BioChain Beijing Science and Technology Inc.

Beijing, China

BioChain Beijing Science and Technology Inc.

Beijing, China
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PubMed | Chinese Academy of Sciences, Beijing Military General Hospital, Peking Union Medical College, Electronic Technology Inc. and 2 more.
Type: Journal Article | Journal: The Journal of molecular diagnostics : JMD | Year: 2016

SEPT9 gene methylation was validated as a biomarker for colorectal cancer (CRC) for >10 years and available as the Epi proColon test as an aid in CRC detection for >6 years. It was proven to be an accurate, reliable, fast, and convenient molecular test. In this opportunistic screening study, we validated a further simplified SEPT9 gene methylation assay in 1031 subjects in Chinese hospitals. The sensitivity for CRC detection was 76.6% at a specificity of 95.9%, and the results showed a satisfactory detection rate for each CRC stage, including early stages. The new SEPT9 assay, with enhanced technical simplicity, convenience, and lower cost, did not differ in performance compared with Epi proColon 2.0, the commercialized SEPT9 assay. The CRC detection sensitivity was further enhanced when the assay was combined with carcinoembryonic antigen (sensitivity, 86.4%) or fecal immunochemical test (sensitivity, 94.4%), suggesting that the combined tests may be an effective option for future opportunistic screening. In brief, our study has validated a new SEPT9 assay andcombined testing as an aid in cancer detection, providing a new approach for opportunistic CRC screening.

Song Y.,Peking Union Medical College | Liu J.,Peking Union Medical College | Huang S.,Peking Union Medical College | Zhang L.,BioChain Beijing Science and Technology Inc.
Placenta | Year: 2013

Preeclampsia (PE), which affects 2-7% of human pregnancies, causes significant maternal and neonatal morbidity and mortality. To better understand the pathophysiology of PE, the gene expression profiles of placental tissue from 5 controls and 5 PE patients were assessed using microarray. A total of 224 transcripts were significantly differentially expressed (>2-fold change and q value < 0.05, SAM software). Gene Ontology (GO) enrichment analysis indicated that genes involved in hypoxia and oxidative and reductive processes were significantly changed. Three differentially expressed genes (DEGs) involved in these biological processes were further verified by quantitative real-time PCR. Finally, the potential therapeutic agents for PE were explored via the Connectivity Map database. In conclusion, the data obtained in this study might provide clues to better understand the pathophysiology of PE and to identify potential therapeutic agents for PE patients. © 2013 Elsevier Ltd. All rights reserved.

Gao J.,Peking Union Medical College | Liu C.,Peking Union Medical College | Yao F.,Peking Union Medical College | Hao N.,Peking Union Medical College | And 6 more authors.
Molecular Cytogenetics | Year: 2012

Background: Array-based comparative genomic hybridization (aCGH) is a new technique for detecting submicroscopic deletions and duplications, and can overcome many of the limitations associated with classic cytogenetic analysis. However, its clinical use in spontaneous abortion needs comprehensive evaluation. We used aCGH to investigate chromosomal imbalances in 100 spontaneous abortions and compared the results with G-banding karyotyping and fluorescence in situ hybridization (FISH). Inconsistent results were verified by quantitative fluorescence PCR. Results: Abnormalities were detected in 61 cases. aCGH achieved the highest detection rate (93.4%, 57/61) compared with traditional karyotyping (77%, 47/61) and FISH analysis (68.9%, 42/61). aCGH identified all chromosome abnormalities reported by traditional karyotyping and interphase FISH analysis, with the exception of four triploids. It also detected three additional aneuploidy cases in 37 specimens with normal karyotypes, one mosaicism and 10 abnormalities in 14 specimens that failed to grow in vitro. Conclusions: aCGH analysis circumvents many limitations in traditional karyotyping or FISH. The accuracy and efficiency of aCGH in spontaneous abortions highlights its clinical usefulness for the future. As aborted tissues have the potential to be contaminated with maternal cells, the threshold value of detection in aCGH should be lowered to avoid false negatives. © 2012 Gao et al.; licensee BioMed Central Ltd.

Luo Q.,Central China Normal University | Shang J.,Central China Normal University | Feng X.,Central China Normal University | Guo X.,Central China Normal University | And 2 more authors.
Current Microbiology | Year: 2013

The foodborne pathogen Listeria monocytogenes has the ability to develop biofilm in the food-processing environment, which becomes a major concern for food safety. PrfA, a key transcriptional activator that regulates most of the known listerial virulence gene expression, has been shown to promote L. monocytogenes biofilm formation. In this study, the whole-genome microarray was used to identify differentially expressed genes associated with the putative interaction between biofilm formation and PrfA in L. monocytogenes. Comparative transcriptome analyses indicated that over 21.9 % of the L. monocytogenes EGDe genes (627 out of 2,857 predicted) were altered in their expression of biofilm compared to the planktonic phase. These genes were classified into different functional categories which cover most of the biochemical functions encountered in bacterial cells, indicating that L. monocytogenes biofilm formation is probably controlled by a complex regulation network involved in variable genes required for the different biological pathways. Further comparison of gene expression profiles of biofilms between L. monocytogenes EGDe and its PrfA deletion mutant revealed 185 genes associated with PrfA and biofilm formation. Except for 10 genes, transcription levels of 175 genes were completely opposite between ΔprfA and wild-type during the biofilm formation, i.e., up-regulated genes in ΔprfA were down-regulated in the wild-type strain, and vice versa, indicating that loss of PrfA dramatically altered gene expression patterns in L. monocytogenes biofilm and resulted in reduced ability of the biofilm formation. © 2013 Springer Science+Business Media New York.

Yan Y.,Capital Medical University | Wu Q.,Capital Medical University | Zhang L.,BioChain Beijing Science and Technology Inc. | Wang X.,Capital Medical University | And 6 more authors.
Ultrasound in Obstetrics and Gynecology | Year: 2014

Objectives To evaluate the usefulness of array-based comparative genomic hybridization (aCGH) for prenatal genetic diagnosis of congenital heart disease (CHD), with and without associated anomalies, and to explore the relationship between submicroscopic chromosomal aberrations and CHD. Methods In this prospective study we investigated 76 consecutive singleton fetuses with abnormal cardiac ultrasound findings, normal karyotype and negative or no fluorescence in-situ hybridization results for 22q11.2 deletion syndrome. All pregnancies underwent aCGH in a comprehensive search for chromosomal aberrations. The relationship between copy number variations (CNVs) and CHD was determined by comparing clinical findings to chromosomal databases. Results CNVs that were benign or had no clinical significance were detected in 18/76 (23.7%) cases. CNVs of unknown clinical significance (i.e. VOUS) were detected in 4/76 (5.3%) cases. Pathogenic CNVs were detected in 5/76 (6.6%) cases. Fetuses with CHD and additional structural abnormalities demonstrated no difference in number of pathogenic CNVs when compared with fetuses with isolated CHD (7.4% (n = 2/27) vs 6.1% (n = 3/49), P > 0.05). Conclusion In this study cohort, aCGH analysis significantly improved the detection of submicroscopic chromosomal aberrations in pregnancies with CHD, as compared with conventional cytogenetics. Our results suggest that aCGH can provide additional genetic information in fetuses with abnormal heart findings. Copyright © 2013 ISUOG. Published by John Wiley & Sons Ltd. Linked Comment: Ultrasound Obstet Gynecol 2014; 43: 363-363 Copyright © 2013 ISUOG. Published by John Wiley & Sons Ltd.

Li Y.,Chinese PLA General Hospital | Song L.,Chinese PLA General Hospital | Song L.,BioChain Beijing Science and Technology Inc. | Gong Y.,Chinese PLA General Hospital | He B.,Chinese PLA General Hospital
Biomarkers in Medicine | Year: 2014

Colorectal cancer has become the third most common cancer in the world. Early diagnosis and treatment can significantly reduce colorectal cancer mortality. The current routinely used fecal-based screening methods do not provide satisfactory sensitivity. Although colonoscopy provides macroscopic diagnosis, the compliance is low due to its inconvenience and complications. Hence, the development of new screening methods is needed urgently. Peripheral blood SEPT9 gene methylation assay has become a potential option with promising future for early detection and screening of colorectal cancer. It is shown to be convenient, reliable with good compliance by several clinical trials. This article will review the theoretical foundation and development of the assay, focusing on its clinical trials, comparing it with other screening methods and discussing its future applications. © 2014 Future Medicine Ltd.

PubMed | Fudan University, The Chinese PLA 309th hospital, The Army General Hospital and BioChain Beijing Science and Technology Inc
Type: Journal Article | Journal: PloS one | Year: 2016

Epigenetic markers based on differential methylation of DNA sequences are used in cancer screening and diagnostics. Detection of abnormal methylation at specific loci by real-time quantitative polymerase chain reaction (RT-qPCR) has been developed to enable high-throughput cancer screening. For tests that combine the results of multiple PCR replicates into a single reportable result, both individual PCR cutoff and weighting of the individual PCR result are essential to test outcome. In this opportunistic screening study, we tested samples from 1133 patients using the triplicate Epi proColon assay with various algorithms and compared it with the newly developed single replicate SensiColon assay that measures methylation status of the same SEPT9 gene sequence. The Epi proColon test approved by the US FDA (1/3 algorithm) showed the highest sensitivity (82.4%) at a lower specificity (82.0%) compared with the Epi proColon 2.0 CE version with 2/3 algorithm (75.1% sensitivity, 97.1% specificity) or 1/1 algorithm (71.3% sensitivity, 92.7% specificity). No significant difference in performance was found between the Epi proColon 2.0 CE and the SensiColon assays. The choice of algorithm must depend on specific test usage, including screening and early detection. These considerations allow one to choose the optimal algorithm to maximize the test performance. We hope this study can help to optimize the methylation detection in cancer screening and early detection.

Song L.,BioChain Beijing Science and Technology Inc. | Li Y.,The Chinese PLA 309 Hospital
Advances in Clinical Chemistry | Year: 2015

SEPT9 gene methylation has been implicated as a biomarker for colorectal cancer (CRC) for more than 10. years and has been used clinically for more than 6. years. Studies have proven it to be an accurate, reliable, fast, and convenient method for CRC. In this chapter, we will first provide the background on the role of septin9 protein and the theoretical basis of the SEPT9 gene methylation assay. We will then focus on the performance of SEPT9 gene methylation assay for CRC early detection and screening by analyzing the data obtained in clinical trials and comparing its performance with other methods or markers. Finally, we will discuss the future applications of the assay in monitoring cancer recurrence, evaluating surgery, chemotherapy, and predicting long-term survival. We hope this chapter can provide a full overview of the theoretical basis, development, validation, and clinical applications of the SEPT9 assay for both basic science researchers and clinical practitioners. © 2015 Elsevier Inc.

Song L.,The Chinese PLA 309 Hospital | Song L.,BioChain Beijing Science and Technology Inc | Yu H.,The Chinese PLA 309 Hospital | Li Y.,The Chinese PLA 309 Hospital
Molecular Diagnosis and Therapy | Year: 2015

Lung cancer is the most prevalent cancer in the world. Few effective and cheap methods are available so far for early detection and screening of lung cancer. Although histological and cytological examinations are gold standards in lung cancer diagnosis, patients are always at late stages when diagnosis is confirmed. Therefore, new diagnostic methods are needed urgently to increase the early diagnostic rate, enhance the confirmed diagnostic rate, and reduce mortality. The SHOX2 gene methylation assay has become a promising option for the above purposes. It has been shown to enhance the confirmed diagnostic rate of lung cancer in several clinical trials when combined with histological or cytological assays, and has the potential to become an early diagnostic tool. This article reviews the outcome of clinical trials using the SHOX2 gene methylation assay alone or in combination with other examinations, and suggests its future applications and research directions. © 2015, Springer International Publishing Switzerland.

Song L.,The Chinese PLA 309th Hospital | Song L.,BioChain Beijing Science and Technology Inc | Li Y.,The Chinese PLA 309th Hospital
Stem Cell Reviews and Reports | Year: 2016

Stems cells of the colon crypt are the origin of colon mature cells. Colorectal cancer cells are also suggested to originate from crypt stem cells undergoing a series of epigenetic and genetic alterations. Aberrant methylation plays important roles in early carcinogenesis and lead to altered gene expression and regulation, resulting in accumulation of damages to cell function and ultimately, malignant transformation. Aberrances in hypermethylation and hypomethylation act in different mechanism through the regulation of various genes during CSC carcinogenesis, and both of them play crucial roles in stem cell differentiation towards cancer cells. A large majority of epigenetic and genetic abnormalities that work coordinately in colorectal carcinogenesis are related to cell growth and division, indicating that the intrinsic abnormalities of CRC lie in dysregulation of basic cellular processes. Detection of abnormal methylation can be used in cancer screening and early detection, while reversal of aberrant methylation using drugs may have potential in cancer therapy. This review will provide an overview on the roles of aberrant methylation and a summary of genes that are affected during CRC carcinogenesis. © 2016 Springer Science+Business Media New York

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