High allelic diversity in Arabidopsis NLRs is associated with distinct genomic features
- University of California, Berkeley, CA (United States)
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- University of California, Davis, CA (United States)
Plants rely on Nucleotide-binding, Leucine-rich repeat Receptors (NLRs) for pathogen recognition. Highly variable NLRs (hvNLRs) show remarkable intraspecies diversity, while their low-variability paralogs (non-hvNLRs) are conserved between ecotypes. At a population level, hvNLRs provide new pathogen-recognition specificities, but the association between allelic diversity and genomic and epigenomic features has not been established. Our investigation of NLRs in Arabidopsis Col-0 has revealed that hvNLRs show higher expression, less gene body cytosine methylation, and closer proximity to transposable elements than non-hvNLRs. hvNLRs show elevated synonymous and nonsynonymous nucleotide diversity and are in chromatin states associated with an increased probability of mutation. Diversifying selection maintains variability at a subset of codons of hvNLRs, while purifying selection maintains conservation at non-hvNLRs. How these features are established and maintained, and whether they contribute to the observed diversity of hvNLRs is key to understanding the evolution of plant innate immune receptors.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE; National Institutes of Health (NIH); Gordon and Betty Moore Inventor Fellowship
- Grant/Contract Number:
- AC02-05CH11231
- OSTI ID:
- 2470735
- Journal Information:
- EMBO Reports, Journal Name: EMBO Reports Journal Issue: 5 Vol. 25; ISSN 1469-3178
- Publisher:
- EMBO PressCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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