ORCID Profile
0000-0001-9763-1762
Current Organisation
AMILI PTE LTD
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Publisher: Springer Science and Business Media LLC
Date: 23-02-2016
DOI: 10.1038/SREP21661
Abstract: Cell surface antigens are important targets for monoclonal antibodies, but they are often difficult to work with due to their association with the cell membrane. Phage display is a versatile technique that can be applied to generate binders against difficult targets. Here we used antibody phage display to isolate a binder for a rare and specialized cell, the human corneal endothelial cell. The human corneal endothelium is a medically important cell layer defects in this layer account for about half of all corneal transplants. Despite its importance, no specific antigens have been found to mark this cell type. By panning a phage library directly on human corneal endothelial cells, we isolated an antibody that bound to these cells and not the other types of corneal cells. Subsequently, we identified the antibody’s putative target to be CD166 by immunoprecipitation and mass spectrometry. This approach can be used to isolate antibodies against other poorly-characterized cell types, such as stem cells or cancer cells, without any prior knowledge of their discriminating markers.
Publisher: Springer Science and Business Media LLC
Date: 06-2015
DOI: 10.1038/NCOMMS8270
Abstract: IgA nephropathy (IgAN) is one of the most common primary glomerulonephritis. Previously identified genome-wide association study (GWAS) loci explain only a fraction of disease risk. To identify novel susceptibility loci in Han Chinese, we conduct a four-stage GWAS comprising 8,313 cases and 19,680 controls. Here, we show novel associations at ST6GAL1 on 3q27.3 (rs7634389, odds ratio (OR)=1.13, P =7.27 × 10 −10 ), ACCS on 11p11.2 (rs2074038, OR=1.14, P =3.93 × 10 −9 ) and ODF1-KLF10 on 8q22.3 (rs2033562, OR=1.13, P =1.41 × 10 −9 ), validate a recently reported association at ITGAX-ITGAM on 16p11.2 (rs7190997, OR=1.22, P =2.26 × 10 −19 ), and identify three independent signals within the DEFA locus (rs2738058, P =1.15 × 10 −19 rs12716641, P =9.53 × 10 −9 rs9314614, P =4.25 × 10 −9 , multivariate association). The risk variants on 3q27.3 and 11p11.2 show strong association with mRNA expression levels in blood cells while allele frequencies of the risk variants within ST6GAL1 , ACCS and DEFA correlate with geographical variation in IgAN prevalence. Our findings expand our understanding on IgAN genetic susceptibility and provide novel biological insights into molecular mechanisms underlying IgAN.
Publisher: Elsevier BV
Date: 08-2009
DOI: 10.1016/J.OPHTHA.2009.02.026
Abstract: To assess whether genetic variation in cMET is associated with refractive error or change in refractive error over time. Cohort study. Discovery set (Set 1: N = 579 children 403 cases, 176 controls). Confirmatory set (Set 2: N = 547 children 338 cases, 209 controls). Children in the discovery set were genotyped for a panel of genetic markers within cMET. Markers that were found to be significantly associated with the presence of refractive error or more rapid change in refractive error were then genotyped in the confirmatory set. Presence or absence of myopia and the rate of change in refractive error over a 3-year follow-up period. Carriage of the variant cMET +110703 A allele was found to associate with increased susceptibility to myopia. The variant was also found to associate with a faster rate of change in refractive error in both the discovery set and the confirmatory cohort regardless of the initial refractory ability (School 1 chi(2) for trend P = 0.014) (Schools 2 and 3 chi(2) for trend = 5.42, P = 0.020) (combined N = 1126, overall chi(2) for trend = 10.90, P = 9.6 x 10(-4)). Carriage of the variant allele was also found to be significantly overrepresented in children within the fastest changing quartile (Q4: mean change of -3.01 D over 3 years) compared with the slowest (Q1: mean change of -0.28 D over 3 years) (P(Set1) = 0.004, P(Set2) = 0.02, Combined N = 559, P = 3.0 x 10(-4)). Our data implicate the involvement of cMET in the pathogenesis of myopia in general, as well as more rapid progression in refractive error regardless of the initial refractory ability. These results underline the importance of eye growth genes in the development of common myopia.
Publisher: Wiley
Date: 14-02-2013
Publisher: Informa UK Limited
Date: 07-10-2022
DOI: 10.1080/03007995.2022.2129232
Abstract: Recent studies demonstrate the association of the gut microbiome in regulating interactions between the central nervous system and intestinal function. In iduals with attention-deficit hyperactivity disorder (ADHD) have been shown to have unique gut microbial signature, with depletion of beneficial commensal microbes. Fecal microbiota transplant (FMT) restores the imbalanced gut microbiome and may replete missing microbes to increase production of hormones and neurotransmitters regulating human behavior and cognition. Here, we present an interesting case of a 22-year-old woman treated with FMT primarily to treat recurrent Our case report provides preliminary evidence regarding the use of FMT in a patient with
Publisher: JMIR Publications Inc.
Date: 17-09-2020
DOI: 10.2196/15492
Abstract: Atrial fibrillation (AF) is the most common heart rhythm disorder and poses a growing disease burden worldwide because of an aging population. A multidisciplinary approach with an emphasis on patient education and self-management has been demonstrated to improve outcomes for AF through the engagement of patients in their own care. Although electronic tools (e-tools) such as apps have been proposed to provide patient education and facilitate self-management, there have been few studies to guide the development of these tools for patients with AF. This study aims to explore the perceptions of patients and health care providers (HCPs) and their attitudes toward the use of e-tools for the self-management of AF. It also seeks to elicit the factors that contribute to these attitudes. Semistructured qualitative interviews with HCPs and patients were conducted to understand the interpretations and expectations of an e-tool that would be used for the self-management of AF. Interview data were analyzed using an exploratory thematic analysis approach to uncover emergent themes and infer ideas of preferred features in a device. A modified technology acceptance model was developed as a framework to help interpret these findings. Data from the HCPs and patients were compared and contrasted. Both patients and HCPs thought that an e-tool would be useful in the self-management of AF. Although both groups favored educational content and monitoring of blood pressure, patients expressed more passivity toward self-care and an ambivalence toward the use of technology to monitor their medical condition. This appears to be related to factors such as a patient’s age, social support, and their attitudes toward technology. Instead, they favored using the app to contact their HCPs. This study provides insights into significant differences in the attitudes of patients and HCPs toward the use of e-tools for self-care against their priorities. Understanding patients’ motivations and their needs are key to ensuring higher acceptance of such tools.
Publisher: Springer Science and Business Media LLC
Date: 12-08-2023
DOI: 10.1038/S41522-023-00425-0
Abstract: The prevalence of antibiotic-resistant bacteria in Southeast Asia is a significant concern, yet there is limited research on the gut resistome and its correlation with lifestyle and environmental factors in the region. This study aimed to profile the gut resistome of 200 in iduals in Malaysia using shotgun metagenomic sequencing and investigate its association with questionnaire data comprising demographic and lifestyle variables. A total of 1038 antibiotic resistance genes from 26 classes were detected with a mean carriage rate of 1.74 ± 1.18 gene copies per cell per person. Correlation analysis identified 14 environmental factors, including hygiene habits, health parameters, and intestinal colonization, that were significantly associated with the resistome (adjusted multivariate PERMANOVA, p 0.05). Notably, in iduals with positive yeast cultures exhibited a reduced copy number of 15 antibiotic resistance genes. Network analysis highlighted Escherichia coli as a major resistome network hub, with a positive correlation to 36 antibiotic-resistance genes. Our findings suggest that E. coli may play a pivotal role in shaping the resistome dynamics in Segamat, Malaysia, and its abundance is strongly associated with the community’s health and lifestyle habits. Furthermore, the presence of yeast appears to be associated with the suppression of antibiotic-resistance genes.
Publisher: Elsevier BV
Date: 2008
DOI: 10.1016/J.CELLSIG.2007.10.003
Abstract: We report here the cloning and characterization of short and supershort mouse PDE4D isoforms. PDE4D is one of the phosphodiesterase enzyme families with multiple promoters and splice variants. PDE4 isoforms present in humans, rats and mice share considerable homology in their catalytic and regulatory domains. In this study, we have identified the novel PDE4D2 variant3 (PDE4D2v3) and PDE4D10 isoforms and the mouse orthologs of PDE4D1, PDE4D2 variant1 (PDE4D2v1), PDE4D2 variant2 (PDE4D2v2) and PDE4D6 isoforms. These isoforms have many different lengths of 5'UTR, signifying the use of different transcription start sites. Our data indicate that many novel PDE4D isoforms exist as a result of alternative mRNA splicing, each isoform having unique N-terminal regions and multiple transcription start sites. Subcellular distribution study showed that the PDE4D1 short isoforms are localized to the nucleus while the supershort isoforms (PDE4D2v1, PDE4D2v2, PDE4D2v3, PDE4D6 and PDE4D10) are restricted to the cytoplasm. Deletion study confirmed that the N-terminus of PDE4D1 is necessary for nuclear targeting. In addition, we showed that the unique N-terminus contains nuclear localization signal sequence. Identifying novel tissue-specific PDE4D isoforms with unique N-terminal regions may aid in the development of selective phosphodiesterase inhibitors.
Publisher: JMIR Publications Inc.
Date: 14-07-2019
Abstract: trial fibrillation (AF) is the most common heart rhythm disorder and poses a growing disease burden worldwide because of an aging population. A multidisciplinary approach with an emphasis on patient education and self-management has been demonstrated to improve outcomes for AF through the engagement of patients in their own care. Although electronic tools (e-tools) such as i apps /i have been proposed to provide patient education and facilitate self-management, there have been few studies to guide the development of these tools for patients with AF. his study aims to explore the perceptions of patients and health care providers (HCPs) and their attitudes toward the use of e-tools for the self-management of AF. It also seeks to elicit the factors that contribute to these attitudes. emistructured qualitative interviews with HCPs and patients were conducted to understand the interpretations and expectations of an e-tool that would be used for the self-management of AF. Interview data were analyzed using an exploratory thematic analysis approach to uncover emergent themes and infer ideas of preferred features in a device. A modified technology acceptance model was developed as a framework to help interpret these findings. Data from the HCPs and patients were compared and contrasted. oth patients and HCPs thought that an e-tool would be useful in the self-management of AF. Although both groups favored educational content and monitoring of blood pressure, patients expressed more passivity toward self-care and an ambivalence toward the use of technology to monitor their medical condition. This appears to be related to factors such as a patient’s age, social support, and their attitudes toward technology. Instead, they favored using the app to contact their HCPs. his study provides insights into significant differences in the attitudes of patients and HCPs toward the use of e-tools for self-care against their priorities. Understanding patients’ motivations and their needs are key to ensuring higher acceptance of such tools.
Publisher: Cold Spring Harbor Laboratory
Date: 15-11-2022
DOI: 10.1101/2022.11.14.516366
Abstract: Kombucha is a fermented tea traditionally known for its health-enhancing properties owing to the bioactive compounds generated by acetic acid bacteria (AAB) and lactic acid bacteria (LAB). We compared the distribution of AAB and LAB and their functional pathways across nine commercial kombucha products in Singapore using shotgun metagenomic sequencing. A high prevalence of Komagataeibacter species including Komagataeibacter saccharivorans (82.93% in B), Komagataeibacter xylinus (93.38% in D) and Komagataeibacter rhaeticus (92.20% and 30.62% in G and I) was detected in AAB-dominant kombucha. LAB-dominant kombucha was largely represented by Bacillus coagulans (~99% in E and F) and Lactobacillus nagelii (~60% in H). Despite differences in bacterial composition, both LAB-and AAB-dominant kombucha harbour pathways involved in the biosynthesis of short-chain fatty acids (SCFAs), amino and organic acids and vitamin B12. “Fatty acid and beta-oxidation II (peroxisome)” and “fatty acid and beta-oxidation I” were detected in the LAB but not the AAB-dominant kombucha.
Publisher: Massachusetts Medical Society
Date: 03-06-2010
No related grants have been discovered for Kai Yee Toh.