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Congenital limb and hand anomalies
Research Guide
What is Congenital limb and hand anomalies?
Congenital limb and hand anomalies are developmental malformations of the limbs and hands, such as polydactyly and syndactyly, arising from genetic heterogeneity, mutations in genes like CBP and EP300, and disruptions in Shh regulatory elements during embryogenesis.
Research on congenital limb and hand anomalies encompasses 29,789 works focused on genetic and developmental mechanisms underlying malformations like polydactyly and syndactyly. Studies highlight mutations in CBP and EP300 genes as causes of Rubinstein-Taybi syndrome with limb defects, alongside Shh regulatory mutations linked to preaxial polydactyly. Investigations also cover upper extremity embryology, classification systems, and epidemiology of these anomalies.
Topic Hierarchy
Research Sub-Topics
Sonic Hedgehog Signaling in Limb Patterning
This sub-topic elucidates Shh expression in zone of polarizing activity and its role in anterior-posterior digit patterning via Gli transcription factors. Researchers study gradient formation and Ptch1 feedback.
Genetic Basis of Polydactyly
This sub-topic identifies mutations in GLI3, ZRS enhancers, and HOXD13 associated with preaxial and postaxial polydactyly forms. Researchers perform linkage analysis and functional assays on regulatory variants.
Syndactyly Molecular Pathogenesis
This sub-topic investigates HOXD, FGF, and BMP signaling defects causing failure of interdigital apoptosis in syndactyly. Researchers model variants in mice and analyze human pedigrees.
Rubinstein-Taybi Syndrome Limb Phenotypes
This sub-topic characterizes broad thumbs/toes from CBP/EP300 mutations affecting histone acetylation and limb gene expression. Researchers correlate genotype-phenotype and epigenetic mechanisms.
Classification Systems for Congenital Limb Anomalies
This sub-topic refines Oberg-Manske-Tonkin and IFSSH classifications integrating molecular etiology with morphology. Researchers validate systems for prognosis and surgical planning via multicenter studies.
Why It Matters
Congenital limb and hand anomalies affect upper extremity development, with genetic studies identifying specific mutations that inform diagnosis and potential interventions. Lettice et al. (2003) demonstrated that a long-range Shh enhancer regulates limb expression and associates with preaxial polydactyly, enabling identification of regulatory mutations in affected individuals. Petrif et al. (1995) showed CBP mutations cause Rubinstein-Taybi syndrome, which includes limb anomalies, linking transcriptional co-activators to malformation etiology. These findings support targeted genetic screening in clinical settings for polydactyly and syndactyly cases, as evidenced by Shh's role in limb patterning from Riddle et al. (1993).
Reading Guide
Where to Start
"Sonic hedgehog mediates the polarizing activity of the ZPA" by Riddle et al. (1993), as it provides the foundational mechanism of Shh signaling in limb patterning, essential for understanding anomalies like polydactyly.
Key Papers Explained
Riddle et al. (1993) in "Sonic hedgehog mediates the polarizing activity of the ZPA" establishes Shh as the key signal for limb anterior-posterior polarity. Lettice et al. (2003) in "A long-range Shh enhancer regulates expression in the developing limb and fin and is associated with preaxial polydactyly" builds on this by identifying a distal enhancer whose mutations cause ectopic Shh expression and polydactyly. Petrif et al. (1995) in "Rubinstein-Taybi syndrome caused by mutations in the transcriptional co-activator CBP" connects transcriptional regulation via CBP to limb defects, intersecting with Shh pathways.
Paper Timeline
Most-cited paper highlighted in red. Papers ordered chronologically.
Advanced Directions
Current frontiers involve dissecting genetic heterogeneity in CBP/EP300 and Shh regulatory mutations for syndactyly and polydactyly classification, based on the 29,789 works emphasizing embryology and epidemiology. No recent preprints available, so focus remains on integrating patched homolog findings from Hahn et al. (1996) and Johnson et al. (1996) with developmental signaling.
Papers at a Glance
| # | Paper | Year | Venue | Citations | Open Access |
|---|---|---|---|---|---|
| 1 | CLINICAL ASSESSMENT OF BODY HAIR GROWTH IN WOMEN | 1961 | The Journal of Clinica... | 2.5K | ✕ |
| 2 | Sonic hedgehog mediates the polarizing activity of the ZPA | 1993 | Cell | 2.3K | ✕ |
| 3 | Radiographic Atlas of Skeletal Development of the Hand and Wrist | 1960 | Southern Medical Journal | 2.0K | ✕ |
| 4 | Mutations of the Human Homolog of Drosophila patched in the Ne... | 1996 | Cell | 2.0K | ✓ |
| 5 | Human Homolog of <b> <i>patched</i> </b> , a Candidate Gene fo... | 1996 | Science | 1.9K | ✕ |
| 6 | Regulation of the Hedgehog and Wingless signalling pathways by... | 1998 | Nature | 1.7K | ✕ |
| 7 | HedgehogandBmpGenes Are Coexpressed at Many Diverse Sites of C... | 1995 | Developmental Biology | 1.4K | ✕ |
| 8 | Rubinstein-Taybi syndrome caused by mutations in the transcrip... | 1995 | Nature | 1.2K | ✕ |
| 9 | A long-range Shh enhancer regulates expression in the developi... | 2003 | Human Molecular Genetics | 1.2K | ✓ |
| 10 | Dorsal differentiation of neural plate cells induced by BMP-me... | 1995 | Cell | 1.1K | ✓ |
Frequently Asked Questions
What role does Sonic hedgehog play in limb development?
Sonic hedgehog mediates polarizing activity from the zone of polarizing activity in limb buds, as shown by Riddle et al. (1993) in "Sonic hedgehog mediates the polarizing activity of the ZPA". This signaling establishes anterior-posterior patterning essential for proper digit formation. Disruptions lead to anomalies like polydactyly.
How do CBP mutations relate to congenital limb anomalies?
Mutations in the transcriptional co-activator CBP cause Rubinstein-Taybi syndrome, which features limb anomalies, according to Petrif et al. (1995) in "Rubinstein-Taybi syndrome caused by mutations in the transcriptional co-activator CBP". These mutations disrupt developmental gene regulation. The study identified affected patients with characteristic hand malformations.
What is the association between Shh enhancers and polydactyly?
A long-range Shh enhancer regulates expression in developing limbs and associates with preaxial polydactyly, per Lettice et al. (2003) in "A long-range Shh enhancer regulates expression in the developing limb and fin and is associated with preaxial polydactyly". Mutations in this enhancer cause ectopic Shh expression leading to extra digits. This explains some cases of non-coding regulatory disruptions.
What classification systems exist for hand anomalies?
Classification systems for congenital hand anomalies derive from embryological and epidemiological studies, including radiographic assessments like those in "Radiographic Atlas of Skeletal Development of the Hand and Wrist" (1960). These systems categorize malformations such as syndactyly and polydactyly based on developmental origins. They aid clinical diagnosis and surgical planning.
How does genetic heterogeneity contribute to limb malformations?
Genetic heterogeneity in limb malformations involves diverse mutations, including those in Shh regulators and CBP/EP300 genes, as explored in cluster studies. Papers like Lettice et al. (2003) highlight non-coding Shh enhancer variants causing polydactyly. This variability underscores the need for comprehensive genetic testing.
Open Research Questions
- ? How do long-range enhancers like the Shh limb enhancer interact with transcription factors to prevent polydactyly?
- ? What are the precise downstream targets of CBP and EP300 in upper extremity patterning?
- ? How do combinatorial disruptions in Shh and BMP signaling lead to syndactyly?
- ? What epidemiological factors modulate penetrance of patched homolog mutations in limb anomalies?
- ? How does Slimb-mediated regulation of Hedgehog signaling influence digit number in mammalian limbs?
Recent Trends
The field of congenital limb and hand anomalies maintains steady research with 29,789 works, centered on Shh regulatory elements and CBP mutations without specified 5-year growth data.
Emphasis persists on polydactyly via Lettice et al. and Rubinstein-Taybi limb defects from Petrif et al. (1995).
2003No recent preprints or news coverage indicate stable focus on genetic and embryological mechanisms.
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