Subtopic Deep Dive

Rubinstein-Taybi Syndrome Limb Phenotypes
Research Guide

What is Rubinstein-Taybi Syndrome Limb Phenotypes?

Rubinstein-Taybi Syndrome (RTS) limb phenotypes feature broad thumbs and halluces due to CBP/EP300 mutations disrupting histone acetylation and limb gene expression.

RTS affects 1/100,000-125,000 births with distal limb anomalies including brachydactyly and polydactyly alongside intellectual disability and facial dysmorphism (Van-Gils et al., 2021, 82 citations). Mutations in CREBBP or EP300 genes impair chromatin remodeling critical for skeletal development (Lacombe et al., 2024, 33 citations). Over 50 papers document genotype-phenotype correlations in RTS limb defects.

Curated Papers

Key Challenges

Why It Matters

RTS limb phenotypes reveal chromatin remodelers' roles in limb bud patterning, informing epigenetic therapies for congenital anomalies (Van-Gils et al., 2021). Clinical consensus guides management of broad thumbs, polydactyly, and associated skeletal issues like scoliosis (Lacombe et al., 2024). Yu et al. (2019) identified high polydactyly frequency in CREBBP variants among 18 Chinese RTS cases, highlighting ethnic-specific phenotypes for precision diagnostics. Temtamy and Aglan (2008) classify brachydactyly types in RTS, aiding surgical planning.

Key Research Challenges

Genotype-Phenotype Correlation

Mapping specific CREBBP/EP300 variants to variable limb phenotypes like polydactyly remains inconsistent across cohorts. Yu et al. (2019) found novel variants in 18 Chinese RTS kids with high polydactyly, but broader validation is needed. Di Fede et al. (2020) noted phenotype overlap with Wiedemann-Steiner syndrome.

Epigenetic Mechanism Elucidation

Disrupted histone acetylation's precise impact on limb gene expression requires functional models. Van-Gils et al. (2021) model RTS as an epigenetic disorder but lack limb-specific assays. Dai et al. (2002) link Gli3 regulation to limb patterning, relevant to RTS pathways.

Surgical Management Variability

Optimal timing and techniques for correcting broad thumbs or polydactyly in RTS face challenges from growth anomalies. Lacombe et al. (2024) provide first consensus but note limited evidence. Bounakis et al. (2015) report scoliosis surgery in RTS type 2.

Essential Papers

Brachydactyly

Samia A. Temtamy, Mona Aglan · 2008 · Orphanet Journal of Rare Diseases · 148 citations

Ski is involved in transcriptional regulation by the repressor and full-length forms of Gli3

Ping Dai, Toshie Shinagawa, Teruaki Nomura et al. · 2002 · Genes & Development · 85 citations

Transcription factor Glioblastoma-3 (Gli3) is cleaved in the anterior region of the limb bud to generate its repressor form. In contrast, Sonic hedgehog ( Shh ) signaling from the posterior zone of...

Rubinstein-Taybi Syndrome: A Model of Epigenetic Disorder

Julien Van‐Gils, Frédérique Magdinier, Patricia Fergelot et al. · 2021 · Genes · 82 citations

The Rubinstein-Taybi syndrome (RSTS) is a rare congenital developmental disorder characterized by a typical facial dysmorphism, distal limb abnormalities, intellectual disability, and many addition...

Diagnosis and management in Rubinstein-Taybi syndrome: first international consensus statement

Didier Lacombe, Agnès Bloch‐Zupan, Cecilie Bredrup et al. · 2024 · Journal of Medical Genetics · 33 citations

Rubinstein-Taybi syndrome (RTS) is an archetypical genetic syndrome that is characterised by intellectual disability, well-defined facial features, distal limb anomalies and atypical growth, among ...

Forefoot malformations, deformities and other congenital defects in children

Virginie Rampal, Fabienne Giuliano · 2019 · Orthopaedics & Traumatology Surgery & Research · 30 citations

Expanding the phenotype associated to KMT2A variants: overlapping clinical signs between Wiedemann–Steiner and Rubinstein–Taybi syndromes

Elisabetta Di Fede, Valentina Massa, Bartolomeo Augello et al. · 2020 · European Journal of Human Genetics · 22 citations

Clinical exome sequencing identifies novel <i>CREBBP</i> variants in 18 Chinese Rubinstein–Taybi Syndrome kids with high frequency of polydactyly

Sha Yu, Bingbing Wu, Yanyan Qian et al. · 2019 · Molecular Genetics & Genomic Medicine · 15 citations

Abstract Background Rubinstein–Taybi syndrome (RSTS) is a rare genetic disease characterized by broad thumbs and halluces, facial dysmorphisms, short stature, and intellectual disability. RSTS is m...

Reading Guide

Foundational Papers

Start with Temtamy and Aglan (2008, 148 citations) for brachydactyly classification in congenital anomalies including RTS. Follow with Dai et al. (2002, 85 citations) on Gli3 in limb patterning relevant to RTS epigenetics. Al Kaissi et al. (2014) details skeletal deformities.

Recent Advances

Lacombe et al. (2024, 33 citations) for management consensus. Van-Gils et al. (2021, 82 citations) as epigenetic model. Yu et al. (2019, 15 citations) for CREBBP variants and polydactyly.

Core Methods

Exome sequencing for variants (Yu et al., 2019). Consensus clinical evaluation (Lacombe et al., 2024). Gli3 transcriptional assays (Dai et al., 2002). Radiographic phenotyping (Al Kaissi et al., 2014).

How PapersFlow Helps You Research Rubinstein-Taybi Syndrome Limb Phenotypes

Discover & Search

PapersFlow's Research Agent uses searchPapers and exaSearch to query 'Rubinstein-Taybi CREBBP limb polydactyly,' surfacing Yu et al. (2019) with 15 citations on novel variants. citationGraph traces Temtamy and Aglan (2008, 148 citations) as foundational for brachydactyly in RTS. findSimilarPapers expands to Di Fede et al. (2020) for phenotype overlaps.

Analyze & Verify

Analysis Agent employs readPaperContent on Lacombe et al. (2024) to extract consensus on limb anomalies, then verifyResponse with CoVe checks claims against Van-Gils et al. (2021). runPythonAnalysis processes genotype data from Yu et al. (2019) via pandas for variant frequency stats, graded by GRADE for evidence strength in polydactyly correlations.

Synthesize & Write

Synthesis Agent detects gaps in epigenetic limb models between Dai et al. (2002) and recent RTS papers, flagging contradictions in Gli3 roles. Writing Agent uses latexEditText and latexSyncCitations to draft phenotype reviews citing 10+ papers, with latexCompile for publication-ready PDFs and exportMermaid for limb development pathway diagrams.

Use Cases

"Analyze polydactyly frequency in RTS CREBBP variants from Chinese cohort."

Research Agent → searchPapers('RTS CREBBP polydactyly') → Analysis Agent → readPaperContent(Yu et al. 2019) → runPythonAnalysis(pandas count variants) → researcher gets CSV of variant-phenotype stats.

"Draft LaTeX review of RTS limb management consensus."

Research Agent → citationGraph(Lacombe et al. 2024) → Synthesis Agent → gap detection → Writing Agent → latexEditText + latexSyncCitations(20 papers) + latexCompile → researcher gets compiled PDF with citations.

"Find code for epigenetic analysis in RTS limb models."

Research Agent → paperExtractUrls(Dai et al. 2002) → Code Discovery → paperFindGithubRepo → githubRepoInspect → researcher gets runnable Gli3 simulation scripts.

Automated Workflows

Deep Research workflow scans 50+ RTS papers via searchPapers, structures reports on limb phenotypes with GRADE grading, chaining to citationGraph for Temtamy (2008). DeepScan's 7-steps verify Yu et al. (2019) variant calls with CoVe and runPythonAnalysis. Theorizer generates hypotheses on EP300-Gli3 interactions from Dai et al. (2002) and Van-Gils (2021).

Try Doxa for Rubinstein-Taybi Syndrome Limb Phenotypes Research

Frequently Asked Questions

What defines RTS limb phenotypes?

Broad thumbs and halluces, brachydactyly, and polydactyly from CREBBP/EP300 mutations (Lacombe et al., 2024). Temtamy and Aglan (2008) classify associated brachydactyly types.

What methods study RTS limb defects?

Clinical exome sequencing identifies variants (Yu et al., 2019). Epigenetic modeling assesses histone acetylation impacts (Van-Gils et al., 2021). Radiography evaluates skeletal deformities (Al Kaissi et al., 2014).

What are key papers on RTS limbs?

Lacombe et al. (2024, 33 citations) on consensus management. Yu et al. (2019, 15 citations) on CREBBP polydactyly. Temtamy and Aglan (2008, 148 citations) on brachydactyly.

What open problems exist in RTS limb research?

Ethnic variability in phenotypes needs larger cohorts (Yu et al., 2019). Functional assays for variant effects on limb genes are lacking (Van-Gils et al., 2021). Standardized surgical protocols require long-term outcomes (Lacombe et al., 2024).