucocorticoid receptor in the cytosol might be an important factor of MMP up-regulation
during ursolic acid-induced H460 cell apoptosis. Ursolic acid induced a typical apoptosis on H460 cells, which was characterized
by the activation of caspase-3, nuclear morphological changes and DNA fragmentation.
Aim
No oral niche can be considered to be segregated from the subjacent milieu because of the complex community behavior and nature of the oral biofilms. The aim of this study was to address the ...paucity of information on how these species are clonally related to the subjacent gingival crevice bacteria.
Methods
We utilized a metagenomic approach of amplifying 16S rDNA from genomic DNA, cloning, sequencing and analysis using LIBSHUFF software to assess the genetic homogeneity of the bacterial species from two infected root canals and subjacent gingival crevices.
Results
The four niches studied yielded 186 clones representing 54 phylotypes. Clone library comparisons using LIBSHUFF software indicated that each niche was inhabited by a unique flora. Further, 42% of the clones were of hitherto unknown phylotypes indicating the extent of bacterial diversity, especially in infected root canals and subjacent gingival crevices.
Conclusions
We believe data generated through this novel analytical tool shed new light on understanding oral microbial ecosystems.
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