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name: 'cellfree-rna-agent' description: 'AI-powered cell-free RNA analysis from liquid biopsy for cancer detection, tissue-of-origin identification, and non-invasive transcriptomic profiling.' measurable_outcome: Execute skill workflow successfully with valid output within 15 minutes. allowed-tools:

• read_file
• run_shell_command

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Cell-Free RNA Analysis Agent

The Cell-Free RNA Analysis Agent provides comprehensive analysis of circulating cell-free RNA (cfRNA) from plasma and other biofluids for cancer detection, tissue-of-origin identification, and non-invasive transcriptomic profiling.

When to Use This Skill

• When analyzing plasma cfRNA for cancer detection and monitoring.
• To identify tissue-of-origin from circulating transcripts.
• For non-invasive transcriptomic profiling of tumors.
• When integrating cfRNA with cfDNA for comprehensive liquid biopsy.
• To discover RNA-based biomarkers from accessible biofluids.

Core Capabilities

1. cfRNA Profiling: Quantify mRNA, lncRNA, and small RNA from plasma.

2. Tissue Deconvolution: Identify tissue sources contributing to cfRNA pool.

3. Cancer Detection: ML models detecting cancer from cfRNA profiles.

4. Tumor Transcriptomics: Infer tumor gene expression non-invasively.

5. Integration with cfDNA: Combine RNA and DNA liquid biopsy analytes.

6. Biomarker Discovery: Identify diagnostic and prognostic RNA markers.

cfRNA Biology

Sources:

• Cell death (apoptosis, necrosis)
• Active secretion (EVs, RNA-binding proteins)
• Cell surface-associated RNA

Protection Mechanisms:

• Extracellular vesicles
• Protein complexes (AGO2, NPM1)
• Lipoproteins

Half-life: Minutes to hours (shorter than cfDNA)

Workflow

1. Input: Plasma cfRNA sequencing data (total RNA, small RNA, or targeted).

2. Quality Control: Assess library complexity, mapping rates, contamination.

3. Quantification: Normalize and quantify transcripts.

4. Deconvolution: Estimate tissue contributions.

5. Classification: Apply cancer detection models.

6. Integration: Combine with cfDNA if available.

7. Output: Tissue composition, cancer score, biomarker profiles.

Example Usage

User: "Analyze plasma cfRNA to detect cancer and identify tissue of origin."

Agent Action:

python3 Skills/Genomics/CellFree_RNA_Agent/cfrna_analyzer.py \
    --input plasma_cfrna.fastq.gz \
    --protocol total_rna \
    --reference gencode_v44 \
    --deconvolution true \
    --cancer_detection true \
    --output cfrna_results/

Tissue Deconvolution

Reference Transcriptomes:

• GTEx tissue expression atlas
• Single-cell reference atlases
• Tissue-specific marker genes

Methods:

• Non-negative least squares
• Support vector regression
• Deep learning deconvolution

Clinical Applications:

• Organ injury detection (liver, heart, brain)
• Tumor burden estimation
• Post-transplant monitoring

Cancer Detection Applications

Cancer Type	Key Markers	Performance
Lung	XIST, MALAT1, specific mRNAs	AUC 0.80-0.90
Breast	HER2, ER/PR transcripts	Monitoring
Colorectal	KRAS, panel genes	Early detection
Prostate	PCA3, TMPRSS2-ERG	Established
Liver	AFP, specific ncRNAs	HCC surveillance

Technical Considerations

Pre-analytical Factors:

• Sample collection (EDTA, cell stabilization)
• Processing time (<4 hours recommended)
• Storage temperature (-80°C)
• Hemolysis avoidance (critical)

Library Preparation:

• Total RNA (captures mRNA, lncRNA)
• Small RNA (miRNA, piRNA)
• Targeted panels (specific genes)
• UMI-based for quantification

AI/ML Components

Cancer Classifier:

• Gradient boosting on gene panels
• Neural networks for full transcriptome
• Multi-cancer detection models

Tissue Predictor:

• Reference-based deconvolution
• Supervised tissue classifiers
• Anomaly detection for novel sources

Integration with Other Analytes

Analyte	Strength	Combination Benefit
cfDNA	Mutations, methylation	Genomic + transcriptomic
CTCs	Single-cell analysis	Cellular confirmation
Exosomes	Protected RNA	Source identification
Proteins	Functional markers	Multi-modal biomarkers

Prerequisites

• Python 3.10+
• STAR/Salmon for alignment
• DESeq2/edgeR for quantification
• Tissue deconvolution tools

Related Skills

• Liquid_Biopsy_Analytics_Agent - For comprehensive liquid biopsy
• Exosome_EV_Analysis_Agent - For EV-derived RNA
• ctDNA_Analysis - For DNA-based markers

Emerging Technologies

1. Targeted cfRNA: Gene panels for specific cancers
2. Single-molecule: Direct RNA sequencing
3. Spatial deconvolution: Mapping cfRNA to tissue regions
4. Longitudinal monitoring: Treatment response tracking

Author

AI Group - Biomedical AI Platform

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