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Autor     Niyaz Ahmed, Leonardo A Sechi
Titel    Helicobacter pylori and gastroduodenal pathology: New threats of the old friend
Zeitschrift    Annals of Clinical Microbiology and Antimicrobials
Ausgabe    4
Datum    5. January 2005
Nummer    1
DOI    10.1186/1476-0711-4-1
URL    http://www.ncbi.nlm.nih.gov/pmc/articles/PMC544872/pdf/1476-0711-4-1.pdf

Literaturverz.   

no
Fußnoten    no
Fragmente    3


Fragmente der Quelle:
[1.] Wfe/Fragment 009 24 - Diskussion
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Ahmed and Sechi 2005, Fragment, Gesichtet, SMWFragment, Schutzlevel sysop, Verschleierung, Wfe

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H. pylori is usually acquired during childhood, with transmission occurring predominantly within families (Tindberg et al., 2001; Kivi et al., 2003; Kivi and Tindberg, 2006). Some studies have demonstrated the possible co-existence of a large array of clonal lineages within H. pylori populations evolving within each individual in isolation from one another (Suerbaum et al., 1998; Han et al., 2000; Owen and Xerry, 2003).

Drumm, B., G. I. Perez-Perez, M. J. Blaser, and P. M. Sherman, Intrafamilial clustering of Helicobacter pylori infection, N Engl J Med, 322, 359-363, 1990.

Han, S. R., H. C. Zschausch, H. G. Meyer, T. Schneider, M. Loos, S. Bhakdi, and M. J. Maeurer, Helicobacter pylori: clonal population structure and restricted transmission within families revealed by molecular typing, J Clin Microbiol, 38, 3646-3651, 2000.

Kivi, M., and Y. Tindberg, Helicobacter pylori occurrence and transmission: a family affair?, Scand J Infect Dis, 38, 407-417, 2006.

Kivi, M., Y. Tindberg, M. Sörberg, T. H. Casswall, R. Befrits, P. M. Hellström, C. Bengtsson, L. Engstrand, and M. Granström, Concordance of Helicobacter pylori strains within families, J Clin Microbiol, 41, 5604-5608, 2003.

Owen, R. J., and J. Xerry, Tracing clonality of Helicobacter pylori infecting family members from analysis of DNA sequences of three housekeeping genes (ureI, atpA and ahpC), deduced amino acid sequences, and pathogenicity-associated markers (cagA and vacA), J Med Microbiol, 52, 515-524, 2003.

Suerbaum, S., J. M. Smith, K. Bapumia, G. Morelli, N. H. Smith, E. Kunstmann, I. Dyrek, and M. Achtman, Free recombination within Helicobacter pylori, Proc Natl Acad Sci U S A, 95, 12,619-12,624, 1998.

Tindberg, Y., C. Bengtsson, F. Granath, M. Blennow, O. Nyrén, and M. Granström, Helicobacter pylori infection in Swedish school children: lack of evidence of child-to-child transmission outside the family, Gastroenterology, 121, 310-316, 2001.

H. pylori infection is usually acquired during childhood, where transmission occurs predominantly within families [13]. A couple of recent studies demonstrated the possible co-existence of a large array of clonal lineages within H. pylori populations that are evolving in each individual separately from one another [14,10].

10. Owen RJ, Xerry J: Tracing clonality of Helicobacter pylori infecting family members from analysis of DNA sequences of three housekeeping genes (ureI, atpA and ahpC), deduced amino acid sequences, and pathogenicity-associated markers (cagA and vacA). J Med Microbiol 2003, 52:515-524.

13. Drumm B, Perez-Perez GI, Blaser MJ, Sherman PM: Intrafamilial clustering of Helicobacter pylori infection. N Engl J Med 1990, 322:359-363.

14. Han SR, Zschausch HC, Meyer HG, Schneider T, Loos M, Bhakdi S, Maeurer MJ: Helicobacter pylori: clonal population structure and restricted transmission within families revealed by molecular typing. J Clin Microbiol 2000, 38:3646-3651.

Anmerkungen

Nothing has been marked as a citation; the source is not given.

Sichter
(Graf Isolan) Schumann

[2.] Wfe/Fragment 010 05 - Diskussion
Zuletzt bearbeitet: 2016-01-09 22:07:35 Hindemith
Ahmed and Sechi 2005, Fragment, Gesichtet, SMWFragment, Schutzlevel sysop, Verschleierung, Wfe

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World-wide studies of H. pylori isolates from different geographical regions demonstrated weak clonal groupings and geographical partitioning of H. pylori isolates (Achtman et al., 1999; Carroll et al., 2003). [...] Should recombination only occur between a resident H. pylori population, exchange of genetic sequences can homogenise this population. The introduction of polymorphisms and sequence variants from one H. pylori population specific to a particular geographical region to another H. pylori population from a different geographical region via human migration makes the association of particular genotypes with specific geographical locations more difficult. Although this introduction of new polymorphisms into a particular H. pylori population poses a problem with identifying specific genotypes within certain geographical locales, it may, provide information on the ancestry of the hosts. Different studies have been aimed at identifying whether H. pylori was introduced to Latin America via European or Asian migrant populations (Kersulyte et al., 2000; Ghose et al., 2002). However, a recent study by Falush et al. (Falush et al., 2003b) showed that sequence analysis of H. pylori isolates obtained from 27 countries displayed geographical partitioning.

Achtman, M., T. Azuma, D. E. Berg, Y. Ito, G. Morelli, Z. J. Pan, S. Suerbaum, S. A. Thompson, A. van der Ende, and L. J. van Doorn, Recombination and clonal groupings within Helicobacter pylori from different geographical regions, Mol Microbiol, 32, 459-470, 1999.

Carroll, I. M., N. Ahmed, S. M. Beesley, A. A. Khan, S. Ghousunnissa, C. A. Moráin, and C. J. Smyth, Fine-structure molecular typing of Irish Helicobacter pylori isolates and their genetic relatedness to strains from four different continents, J Clin Microbiol, 41, 5755-5759, 2003.

Falush, D., T. Wirth, B. Linz, J. K. Pritchard, M. Stephens, M. Kidd, M. J. Blaser, D. Y. Graham, S. Vacher, G. I. Perez-Perez, Y. Yamaoka, F. Mégraud, K. Otto, U. Reichard, E. Katzowitsch, X. Wang, M. Achtman, and S. Suerbaum, Traces of human migrations in Helicobacter pylori populations, Science, 299, 1582-1585, 2003b.

Ghose, C., G. I. Perez-Perez, M. G. Dominguez-Bello, D. T. Pride, C. M. Bravi, and M. J. Blaser, East Asian genotypes of Helicobacter pylori strains in Amerindians provide evidence for its ancient human carriage, Proc Natl Acad Sci U S A, 99, 15,107-15,111, 2002.

Kersulyte, D., A. K. Mukhopadhyay, B. Velapatiño, W. Su, Z. Pan, C. Garcia, V. Hernandez, Y. Valdez, R. S. Mistry, R. H. Gilman, Y. Yuan, H. Gao, T. Alarcón, M. López-Brea, G. Balakrish Nair, A. Chowdhury, S. Datta, M. Shirai, T. Nakazawa, R. Ally, I. Segal, B. C. Wong, S. K. Lam, F. O. Olfat, T. Borén, L. Engstrand, O. Torres, R. Schneider, J. E. Thomas, S. Czinn, and D. E. Berg, Differences in genotypes of Helicobacter pylori from different human populations, J Bacteriol, 182, 3210-3218, 2000.

In addition, worldwide studies encompassing H. pylori isolates from many geographic regions have demonstrated weak clonal groupings and geographic partitioning of H. pylori isolates [9,17]. If recombination only occurs between a resident H. pylori population, exchange of genetic sequences can genetically homogenise this population. [...]

Introduction of polymorphisms and sequence variants from one H. pylori population from a particular geographic region to another H. pylori population from another geographic region via human migration makes the association of particular genotypes with specific geographic locations more difficult. Although the introduction of new polymorphisms into a particular H. pylori population poses a problem with identifying specific genotypes within certain geographic locales, it may, however, provide information on the ancestry of the hosts in whose stomachs the strains were carried. Studies have been aimed at demonstrating the path of human migration to Latin America with conflicting results regarding whether European or Asian populations brought H. pylori to South America [16,11]. However, a recent and comprehensive study by Flaush [sic] et al. [19] demonstrated that sequence analysis of H. pylori isolates recovered from twenty-seven countries displayed geographic partitioning.


9. Achtman M, Azuma T, Berg DE, Ito Y, Morelli G, Pan ZJ, Suerbaum S, Thompson SA, van der Ende A, van Doorn LJ: Recombination and clonal groupings within Helicobacter pylori from different geographical regions. Mol Microbiol 1999, 32:459-470.

11. Go MF: Helicobacter pylori: its role in ulcer disease and gastric cancer and how to detect the infection. Acta Gastroenterol Latinoam 1996, 26:45-49.

16. Kersulyte D, Mukhopadhyay AK, Velapatino B, Su W, Pan Z, Garcia C, Hernandez V, Valdez Y, Mistry RS, Gilman RH, Yuan Y, Gao H, Alarcon T, Lopez-Brea M, Balakrish Nair G, Chowdhury A, Datta S, Shirai M, Nakazawa T, Ally R, Segal I, Wong BC, Lam SK, Olfat FO, Boren T, Engstrand L, Torres O, Schneider R, Thomas JE, Czinn S, Berg DE: Differences in genotypes of Helicobacter pylori from different human populations. J Bacteriol 2000, 182:3210-3218.

17. Ahmed N, Khan AA, Alvi A, Tiwari S, Jyothirmayee CS, Kauser F, Ali M, Habibullah CM: Genomic analysis of Helicobacter pylori from Andhra Pradesh, South India: Molecular evidence for three major genetic clusters. Curr Sci 2003, 85:101-108.

19. Falush D, Wirth T, Linz B, Pritchard JK, Stephens M, Kidd M, Blaser MJ, Graham DY, Vacher S, Perez-Perez GI, Yamaoka Y, Megraud F, Otto K, Reichard U, Katzowitsch E, Wang X, Achtman M, Suerbaum S: Traces of human migrations in Helicobacter pylori populations. Science 2003, 299:1582-1585.

40. Carroll IM, Ahmed N, Beesley SM, Khan AA, Ghousunnissa S, O'Morain CA, Smyth CJ: Fine-structure molecular typing of Irish Helicobacter pylori isolates and their genetic relatedness to strains from four different continents. J Clin Microbiol 2003, 41:5755-5759.

Anmerkungen

Nothing has been marked as a citation; the source is not given.

Sichter
(Graf Isolan) Schumann

[3.] Wfe/Fragment 011 02 - Diskussion
Zuletzt bearbeitet: 2016-01-09 22:04:10 Hindemith
Ahmed and Sechi 2005, Fragment, Gesichtet, SMWFragment, Schutzlevel sysop, Verschleierung, Wfe

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Thus, polymorphisms within the H. pylori genome can be utilised as useful markers for studying ancient and recent human migrations. Albeit, recombination between H. pylori strains from migrant and native populations can sometimes complicate analysis. Therefore, the study of migrated populations that have remained in isolation from the native populations is essential (Carroll et al., 2004).

Carroll, I. M., A. A. Khan, and N. Ahmed, Revisiting the pestilence of helicobacter pylori: insights into geographical genomics and pathogen evolution, Infect Genet Evol, 4, 81-90, 2004.

Thus, polymorphisms within the H. pylori genome can serve as useful markers for studying ancient human migrations. However, a mix up of H. pylori strains between migrated and native populations can sometimes complicate analysis. Accordingly, the study of migrated populations that have remained isolated from the native populations is

essential.

Anmerkungen

Nothing has been marked as a citation; the source is not given.

Sichter
(Graf Isolan) Schumann

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