Genome-wide RNAi selection identifies a regulator of transmission stage-enriched gene families and cell-type differentiation in Trypanosoma brucei

Eva Rico, Alasdair Ivens, Lucy Glover, David Horn, Keith R. Matthews (Lead / Corresponding author)

Research output: Contribution to journalArticle

11 Citations (Scopus)
168 Downloads (Pure)

Abstract

Trypanosoma brucei, causing African sleeping-sickness, exploits quorum-sensing (QS) to generate the 'stumpy forms' necessary for the parasite's transmission to tsetse-flies. These quiescent cells are generated by differentiation in the bloodstream from proliferative slender forms. Using genome-wide RNAi selection we screened for repressors of transmission stage-enriched mRNAs in slender forms, using the stumpy-elevated ESAG9 transcript as a model. This identified REG9.1, whose RNAi-silencing alleviated ESAG9 repression in slender forms and tsetse-midgut procyclic forms. Interestingly, trypanosome surface protein Family 5 and Family 7 mRNAs were also elevated, which, like ESAG9, are T. brucei specific and stumpy-enriched. We suggest these contribute to the distinct transmission biology and vector tropism of T. brucei from other African trypanosome species. As well as surface family regulation, REG9.1-depletion generated QS-independent development to stumpy forms in vivo, whereas REG9.1 overexpression in bloodstream forms potentiated spontaneous differentiation to procyclic forms in the absence of an external signal. Combined, this identifies REG9.1 as a regulator of developmental cell fate, controlling the expression of Trypanosoma brucei-specific molecules elevated during transmission.

Original languageEnglish
Article numbere1006279
Pages (from-to)1-25
Number of pages25
JournalPLoS Pathogens
Volume13
Issue number3
DOIs
Publication statusPublished - 23 Mar 2017

Fingerprint Dive into the research topics of 'Genome-wide RNAi selection identifies a regulator of transmission stage-enriched gene families and cell-type differentiation in <i>Trypanosoma brucei</i>'. Together they form a unique fingerprint.

  • Cite this