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Title of Journal: Virus Genes

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Abbravation: Virus Genes

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Springer US

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10.1007/s12034-008-0029-x

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1572-994X

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Resistance gene analogs involved in tolerant cassa

Authors: Bengyella Louis Chrissie Rey
Publish Date: 2015/09/14
Volume: 51, Issue: 3, Pages: 393-407
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Abstract

The current literature describes recovery from virusinduced symptoms as a RNA silencing defense but immunityrelated genes including the structurally specific resistance gene analogs RGAs that may play a key role in tolerance and recovery is not yet reported In this study the transcriptome data of tolerant cassava TME3 which exhibits a recovery phenotype and susceptible cassava T200 infected with South African cassava mosaic virus were explored for RGAs Putative resistance protein analogs RPAs with amidelike indole3acetic acid–IleLeuArg IAAILR and leucinerich repeat LRRkinase conserved domains were unique to TME3 Common responsive RPAs in TME3 and T200 were the dirigentlike protein coil–coil nucleotidebinding site NBS and tollinterleukinresistance disease resistance zinc finger chromosome condensationlike protein DZC and NBSapoptosis repressor with caspase recruitment ARC–LRR domains Mutations in RPAs in the MHD motif of the NBSARC2 subdomain associated with the recovery phase in TME3 were observed Additionally a cohort of 25 RGAs mined solely during the recovery process in TME3 was identified Phylogenetic and expression analyses support that diverse RGAs are differentially expressed during tolerance and recovery This study reveals that in cassava a perennial crop RGAs participate in tolerance and differentially accumulate during recovery as a complementary defense mechanism to natural occurring RNA silencing to impair viral replicationL Bengyella was supported by URC postdoctoral funding from the School of Molecular and Cell Biology CESM130203 the University of the Witwatersrand Johannesburg South Africa and the National Research Foundation NRF for funding We thank Farhahna Allie Michal J Okoniewski and Erica J Pierce who participated in generating the primary transcriptome data based on SACMV infection of cassava T200 and TME3 as part of a study in the Plant Biotechology Programme of Prof Chrissie Rey

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