Subtopic Deep Dive
Aristolochic Acid Mutational Signature
Research Guide
What is Aristolochic Acid Mutational Signature?
The Aristolochic Acid Mutational Signature is the A:T→T:A transversion pattern in urothelial carcinoma genomes caused by aristolochic acid exposure from Aristolochia plants.
Whole-genome sequencing detects this signature in tumors from patients exposed to Chinese herbs like Aristolochia fangchi. Nortier et al. (2000) linked it to high urothelial carcinoma prevalence in Chinese-herb nephropathy patients (967 citations). Nik-Zainal et al. (2015) showed genomes record such environmental exposures via distinct mutation patterns (221 citations).
Why It Matters
This signature traces aristolochic acid as a carcinogen in global urothelial cancers, enabling retrospective exposure identification. Nortier et al. (2000) reported 40-60% urothelial carcinoma rates in exposed nephropathy patients. Jadot et al. (2017) updated AAN mechanisms linking nephrotoxicity to upper tract urothelial carcinoma. Han et al. (2019) detailed AA-induced DNA adduction causing the signature, informing herbal medicine bans worldwide (152 citations). Stiborová et al. (2016) connected it to Balkan endemic nephropathy etiology (128 citations).
Key Research Challenges
Detecting Low-Frequency Signatures
Distinguishing AA signature from background mutations requires high-depth sequencing in heterogeneous tumors. Nik-Zainal et al. (2015) highlight experimental validation needs for low-exposure cases. Scélo et al. (2014) found variable genomic landscapes across Europe complicating detection (196 citations).
Linking Signature to Exposure
Correlating mutational burden with historical herbal use demands epidemiological data. Nortier et al. (2000) tied it to specific Aristolochia fangchi but population variations persist. Gifford et al. (2016) note challenges in endemic nephropathy aetiology worldwide (171 citations).
Mechanistic Validation Models
In vitro and animal models inadequately replicate human AA signature fidelity. Han et al. (2019) review AA-DNA adduction but call for better transporters like SLC22 studies. Wang and Sweet (2012) detail renal anion transporters' role in AA uptake (145 citations).
Essential Papers
Urothelial Carcinoma Associated with the Use of a Chinese Herb (<i>Aristolochia fangchi</i>)
Joëlle Nortier, Marie-Carmen Muniz Martinez, Heinz H. Schmeiser et al. · 2000 · New England Journal of Medicine · 967 citations
The prevalence of urothelial carcinoma among patients with end-stage Chinese-herb nephropathy (caused by aristolochia species) is a high.
The genome as a record of environmental exposure
Serena Nik‐Zainal, Jill E. Kucab, Sandro Morganella et al. · 2015 · Mutagenesis · 221 citations
Whole genome sequencing of human tumours has revealed distinct patterns of mutation that hint at the causative origins of cancer. Experimental investigations of the mutations and mutation spectra i...
An Integrated View of Aristolochic Acid Nephropathy: Update of the Literature
Inès Jadot, Anne‐Émilie Declèves, Joëlle Nortier et al. · 2017 · International Journal of Molecular Sciences · 206 citations
The term “aristolochic acid nephropathy” (AAN) is used to include any form of toxic interstitial nephropathy that is caused either by ingestion of plants containing aristolochic acids (AA) as part ...
Variation in genomic landscape of clear cell renal cell carcinoma across Europe
Ghislaine Scélo, Yasser Riazalhosseini, Liliana Greger et al. · 2014 · Nature Communications · 196 citations
Endemic Nephropathy Around the World
Fiona J Gifford, Robert M. Gifford, Michael Eddleston et al. · 2016 · Kidney International Reports · 171 citations
The Safety and Regulation of Natural Products Used as Foods and Food Ingredients
Ali H. Abdelrahman, Njwen Anyangwe, Louis Carlacci et al. · 2011 · Toxicological Sciences · 167 citations
The use of botanicals and dietary supplements derived from natural substances as an adjunct to an improved quality of life or for their purported medical benefits has become increasingly common in ...
Herbal medicines and chronic kidney disease
Vivekanand Jha · 2010 · Nephrology · 155 citations
ABSTRACT Alternative and indigenous systems of medicine are popular amongst the poorer sections of society in the developing world. Their use in the developed world has also increased in recent tim...
Reading Guide
Foundational Papers
Start with Nortier et al. (2000) for clinical evidence of urothelial carcinoma in AA-exposed patients (967 citations), then Scélo et al. (2014) for European genomic variations (196 citations).
Recent Advances
Study Nik-Zainal et al. (2015) for genome-as-exposure-record concept (221 citations), Jadot et al. (2017) AAN update (206 citations), and Han et al. (2019) mechanisms (152 citations).
Core Methods
Whole-genome sequencing for mutation spectra, bioinformatics for A:T→T:A quantification, renal transporter assays (Wang and Sweet, 2012), and epidemiological tracing (Gifford et al., 2016).
How PapersFlow Helps You Research Aristolochic Acid Mutational Signature
Discover & Search
Research Agent uses searchPapers('Aristolochic Acid mutational signature') to find Nortier et al. (2000), then citationGraph reveals 967 citing papers on urothelial carcinoma; exaSearch uncovers Balkan nephropathy links from Stiborová et al. (2016); findSimilarPapers expands to Nik-Zainal et al. (2015) for genome exposure records.
Analyze & Verify
Analysis Agent runs readPaperContent on Nortier et al. (2000) to extract signature prevalence data, verifies A:T→T:A claims via verifyResponse (CoVe) against Han et al. (2019), and uses runPythonAnalysis for statistical mutation spectrum comparison with NumPy/pandas; GRADE grading scores evidence strength for causal links.
Synthesize & Write
Synthesis Agent detects gaps in exposure tracing via contradiction flagging between Jadot et al. (2017) and endemic studies, then Writing Agent applies latexEditText for signature diagrams, latexSyncCitations for 10+ papers, and latexCompile for review manuscripts; exportMermaid visualizes mutation pathway graphs.
Use Cases
"Analyze mutation spectra from Aristolochic Acid papers with statistics."
Research Agent → searchPapers → Analysis Agent → runPythonAnalysis (pandas mutation counting, matplotlib spectra plots) → CSV export of A:T→T:A frequencies across Nortier (2000) and Nik-Zainal (2015) datasets.
"Write LaTeX review on AA signature in urothelial carcinoma."
Synthesis Agent → gap detection → Writing Agent → latexEditText (intro/methods), latexSyncCitations (Nortier 2000, Han 2019), latexCompile → PDF with embedded AA adduction figure.
"Find code for AA mutational signature extraction."
Research Agent → paperExtractUrls (Nik-Zainal 2015) → Code Discovery → paperFindGithubRepo → githubRepoInspect → Python script for transversion counting shared via exportCsv.
Automated Workflows
Deep Research workflow scans 50+ papers via searchPapers on 'aristolochic acid nephropathy signature', structures report with GRADE-scored sections on Nortier (2000) causality. DeepScan applies 7-step CoVe to verify Han et al. (2019) mechanisms against Stiborová (2016). Theorizer generates hypotheses linking Scélo et al. (2014) European variations to AA exposure models.
Frequently Asked Questions
What defines the Aristolochic Acid Mutational Signature?
It is the A:T→T:A transversion pattern from AA-DNA adduction in urothelial carcinoma genomes (Nik-Zainal et al., 2015).
What methods detect this signature?
Whole-genome sequencing analyzes mutation spectra; bioinformatics tools quantify transversions (Nortier et al., 2000; Han et al., 2019).
What are key papers on AA signature?
Nortier et al. (2000, 967 citations) links to Chinese-herb nephropathy; Nik-Zainal et al. (2015, 221 citations) on genome exposure records.
What open problems exist?
Low-exposure detection, population-specific variations, and improved mechanistic models remain unresolved (Scélo et al., 2014; Stiborová et al., 2016).
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