Copy Number Variation and Transcriptional Polymorphisms of Phytophthora sojae RXLR Effector Genes Avr1a and Avr3a
Dinah Qutob,Jennifer Tedman-Jones,Suomeng Dong,Suomeng Dong,Kuflom Kuflu,Hai Pham,Yuanchao Wang,Daolong Dou,Daolong Dou,Shiv D. Kale,Felipe D. Arredondo,Brett M. Tyler,Mark Gijzen +12 more
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TLDR
The Phytophthora sojae avirulence genes Avr1a and Avr3a are identified and it is demonstrated how each of these Avr genes display copy number variation in different strains of P.Sojae.Abstract:
The importance of segmental duplications and copy number variants as a source of genetic and phenotypic variation is gaining greater appreciation, in a variety of organisms. Now, we have identified the Phytophthora sojae avirulence genes Avr1a and Avr3a and demonstrate how each of these Avr genes display copy number variation in different strains of P. sojae. The Avr1a locus is a tandem array of four near-identical copies of a 5.2 kb DNA segment. Two copies encoding Avr1a are deleted in some P. sojae strains, causing changes in virulence. In other P. sojae strains, differences in transcription of Avr1a result in gain of virulence. For Avr3a, there are four copies or one copy of this gene, depending on the P. sojae strain. In P. sojae strains with multiple copies of Avr3a, this gene occurs within a 10.8 kb segmental duplication that includes four other genes. Transcriptional differences of the Avr3a gene among P. sojae strains cause changes in virulence. To determine the extent of duplication within the superfamily of secreted proteins that includes Avr1a and Avr3a, predicted RXLR effector genes from the P. sojae and the P. ramorum genomes were compared by counting trace file matches from whole genome shotgun sequences. The results indicate that multiple, near-identical copies of RXLR effector genes are prevalent in oomycete genomes. We propose that multiple copies of particular RXLR effectors may contribute to pathogen fitness. However, recognition of these effectors by plant immune systems results in selection for pathogen strains with deleted or transcriptionally silenced gene copies.read more
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Transcriptional Programming and Functional Interactions within the Phytophthora sojae RXLR Effector Repertoire
Qunqing Wang,Changzhi Han,Adriana O. Ferreira,Xiaoli Yu,Wenwu Ye,Sucheta Tripathy,Shiv D. Kale,Biao Gu,Biao Gu,Yuting Sheng,Yangyang Sui,Xiaoli Wang,Zhengguang Zhang,Baoping Cheng,Suomeng Dong,Weixing Shan,Xiaobo Zheng,Xiaobo Zheng,Daolong Dou,Daolong Dou,Daolong Dou,Brett M. Tyler,Yuanchao Wang,Yuanchao Wang +23 more
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