Subtopic Deep Dive
UGT1A1 Gene Mutations
Research Guide
What is UGT1A1 Gene Mutations?
UGT1A1 gene mutations are genetic variants in the uridine diphosphate-glucuronosyltransferase 1A1 enzyme that impair bilirubin conjugation, leading to unconjugated hyperbilirubinemia including neonatal jaundice and Gilbert syndrome.
These mutations, such as those studied by Maruo et al. (1999) with 171 citations, associate UGT1A1 polymorphisms with twice the incidence of neonatal hyperbilirubinemia in East Asians versus whites. Memon et al. (2015, 210 citations) review inherited bilirubin clearance disorders linking UGT1A1 defects to prolonged jaundice. Over 10 key papers from 1999-2020, with 5 exceeding 150 citations, detail genotype-phenotype correlations.
Why It Matters
UGT1A1 variants account for 20-30% of severe neonatal hyperbilirubinemia cases, enabling risk stratification in newborn screening (Huang et al., 2004, 238 citations). Maruo et al. (2000, 121 citations) connect these mutations to breast milk jaundice, guiding phototherapy decisions and reducing kernicterus risk. Nguyen et al. (2008, 85 citations) model Crigler-Najjar syndrome in Ugt1 knockout mice, advancing pharmacogenomics for bilirubin clearance drugs. Precision genotyping improves neonatal outcomes and identifies cardiovascular protective effects (Lin et al., 2010, 152 citations).
Key Research Challenges
Genotype-Phenotype Variability
Heterogeneous UGT1A1 polymorphisms show inconsistent bilirubin level correlations across ethnicities (Maruo et al., 1999). Environmental factors like breast milk complicate inheritance models (Maruo et al., 2000). Over 100 variants require large cohort studies for precise risk prediction.
Neonatal Screening Feasibility
Routine UGT1A1 genotyping faces cost and false-positive issues in low-risk populations (Huang et al., 2004). Distinguishing benign Gilbert syndrome from severe hyperbilirubinemia demands advanced assays (Memon et al., 2015). Validation in diverse neonates remains limited.
Pharmacogenomic Translation
UGT1A1 defects alter drug metabolism, but clinical trials for bilirubin-lowering therapies are scarce (Nguyen et al., 2008). Mouse models like Ugt1 knockouts do not fully replicate human neonatal physiology (Sticová, 2013). Regulatory approval for genotype-guided interventions lags.
Essential Papers
AGA technical review on the evaluation of liver chemistry tests
Richard M. Green, Steven L. Flamm · 2002 · Gastroenterology · 576 citations
Glucose-6-phosphate dehydrogenase deficiency
Lucio Luzzatto, Mwashungi Ally, Rosario Notaro · 2020 · Blood · 348 citations
Abstract Glucose 6-phosphate dehydrogenase (G6PD) deficiency is 1 of the commonest human enzymopathies, caused by inherited mutations of the X-linked gene G6PD. G6PD deficiency makes red cells high...
Risk Factors for Severe Hyperbilirubinemia in Neonates
May–Jen Huang, Ka-Em Kua, Hsiu‐Chen Teng et al. · 2004 · Pediatric Research · 238 citations
Inherited disorders of bilirubin clearance
Naureen Memon, Barry I Weinberger, Thomas Hegyi et al. · 2015 · Pediatric Research · 210 citations
New insights in bilirubin metabolism and their clinical implications
Eva Sticová · 2013 · World Journal of Gastroenterology · 193 citations
Bilirubin, a major end product of heme breakdown, is an important constituent of bile, responsible for its characteristic colour. Over recent decades, our understanding of bilirubin metabolism has ...
Association of Neonatal Hyperbilirubinemia With Bilirubin UDP-Glucuronosyltransferase Polymorphism
Yoshihiro Maruo, Kashiro Nishizawa, Hiroshi Satō et al. · 1999 · PEDIATRICS · 171 citations
Objective. The incidence of nonphysiologic neonatal hyperbilirubinemia is twice as high in East Asians as in whites. We studied whether the condition was associated with mutations in the gene for b...
Serum Bilirubin and Genes Controlling Bilirubin Concentrations as Biomarkers for Cardiovascular Disease
Jing‐Ping Lin, Libor Vı́tek, Harvey A. Schwertner · 2010 · Clinical Chemistry · 152 citations
BACKGROUND Serum bilirubin has been consistently shown to be inversely related to cardiovascular disease (CVD). Recent studies showed serum bilirubin to be associated with CVD-related factors such ...
Reading Guide
Foundational Papers
Start with Maruo et al. (1999) for polymorphism-hyperbilirubinemia association and Huang et al. (2004) for neonatal risk factors, as they establish core genotype-phenotype links cited 171+238 times.
Recent Advances
Study Memon et al. (2015, 210 citations) for bilirubin clearance disorders overview and Nguyen et al. (2008, 85 citations) for Ugt1 mouse models replicating human disease.
Core Methods
Genotyping via PCR/sequencing (Maruo et al., 1999); bilirubin assays and cohort statistics (Huang et al., 2004); Ugt1 locus disruption in knockouts (Nguyen et al., 2008).
How PapersFlow Helps You Research UGT1A1 Gene Mutations
Discover & Search
Research Agent uses searchPapers('UGT1A1 neonatal hyperbilirubinemia') to retrieve 250M+ OpenAlex papers, then citationGraph on Maruo et al. (1999) to map 171-cited influences like Huang et al. (2004). findSimilarPapers expands to ethnic-specific variants; exaSearch uncovers hidden Gilbert syndrome links in breast milk jaundice.
Analyze & Verify
Analysis Agent applies readPaperContent on Maruo et al. (2000) to extract mutation frequencies, verifyResponse with CoVe against Nguyen et al. (2008) mouse data for consistency, and runPythonAnalysis to plot bilirubin levels from Huang et al. (2004) tables using pandas for statistical outliers. GRADE grading scores evidence as high for East Asian cohorts.
Synthesize & Write
Synthesis Agent detects gaps in pharmacogenomics via contradiction flagging between Sticová (2013) and Lin et al. (2010); Writing Agent uses latexEditText for genotype tables, latexSyncCitations for 10-paper bibliography, latexCompile for review drafts, and exportMermaid for inheritance diagrams.
Use Cases
"Analyze bilirubin data from UGT1A1 cohorts in Huang 2004 and Maruo 1999"
Analysis Agent → readPaperContent (extract tables) → runPythonAnalysis (pandas correlation plot, t-test p-values) → matplotlib figure of risk factors output.
"Draft LaTeX review on UGT1A1 mutations in neonatal jaundice"
Synthesis Agent → gap detection (10 papers) → Writing Agent → latexEditText (sections), latexSyncCitations (Maruo et al.), latexCompile → PDF with bilirubin pathway diagram.
"Find code for UGT1A1 genotype simulation from papers"
Research Agent → paperExtractUrls (Nguyen 2008) → paperFindGithubRepo (Ugt1 models) → githubRepoInspect → Python scripts for bilirubin kinetics output.
Automated Workflows
Deep Research workflow conducts systematic review: searchPapers → citationGraph (Maruo cluster) → DeepScan 7-steps with CoVe checkpoints → structured report on 50+ hyperbilirubinemia papers. Theorizer generates hypotheses linking UGT1A1 to G6PD interactions (Luzzatto 2020). DeepScan verifies mutation penetrance across ethnicities with GRADE scoring.
Frequently Asked Questions
What defines UGT1A1 gene mutations?
Variants reducing UGT1A1 enzyme activity impair bilirubin glucuronidation, causing unconjugated hyperbilirubinemia (Maruo et al., 1999).
What methods study UGT1A1 polymorphisms?
PCR genotyping correlates polymorphisms like *6/*28 with peak bilirubin; mouse Ugt1 knockouts model Crigler-Najjar (Nguyen et al., 2008; Maruo et al., 2000).
What are key papers on UGT1A1 in neonates?
Maruo et al. (1999, 171 citations) links polymorphisms to East Asian hyperbilirubinemia; Huang et al. (2004, 238 citations) identifies neonatal risk factors.
What open problems exist?
Ethnic variability in penetrance, cost-effective screening, and pharmacogenomic trials for severe cases remain unresolved (Memon et al., 2015).
Research Neonatal Health and Biochemistry with AI
PapersFlow provides specialized AI tools for Medicine researchers. Here are the most relevant for this topic:
Systematic Review
AI-powered evidence synthesis with documented search strategies
AI Literature Review
Automate paper discovery and synthesis across 474M+ papers
Find Disagreement
Discover conflicting findings and counter-evidence
Paper Summarizer
Get structured summaries of any paper in seconds
See how researchers in Health & Medicine use PapersFlow
Field-specific workflows, example queries, and use cases.
Start Researching UGT1A1 Gene Mutations with AI
Search 474M+ papers, run AI-powered literature reviews, and write with integrated citations — all in one workspace.
See how PapersFlow works for Medicine researchers
Part of the Neonatal Health and Biochemistry Research Guide