MicroRNA gene evolution in Arabidopsis lyrata and Arabidopsis thaliana

The Plant Cell
Noah FahlgrenJames C Carrington

Abstract

MicroRNAs (miRNAs) are short regulatory RNAs processed from partially self-complementary foldbacks within longer MIRNA primary transcripts. Several MIRNA families are conserved deeply through land plants, but many are present only in closely related species or are species specific. The finding of numerous evolutionarily young MIRNA, many with low expression and few if any targets, supports a rapid birth-death model for MIRNA evolution. A systematic analysis of MIRNA genes and families in the close relatives, Arabidopsis thaliana and Arabidopsis lyrata, was conducted using both whole-genome comparisons and high-throughput sequencing of small RNAs. Orthologs of 143 A. thaliana MIRNA genes were identified in A. lyrata, with nine having significant sequence or processing changes that likely alter function. In addition, at least 13% of MIRNA genes in each species are unique, despite their relatively recent speciation (approximately 10 million years ago). Alignment of MIRNA foldbacks to the Arabidopsis genomes revealed evidence for recent origins of 32 families by inverted or direct duplication of mostly protein-coding gene sequences, but less than half of these yield miRNA that are predicted to target transcripts from the originatin...Continue Reading

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Related Concepts

Conserved Sequence
Genes, Plant
MicroRNA Gene
Genome
Arabidopsis
Array-Based Comparative Genomic Hybridization
RNA, Small Temporal
Sequencing
Arabidopsis thaliana extract
Nucleotides

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