Base de dados : HANSEN
Pesquisa : REPETICOES DE MICROSSATELITES [Descritor de assunto]
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Id:23198
Autor:Zhang, Liangfen; Budiawan, Teky; Matsuoka, Masanori
Título:Diversity of potential short tandem repeats in Mycobacterium leprae and application for molecular typing
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Fonte:s.l; s.n; Oct. 2005. 9 p. tab.
Resumo:A recent advance in molecular typing for tracing the transmission of leprosy is the discovery of short tandem repeats (STRs) in Mycobacterium leprae. To substantiate polymorphic loci from STR as promising candidates for molecular typing tools in leprosy epidemiology, 44 STR loci including 33 microsatellites and 11 minisatellites were investigated among 27 laboratory strains by sequencing PCR products. Not all STRs were necessarily polymorphic. Thirty-two out of the 44 loci were polymorphic. Nine polymorphic loci were suitable for identifying genotypes according to the discriminatory capacity, stability, and reproducibility. All the strains were classified into independent genotypes by the selected nine loci. Three multi-case households were subjected to molecular typing. M. leprae obtained from household cases showed identical copy numbers by TTC triplet alone, but the isolates from one family contact case were divided into different genotypes by adding eight other polymorphic loci. The combination of information from multiple loci allows increasing levels of discrimination and it is likely that the generation and documentation of data will result in the choice of a potential molecular typing tool for leprosy epidemiology. (AU).
Descritores:Técnica de Tipagem Bacteriana/*
DNA Bacteriano/AN
Pé/MI
Marcadores Genéticos/*GE
Hanseníase/EP/MI
Camundongos Endogâmicos BALB C
Camundongos Nus
Repetições de Microssatélites/GE
Repetições Mini-Satélites/GE
Mycobacterium leprae/*CL/*GE
Análise de Sequência de DNA
Sequências Repetidas em Tandem/*GE
Variação (Genética)/*
Limites:Research Support, Non-U.S. Gov't
Camundongos
Humanos
Animais
Localização:BR191.1; 09342/s


  2 / 4 HANSEN  
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Id:23189
Autor:Young, Saroj K; Taylor, G. Michael; Jain, Suman; Suneetha, Lavanya M; Suneetha, Sujai; Lockwood, Diana N. J; Young, Douglas B
Título:Microsatellite mapping of Mycobacterium leprae populations in infected humans
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Fonte:s.l; s.n; Nov. 2004. 6 p. ilus, mapas, tab.
Resumo:To investigate genetic diversity in a bacterial population, we measured the copy numbers of simple sequence repeats, or microsatellites, in Mycobacterium leprae from patients living in and around Hyderabad, India. Three microsatellite loci containing trinucleotide or dinucleotide repeats were amplified from infected tissues, and the copy numbers were established by sequence analysis. Extensive diversity was observed in a cross-sectional survey of 33 patients, but closely related profiles were found for members of a multicase family likely to share a common transmission source. Sampling of multiple tissues from single individuals demonstrated identical microsatellite profiles in the skin, nasal cavity, and bloodstream but revealed differences at one or more loci for M. leprae present in nerves. Microsatellite mapping of M. leprae represents a useful tool for tracking short transmission chains. Comparison of skin and nerve lesions suggests that the evolution of disease within an individual involves the expansion of multiple distinct subpopulations of M. leprae. (AU).
Descritores:Técnica de Tipagem Bacteriana/*
Estudos Transversais
Família
Dosagem de Genes
Hanseníase/EP/*MI/*TM
Repetições de Microssatélites/*GE
Mycobacterium leprae/*CL/*GE
Reação em Cadeia da Polimerase
Especificidade de Espécies
Variação (Genética)/*
Limites:HUMANO
MASCULINO
FEMININO
SUPPORT, NON-U.S. GOV'T
Localização:BR191.1; 09333/s


  3 / 4 HANSEN  
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Id:18573
Autor:Mira, Marcelo T; Alcais, Alexandre; Van Thuc, Nguyen; Thai, Vu Hong; Huong, Nguyen Thu; Ba, Nguyen Ngoc; Verner, Andrei; Hudson, Thomas J; Abel, Laurent; Schurr, Erwin
Título:Chromosome 6q25 is linked to susceptibility to leprosy in a Vietnamese population
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Fonte:s.l; s.n; 2003. 4 p. tab, graf.
Resumo:Leprosy, a chronic infectious disease caused by Mycobacterium leprae, affects an estimated 700,000 persons each year. Clinically, leprosy can be categorized as paucibacillary or multibacillary disease. These clinical forms develop in persons that are intrinsically susceptible to leprosy per se, that is, leprosy independent of its specific clinical manifestation. We report here on a genome-wide search for loci controlling susceptibility to leprosy per se in a panel of 86 families including 205 siblings affected with leprosy from Southern Vietnam. Using model-free linkage analysis, we found significant evidence for a susceptibility gene on chromosome region 6q25 (maximum likelihood binomial (MLB) lod score 4.31; P = 5 x 10(-6)). We confirmed this by family-based association analysis in an independent panel of 208 Vietnamese leprosy simplex families. Of seven microsatellite markers underlying the linkage peak, alleles of two markers (D6S1035 and D6S305) showed strong evidence for association with leprosy (P = 6.7 x 10(-4) and P = 5.9 x 10(-5), respectively). (AU).
Descritores:ALELOS
CROMOSSOMOS HUMANOS PAR 10/genet
CROMOSSOMOS HUMANOS PAR 6/genet
REPETICOES DE MICROSSATELITES
VIETNA
HANSENIASE/genet
LIGACAO (GENETICA)
ESCORE LOD
Limites:HUMANO
MASCULINO
FEMININO
SUPPORT, NON-U.S. GOV'T
Meio Eletrônico: - .
Localização:BR191.1; 08992/s


  4 / 4 HANSEN  
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Id:18475
Autor:Tosh, Kerrie; Meisner, Sarah; Siddiqui, M. Ruby; Balakrishnan, Karuppiah; Ghei, Satish; Golding, Marina; Sengupta, Utpal; Pitchappan, Ramasamy M; Hill, Adrian V. S
Título:A region of chromosome 20 is linked to leprosy susceptibility in a South Indian population
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Fonte:s.l; s.n; 2002. 4 p. tab, graf.
Resumo:A major susceptibility locus for leprosy has recently been mapped on chromosome 10 (10p13) by genome-wide linkage analysis. Microsatellite markers from this genome screen that showed suggestive evidence of linkage to leprosy were evaluated in an additional 140 families with affected sib pairs. A second region of linkage has thus been identified on chromosome 20 (20p12). The peak of linkage lies at marker D20S115, which has a significant single-point maximum logarithm of odds score of 3.48 (P=.00003). Transmission disequilibrium testing of the microsatellite markers in 20p12 showed that the marker D20S835 is associated with protection against leprosy (P=.021), which suggests that a locus controlling susceptibility lies close to this marker. (AU).
Descritores:MAPEAMENTO CROMOSSÔMICO
CROMOSSOMOS HUMANOS PAR 20/genet
MARCADORES GENETICOS/genet
PREDISPOSICAO GENETICA PARA DOENÇA/genet
GENETICA POPULACIONAL
HANSENIASE/genet
REPETICOES DE MICROSSATELITES/genet
MYCOBACTERIUM LEPRAE
INDIA
Limites:HUMANO
MASCULINO
FEMININO
SUPPORT, NON-U.S. GOV'T
Meio Eletrônico: - .
Localização:BR191.1; 08997/s



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