Scientists have produced a detailed molecular dataset comparing domesticated foxtail millet (Setaria italica) with its wild ancestor, Setaria viridis, offering researchers a new resource for studying how RNA regulation may have changed during crop domestication.

The research, published in Scientific Data, focuses on N6-methyladenosine (m6A), an important chemical modification of messenger RNA. Unlike changes to the underlying DNA sequence, these modifications form part of the epitranscriptome and can influence how RNA is processed and how genes function. The researchers note that m6A is involved in plant growth and immune responses, while its evolution during plant domestication remains comparatively underexplored.

Researchers combined RNA sequencing (RNA-seq) and MeRIP-seq to compare the cultivated foxtail millet variety Yugu1 with the wild S. viridis accession A10.

The analysis identified 6,928 m6A peaks associated with 6,407 protein-coding genes in domesticated Yugu1. In its wild ancestor, researchers detected 6,274 peaks associated with 5,858 genes. The team also examined differences in gene expression and RNA methylation between the two plants.

When methylation changes were integrated with gene-expression data, researchers found 209 hyper-methylated peaks associated with increased transcription and 90 hypo-methylated peaks associated with reduced transcription. Functional analyses using GO and KEGG pathways were then used to investigate the biological roles represented within these differences.

The findings do not establish that individual RNA modifications directly caused foxtail millet's domestication traits. Instead, the study provides a dataset and comparative molecular framework that researchers can use to investigate how m6A regulation may relate to domestication and crop biology.

That distinction is important for Millets.News. This is fundamentally a research-resource story, rather than the announcement of a newly developed millet variety or an immediately deployable breeding technology.

Nevertheless, understanding the molecular differences between cultivated millet and its wild relatives could provide valuable foundations for future investigations into crop evolution, gene regulation and millet improvement.