Retention and loss of RNA interference pathways in trypanosomatid protozoans.
RNA interference (RNAi) pathways are widespread in metaozoans but the genes required show variable occurrence or activity in eukaryotic microbes, including many pathogens. While some Leishmania lack RNAi activity and Argonaute or Dicer genes, we show that Leishmania braziliensis and other species wi...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Public Library of Science (PLoS)
2010-10-01
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| Series: | PLoS Pathogens |
| Online Access: | http://europepmc.org/articles/PMC2965760?pdf=render |
| _version_ | 1819002020955160576 |
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| author | Lon-Fye Lye Katherine Owens Huafang Shi Silvane M F Murta Ana Carolina Vieira Salvatore J Turco Christian Tschudi Elisabetta Ullu Stephen M Beverley |
| author_facet | Lon-Fye Lye Katherine Owens Huafang Shi Silvane M F Murta Ana Carolina Vieira Salvatore J Turco Christian Tschudi Elisabetta Ullu Stephen M Beverley |
| author_sort | Lon-Fye Lye |
| collection | DOAJ |
| description | RNA interference (RNAi) pathways are widespread in metaozoans but the genes required show variable occurrence or activity in eukaryotic microbes, including many pathogens. While some Leishmania lack RNAi activity and Argonaute or Dicer genes, we show that Leishmania braziliensis and other species within the Leishmania subgenus Viannia elaborate active RNAi machinery. Strong attenuation of expression from a variety of reporter and endogenous genes was seen. As expected, RNAi knockdowns of the sole Argonaute gene implicated this protein in RNAi. The potential for functional genetics was established by testing RNAi knockdown lines lacking the paraflagellar rod, a key component of the parasite flagellum. This sets the stage for the systematic manipulation of gene expression through RNAi in these predominantly diploid asexual organisms, and may also allow selective RNAi-based chemotherapy. Functional evolutionary surveys of RNAi genes established that RNAi activity was lost after the separation of the Leishmania subgenus Viannia from the remaining Leishmania species, a divergence associated with profound changes in the parasite infectious cycle and virulence. The genus Leishmania therefore offers an accessible system for testing hypothesis about forces that may select for the loss of RNAi during evolution, such as invasion by viruses, changes in genome plasticity mediated by transposable elements and gene amplification (including those mediating drug resistance), and/or alterations in parasite virulence. |
| first_indexed | 2024-12-20T22:58:28Z |
| format | Article |
| id | doaj.art-1fcb4d00ea514a49ab5bd6baa20fc9ce |
| institution | Directory Open Access Journal |
| issn | 1553-7366 1553-7374 |
| language | English |
| last_indexed | 2024-12-20T22:58:28Z |
| publishDate | 2010-10-01 |
| publisher | Public Library of Science (PLoS) |
| record_format | Article |
| series | PLoS Pathogens |
| spelling | doaj.art-1fcb4d00ea514a49ab5bd6baa20fc9ce2022-12-21T19:24:04ZengPublic Library of Science (PLoS)PLoS Pathogens1553-73661553-73742010-10-01610e100116110.1371/journal.ppat.1001161Retention and loss of RNA interference pathways in trypanosomatid protozoans.Lon-Fye LyeKatherine OwensHuafang ShiSilvane M F MurtaAna Carolina VieiraSalvatore J TurcoChristian TschudiElisabetta UlluStephen M BeverleyRNA interference (RNAi) pathways are widespread in metaozoans but the genes required show variable occurrence or activity in eukaryotic microbes, including many pathogens. While some Leishmania lack RNAi activity and Argonaute or Dicer genes, we show that Leishmania braziliensis and other species within the Leishmania subgenus Viannia elaborate active RNAi machinery. Strong attenuation of expression from a variety of reporter and endogenous genes was seen. As expected, RNAi knockdowns of the sole Argonaute gene implicated this protein in RNAi. The potential for functional genetics was established by testing RNAi knockdown lines lacking the paraflagellar rod, a key component of the parasite flagellum. This sets the stage for the systematic manipulation of gene expression through RNAi in these predominantly diploid asexual organisms, and may also allow selective RNAi-based chemotherapy. Functional evolutionary surveys of RNAi genes established that RNAi activity was lost after the separation of the Leishmania subgenus Viannia from the remaining Leishmania species, a divergence associated with profound changes in the parasite infectious cycle and virulence. The genus Leishmania therefore offers an accessible system for testing hypothesis about forces that may select for the loss of RNAi during evolution, such as invasion by viruses, changes in genome plasticity mediated by transposable elements and gene amplification (including those mediating drug resistance), and/or alterations in parasite virulence.http://europepmc.org/articles/PMC2965760?pdf=render |
| spellingShingle | Lon-Fye Lye Katherine Owens Huafang Shi Silvane M F Murta Ana Carolina Vieira Salvatore J Turco Christian Tschudi Elisabetta Ullu Stephen M Beverley Retention and loss of RNA interference pathways in trypanosomatid protozoans. PLoS Pathogens |
| title | Retention and loss of RNA interference pathways in trypanosomatid protozoans. |
| title_full | Retention and loss of RNA interference pathways in trypanosomatid protozoans. |
| title_fullStr | Retention and loss of RNA interference pathways in trypanosomatid protozoans. |
| title_full_unstemmed | Retention and loss of RNA interference pathways in trypanosomatid protozoans. |
| title_short | Retention and loss of RNA interference pathways in trypanosomatid protozoans. |
| title_sort | retention and loss of rna interference pathways in trypanosomatid protozoans |
| url | http://europepmc.org/articles/PMC2965760?pdf=render |
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