sRNA

sRNA analyzes high-throughput, size-separated small RNA (sRNA) sequencing data from Arabidopsis leaf and flower crude extracts to characterize cytosolic mature microRNA (miRNA) pools and investigate AGO1 loading dynamics.

Key Features:

• Data Processing: Downloads sRNA-seq reads from the Sequence Read Archive (SRA) and processes size-separated sRNA pools to identify patterns and associations between sRNAs and Argonaute (AGO) proteins.
• RISC Association Analysis: Compares size-separated pools to distinguish high molecular weight (HMW) RISCs associated with AGO1 from low molecular weight (LMW) RISCs linked to AGO4.
• Identification of Regulatory Checkpoints: Identifies cytoplasmic sRNAs, including protein-unbound mature miRNAs, to reveal regulatory checkpoints and differences in miRNA loading efficiencies, suggesting AGO protein availability as a limiting factor.
• Validation Support: Enables comparison of RISC-loaded and protein-unbound miRNA pools to support experimental validation of altered miRNA loading using transient and transgenic systems.

Scientific Applications:

• RNAi Mechanism Analysis: Characterize RNA interference (RNAi) mechanisms in plants by defining how miRNAs are sorted into biologically active RISCs.
• Regulatory Mechanisms: Investigate regulatory steps and checkpoints involved in miRNA loading onto AGO proteins.
• AGO Protein Dynamics: Study the role of AGO1 and AGO4 availability and their association with HMW and LMW RISC complexes in determining miRNA loading efficiency.
• miRNA Functionality: Examine how processing and sorting of different miRNAs affect their biological activity in Arabidopsis leaf and flower cells.
• Experimental Validation: Support validation of miRNA loading hypotheses through comparison of sequencing-derived RISC-loaded and protein-unbound pools in transient and transgenic systems.

Methodology:

Runs on a Linux system with a zsh shell by executing the sRNA_analysis.sh script, which automates download of sRNA-seq reads from the SRA, processes size-separated sRNA pools, and writes results to the 'sRNA-seq' directory.