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Features include always present findings: Intellectual disability, Delayed speech and language development, Global developmental delay, and Speech apraxia; and very common findings: Frontal bossing. 44 total HPO annotations.
Organ System | Phenotype Count | Example Features |
|---|---|---|
Brain and nerves | 13 | Stuttering, Myoclonic seizure, Widened cerebral subarachnoid space |
CHD3 encodes chromodomain helicase DNA binding protein 3 (2,000 aa). ATP-dependent chromatin-remodeling factor that binds and distorts nucleosomal DNA. Acts as a component of the histone deacetylase NuRD complex which participates in the remodeling of chromatin. Highest expression in Cervix Ectocervix (180.9 TPM) and Cervix Endocervix (166.7 TPM).
Snijders Blok-Campeau syndrome is caused by mutations in the CHD3 gene on chromosome 17.
The CHD3 protein participates in ZBED1 (DREF) SUMOylates CHD3 with SUMO1, CHD and CDK2AP subunits are recruited to NuRD, and TRIM28 SUMOylates TRIM28:ZNF350 with SUMO1 pathways.
CHD3 is classified as a druggable target with score 0.0.
Genetic testing for CHD3 is available. Testing is considered confirmatory for diagnosis.
Biomarker and diagnostic research for Snijders Blok-Campeau syndrome has been reported in the published literature.
Phenotype severity distribution: 4 always present features, 1 very common feature, 8 common features.
Estimated prevalence: <1 in 1,000,000 (VERY_RARE).
No clinical trials have been registered for Snijders Blok-Campeau syndrome.
11 publications have been identified in PubMed for Snijders Blok-Campeau syndrome. Research spans Case Report / Case Series (36%), Basic Science / Preclinical (36%), and Epidemiology / Natural History (18%).
Research Type | Count | % of Total |
|---|---|---|
Patient case studies | 4 | 36% |
Data assembled from 7 of 12 sources · Last updated Sep 20, 2026, 5:52 AM UTC
Online Mendelian Inheritance in Man
European rare disease database
Genetic and Rare Diseases Info Center
Common questions about Snijders Blok-Campeau syndrome
Heart and blood vessels |
3 |
Widened cerebral subarachnoid space, Perimembranous ventricular septal defect, Atrial septal defect |
Eyes | 2 | Strabismus, Cerebral visual impairment |
Head and neck | 2 | High palate, Macrocephaly |
Bones and joints | 2 | Sideways curvature of the spine (scoliosis), Joint hypermobility |
Muscles | 1 | Low muscle tone (hypotonia) |
Arms and legs | 1 | Abnormal foot morphology |
Digestive system | 1 | Feeding difficulties |
Age of onset: newborn period.
Laboratory research
4 |
36% |
Disease patterns and progression | 2 | 18% |
Testing and diagnosis research | 1 | 9% |
Santini A (2026). [PMID: 41952182](https://pubmed.ncbi.nlm.nih.gov/41952182/). *Genome Med*. [Diagnostic / Biomarker]
Yang K (2026). [PMID: 41708849](https://pubmed.ncbi.nlm.nih.gov/41708849/). *Nature*. [Basic Science / Preclinical]
Ocay DD (2025). [PMID: 40881826](https://pubmed.ncbi.nlm.nih.gov/40881826/). *Front Pain Res (Lausanne)*. [Epidemiology / Natural History]
Paul L (2025). [PMID: 40710838](https://pubmed.ncbi.nlm.nih.gov/40710838/). *Reports (MDPI)*. [Case Report / Case Series]
Ionescu A (2025). [PMID: 40830229](https://pubmed.ncbi.nlm.nih.gov/40830229/). *Eur J Hum Genet*. [Epidemiology / Natural History]
Enomoto Y (2025). [PMID: 39988727](https://pubmed.ncbi.nlm.nih.gov/39988727/). *Eur J Hum Genet*. [Basic Science / Preclinical]
Mitchell ZH (2025). [PMID: 40835974](https://pubmed.ncbi.nlm.nih.gov/40835974/). *EMBO Rep*. [Basic Science / Preclinical]
Tie X (2025). [PMID: 39542866](https://pubmed.ncbi.nlm.nih.gov/39542866/). *Am J Med Genet A*. [Case Report / Case Series]
Chen L (2025). [PMID: 39709005](https://pubmed.ncbi.nlm.nih.gov/39709005/). *Eur J Med Genet*. [Case Report / Case Series]
Yalçın HY (2024). [PMID: 38841327](https://pubmed.ncbi.nlm.nih.gov/38841327/). *Mol Syndromol*. [Case Report / Case Series]
AI-curated news mentioning Snijders Blok-Campeau syndrome
Updated Jul 31, 2026
That research is boosted by the ... for therapies to be tested for the first time in humans through “investigator-initiated trials.” · These small-scale clinical trials generally undergo less oversight than the traditional approval pathway for a green light. Similar models exist in other countries and are seen as important to accelerating breakthroughs and administering life-saving treatments especially for rare diseases, where there ... That research is boosted by the country’s so-called dual-track regulatory system, experts say, which allows for therapies to be tested for the first time in humans through “investigator-initiated trials.” · These small-scale clinical trials generally undergo less oversight than the traditional approval pathway for a green light. Similar models exist in other countries and are seen as important to accelerating breakthroughs and administering life-saving treatments especially for rare diseases, where there is little commercial incentive for research. Even as results from related research were published in the Nature journal, the outcome was never made public by the doctors or their institutions. It was against this backdrop the Shanghai couple who shared their story with Science undertook a journey to get treatment for their young daughter. The girl had been diagnosed with a rare gene defect that produces a neurodevelopmental condition known as Snijders Blok-Campeau syndrome, Science reported. The disease can cause intellectual deficits as well as severe physical symptoms. While the girl showed symptoms that were milder than others, her parents decided to explore specialized gene therapy, according to Science. Qiu was known for research working with a cutting-edge technique known as base editing to make custom treatments for children with rare diseases. Under a treatment plan he developed for the family, the girl would be the first person in the world to receive a gene-editing therapy directed at the brain, according to Science.
That research is boosted by the ... for therapies to be tested for the first time in humans through “investigator-initiated trials.” · These small-scale clinical trials generally undergo less oversight than the traditional approval pathway for a green light. Similar models exist in other countries and are seen as important to accelerating breakthroughs and administering life-saving treatments especially for rare diseases, where there ... That research is boosted by the country’s so-called dual-track regulatory system, experts say, which allows for therapies to be tested for the first time in humans through “investigator-initiated trials.” · These small-scale clinical trials generally undergo less oversight than the traditional approval pathway for a green light. Similar models exist in other countries and are seen as important to accelerating breakthroughs and administering life-saving treatments especially for rare diseases, where there is little commercial incentive for research. Even as results from related research were published in the Nature journal, the outcome was never made public by the doctors or their institutions. It was against this backdrop the Shanghai couple who shared their story with Science undertook a journey to get treatment for their young daughter. The girl had been diagnosed with a rare gene defect that produces a neurodevelopmental condition known as Snijders Blok-Campeau syndrome, Science reported. The disease can cause intellectual deficits as well as severe physical symptoms. While the girl showed symptoms that were milder than others, her parents decided to explore specialized gene therapy, according to Science. Qiu was known for research working with a cutting-edge technique known as base editing to make custom treatments for children with rare diseases. Under a treatment plan he developed for the family, the girl would be the first person in the world to receive a gene-editing therapy directed at the brain, according to Science.