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Sequence polymorphism of the mitochondrial DNA hypervariable regions I and II in 205 Singapore Malays

Wong HY, Tang JS, Budowle B, Allard MW, Syn CK, Tan-Siew WF, et al.

Leg Med (Tokyo), 2007 Jan;9(1):33-7.
PMID: 17150401

Mitochondrial DNA sequences of the hypervariable regions HV1 and HV2 were analyzed in 205 unrelated ethnic Malays residing in Singapore as an initial effort to generate a database for forensic identification purposes. Sequence polymorphism was detected using PCR and direct sequencing analysis. A total of 152 haplotypes was found containing 152 polymorphisms. Out of the 152 haplotypes, 115 were observed only once and 37 types were seen in multiple individuals. The most common haplotype (16223T, 16295T, 16362C, 73G, 146C, 199C, 263G, and 315.1C) was shared by 7 (3.41%) individuals, two haplotypes were shared by 4 individuals, seven haplotypes were shared by 3 individuals, and 27 haplotypes by 2 individuals. Haplotype diversity and random match probability were estimated to be 0.9961% and 0.87%, respectively.

Matched MeSH terms: Ethnic Groups/ethnology*
Serotonin transporter gene polymorphism and its association with bipolar disorder across different ethnic groups in Malaysia

Mohamed Saini S, Nik Jaafar NR, Sidi H, Midin M, Mohd Radzi A, Abdul Rahman AH

Compr Psychiatry, 2014 Jan;55 Suppl 1:S76-81.
PMID: 23410635 DOI: 10.1016/j.comppsych.2012.12.005

The risk variants have been shown to vary substantially across populations and a genetic study in a heterogeneous population might shed a new light in the disease mechanism. This preliminary study aims to determine the frequency of the serotonin transporter gene polymorphism (5-HTTLPR) in the three main ethnic groups in Malaysia and its association with bipolar disorder.

Matched MeSH terms: Ethnic Groups/ethnology
Prevalence, racial variations, and risk factors of age-related macular degeneration in Singaporean Chinese, Indians, and Malays

Cheung CM, Li X, Cheng CY, Zheng Y, Mitchell P, Wang JJ, et al.

Ophthalmology, 2014 Aug;121(8):1598-603.
PMID: 24661862 DOI: 10.1016/j.ophtha.2014.02.004

To describe the prevalence and risk factors for age-related macular degeneration (AMD) in a multiethnic Asian cohort of Chinese, Malay, and Indian persons.

Matched MeSH terms: Ethnic Groups/ethnology*
Fulltext Ethnic differences in the association between blood pressure components and chronic kidney disease in middle aged and older Asian adults

Sabanayagam C, Teo BW, Tai ES, Jafar TH, Wong TY

BMC Nephrol, 2013;14:86.
PMID: 23590421 DOI: 10.1186/1471-2369-14-86

Chronic kidney disease (CKD) is an emerging public health problem worldwide. Previous studies have shown an association between blood pressure (BP) and CKD. However, it is not clear if there are ethnic differences in this association. We examined the association between BP and CKD in a multi-ethnic Asian population in Singapore.

Matched MeSH terms: Ethnic Groups/ethnology
Fulltext Ethnic differences in survival after breast cancer in South East Asia

Bhoo-Pathy N, Hartman M, Yip CH, Saxena N, Taib NA, Lim SE, et al.

PLoS One, 2012;7(2):e30995.
PMID: 22363531 DOI: 10.1371/journal.pone.0030995

The burden of breast cancer in Asia is escalating. We evaluated the impact of ethnicity on survival after breast cancer in the multi-ethnic region of South East Asia.

Matched MeSH terms: Ethnic Groups/ethnology*
Chronic hepatitis B infection in Malaysians

Yap SF

Malays J Pathol, 1994 Jun;16(1):3-6.
PMID: 16329567

Chronic hepatitis B virus (HBV) infection constitutes a major public health problem particularly in developing countries in East Asia, South-East Asia, the Pacific Basin and Africa. In Malaysia, a developing nation in the South East Asian region, the chronic HBV carrier rate varies between < 1% to about 10% depending on the ethnic group studied. The highest frequency is seen among the Chinese, followed by the Malays and lastly the Indians, with a male preponderance of between 2 : 1 and 3 : 1. Exposure to the virus among the adult population is estimated to be about 15%, 26% and 36% among the Indians, Malays and Chinese respectively. Serological study of adult chronic HBV carriers showed a frequency of HBe antigenemia of about 35%, with a significant decreasing trend with age. HBV DNA status generally correlated with the HBe status. An atypical profile of anti-HBe associated with serum HBV DNA is found in some carriers; in most instances, this is related to seroconversion from HBe antigenemia to anti-HBe. Chronic complications of HBV infection include the development of hepatocellular carcinoma (HCC), the occurrence of which closely parallel that of HBsAg carrier rate. In Malaysia, HCC is the third most common malignant neoplasm and among the 10 leading causes of death. About 80% of our HCC cases are HBV associated. All 3 ethnic groups are afflicted, the highest frequency being among the Chinese. Males show a disproportionate risk with an odds ratio of 3.93 (p < 0.0001).

Matched MeSH terms: Ethnic Groups/ethnology*
Sex hormones in Malay and Chinese men in Malaysia: are there age and race differences?

Chin KY, Soelaiman IN, Mohamed IN, Ahmad F, Ramli ES, Aminuddin A, et al.

Clinics (Sao Paulo), 2013;68(2):159-66.
PMID: 23525310

OBJECTIVES: Variations in the prevalence of sex-hormone-related diseases have been observed between Asian ethnic groups living in the same country; however, available data concerning their sex hormone levels are limited. The present study aimed to determine the influence of ethnicity and age on the sex hormone levels of Malay and Chinese men in Malaysia.
METHODS: A total of 547 males of Malay and Chinese ethnicity residing in the Klang Valley Malaysia underwent a detailed screening, and their blood was collected for sex hormones analyses.
RESULTS: Testosterone levels were normally distributed in the men (total, free and non-sex hormone-binding globulin (SHBG) bound fractions), and significant ethnic differences were observed (p<0.05); however, the effect size was small. In general, testosterone levels in males began to decline significantly after age 50. Significant ethnic differences in total, free and non-SHBG bound fraction estradiol levels were observed in the 20-29 and 50-59 age groups (p<0.05). The estradiol levels of Malay men decreased as they aged, but they increased for Chinese men starting at age 40.
CONCLUSIONS: Small but significant differences in testosterone levels existed between Malay and Chinese males. Significant age and race differences existed in estradiol levels. These differences might contribute to the ethnic group differences in diseases related to sex hormones, which other studies have found in Malaysia.

Matched MeSH terms: Ethnic Groups/ethnology
Distribution of PON1 polymorphisms PON1Q192R and PON1L55M among Chinese, Malay and Indian males in Singapore and possible susceptibility to organophosphate exposure

Chia SE, Mohamed Ali S, Yap PH, Gan L, Ong YB, Chia KS

Neurotoxicology, 2009 Mar;30(2):214-9.
PMID: 19135476 DOI: 10.1016/j.neuro.2008.12.004

Organophosphate (OP)-containing pesticides are widely used worldwide for domestic and industrial purposes. Studies on acute and chronic exposure to OPs have revealed numerous health effects attributed mainly to acetylcholinesterase (AChE) inhibition. The enzyme human serum paraoxonase (PON1) is involved in the detoxification of OP compounds. PON1 polymorphisms have been shown to affect susceptibility to OP exposure. We studied the effect of OP exposure on pest control workers and assessed the distribution of two common PON1 polymorphisms in our local population. The exposed group consisted of 103 workers from various pest control companies under the Singapore Pest Management Association while the 91 unexposed workers were from a lead stabilizer factory. For all workers, the mean age was 36.9 (20-70) years and the ethnic distribution was 38.1% Chinese, 44.3% Malay and 17.5% Indian. The mean+/-S.D. exposure duration among the pesticide workers was 10.4+/-8.4 years. The mean+/-S.D. RBC cholinesterase level was 18436.2+/-2078U/L and 18079.6+/-1576U/L for the exposed and unexposed groups, respectively (p=0.216). The mean+/-S.D. serum pseudocholinesterase was 11028.4+/-2867.4U/L and 9433.6+/-2022.6U/L in the exposed and unexposed groups, respectively (p<0.0001). Mean paraoxonase activity was similar among Chinese and Malays (266.5 and 266.3U/L, respectively) whereas that of the Indians was significantly lower (165.6U/L). Our study showed that cholinesterase levels among the exposed were not lower than those in the unexposed group. PON1 polymorphisms differed among ethnic groups, implying that ethnicity could be an important surrogate for identifying susceptible groups in case of OP exposure. Although OP poisoning is rare among occupationally exposed workers in Singapore, this information is useful for other developing countries that have large populations of Chinese, Malays and Indians where OP exposure could be very high especially in agricultural settings.

Matched MeSH terms: Ethnic Groups/ethnology*
Importance-performance analysis of dental satisfaction among three ethnic groups in malaysia

Dewi FD, Gundavarapu KC, Cugati N

Oral Health Prev Dent, 2013;11(2):131-9.
PMID: 23757453 DOI: 10.3290/j.ohpd.a29735

PURPOSE: To find the differences in patient satisfaction related to dental services among three ethnic groups - Chinese, Indian and Malay - at AIMST University Dental Centre and analyse them with an importance-performance grid, identifying the weak and strong points, in order to provide better service.
MATERIALS AND METHODS: This questionnaire-based study consisted of convenience samples of 174 patients of Chinese, Indian and Malay ethnicity. Importance-performance analysis for 20 attributes were compared using Likert's scale. The data obtained were statistically analysed using the Kruskal-Wallis test.
RESULTS: Chinese and Indians both emphasised low performance on the interpersonal relationship attribute in terms of the receptionist's courtesy, whereas the Malay participants were concerned with convenience attributes. All the ethnic groups favoured maintaining existing major attributes towards technical competency, interpersonal relationship and facility factors. This study demonstrated priority differences between the ethnic groups' perception of the quality of dental services, where ethnic Chinese showed the highest gap (measure of dissatisfaction) between importance and performance compared to ethnic Malays, followed by ethnic Indians.
CONCLUSION: The patients from the three major ethnic groups of Malaysia were generally well satisfied. Perhaps more priority should be placed on improving the interpersonal relationship attribute, especially with the receptionists.

Matched MeSH terms: Ethnic Groups/ethnology