Characterizing the role of RNA silencing components in Cryptococcus neoformans

Guilhem Janbon, Shinae Maeng, Dong Hoon Yang, Young Joon Ko, Kwang Woo Jung, Frédérique Moyrand, Anna Floyd, Joseph Heitman, Yong Sun Bahn

Research output: Contribution to journalArticle

50 Citations (Scopus)

Abstract

The RNA interference (RNAi) mediated by homology-dependent degradation of the target mRNA with small RNA molecules plays a key role in controlling transcription and translation processes in a number of eukaryotic organisms. The RNAi machinery is also evolutionarily conserved in a wide variety of fungal species, including pathogenic fungi. To elucidate the physiological functions of the RNAi pathway in Cryptococcus neoformans that causes fungal meningitis, here we performed genetic analyses for genes encoding Argonaute (AGO1 and AGO2), RNA-dependent RNA polymerase (RDP1), and Dicers (DCR1 and DCR2) in both serotype A and D C. neoformans. The present study shows that Ago1, Rdp1, and Dcr2 are the major components of the RNAi process occurring in C. neoformans. However, the RNAi machinery is not involved in regulation of production of two virulence factors (capsule and melanin), sexual differentiation, and diverse stress response. Comparative transcriptome analysis of the serotype A and D RNAi mutants revealed that only modest changes occur in the genome-wide transcriptome profiles when the RNAi process was perturbed. Notably, the serotype D rdp1Δ mutants showed an increase in transcript abundance of active retrotransposons and transposons, such as T2 and T3, the latter of which is a novel serotype D-specific transposon of C. neoformans. In a wild type background both T2 and T3 were found to be weakly active mobile elements, although we found no evidence of Cnl1 retrotransposon mobility. In contrast, all three transposable elements exhibited enhanced mobility in the rdp1Δ mutant strain. In conclusion, the RNAi pathway plays an important role in controlling transposon activity and genome integrity of C. neoformans.

Original languageEnglish
Pages (from-to)1070-1080
Number of pages11
JournalFungal Genetics and Biology
Volume47
Issue number12
DOIs
Publication statusPublished - 2010 Dec 1

Fingerprint

Cryptococcus neoformans
RNA Interference
Retroelements
Fungal Meningitis
Genome
RNA Replicase
Sex Differentiation
DNA Transposable Elements
Melanins
RNA Stability
Gene Expression Profiling
Virulence Factors
Transcriptome
Capsules
Fungi
RNA
Serogroup

All Science Journal Classification (ASJC) codes

  • Microbiology
  • Genetics

Cite this

Janbon, Guilhem ; Maeng, Shinae ; Yang, Dong Hoon ; Ko, Young Joon ; Jung, Kwang Woo ; Moyrand, Frédérique ; Floyd, Anna ; Heitman, Joseph ; Bahn, Yong Sun. / Characterizing the role of RNA silencing components in Cryptococcus neoformans. In: Fungal Genetics and Biology. 2010 ; Vol. 47, No. 12. pp. 1070-1080.
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Janbon, G, Maeng, S, Yang, DH, Ko, YJ, Jung, KW, Moyrand, F, Floyd, A, Heitman, J & Bahn, YS 2010, 'Characterizing the role of RNA silencing components in Cryptococcus neoformans', Fungal Genetics and Biology, vol. 47, no. 12, pp. 1070-1080. https://doi.org/10.1016/j.fgb.2010.10.005

Characterizing the role of RNA silencing components in Cryptococcus neoformans. / Janbon, Guilhem; Maeng, Shinae; Yang, Dong Hoon; Ko, Young Joon; Jung, Kwang Woo; Moyrand, Frédérique; Floyd, Anna; Heitman, Joseph; Bahn, Yong Sun.

In: Fungal Genetics and Biology, Vol. 47, No. 12, 01.12.2010, p. 1070-1080.

Research output: Contribution to journalArticle

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