Differential gene expression and novel gene models in 110 Richter uncovered through RNA Sequencing of roots under stress
The appearance of the Phylloxera pest in the 19th century in Europe caused dramatical damages in grapevine diversity. To mitigate these losses, grapevine growers resorted to using crosses of different Vitis species, such as 110 Richter (110R) (V. berlandieri x V. rupestris), which has been invaluable for studying adaptations to stress responses in vineyards. Recently, a high quality chromosome scale assembly of 110R was released, but the available gene models were predicted without using as evidence transcriptional sequences obtained from roots, that are crucial organs in rootstock, and they may express certain genes exclusively. Therefore, we employed RNA sequencing reads of 110R roots under different stress conditions to predict new gene models in each haplotype of 110R under different stresses. We discovered 1,174 and 1,245 new genes for the V. rupestris and V. berlandieri haplotype, respectively. We profiled gene expression on the newly generated transcriptome and identified differentially expressed genes (DEGs) under different stress conditions. Interestingly, among the DEGs we identified different functions on each haplotype, hinting at specific contributions from each parental genome, such as ion transportation or biological process involved in interspecies interaction between organisms. These results demonstrate the value of integrating expression data from more tissues to increase the detection of genes during genome annotations and highlight the value of diploid phased genome references to investigate the contributions of each parental genome in hybrid organisms.
Acknowledgements: Special acknowledgement to the Spanish government grant PRE2019-088446 and the project PID2021-125575OR-C21
1) Velt A. et al. (2023). An improved reference of the grapevine genome reasserts the origin of the PN40024 highly homozygous genotype. G3-GENES GENOM GENET, 13 (5) jkad067, DOI 10.1093/g3journal/jkad067
2) Minio A. et al. (2022). HiFi chromosome-scale diploid assemblies of the grape rootstocks 110R, Kober 5BB, and 101–14 Mgt. Sci. Data., 9: 660, DOI 10.1038/s41597-022-01753-0
Issue: ICGWS 2023
1Center for Plant Biotechnology and Genomics (CBGP-UPM-INIA-CSIC)-Universidad Politécnica de Madrid, Campus Montegancedo UPM, Madrid, Spain