Novel and nodulation-regulated microRNAs in soybean roots.

BMC Genomics
Senthil SubramanianOliver Yu

Abstract

Small RNAs regulate a number of developmental processes in plants and animals. However, the role of small RNAs in legume-rhizobial symbiosis is largely unexplored. Symbiosis between legumes (e.g. soybean) and rhizobia bacteria (e.g. Bradyrhizobium japonicum) results in root nodules where the majority of biological nitrogen fixation occurs. We sought to identify microRNAs (miRNAs) regulated during soybean-B. japonicum symbiosis. We sequenced approximately 350000 small RNAs from soybean roots inoculated with B. japonicum and identified conserved miRNAs based on similarity to miRNAs known in other plant species and new miRNAs based on potential hairpin-forming precursors within soybean EST and shotgun genomic sequences. These bioinformatics analyses identified 55 families of miRNAs of which 35 were novel. A subset of these miRNAs were validated by Northern analysis and miRNAs differentially responding to B. japonicum inoculation were identified. We also identified putative target genes of the identified miRNAs and verified in vivo cleavage of a subset of these targets by 5'-RACE analysis. Using conserved miRNAs as internal control, we estimated that our analysis identified approximately 50% of miRNAs in soybean roots. Construction...Continue Reading

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Methods Mentioned

BETA
454 sequencing
PCR

Software Mentioned

Seqclean
MegaBLAST
MFOLD
BLASTN
454 Life sciences
CAP3
miRU
WU
BLAST
miRbase

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