MyMedR

Sexual selection on land snail shell ornamentation: a hypothesis that may explain shell diversity

Schilthuizen M

BMC Evol. Biol., 2003 Jun 05;3:13.

BACKGROUND: Many groups of land snails show great interspecific diversity in shell ornamentation, which may include spines on the shell and flanges on the aperture. Such structures have been explained as camouflage or defence, but the possibility that they might be under sexual selection has not previously been explored.

PRESENTATION OF THE HYPOTHESIS: The hypothesis that is presented consists of two parts. First, that shell ornamentation is the result of sexual selection. Second, that such sexual selection has caused the divergence in shell shape in different species.

TESTING THE HYPOTHESIS: The first part of the hypothesis may be tested by searching for sexual dimorphism in shell ornamentation in gonochoristic snails, by searching for increased variance in shell ornamentation relative to other shell traits, and by mate choice experiments using individuals with experimentally enhanced ornamentation. The second part of the hypothesis may be tested by comparing sister groups and correlating shell diversity with degree of polygamy.

IMPLICATIONS OF THE HYPOTHESIS: If the hypothesis were true, it would provide an explanation for the many cases of allopatric evolutionary radiation in snails, where shell diversity cannot be related to any niche differentiation or environmental differences.

Matched MeSH terms: Snails/genetics*

Fulltext Dermatoglyphic analysis in Malay subjects with bipolar mood disorder

Chakraborty D, Mazumdar P, Than M, Singh R

Med J Malaysia, 2001 Jun;56(2):223-6.

PMID: 11771083

Dermatoglyphic is the study of the epidermal ridges and the pattern formed by them. It may be pointed out that genetic factors have a large share in determining the variations in dermatoglyphics. It is however, suggested by evidence that bipolar mood disorder factors are determined more by genetic factors than by the environmental factors. The experiment has been undertaken to look for the effects of the bipolar mood disorder on dermatoglyphics. The dermatoglyphic characteristics of subjects with bipolar mood disorder when compared with control group revealed significant differences. The radial loop were increased in bipolar mood disorder, but there were little changes in 'atd' angles between normal and bipolar mood disorder.

Matched MeSH terms: Bipolar Disorder/genetics*

The Cry toxins and the putative hemolysins of Clostridium bifermentans ser. malaysia are not involved in mosquitocidal activity

Juárez-Pérez V, Delécluse A

J Invertebr Pathol, 2001 Jul;78(1):57-8.

PMID: 11500095

Matched MeSH terms: Bacterial Toxins/genetics

Note: characterization of Vibrio cholerae O139 Bengal isolated from water in Malaysia

Son R, Rusul G, Samuel L, Yuherman, Senthil S, Rasip A, et al.

J Appl Microbiol, 1998 Dec;85(6):1073-7.

PMID: 9871327

Four Vibrio cholerae O139 Bengal strains isolated from surface water were characterized by antibiotic resistance, plasmid profile, presence of cholera toxin gene and random amplification of polymorphic DNA (RAPD) analysis. All four strains exhibit multiple resistance towards the antibiotics tested with a multiple antibiotic resistance index of 0.5-0.66, and harboured a 2.0 MDa non-conjugative plasmid. The Vibrio cholerae O139 Bengal were positive for the cholera toxin gene. Antibiotyping and random amplification of polymorphic DNA analysis with four primers proved to be useful in discriminating the isolates. RAPD proved to be more sensitive. These results reveal that there is significant genetic diversity among the Vibrio cholerae O139 Bengal strains studied.

Matched MeSH terms: Vibrio cholerae/genetics*

Dermatoglyphics of Down's syndrome patients in Malays--a comparative study

Than M, Myat KA, Khadijah S, Jamaludin N, Isa MN

Anthropol Anz, 1998 Dec;56(4):351-65.

PMID: 10027045

There has been no recent report on the dermatoglyphics of the Malays (normal population as well as patients with Down's syndrome). A study on the frequencies of the dermal patterns (dermatoglyphics) of the digits, palms and hallucal areas was done therefore in 40 Malay patients with Down's syndrome and 200 unrelated normal controls. Only the patients with the standard 21 trisomy karyotype were included in the study. Comparison was made with the published data on studies done in various racial groups. Significant differences of the dermal patterns were found not only between the controls but also among patients of different races.

Matched MeSH terms: Down Syndrome/genetics*

Fulltext Osteogenesis Imperfecta and non-accidental injury: problems in diagnosis and management

Kasim MS, Cheah I, Sameon H

Med J Malaysia, 1995 Jun;50(2):170-5.

PMID: 7565189

It has been noted in the literature that Osteogenesis Imperfecta is frequently mistaken for non-accidental injury. This article serves to illustrate the difficulty in differentiating between the two conditions and that they can occur concomitantly in one patient.

Matched MeSH terms: Osteogenesis Imperfecta/genetics

Fulltext Future impact of molecular biology and biotechnology on bacterial and viral diseases

Pang T

Med J Malaysia, 1993 Jun;48(2):101-6.

PMID: 8350782

The advent of recombinant DNA technology has already made a significant impact on various aspects related to the basic understanding of pathogenic mechanisms in infectious diseases, as well as practical applications related to diagnostics and prevention. The present paper discusses recent technological innovations and increased analytical capabilities which promise to have an even more significant impact on the control of viral and bacterial diseases.

Matched MeSH terms: DNA, Recombinant/genetics

Fulltext Psychiatric presentation of Huntington's disease in a Malaysian family

Chin CN, S'ng KH, Philip G, Rosdinom R, Wahidah A

Med J Malaysia, 1996 Mar;51(1):153-6.

PMID: 10968000

A 32-year-old Chinese lady presented to the Psychiatric Clinic with a history of change in personality for 2 years and abnormal movements for a year. After thorough investigations and observation a diagnosis of Huntington's Disease was made. Her elder brother was traced and found to have Huntington's Disease as well. He had a long standing history of antisocial behaviour and substance abuse long before the onset of the choreiform movements. Her younger brother also has choreiform movements for the last 2 years and had recent change in personality. Their mother also had abnormal movements and was recorded to be depressed and attempted suicide. The maternal grandfather had a mental illness and was warded at a mental institution till his death in 1942. Psychiatric presentation of Huntington's Disease in this Malaysian family is prominent and preceded the characteristic movements in the present generation.

Matched MeSH terms: Huntington Disease/genetics*

Variation in the genome of rice tungro bacilliform virus: molecular characterization of six isolates

Fan Z, Dahal G, Dasgupta I, Hay J, Hull R

J Gen Virol, 1996 May;77 ( Pt 5):847-54.

PMID: 8609480

The DNA genomes of isolates of rice tungro bacilliform virus from Bangladesh, India, Indonesia, Malaysia and Thailand were cloned and compared with that of the type isolate from the Philippines. Restriction endonuclease maps revealed differences between the isolates and cross-hybridization showed that they fell into two groups, those from the Indian subcontinent and those from south-east Asian countries. The genomes of isolates from the Indian subcontinent contained a deletion of 64 bp when compared with those from south-east Asia. The implications of this variation are discussed.

Matched MeSH terms: Plant Viruses/genetics*

Pathogenesis of dengue haemorrhagic fever: towards a more balanced view

Pang T

Southeast Asian J. Trop. Med. Public Health, 1987 Sep;18(3):321-5.

PMID: 3433163

Matched MeSH terms: Dengue Virus/genetics

Glucose phosphate isomerase heterophenotypes in the human filarial parasite Brugia malayi from peninsular Malaysia

Yong HS, Mak JW

Experientia, 1984 Aug 15;40(8):833-4.

PMID: 6468590

Glucose phosphate isomerase of subperiodic Brugia malayi was studied by horizontal starch-gel electrophoresis. Two heterophenotypes, each represented by 3 bands of enzyme activity, were found among 38 parasites studied. This finding is attributed to the occurrence of 2 Gpi gene loci.

Matched MeSH terms: Glucose-6-Phosphate Isomerase/genetics*

[Descriptive epidemiology of urolithiasis]

Kodama H, Ohno Y

Hinyokika Kiyo, 1989 Jun;35(6):923-34.

PMID: 2678977

In this paper, urolithiasis is remarked from the standpoint of descriptive epidemiology, which examines the frequency distribution of a given disease in a population in terms of time, place and personal characteristics with an aim of identifying risk factors or some clues to the etiology. Some descriptive epidemiological features of urolithiasis are summarized. Prevalence rate is around 4% (4-15% in males and 4-8% in females), and incidence rate varies from area to area: 53.2 per 100,000 population in 1975 in Japan, 364 in 1976 in Malaysia, and 540 in 1979 in West Germany. Prevalence and/or incidence rates have, in general, increased in the developed countries since World War II and in the developing countries as well, where upward trends are quite analogous to the trends observed in the nineteenth century in Europe. Recurrence rate, which is much higher in males than in females, ranges from 31% to 75%, depending on the follow-up periods. In the industrialized countries, upper urinary (renal and ureteral) stones account for more than 90% of total stones, which are ordinarily calcium complexes in composition. More common in the developing countries are lower urinary (bladder and urethral) stones, frequently composed of magnesium ammonium phosphate, which indicates a close association with urinary tract infections. Variations in frequency are evident by season and by region within a country. Age and sex differentials in urinary stone formers are substantial: more common in males 30-40 years old in the industrialized countries and in children under 10 years old in the developing countries. Racial differentials are also noted; blacks appear to suffer less frequently than whites. Stone formers experience more frequent episodes of stone formation in their family members, particularly father and brothers, than non-stone formers. These findings on racial differentials and family preponderance suggest the possible relevance of genetic factors in stone formation. Stone formers are more likely to be occupationally sedentary and socially affluent. This observation and differentials by age and sex suggest the probable relevance of lifestyle and environmental factors in stone formation. Epidemiological factors incriminated for stone formation will be discussed in a separate paper.

Matched MeSH terms: Urinary Calculi/genetics

Fulltext Marfan or marfanoid: a case study

Tai YS

Med J Malaysia, 1986 Sep;41(3):233-5.

PMID: 3670140

A patient with marfanoid habitus was admitted to the General Hospital, Kuala Lumpur in October 1985 for surgical closure of an atrial septal defect. He was suspected to have Marfan Syndrome but there was no involvement of the aorta nor the eye. The clinical features were intermediate between that of the Marfan Syndrome and the Ehler's Danlos Syndrome. It is suggested that this could be a separate distinct entity within the heritable disorders of connective tissue known as the Marfanoid Hypermobility Syndrome.

Matched MeSH terms: Connective Tissue Diseases/genetics

Multiple alleles and low variability of glycerol-3-phosphate dehydrogenase in Aedes albopictus (Diptera: Culicidae) from Peninsular Malaysia

Yong HS, Yao L, Dhaliwal SS, Cheong WH, Chiang GL

Comp. Biochem. Physiol., B, 1983;75(1):43-5.

PMID: 6406135

1. A total of 8 samples from three natural populations and a laboratory strain of Aedes albopictus were analysed for glycerol-3-phosphate dehydrogenase phenotypes by means of horizontal starch-gel electrophoresis. 2. The electrophoretic phenotypes were governed by three codominant Gpd alleles. 3. There was low variability, with the heterozygosity in the variable samples ranging from 0.02 to 0.12. 4. The commonest allele in all the population samples was GpdB which encoded an electrophoretic band with intermediate mobility. 5. There was no temporal or spatial variation.

Matched MeSH terms: Glycerolphosphate Dehydrogenase/genetics*

A female Norway rat, Rattus norvegicus, with X0 sex chromosome constitution

Yong HS, Dhaliwal SS, Teh KL

Naturwissenschaften, 1989 Aug;76(8):387-8.

PMID: 2779669

Matched MeSH terms: Rats/genetics*

Fulltext Suxamethonium sensitivity -- yet another case

Sivaneswaran N, Inbasegaran K

Med J Malaysia, 1982 Dec;37(4):298-9.

PMID: 7167078

Abnormal variants of plasma cholinesterase are a rarity in this region and to date there is only one reported case of suxamethonium sensitivity in a Malaysian population. We now report a case of a Malaysian Chinese patient who received suxamethonium, developed prolonged apnoea and on investigation found to be a homozygote for the silent gene. His family was screened for abnormal variants of plasma cholinesterase. The results are discussed.

Matched MeSH terms: Drug Hypersensitivity/genetics*

Endogamy in settlement populations of Semai Senoi: potential mate pool analysis and simulation

Fix AG

Soc Biol, 1981 1 1;28(1-2):62-74.

PMID: 7348447

Matched MeSH terms: Genetics, Population*

Fulltext Prolonged apnoea after suxamethonium in a Malaysian patient due to silent plasma cholinesterase--first case report

Mohandas K, Sivaneswaran N

Med J Malaysia, 1982 Jun;37(2):157-9.

PMID: 7132835

A bnormal variants of plasma cholinesterase (ChE, EC. 3.1.1.8) are a rarity in this region and to date there is no reported case of suxamethonium sensitivity in the Malaysian population. We now report a case of a Malaysian Indian patient who received suxamethonium, developed prolonged apnoea and on investigation was found to be a homozygote for the silent gene. His family was screened for abnormal variants of plasma cholinesterase. The results are discussed.

Matched MeSH terms: Cholinesterases/genetics

Fulltext Morbidity in Alagille syndrome in 6 Malaysian children

Lim CB, Choy YS

Med J Malaysia, 2003 Dec;58(5):641-6.

PMID: 15190647 MyJurnal

We retrospectively studied the records of 6 Malaysian children who were diagnosed with Alagille Syndrome (AGS) according to this criteria from January 1999 to January 2001, at the Institute of Paediatrics, Kuala Lumpur Hospital. Four patients (66%) had a positive family history. Thirteen individuals (6 patients and 7 relatives) were diagnosed with AGS in these 5 families. Only 6/13 (46%) of them presented with liver involvement. All 6 patients presented with typical facies and cholestasis (100%). Three (50%) presented with portal hypertension (PHT) with synthetic liver dysfunction (1 died), 1/6 (17%) have PHT and normal synthetic liver function. Two have cleared their jaundice but have biochemical evidence of hepatitis and hepatomegaly, four have congenital heart disease 5/6 posterior embryotoxon, 2/6 butterfly vertebrae, 4/6 hyperlipidaemia and 4/6 failure to thrive. One patient has a Jagged-1 gene disruption at the translocation breakpoint locus 20p12.3 2n = 46,XX,t(12.20) (q22, p12.3). 5/6 (83%) are still alive. Two-thirds of our patients developed chronic liver disease by 3 years of age. Two-thirds of the index patients have a family history. Only 46% of individuals in these families have clinical evidence of liver involvement. Mortality depends on cardiac/renal disease, end-stage liver failure and intercurrent infection.

Matched MeSH terms: Alagille Syndrome/genetics

Molecular epidemiology of enterovirus 71 infection in the Western Pacific Region

Shimizu H, Utama A, Onnimala N, Li C, Li-Bi Z, Yu-Jie M, et al.

Pediatr Int, 2004 Apr;46(2):231-5.

PMID: 15056257

Recently, there have been large outbreaks of hand, foot and mouth disease (HFMD) mainly caused by enterovirus 71 (EV71) associated with severe neurological diseases in the Western Pacific Region (WPR). To monitor the realtime trend of EV71 transmission throughout the WPR, the authors conducted a molecular epidemiological analysis of EV71 infection.

Matched MeSH terms: Enterovirus/genetics*

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