Pangenomic origins of evolutionary rescue in a staple crop

This repository includes multiple sequence alignments and phylogenetic
trees of RMES1-like genes in the sorghum pangenome and across Poaceae. The
recent adaptation of the cereal crop sorghum to a global aphid outbreak
was a fortuitous case of evolutionary rescue, but the pangenomic and
molecular basis is not known. The sorghum pangenome contains extensive
copy number variation at the locus and a segmental duplication on Chr10
(Fig. S9). The causative NLRs (RMES1A and RMES1B) lack signaling domains
and have ATPase mutations expected to abrogate function (Fig. 4f),
suggesting RMES1 NLRs regulate immunity via a noncanonical mechanism. The
RMES1 NLR family is ancient, orthologous to phloem-feeding resistance
genes in rice (Fig 5b) and syntenic across the grass super-pangenome (Fig.
5b, 5c). Thus, gene birth-and-death processes at an ancient gene cluster
created rare standing variation and provided the adaptive allele for
evolutionary rescue.