Displaying publications 21 - 40 of 1141 in total

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  1. Yong SP, Kamaralzaman S, Budin SB
    MyJurnal
    This study aimed to identify the foot sensory status of Malay women with type 2 diabetes mellitus and to determine its relation with: demographic factors, glycated haemoglobin level in plasma, and body mass index. A cross-sectional study was conducted on 71 Malay women with type 2 diabetes mellitus who attend three health clinics in Hulu Langat District, Selangor. Foot sensation was assessed using the Semmes-Weinstein Monofilament 5.07 in nine locations on the plantar and dorsal of the feet. Loss of protective sensation was defined as inability to sense the monofilament in one or more sites of either foot. This study found that 56.3% of women had loss of protective sensation, with common sites being the heel, fifth metatarsal head, lateral mid-foot and little toe. Duration of diabetes mellitus were significantly related to foot sensation. The age, HbA1C level and body mass index did not show any significant correlation. Loss of protective sensation may lead to serious foot complication and therefore early screening involving multidisciplinary team is essential for prevention.


    Matched MeSH terms: Malaysia/ethnology
  2. Yong RY, Gan LS, Coble MD, Yap EP
    Leg Med (Tokyo), 2007 Sep;9(5):278-81.
    PMID: 17467323
    MiniSTR loci has demonstrated to be an effective approach to recover genetic information from degraded sample, due to the improved PCR efficiency of their reduced PCR amplicon sizes. This study constructed a partial miniSGM panel and investigated the performance of four miniSTR loci, D2S1338, D16S539, D18S51 and FGA, in three ethnic populations residing in Singapore. The suitability of the miniSTR primers for Singapore populations was assessed for loci D16S539, D18S51 and FGA.
    Matched MeSH terms: Malaysia/ethnology
  3. Yong EL, Ganesan G, Kramer MS, Logan S, Lau TC, Cauley JA, et al.
    Osteoporos Int, 2019 Apr;30(4):879-886.
    PMID: 30671610 DOI: 10.1007/s00198-019-04839-5
    Despite an increase in absolute numbers, the age-standardized incidence of hip fractures in Singapore declined in the period 2000 to 2017. Among the three major ethnic groups, Chinese women had the highest fracture rates but were the only group to show a temporal decline.

    INTRODUCTION: A study published in 2001 predicted a 30-50% increase in Singapore hip fracture incidence rates over the ensuing 30 years. To test that prediction, we examined the incidence of hip fracture in Singapore from 2000 to 2017.

    METHODS: We carried out a population-based study of hip fractures among Singapore residents aged ≥ 50 years. National medical insurance claims data were used to identify admissions with a primary discharge diagnosis of hip fracture. Age-adjusted rates, based on the age distribution of the Singapore population of 2000, were analyzed separately by sex and ethnicity (Chinese, Malay, or Indian).

    RESULTS: Over the 18-year study period, 36,082 first hip fractures were recorded. Total hip fracture admissions increased from 1487 to 2729 fractures/year in the years 2000 to 2017. Despite this absolute increase, age-adjusted fracture rates declined, with an average annual change of - 4.3 (95% CI - 5.0, - 3.5) and - 1.1 (95% CI - 1.7, - 0.5) fractures/100,000/year for women and men respectively. Chinese women had 1.4- and 1.9-fold higher age-adjusted rates than Malay and Indian women: 264 (95% CI 260, 267) versus 185 (95% CI 176, 193) and 141 (95% CI 132, 150) fractures/100,000/year, respectively. Despite their higher fracture rates, Chinese women were the only ethnic group exhibiting a decline, most evident in those ≥ 85 years, in age-adjusted fracture rate of - 5.3 (95% CI - 6.0, - 4.5) fractures/100,000/year.

    CONCLUSION: Although the absolute number of fractures increased, steep drops in elderly Chinese women drove a reduction in overall age-adjusted hip fracture rates. Increases in the older population will lead to a rise in total number of hip fractures, requiring budgetary planning and new preventive strategies.

    Matched MeSH terms: Malaysia/ethnology
  4. Yeo L, Fan SH, Say YH
    Malays J Med Sci, 2012 Jan;19(1):43-51.
    PMID: 22977374 MyJurnal
    BACKGROUND: Cocaine- and amphetamine-regulated transcript (CART) is a hypothalamic anorectic neuropeptide that controls feeding behaviour and body weight. The study objective was to investigate the association of the CART prepropeptide gene (CARTPT) rs2239670 variant with obesity and its related anthropometric indicators among patients of a Malaysian health clinic in Kampar, Perak, Malaysia.
    METHODS: A total of 300 Malay/Peninsular Bumiputera, Chinese, and Indian subjects (115 males, 185 females; 163 non-obese, 137 obese) were recruited by convenience sampling, and anthropometric measurements, blood pressures, and pulse rate were taken. Genotyping was performed using AvaII polymerase chain reaction-restriction fragment length polymorphism.
    RESULTS: Genotyping revealed 203 (67.7%), 90 (30.0%), and 7 (2.3%) subjects with the GG, GA, and AA genotypes, respectively, with a minor allele (A) frequency of 0.17. No significant difference in the CARTPT rs2239670 genotype and allele distribution was found between obese and non-obese subjects, and logistic regression showed no association between the mutated genotypes (GA, AA) and allele (A) with obesity, even after adjusting for age, gender, and ethnicity. Furthermore, the measurements did not differ significantly between the genotypes and alleles. No significant difference in the genotype and allele distribution was found among genders, but they were significantly different among ethnicities (P = 0.030 and P = 0.019, respectively).
    CONCLUSION: CARTPT rs2239670 is not a predictor for obesity among the Malaysian subjects in this study.
    KEYWORDS: Malaysia; anthropometry; cocaine- and amphetamine-regulated transcript protein; genetic association study; obesity; single nucleotide polymorphism
    Matched MeSH terms: Malaysia/ethnology
  5. Yeo KK, Tai BC, Heng D, Lee JM, Ma S, Hughes K, et al.
    Diabetologia, 2006 Dec;49(12):2866-73.
    PMID: 17021918 DOI: 10.1007/s00125-006-0469-z
    AIMS/HYPOTHESIS: The aim of the study was to determine whether the risk of ischaemic heart disease (IHD) associated with diabetes mellitus differs between ethnic groups.

    METHODS: Registry linkage was used to identify IHD events in 5707 Chinese, Malay and Asian Indian participants from three cross-sectional studies conducted in Singapore between the years 1984 and 1995. The study provided a median of 10.2 years of follow-up with 240 IHD events experienced. We assessed the interaction between diabetes mellitus and ethnicity in relation to the risk of IHD events using Cox proportional hazards regression.

    RESULTS: Diabetes mellitus was more common in Asian Indians. Furthermore, diabetes mellitus was associated with a greater risk of IHD in Asian Indians. The hazard ratio when comparing diabetes mellitus with non-diabetes mellitus was 6.41 (95% CI 5.77-7.12) in Asian Indians and 3.07 (95% CI 1.86-5.06) in Chinese (p = 0.009 for interaction). Differences in the levels of established IHD risk factors among diabetics from the three ethnic groups did not appear to explain the differences in IHD risk.

    CONCLUSIONS/INTERPRETATION: Asian Indians are more susceptible to the development of diabetes mellitus than Chinese and Malays. When Asian Indians do develop diabetes mellitus, the risk of IHD is higher than for Chinese and Malays. Consequently, the prevention of diabetes mellitus amongst this ethnic group is particularly important for the prevention of IHD in Asia, especially given the size of the population at risk. Elucidation of the reasons for these ethnic differences may help us understand the pathogenesis of IHD in those with diabetes mellitus.
    Matched MeSH terms: Malaysia/ethnology
  6. Yeo GS, Chan WB, Lun KC, Lai FM
    Ann Acad Med Singap, 1994 May;23(3):371-6.
    PMID: 7944253
    A systematic collection of fetal morphometric measurements was started seven years ago in 1987 with the prospective entry of data into personal computer-based stations in the Department of Obstetrics and Gynaecology, Singapore General Hospital. A cross-sectional study was done, comparing 2392 Chinese fetuses with 2117 Malay fetuses and 459 Indian fetuses from 18 to 40 weeks. The mean values of the head circumference (HC), abdominal circumference (AC) and femur length (FL) of the 3 ethnic groups were analysed. There were no statistical significant differences in the head circumference and abdominal circumference of Chinese, Malay and Indian fetuses in Singapore. The Chinese and Malay fetal femur length appeared similar but were apparently shorter than the Indian femur length. Nomograms of head circumference, abdominal circumference and femur length were constructed for application to fetuses of all 3 ethnic groups.
    Matched MeSH terms: Malaysia/ethnology
  7. Yee, Xing You, Suzana Shahar, Hasnah Haron, Hanis Mastura Yahya, Normah Che Din
    Jurnal Sains Kesihatan Malaysia, 2019;17(3):139-148.
    MyJurnal DOI: 10.17576/JSKM-2019-16
    Ulam is fresh traditional Malaysian vegetables which normally consumed in raw form or after a short blanching process.It contains high antioxidants and polyphenols. However, there is limited study about the relationship between ulam consumption and cognitive status. Thus, a cross sectional study was conducted to determine the relation with cognitive function among 132 middle-aged Malays adults (45-59 years old), ecruited by convenient sampling from low income residences in Klang Valley. Respondents were interviewed to obtain data on sociodemography, dietary intake and total ulam intake and also measured for anthropometric parameters at respective community centres. Cognitive status was measured using Digit Span (attention and working memory), Rey auditory verbal learning test (RAVLT) (verbal memory) and comprehensive trail making test (CTMT) (cognitive flexibility). The average ulam intake by the respondents was 15.1 ± 8.2g/day and the top five highest consumed ulam were petai (68.1%), pucuk paku (62.9%), ulam raja (56.8%), pegaga (54.6%) and kesum (44.7%).There was a significant correlation between ulam intake with Digit Span (r = 0.265, p = 0.006), total immediate recall of RAVLT (r = 0.427, p < 0.001) and CTMT (r = 0.257, p = 0.007). Analysis of multiple regression indicated that total ulam intake was a significant predictor for Digit Span (R2 = 0.152, p < 0.05), RAVLT (R2 = 0.335, p = 0.001) and CTMT (R2 = 0.310, p < 0.001). In conclusion, this study showed that ulam has the potential to protect against cognitive decline, however, randomized control trials should be conducted to determine the efficacy of the ulam as neuroprotective agent.
    Matched MeSH terms: Malaysia/ethnology
  8. Yeap SS
    Int J Rheum Dis, 2009 Jul;12(2):177-8; author reply 179.
    PMID: 20374340 DOI: 10.1111/j.1756-185X.2009.01403.x
    Comment on: Shahrir M, Shahdan M, Shahid M, Sulaiman W, Mokhtar AM, Othman M, et al. Multicentre survey of rheumatoid arthritis patients from ministry of health rheumatology centers in malaysia. Int J Rheum Dis. 2008;11(3):287-92. doi:10.1111/j.1756-185X.2008.00379.x;
    Matched MeSH terms: Malaysia/ethnology
  9. Yeap SS, Mohd A, Kumar G, Kong KF, Chow SK, Goh EM, et al.
    Autoimmunity, 2007 May;40(3):187-90.
    PMID: 17453717 DOI: 10.1080/08916930701233755
    OBJECTIVE:
    To assess the relationship between the HLA-DRB1 genes with disease severity as assessed by radiological erosions in Malaysian patients with rheumatoid arthritis (RA).

    METHODS:
    In this cross-sectional study, we studied 61 RA patients who fulfilled the ACR criteria for the diagnosis of RA. HLA-DRB1 genotyping was performed by sequence specific primer (SSP) - PCR. Radiological grading and erosive score of the hands and wrists was calculated according to the Larsen-Dale method. Demographic data and treatment given to the patients were obtained from their case records.

    RESULTS:
    Fifty-six females and five males were studied from three ethnic groups. In 57 patients with erosions, rheumatoid factor was detected in 80%, HLA-DR4 in 40%, HLA-DRB1*0405 in 24% and shared epitope (SE) in 31%. The median delay in starting DMARDs was 24 months. The presence of rheumatoid factor, HLA-DR4 and HLA-DRB1*0405 were not significantly associated with a worse erosive score. Patients who possessed the SE had a higher erosive scores, compared to those who did not (p = 0.05). Concurrently, a delay in starting DMARD was associated with a high erosive score (p = 0.023, r = 0.348). However, after adjustment for the delay in starting DMARD, SE was no longer significantly associated with the erosive score.

    CONCLUSIONS:
    In these patients, the delay in starting DMARDs had a greater influence on the erosive score than SE alone. Whilst we cannot discount the contribution of the SE presence, we would advocate early usage of DMARDs in every RA patient to reduce joint erosions and future disability.
    Matched MeSH terms: Malaysia/ethnology
  10. Yeap SS, Nur Fazirah MFR, Nur Aisyah C, Zahari Sham SY, Samsudin IN, C Thambiah S, et al.
    Osteoporos Sarcopenia, 2017 Jun;3(2):112-116.
    PMID: 30775514 DOI: 10.1016/j.afos.2017.05.001
    Objective: Following an osteoporotic fracture, pharmacological treatment is recommended to increase bone mineral density and prevent future fractures. However, the rate of starting treatment after an osteoporotic hip fracture remains low. The objective of this study was to survey the treatment rate following a low-trauma hip fracture at a tertiary private hospital in Malaysia over a period of 5 years.

    Methods: The computerised hospital discharge records were searched using the terms "hip," "femur," "femoral," "trochanteric," "fracture," or "total hip replacement" for all patients over the age of 50, admitted between 2010 and 2014. The medical charts were obtained and manually searched for demographic data and treatment information. Hip operations done for non-low-trauma-related fracture and arthritis were excluded.

    Results: Three hundred seventy patients over the age of 50 years were admitted with a hip fracture, of which 258 (69.7%) were low trauma, presumed osteoporotic, hip fractures. The median age was 79.0 years (interquartile range [IQR], 12.0). Following a hip fracture, 36.8% (95 of 258) of the patients received treatment, but out of these, 24.2% (23 of 95) were on calcium/vitamin D only. The median duration of treatment was 1 month (IQR, 2.5). In 2010, 56.7% of the patients received treatment, significantly more than subsequent years 2011-2014, where approximately only 30% received treatment.

    Conclusions: Following a low-trauma hip fracture, approximately 72% of patients were not started on active antiosteoporosis therapy. Of those who were, the median duration of treatment was 1 month. This represents a missed opportunity for the prevention of future fractures.
    Matched MeSH terms: Malaysia/ethnology
  11. Yap WS, Chan CC, Chan SP, Wang YT
    Respir Med, 2001 Apr;95(4):297-304.
    PMID: 11316113
    When standing height (StndHt) cannot be assessed, arm span (AS) or sitting height (SitHt) has been used as surrogate variables for prediction of StndHt in adult caucasians and blacks. We examined (1) the relationship between StndHt, AS and SitHt among adult Chinese, Malays and Indians; and (2) whether anthropometry could explain the ethnic differences in lung volumes (as StndHt-adjusted lung volumes are known to differ significantly: Chinese > Malays > Indians). We recruited 1250 consecutive outpatients aged 20-90 years. Prediction equations of StndHt (with AS, SitHt, weight, age as predictors) for each subgroup of race and sex were formulated with multiple linear regressions. Equations with both AS and SitHt as predictors had the best goodness of fit (SEE = 2.37-2.85 cm, adjusted R2 = 0.67-0.87), as compared to equations with either AS (SEE = 3.00-3.91 cm, adjusted R2 = 0.58-0.80) or SitHt alone (SEE = 3.48-4.00 cm, adjusted R2 = 0.45-0.76). GLM general factorial analyses found that age- and weight-adjusted SitHt-to-StndHt ratios differed significantly among Chinese (0.539), Malays (0.529) and Indians (0.518). This paralleled the ethnic differences in lung volumes. The equations with both AS and SitHt as predictors provide the most accurate estimate of StndHt. Ethnic differences in upper body segment length may explain in part the lung volume differences.
    Study site: Respiratory clinic, Tan Tock Seng Hospital, Singapore
    Matched MeSH terms: Malaysia/ethnology
  12. Yap TW, Chan WK, Leow AH, Azmi AN, Loke MF, Vadivelu J, et al.
    PLoS One, 2015;10(3):e0121908.
    PMID: 25799401 DOI: 10.1371/journal.pone.0121908
    BACKGROUND: Celiac disease (CD) is an immune-mediated disorder induced by the ingestion of gluten in genetically susceptible persons. The prevalence of CD in Malaysia is unknown. We aim to determine the seroprevalence of CD antibodies and also investigate the correlation between H. pylori infection and CD in the young and healthy multiracial Malaysian population.

    METHODS: Healthy young adult volunteers between the ages of 18-30 years were consecutively recruited from June 2012 to May 2014 at the University of Malaya Medical Centre (UMMC), Kuala Lumpur. Serum samples from all the participants were tested for anti-gliadin antibody immunoglobulin A/immunoglobulin G (IgA/IgG) and anti-tissue transglutaminase antibody (tTG) IgA/IgG. Samples positive for both anti-gliadin and anti-tTG were further validated for anti-human endomysial IgA antibodies (EmA). Serological diagnosis of CD was made when anti-gliadin, anti-tTG and anti-EmA were positive.

    RESULTS: 562 qualified participants with mean age 24 ± 2.4 years old were recruited into our study. CD was found in 7 participants where most of them were asymptomatic and unaware of their CD status. The median of anti-gliadin and anti-tTG IgA/IgG value was 38.2 U/ml (interquartile range, 28.3-60.4 U/ml) and 49.2 U/ml (interquartile range, 41.1-65.9 U/ml), respectively. Seroprevalence of CD antibodies was 1.9% (6 out of 324) in female while only 0.4% (1 out of 238) in male. Seroprevalence among Malay was 0.8% (2 of 236), Chinese was 1.7% (3 of 177) and Indian was 1.3% (2 of 149). Overall, seroprevalence of CD antibodies in healthy asymptomatic adults in the Malaysian population was 1.25% (95% CI, 0.78%-1.72%). No significant relationship was discovered between CD and H. pylori infection.

    CONCLUSIONS: The seroprevalence of CD antibodies in healthy young adults in the Malaysian population was 1.25% (1 in 100). CD is underdiagnosed and it could be a much greater problem in Malaysia than previously thought.

    Matched MeSH terms: Malaysia/ethnology
  13. Yap SN, Phipps ME, Manivasagar M, Bosco JJ
    Immunol Lett, 1999 Jun 01;68(2-3):295-300.
    PMID: 10424435
    The neutrophil antigen (NA)1 and 2 is coded by two recognized allelic forms of Fc gamma receptor IIIB (FcgammaRIIIB). FcgammaRIIIb is a low affinity receptor and preferentially removes immune complexes from the circulation. Systemic lupus erythematosus (SLE) is an autoimmune and polygenic disorder characterized by accumulation of autoimmune complexes. The majority of SLE patients in our medical center are of Chinese ethnicity, followed by Malay and Indian. Recently, studies have focussed on the Fc receptors in different ethnic groups and their relation to SLE. We chose to study the gene distribution of this receptor in the Chinese and Malays population in Malaysia. We designed a polymerase chain reaction allele specific primers (PCR-ASP) method to distinguish the two allelic forms. Genomic DNA was isolated from the peripheral blood of 183 Chinese and 55 Malays SLE patients as well as 100 Chinese and 50 Malays healthy controls. Genotyping of Chinese SLE patients revealed that the gene frequencies for FcgammaRIIIB-NA1 and FcgammaRIIIB-NA2 were 0.648 and 0.347, while in the ethnically matched healthy controls they were 0.68 and 0.32, respectively. One out of the 183 Chinese SLE patients was identified as a NA-null due to the absence of PCR product for both alleles. The FcgammaRIIIB-NA1 and FcgammaRIIIB-NA2 allele frequencies for both the Malays SLE and healthy controls were 0.62 and 0.38.
    Matched MeSH terms: Malaysia/ethnology
  14. Yap SB, Teoh ST
    Asia Pac J Public Health, 1989;3(4):297-300.
    PMID: 2517875
    An anthropometric assessment was conducted on a sample of 309 children, aged twelve years and below, from an urban squatter community in Kuala Lumpur, Malaysia. The community consists mainly of Malays and Indians and is fairly established with a mean length of residence of about fifteen years. There was not much difference between the two ethnic groups with regard to educational status or income. Most of the residents were unskilled or semiskilled workers employed in factories and government agencies. About 40 percent of the infants and toddlers were found to be wasted, while about one-third of the older children were stunted. There appears to be some association between income per capita and nutritional status.
    Matched MeSH terms: Malaysia/ethnology
  15. Yap FBB, Kiung ST
    South. Med. J., 2009 Jun;102(6):653-5.
    PMID: 19434036 DOI: 10.1097/SMJ.0b013e3181a49a71
    A 43-year-old lady with type 2 diabetes mellitus and bronchial asthma presented with varicella zoster infection, dyspnea, and neck fullness. An urgent computed tomography scan revealed a mediastinal abscess with superior vena cava thrombus. Blood, mediastinal pus, and swab from a vesiculopustule on the neck cultured group A beta hemolytic Streptococcus. She recovered with a combination of broad spectrum antimicrobials, antivirals, and surgical drainage. This case illustrates the rare occurrence of mediastinal abscess and acute superior vena cava obstruction caused by group A beta hemolytic Streptococcus complicating adult varicella zoster.
    Matched MeSH terms: Malaysia/ethnology
  16. Yap FB
    Trans R Soc Trop Med Hyg, 2011 Jul;105(7):405-8.
    PMID: 21600621 DOI: 10.1016/j.trstmh.2011.04.002
    A retrospective study was undertaken to determine the clinical features of cutaneous larva migrans (CLM) seen in the Department of Dermatology, Hospital Kuala Lumpur (Kuala Lumpur, Malaysia) and to assess the rate of correct diagnosis made by the referring primary care doctors. Clinical records of all 31 patients with CLM seen between January 2006 and June 2010 were retrieved. The majority of patients were male. The mean age was 32.2 years. Pruritus was reported in 83.9% of cases and serpiginous tracts in 100%. The mean lesion count was 4.4 and the mean duration of disease before presentation was 3.1 weeks. The majority of skin lesions were on the buttock and lower extremities. Only 45.2% of patients had the correct diagnosis made by the referring primary care doctors. Older age of patients and lower number of lesions were associated with a higher rate of correct diagnosis. The low rate of correct diagnosis made by the referring primary care doctors to the dermatologists in this study warrants the need for education of not only primary care doctors but also future primary care providers, consisting of medical students, house officers and junior medical officers.

    Study site: Department of Dermatology, Hospital Kuala Lumpur
    Matched MeSH terms: Malaysia/ethnology
  17. Yang Y, Østbye T, Tan SB, Abdul Salam ZH, Ong BC, Yang KS
    J Diabetes Complications, 2011 Nov-Dec;25(6):382-6.
    PMID: 21983153 DOI: 10.1016/j.jdiacomp.2011.08.002
    BACKGROUND:
    Among other risk factors, renal disease and ethnicity have been associated with diabetic lower extremity amputation (LEA) in Western populations. However, little is known about risk factors for LEA among Asian patients.

    OBJECTIVE:
    The objective was to assess the proportion of hospitalized patients with diabetes who have a LEA among all hospital patients with diabetes mellitus (DM) and to investigate risk factors for diabetic LEA (especially renal disease and ethnicity) using hospital discharge database.

    METHOD:
    A retrospective study of hospital discharge database (2004-2009) was performed to identify patients with DM, LEA and renal disease using the International Statistical Classification of Diseases and Related Health Problems, Ninth Revision, Australian Modification codes.

    RESULTS:
    Of 44 917 hospitalized patients with DM during the 6 years, 7312 (16.3%) patients had renal disease, and 1457 (3.2%) patients had LEA. DM patients with renal disease had significant higher rates of LEA (7.1%) compared to DM patients without renal disease (2.5%, P < .001). The differences were present for foot (2.7% vs. 1.2%), ankle or leg (2.8% vs. 0.9%), and knee or above amputation (1.6% vs. 0.4%, all P
    Matched MeSH terms: Malaysia/ethnology
  18. Yahya P, Sulong S, Harun A, Wangkumhang P, Wilantho A, Ngamphiw C, et al.
    Int J Legal Med, 2020 Jan;134(1):123-134.
    PMID: 31760471 DOI: 10.1007/s00414-019-02184-0
    Ancestry-informative markers (AIMs) can be used to infer the ancestry of an individual to minimize the inaccuracy of self-reported ethnicity in biomedical research. In this study, we describe three methods for selecting AIM SNPs for the Malay population (Malay AIM panel) using different approaches based on pairwise FST, informativeness for assignment (In), and PCA-correlated SNPs (PCAIMs). These Malay AIM panels were extracted from genotype data stored in SNP arrays hosted by the Malaysian node of the Human Variome Project (MyHVP) and the Singapore Genome Variation Project (SGVP). In particular, genotype data from a total of 165 Malay individuals were analyzed, comprising data on 117 individual genotypes from the Affymetrix SNP-6 SNP array platform and data on 48 individual genotypes from the OMNI 2.5 Illumina SNP array platform. The HapMap phase 3 database (1397 individuals from 11 populations) was used as a reference for comparison with the Malay genotype data. The accuracy of each resulting Malay AIM panel was evaluated using a machine learning "ancestry-predictive model" constructed by using WEKA, a comprehensive machine learning platform written in Java. A total of 1250 SNPs were finally selected, which successfully identified Malay individuals from other world populations with an accuracy of 90%, but the accuracy decreased to 80% using 157 SNPs according to the pairwise FST method, while a panel of 200 SNPs selected using In and PCAIMs could be used to identify Malay individuals with an accuracy of approximately 80%.
    Matched MeSH terms: Malaysia/ethnology
  19. Yahya NK, Afzal N, Daud KM
    Objectives: To evaluate the frequency of HLA Class II antigens in Malays with SLE in order to determine their role in disease susceptibility and association with clinical manifestations.
    Design: Cross-sectional study
    Methods: Fifty-four SLE patients from Malay ethnic attending Physician Clinic at Hospital Universiti Sains Malaysia were enrolled into the study. Demographic and clinical findings were obtained from medical records. HLA typing of class II antigens were carried out using MicroSSP Class II generic (DRB/ DQB) from One Lambda Inc. Controls were from ethnically matched healthy individuals.
    Results: A univariate analysis confirmed the association between HLA-DR15 with SLE compared to healthy control group; and was maintained using multiple logistic regression model (P corr = 0.002, adjusted OR = 5.513). There was a weak decrease of HLA-DR4 which was not significant after corrections for multiple comparisons made. DR7 was found to be significantly increased in patients with malar rash. There was positive association of DR15 with arthritis in patients compare to those without.
    Conclusion: Our data support the role of HLA Class II genes in conferring SLE susceptibility.
    Study site: Physician Clinic, Hospital Universiti Sains Malaysia (HUSM), Kelantan, Malaysia
    Matched MeSH terms: Malaysia/ethnology
  20. Yahya A, Bengtsson C, Larsson P, Too CL, Mustafa AN, Abdullah NA, et al.
    Mod Rheumatol, 2014 Mar;24(2):271-4.
    PMID: 24593203 DOI: 10.3109/14397595.2013.854076
    OBJECTIVES: Silica exposure has been associated with an increased risk of developing rheumatoid arthritis (RA), especially among smokers. In this study, we aimed at examining the association between silica exposure (and its interaction with smoking) and the risk of RA in the Malaysian population.
    METHODS: In total, 149 cases and 213 matched controls, all men, were included between August 2005 and December 2009. A case was defined as a person with early diagnosed RA using the 1987 American College of Rheumatology criteria for RA. Controls were randomly selected matched on sex, age and residential area. Silica exposure was defined as exposure to stone dust, rock drilling or stone crushing, and smoking status was categorized as ever/never cigarette smoking.
    RESULTS: An increased risk of anti-citrullinated protein antibody (ACPA)-positive RA (OR = 2.4, 95 % CI 1.0-5.6) was observed among those exposed to silica. Ever-smokers exposed to silica had a particularly high risk of developing ACPA-positive RA (OR = 7.5, 95 % CI 2.3-24.2), compared with never-smokers not exposed to silica. No association was found regarding ACPA-negative RA.
    CONCLUSION: Our data demonstrate that exposure to both silica and cigarette smoke comprise risks for developing RA in the Malaysian genetic context. The findings expand a link between environmental lung exposures and ACPA-positive RA to Asian populations.
    Matched MeSH terms: Malaysia/ethnology
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