Suggested role for G4 DNA in recombinational switching at the antigenic variation locus of the Lyme disease spirochete.
Antigenic variation through targeted DNA rearrangements provides a powerful diversity generating mechanism that allows a variety of pathogens to stay one step ahead of acquired immunity in their hosts. The Lyme disease spirochete encodes such a system that is required for persistent infection. The v...
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| Format: | Article |
| Language: | English |
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Public Library of Science (PLoS)
2013-01-01
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| Series: | PLoS ONE |
| Online Access: | http://europepmc.org/articles/PMC3585125?pdf=render |
| _version_ | 1811290859853840384 |
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| author | Rupali Walia George Chaconas |
| author_facet | Rupali Walia George Chaconas |
| author_sort | Rupali Walia |
| collection | DOAJ |
| description | Antigenic variation through targeted DNA rearrangements provides a powerful diversity generating mechanism that allows a variety of pathogens to stay one step ahead of acquired immunity in their hosts. The Lyme disease spirochete encodes such a system that is required for persistent infection. The vls locus, carried on a 29 kb linear plasmid (lp28-1) in the type strain B31, carries 15 silent cassettes from which information is unidirectionally transferred into the expression locus, vlsE. Recent studies have surprisingly shown that, with the exception of the RuvAB branch migrase, no other known recombination/repair proteins appear to play a role in the recombinational switching process. In the work presented here we show that G4 DNA can be formed by sequences within the B31 vlsE locus, prompting us to investigate the presence of potential G4-forming DNA throughout the vls locus of several Lyme spirochete strains and species. We found that runs of G, three nucleotides and longer occur at a very high density, with a greater than 100-fold strand-specific distribution in the vls locus of three B. burgdorferi strains as well as in B. afzelii and B. garinii, in spite of the bias for the use of A-T rich codons in Borrelia species. Our findings suggest the possibility that G4 DNA may be a mediator of recombinational switching at the vlsE locus in the Lyme spirochetes. |
| first_indexed | 2024-04-13T04:20:43Z |
| format | Article |
| id | doaj.art-cf20fb8653074fbfb6bb14dd6697c8db |
| institution | Directory Open Access Journal |
| issn | 1932-6203 |
| language | English |
| last_indexed | 2024-04-13T04:20:43Z |
| publishDate | 2013-01-01 |
| publisher | Public Library of Science (PLoS) |
| record_format | Article |
| series | PLoS ONE |
| spelling | doaj.art-cf20fb8653074fbfb6bb14dd6697c8db2022-12-22T03:02:48ZengPublic Library of Science (PLoS)PLoS ONE1932-62032013-01-0182e5779210.1371/journal.pone.0057792Suggested role for G4 DNA in recombinational switching at the antigenic variation locus of the Lyme disease spirochete.Rupali WaliaGeorge ChaconasAntigenic variation through targeted DNA rearrangements provides a powerful diversity generating mechanism that allows a variety of pathogens to stay one step ahead of acquired immunity in their hosts. The Lyme disease spirochete encodes such a system that is required for persistent infection. The vls locus, carried on a 29 kb linear plasmid (lp28-1) in the type strain B31, carries 15 silent cassettes from which information is unidirectionally transferred into the expression locus, vlsE. Recent studies have surprisingly shown that, with the exception of the RuvAB branch migrase, no other known recombination/repair proteins appear to play a role in the recombinational switching process. In the work presented here we show that G4 DNA can be formed by sequences within the B31 vlsE locus, prompting us to investigate the presence of potential G4-forming DNA throughout the vls locus of several Lyme spirochete strains and species. We found that runs of G, three nucleotides and longer occur at a very high density, with a greater than 100-fold strand-specific distribution in the vls locus of three B. burgdorferi strains as well as in B. afzelii and B. garinii, in spite of the bias for the use of A-T rich codons in Borrelia species. Our findings suggest the possibility that G4 DNA may be a mediator of recombinational switching at the vlsE locus in the Lyme spirochetes.http://europepmc.org/articles/PMC3585125?pdf=render |
| spellingShingle | Rupali Walia George Chaconas Suggested role for G4 DNA in recombinational switching at the antigenic variation locus of the Lyme disease spirochete. PLoS ONE |
| title | Suggested role for G4 DNA in recombinational switching at the antigenic variation locus of the Lyme disease spirochete. |
| title_full | Suggested role for G4 DNA in recombinational switching at the antigenic variation locus of the Lyme disease spirochete. |
| title_fullStr | Suggested role for G4 DNA in recombinational switching at the antigenic variation locus of the Lyme disease spirochete. |
| title_full_unstemmed | Suggested role for G4 DNA in recombinational switching at the antigenic variation locus of the Lyme disease spirochete. |
| title_short | Suggested role for G4 DNA in recombinational switching at the antigenic variation locus of the Lyme disease spirochete. |
| title_sort | suggested role for g4 dna in recombinational switching at the antigenic variation locus of the lyme disease spirochete |
| url | http://europepmc.org/articles/PMC3585125?pdf=render |
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