Displaying publications 1 - 20 of 26 in total

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  1. Lee WS, Ong SY, Foo HW, Wong SY, Kong CX, Seah RB, et al.
    World J Gastroenterol, 2017 Nov 21;23(43):7776-7784.
    PMID: 29209118 DOI: 10.3748/wjg.v23.i43.7776
    AIM: To examine the medical status of children with biliary atresia (BA) surviving with native livers.

    METHODS: In this cross-sectional review, data collected included complications of chronic liver disease (CLD) (cholangitis in the preceding 12 mo, portal hypertension, variceal bleeding, fractures, hepatopulmonary syndrome, portopulmonary hypertension) and laboratory indices (white cell and platelet counts, total bilirubin, albumin, international normalized ratio, alanine aminotransferase, aspartate aminotransferase, γ-glutamyl transpeptidase). Ideal medical outcome was defined as absence of clinical evidence of CLD or abnormal laboratory indices.

    RESULTS: Fifty-two children [females = 32, 62%; median age 7.4 years, n = 35 (67%) older than 5 years] with BA (median age at surgery 60 d, range of 30 to 148 d) survived with native liver. Common complications of CLD noted were portal hypertension (40%, n = 21; 2 younger than 5 years), cholangitis (36%) and bleeding varices (25%, n = 13; 1 younger than 5 years). Fifteen (29%) had no clinical complications of CLD and three (6%) had normal laboratory indices. Ideal medical outcome was only seen in 1 patient (2%).

    CONCLUSION: Clinical or laboratory evidence of CLD are present in 98% of children with BA living with native livers after hepatoportoenterostomy. Portal hypertension and variceal bleeding may be seen in children younger than 5 years of age, underscoring the importance of medical surveillance for complications of BA starting at a young age.

  2. Lee WS, Tee CW, Koay ZL, Wong TS, Zahraq F, Foo HW, et al.
    World J Gastroenterol, 2018 Mar 07;24(9):1013-1021.
    PMID: 29531465 DOI: 10.3748/wjg.v24.i9.1013
    AIM: To study implications of measuring quality indicators on training and trainees' performance in pediatric colonoscopy in a low-volume training center.

    METHODS: We reviewed retrospectively the performance of pediatric colonoscopies in a training center in Malaysia over 5 years (January 2010-December 2015), benchmarked against five quality indicators: appropriateness of indications, bowel preparations, cecum and ileal examination rates, and complications. The European Society of Gastrointestinal Endoscopy guideline for pediatric endoscopy and North American Society for Pediatric Gastroenterology, Hepatology and Nutrition training guidelines were used as benchmarks.

    RESULTS: Median (± SD) age of 121 children [males = 74 (61.2%)] who had 177 colonoscopies was 7.0 (± 4.6) years. On average, 30 colonoscopies were performed each year (range: 19-58). Except for investigations of abdominal pain (21/177, 17%), indications for colonoscopies were appropriate in the remaining 83%. Bowel preparation was good in 87%. One patient (0.6%) with severe Crohn's disease had bowel perforation. Cecum examination and ileal intubation rate was 95% and 68.1%. Ileal intubation rate was significantly higher in diagnosing or assessing inflammatory bowel disease (IBD) than non-IBD (72.9% vs 50.0% P = 0.016). Performance of four trainees was consistent throughout the study period. Average cecum and ileal examination rate among trainees were 97% and 77%.

    CONCLUSION: Benchmarking against established guidelines helps units with a low-volume of colonoscopies to identify area for further improvement.

  3. Ong SY, Tang MM, Dalawi I, Tan WC, Yeoh CA, Kho WM, et al.
    Med J Malaysia, 2020 07;75(4):349-355.
    PMID: 32723993
    OBJECTIVES: High rates of syphilis have been reported worldwide among men who have sex with men (MSM). This study aims to describe the clinical pattern and treatment response of syphilis among human immunodeficiency virus (HIV)-infected MSM in Malaysia.

    METHODS: This is a retrospective study on all HIV-infected MSM with syphilis between 2011 and 2015. Data was collected from case notes in five centres namely Hospital Kuala Lumpur, Hospital Sultanah Bahiyah, Hospital Umum Sarawak, University of Malaya Medical Centre and Hospital Sungai Buloh.

    RESULTS: A total of 294 HIV seropositive MSM with the median age of 29 years (range 16-66) were confirmed to have syphilis. Nearly half (47.6%) were in the age group of 20-29 years. About a quarter (24.1%) was previously infected with syphilis. Eighty-three patients (28.2%) had other concomitant sexually transmitted infection with genital warts being the most frequently reported (17%). The number of patients with early and late syphilis in our cohort were almost equal. The median pre-treatment non-treponemal antibody titre (VDRL or RPR) for early syphilis (1:64) was significantly higher than for late syphilis (1:8) (p<0.0001). The median CD4 count and the number of patients with CD4 <200/μl in early syphilis were comparable to late syphilis. Nearly four-fifth (78.9%) received benzathine-penicillin only, 5.8% doxycycline, 1.4% Cpenicillin, 1% procaine penicillin, and 12.4% a combination of the above medications. About 44% received treatment and were lost to follow-up. Among those who completed 1 -year follow-up after treatment, 72.3% responded to treatment (serological non-reactive - 18.2%, four-fold drop in titre - 10.9%; serofast - 43.6%), 8.5% failed treatment and 17% had re-infection. Excluding those who were re-infected, lost to follow-up and died, the rates of treatment failure were 12.1% and 8.8% for early and late syphilis respectively (p=0.582).

    CONCLUSION: The most common stage of syphilis among MSM with HIV was latent syphilis. Overall, about 8.5% failed treatment at 1-year follow-up.

  4. Chew LS, Lim XJ, Chang CT, Kamaludin RS, Leow HL, Ong SY, et al.
    Med J Malaysia, 2023 Sep;78(5):602-608.
    PMID: 37775486
    INTRODUCTION: Previous trials and real-world studies have shown that nirmatrelvir/ritonavir (Paxlovid®) reduces hospitalisation and deaths in symptomatic, high-risk, nonsevere COVID-19 patients. However, there was a scarcity of data on its effectiveness in the local setting. This study aimed to determine the effectiveness of Paxlovid® in reducing hospitalisation and mortality among COVID-19 patients and to identify the types of adverse events that occur after taking Paxlovid®.

    MATERIALS AND METHODS: A two-arm prospective cohort study was conducted among adult patients with COVID-19 categories 2 and 3 treated with Paxlovid® and a matched control group. A standard risk-stratified scoring system was used to establish Paxlovid® eligibility. All patients who were prescribed Paxlovid® and took at least one dose of Paxlovid® were included in the study. The control patients were selected from a centralised COVID-19 patient registry and matched based on age, gender and COVID-19 stage severity.

    RESULTS: A total of 552 subjects were included in the study and evenly allocated to the treatment and control groups. There was no statistically significant difference in 28-day hospitalisation after diagnosis [Paxlovid®: 26 (9.4%), Control: 34 (12.3%), OR: 0.74; 95%CI, 0.43-1.27; p=0.274] or all-cause death [Paxlovid®: 2 (0.7%), Control: 3 (1.1%), OR 1.51; 95%CI, 0.25-9.09; p=0.999]. There was no significant reduction in hospitalisation duration, intensive care unit admission events or supplementary oxygen requirement in the treatment arm. Ethnicity, COVID-19 severity at diagnosis, comorbidities and vaccination status were predictors of hospitalisation events.

    CONCLUSION: In this two-arm study, Paxlovid® did not significantly lower the incidence of hospitalisation, all-cause death and the need for supplemental oxygen. Adverse effects were frequent but not severe. Paxlovid® efficacy varied across settings and populations, warranting further real-world investigations.

  5. Ong SY, Pratap CB, Wan X, Hou S, Rahman AY, Saito JA, et al.
    Stand Genomic Sci, 2013;7(3):483-96.
    PMID: 24019994 DOI: 10.4056/sigs.3286690
    Salmonella enterica subspecies enterica serovar Typhi is a rod-shaped, Gram-negative, facultatively anaerobic bacterium. It belongs to the family Enterobacteriaceae in the class Gammaproteobacteria, and has the capability of residing in the human gallbladder by forming a biofilm and hence causing the person to become a typhoid carrier. Here we present the complete genome of Salmonella enterica subspecies enterica serotype Typhi strain P-stx-12, which was isolated from a chronic carrier in Varanasi, India. The complete genome comprises a 4,768,352 bp chromosome with a total of 98 RNA genes, 4,691 protein-coding genes and a 181,431 bp plasmid. Genome analysis revealed that the organism is closely related to Salmonella enterica serovar Typhi strain Ty2 and Salmonella enterica serovar Typhi strain CT18, although their genome structure is slightly different.
  6. Wong EW, Yusof MY, Mansor MB, Anbazhagan D, Ong SY, Sekaran SD
    Singapore Med J, 2009 Aug;50(8):822-6.
    PMID: 19710984
    The AdeABC pump of Acinetobacter spp. confers resistance to various antibiotic classes. This pump is composed of the AdeA, AdeB, and AdeC proteins where AdeB is a member of the resistance-nodulation-division efflux pump superfamily. The adeA, adeB, and adeC genes are contiguous and adjacent to adeS and adeR, which are transcribed in the opposite direction and which specify proteins homologous to sensors and regulators of two-component systems, respectively. In this study, an attempt is made to elucidate the role of the AdeABC efflux pump in carbapenem resistance in Acinetobacter spp.
  7. Yam MF, Por LY, Peh KK, Ahmad M, Asmawi MZ, Ang LF, et al.
    Sensors (Basel), 2011;11(5):5058-70.
    PMID: 22163890 DOI: 10.3390/s110505058
    Behavioural assessment of experimental pain is an essential method for analysing and measuring pain levels. Rodent models, which are widely used in behavioural tests, are often subject to external forces and stressful manipulations that cause variability of the parameters measured during the experiment. Therefore, these parameters may be inappropriate as indicators of pain. In this article, a stepping-force analgesimeter was designed to investigate the variations in the stepping force of rats in response to pain induction. The proposed apparatus incorporates new features, namely an infrared charge-coupled device (CCD) camera and a data acquisition system. The camera was able to capture the locomotion of the rats and synchronise the stepping force concurrently so that each step could be identified. Inter-day and intra-day precision and accuracy of each channel (there were a total of eight channels in the analgesimeter and each channel was connected to one load cell and one amplifier) were studied using different standard load weights. The validation studies for each channel also showed convincing results whereby intra-day and inter-day precision were less than 1% and accuracy was 99.36-100.36%. Consequently, an in vivo test was carried out using 16 rats (eight females and eight males). The rats were allowed to randomly walk across the sensor tunnel (the area that contained eight channels) and the stepping force and locomotion were recorded. A non-expert, but from a related research domain, was asked to differentiate the peaks of the front and hind paw, respectively. The results showed that of the total movement generated by the rats, 50.27 ± 3.90% in the case of the male rats and 62.20 ± 6.12% in that of the female rats had more than two peaks, a finding which does not substantiate the assumptions made in previous studies. This study also showed that there was a need to use the video display frame to distinguish between the front and hind paws in the case of 48.80 ± 4.01% of the male rats and 66.76 ± 5.35% of the female rats. Evidently the assumption held by current researchers regarding stepping force measurement is not realistic in terms of application, and as this study has shown, the use of a video display frame is essential for the identification of the front and hind paws through the peak signals.
  8. Lee WS, Karthik SV, Ng RT, Ong SY, Ong C, Chiou FK, et al.
    Pediatr Neonatol, 2019 08;60(4):396-404.
    PMID: 31409456 DOI: 10.1016/j.pedneo.2018.09.007
    BACKGROUND: Current knowledge on the clinical features and natural history of childhood primary sclerosing cholangitis - inflammatory bowel disease in Asia is limited. We described the presenting features and natural history of primary sclerosing cholangitis-inflammatory bowel disease seen in a cohort of Southeast Asian children.

    METHODS: We conducted a retrospective review of childhood primary sclerosing cholangitis-inflammatory bowel disease from three tertiary centers in Singapore and Malaysia.

    RESULTS: Of 24 patients (boys, 58%; median age at diagnosis: 6.3 years) with primary sclerosing cholangitis-inflammatory bowel disease (ulcerative colitis, n = 21; Crohn's disease, n = 1; undifferentiated, n = 2), 63% (n = 15) were diagnosed during follow-up for colitis, and 21% (n = 5) presented with acute or chronic hepatitis, 17% (n = 4) presented simultaneously. Disease phenotype of liver involvement showed 79% had sclerosing cholangitis-autoimmune hepatitis overlap, 54% large duct disease, and 46% small duct disease. All patients received immunosuppression therapy. At final review after a median [±S.D.] duration follow-up of 4.7 [±3.8] years, 12.5% patients had normal liver enzymes, 75% persistent disease, and 12.5% liver failure. The proportion of patients with liver cirrhosis increased from 13% at diagnosis to 29%; 21% had portal hypertension, and 17% had liver dysfunction. One patient required liver transplant. Transplant-free survival was 95%. For colitis, 95% had pancolitis, 27% rectal sparing, and 11% backwash ileitis at initial presentation. At final review, 67% patients had quiescent bowel disease with immunosuppression. One patient who had UC with pancolitis which was diagnosed at 3 years old developed colorectal cancer at 22 years of age. All patients survived.

    CONCLUSIONS: Liver disease in primary sclerosing cholangitis-inflammatory bowel disease in Asian children has variable severity. With immunosuppression, two-thirds of patients have quiescent bowel disease but the majority have persistent cholangitis and progressive liver disease.

  9. Lee WS, Jalaludin MY, Wong SY, Ong SY, Foo HW, Ng RT
    Pediatr Neonatol, 2019 02;60(1):12-18.
    PMID: 29680189 DOI: 10.1016/j.pedneo.2018.03.011
    BACKGROUND: To determine vitamin D status in children with chronic liver disease (CLD) in a tropical country.

    METHODS: Cross-sectional study in Malaysian children with CLD. Factors affecting serum vitamin D level (definition: deficient 

  10. Ng CB, Tan YL, Kamaludin RS, Chang CT, Chew CC, Foong WK, et al.
    J Pharm Policy Pract, 2023 Jul 10;16(1):85.
    PMID: 37430298 DOI: 10.1186/s40545-023-00579-4
    BACKGROUND: COVID-19 pandemic has created challenges to the ward pharmacy practice. Challenges arose due to new norms in the ward pharmacy practice. Adaptive measures to overcome these challenges were important to sustain the quality of pharmaceutical care. This study aimed to identify the perceived challenges and attitudes towards adaptive measures in the ward pharmacy practice during the COVID-19 pandemic and determined their association with pharmacists' characteristics.

    METHOD: This cross-sectional study was conducted in 14 Perak state hospitals and 12 primary health clinics through an online survey. All ward pharmacists and trainee pharmacists with at least 1 month of ward pharmacy experience and working in government-funded health facilities were included. The validated survey tool consisted of demographic characteristics, pharmacists' experience towards challenges (22 items), and their attitude towards adaptive measures (9 items). Each item was measured based on a 5-point Likert scale. One-way ANOVA and logistic regression were employed to determine the association of pharmacists' characteristics against their experience and attitude.

    RESULTS: Out of 175 respondents, 144 (81.8%) were female, and 84 (47.7%) were Chinese. Most pharmacists served in the medical ward (124, 70.5%). Commonly reported perceived challenges were difficulties in counselling medication devices (3.63 ± 1.06), difficulties in clerking medication history from family members (3.63 ± 0.99), contacting family members (3.46 ± 0.90), patient's digital illiteracy in virtual counselling (3.43 ± 1.11) and completeness of the electronic records (3.36 ± 0.99). For attitude towards adaptive measures, improving internet connection (4.62 ± 0.58), ensuring availability of multilingual counselling videos (4.45 ± 0.64), and provision of internet-enabled mobile devices (4.39 ± 0.76) were the most agreeable by the pharmacists. Male (AOR: 2.63, CI 1.12-6.16, p = 0.026) and master's degree holders (AOR: 2.79, CI 0.95-8.25, p = 0.063) had greater odds of high perceived challenging experience scores. Master's degree holders (AOR: 8.56, CI 1.741-42.069, p = 0.008) were also more likely to have a positive attitude score towards adaptive measures.

    CONCLUSION: Pharmacists faced multiple challenges in the ward pharmacy practice during the COVID-19 pandemic, especially in medication history assessment and patient counselling. Pharmacists, especially those with higher levels of education and longer tenure, exhibited a higher level of agreement towards the adaptive measures. The positive attitudes of pharmacists towards various adaptive measures, such as improvement of internet infrastructure and digital health literacy among patients and family members, warrant immediate action plans from health authorities.

  11. Lee GW, Chew KS, Wong SY, Chong SY, Ong SY, Lee WS
    J Paediatr Child Health, 2022 Nov;58(11):1972-1979.
    PMID: 35880617 DOI: 10.1111/jpc.16130
    AIM: Quality of life (QoL) in children with inflammatory bowel disease (IBD) is often impaired by underlying disease. We evaluated factors affecting health-related QoL (HRQoL) in Malaysian children with IBD.

    METHODS: A cross-sectional study using IMPACT-III questionnaires evaluating HRQoL in children aged 8-17 years with duration of IBD of ≥6 months was conducted. IMPACT-III, a validated instrument designed to measure HRQoL in children with IBD, was used. Higher IMPACT-III (maximum = 100) score indicates better HRQoL. Impact of socio-demographic and clinical factors of IBD on the HRQoL was evaluated. Paediatric Crohn's disease (CD) and ulcerative colitis (UC) activity indices were used to classify disease severity.

    RESULTS: A total of 75 children (UC = 44, CD = 41; mean (SD) age at diagnosis 8.2 (3.5) years) were interviewed at mean age of 12.8 (2.7) years. Mean IMPACT-III score was significantly lower in children with more severe disease (mild: 71.8 (13.6) vs. moderate: 65.5 (10.9) vs. severe: 46.3 (14.5); P 

  12. Ong SY, Ng FL, Badai SS, Yuryev A, Alam M
    J Integr Bioinform, 2010;7(1).
    PMID: 20861532 DOI: 10.2390/biecoll-jib-2010-145
    Signal transduction through protein-protein interactions and protein modifications are the main mechanisms controlling many biological processes. Here we described the implementation of MedScan information extraction technology and Pathway Studio software (Ariadne Genomics Inc.) to create a Salmonella specific molecular interaction database. Using the database, we have constructed several signal transduction pathways in Salmonella enterica serovar Typhi which causes Typhoid Fever, a major health threat especially in developing countries. S. Typhi has several pathogenicity islands that control rapid switching between different phenotypes including adhesion and colonization, invasion, intracellular survival, proliferation, and biofilm formation in response to environmental changes. Understanding of the detailed mechanism for S. Typhi survival in host cells is necessary for development of efficient detection and treatment of this pathogen. The constructed pathways were validated using publically available gene expression microarray data for Salmonella.
  13. Ong SY, Kho HP, Riedel SL, Kim SW, Gan CY, Taylor TD, et al.
    J Biotechnol, 2018 Jan 10;265:31-39.
    PMID: 29101024 DOI: 10.1016/j.jbiotec.2017.10.017
    Polyhydroxyalkanoates (PHAs) are produced in microbes as a source of carbon and energy storage. They are biodegradable and have properties similar to synthetic plastics, which make them an interesting alternative to petroleum-based plastics. In this study, a refined method of recovering PHA from Cupriavidus necator biomass was proposed by incorporating the use of the yellow mealworm (the larval phase of the mealworm beetle, Tenebrio molitor) as partial purification machinery, followed by washing of the fecal pellets with distilled water and sodium hydroxide. The PHA contents of the cells used in this study were 55wt% (produced from palm olein) and 60 wt% (produced from waste animal fats). The treatment of distilled water and NaOH further increased the purity of PHA to 94%. In parallel, analysis of the 16S rRNA metagenomic sequencing of the mealworm gut microbiome has revealed remarkable changes in the bacterial diversity, especially between the mealworms fed with cells produced from palm olein and waste animal fats. This biological recovery of PHA from cells is an attempt to move towards a green and sustainable process with the aim of reducing the use of harmful solvents and strong chemicals during polymer purification. The results obtained show that - purities of >90%, without a reduction in the molecular weight, can be obtained through this integrative biological recovery approach. In addition, this study has successfully shown that the cells, regardless of their origins, were readily consumed by the mealworms, and there is a correlation between the feed type and the mealworm gut microbiome.
  14. Ong SY, Pratap CB, Wan X, Hou S, Abdul Rahman AY, Saito JA, et al.
    J Bacteriol, 2012 Apr;194(8):2115-6.
    PMID: 22461552 DOI: 10.1128/JB.00121-12
    We report here the complete genome sequence of Salmonella enterica subsp. enterica serovar Typhi P-stx-12, a clinical isolate obtained from a typhoid carrier in India.
  15. Lee WS, Azmi N, Ng RT, Ong SY, Ponnampalavanar SS, Mahadeva S, et al.
    Intest Res, 2017 Oct;15(4):524-528.
    PMID: 29142521 DOI: 10.5217/ir.2017.15.4.524
    Anti-tumor necrosis factor (anti-TNF) is highly effective in inflammatory bowel disease (IBD); however, it is associated with an increased risk of infections, particularly in older adults. We reviewed 349 patients with IBD, who were observed over a 12-month period, 74 of whom had received anti-TNF therapy (71 patients were aged <60 years and 3 were aged ≥60 years). All the 3 older patients developed serious infectious complications after receiving anti-TNFs, although all of them were also on concomitant immunosuppressive therapy. One patient developed disseminated tuberculosis, another patient developed cholera diarrhea followed by nosocomial pneumonia, while the third patient developed multiple opportunistic infections (Pneumocystis pneumonia, cryptococcal septicemia and meningitis, Klebsiella septicemia). All 3 patients died within 1 year from the onset of the infection(s). We recommend that anti-TNF, especially when combined with other immunosuppressive therapy, should be used with extreme caution in older adult patients with IBD.
  16. Ong SY, Roslan S, Ahmad NA, Ayub AFM, Ping CL, Zaremohzzabieh Z, et al.
    PMID: 33806563 DOI: 10.3390/ijerph18052566
    Background: This study evaluates the effectiveness of parent-assisted children's friendship training intervention for enhancing friendship quality and social skills among children with autism spectrum disorders (ASD). We conducted a quasi-experimental study to investigate the effective outcomes of social skills and friendship quality in the pre-and post-parent-assisted CFT intervention phases; Methods: to conduct a 12-week field session, 30 children with their parents were selected. The Social Skills Improvement System Rating Scales and the Quality of Play Questionnaire-Parent were used to assess the effectiveness of the parent-assisted children's friendship training during pre-and post-intervention. A semi-structured interview with parents was conducted at the end of the session; Results: findings revealed that intervention improved the social skills of these children. Additionally, the friendship quality of children with ASD improved before and after the intervention, however, engagement remained unchanged. Parents also showed some sort of improvement after the session as they reported a heightened sense of fear and resistance, awareness, learning and adjustment, change is not easy, and identifying support; Conclusions: there was clear evidence that children with ASD benefitted from parent-assisted CFTs in terms of social skills and friendship quality. However, larger and controlled studies are required to draw firm conclusions about this kind of intervention.
  17. Lee PY, Cheong AT, Ghazali SS, Rashid AA, Ong SC, Ong SY, et al.
    Health Expect, 2022 Dec;25(6):2837-2850.
    PMID: 36098241 DOI: 10.1111/hex.13590
    BACKGROUND: Shared decision-making has been shown to improve the quality of life in metastatic breast cancer patients in high-literacy and high-resource settings. However, limited studies have examined the cultural preferences of metastatic breast cancer patients with shared decision-making implementation and the barriers encountered in an Asian setting where societal norms predominate and physician decision-making is at the forefront. This paper aims to identify (1) barriers to practising shared decision-making faced by healthcare professionals and patients and (2) strategies for implementing shared decision-making in the context of metastatic breast cancer management in Malaysia.

    METHODS: We conducted a qualitative study involving 12 patients diagnosed with metastatic breast cancer, 16 healthcare professionals and 5 policymakers from surgical and oncology departments at public healthcare centres in Malaysia. Semi-structured in-depth interviews and focus group discussions were conducted. The interviews were recorded, transcribed verbatim and analysed using the thematic approach. Nvivo software was used to manage and analyse the data.

    RESULTS: Five main themes emerged from the study: healthcare provider-patient communication, workforce availability, cultural and belief systems, goals of care and paternalism versus autonomy. Other strategies proposed to overcome barriers to implementing shared decision-making were training of healthcare professionals and empowering nurses to manage patients' psychosocial issues.

    CONCLUSION: This study found that practising shared decision-making in the public health sector remains challenging when managing patients with metastatic breast cancer. The utilization of decision-making tools, patient empowerment and healthcare provider training may help address the system and healthcare provider-patient barriers identified in this study.

    PATIENT OR PUBLIC CONTRIBUTION: Patients were involved in the study design, recruitment and analysis.

  18. Nanthini J, Ong SY, Sudesh K
    Gene, 2017 Sep 10;628:146-155.
    PMID: 28711667 DOI: 10.1016/j.gene.2017.07.039
    Rubber materials have greatly contributed to human civilization. However, being a polymeric material does not decompose easily, it has caused huge environmental problems. On the other hand, only few bacteria are known to degrade rubber, with studies pertaining them being intensively focusing on the mechanism involved in microbial rubber degradation. The Streptomyces sp. strain CFMR 7, which was previously confirmed to possess rubber-degrading ability, was subjected to whole genome sequencing using the single molecule sequencing technology of the PacBio® RS II system. The genome was further analyzed and compared with previously reported rubber-degrading bacteria in order to identify the potential genes involved in rubber degradation. This led to the interesting discovery of three homologues of latex-clearing protein (Lcp) on the chromosome of this strain, which are probably responsible for rubber degrading activities. Genes encoding oxidoreductase α-subunit (oxiA) and oxidoreductase β-subunit (oxiB) were also found downstream of two lcp genes which are located adjacent to each other. In silico analysis reveals genes that have been identified to be involved in the microbial degradation of rubber in the Streptomyces sp. strain CFMR 7. This is the first whole genome sequence of a clear-zone-forming natural rubber- degrading Streptomyces sp., which harbours three Lcp homologous genes with the presence of oxiA and oxiB genes compared to the previously reported Gordonia polyisoprenivorans strain VH2 (with two Lcp homologous genes) and Nocardia nova SH22a (with only one Lcp gene).
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